Performance of the HAWC Observatory and TeV Gamma-Ray Measurements of the Crab Nebula with Improved Extensive Air Shower Reconstruction Algorithms
The High-Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory, located on the side of the Sierra Negra volcano in Mexico, has been fully operational since 2015. The HAWC collaboration has recently significantly improved their extensive air shower reconstruction algorithms, which has notably advance...
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| Veröffentlicht in: | The Astrophysical journal 2024-09, Vol.972 (2), p.144 |
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| creator | Albert, A. Alfaro, R. Alvarez, C. Andrés, A. Arteaga-Velázquez, J. C. Avila Rojas, D. Ayala Solares, H. A. Babu, R. Belmont-Moreno, E. Bernal, A. Caballero-Mora, K. S. Capistrán, T. Carramiñana, A. Carreón, F. Casanova, S. Cotti, U. Cotzomi, J. Coutiño de León, S. De la Fuente, E. de León, C. Depaoli, D. Di Lalla, N. Díaz Hernández, R. Dingus, B. L. DuVernois, M. A. Engel, K. Ergin, T. Espinoza, C. Fan, K. L. Fang, K. Fraija, N. Fraija, S. García-González, J. A. Garfias, F. Goksu, H. González, M. M. Goodman, J. A. Groetsch, S. Harding, J. P. Hernández-Cadena, S. Herzog, I. Hinton, J. Huang, D. Hueyotl-Zahuantitla, F. Hüntemeyer, P. Iriarte, A. Kaufmann, S. Lara, A. Lee, J. León Vargas, H. Linnemann, J. T. Longinotti, A. L. Luis-Raya, G. Malone, K. Martínez-Castro, J. Matthews, J. A. Miranda-Romagnoli, P. Montes, J. A. Moreno, E. Mostafá, M. Nellen, L. Nisa, M. U. Noriega-Papaqui, R. Olivera-Nieto, L. Omodei, N. Osorio-Archila, M. Pérez Araujo, Y. Pérez-Pérez, E. G. Rho, C. D. Rosa-González, D. Ruiz-Velasco, E. Salazar, H. Salazar-Gallegos, D. Sandoval, A. Schneider, M. Schwefer, G. Serna-Franco, J. Smith, A. J. Son, Y. Springer, R. W. Tibolla, O. Tollefson, K. Torres, I. Torres-Escobedo, R. Turner, R. Ureña-Mena, F. Varela, E. Wang, X. Watson, I. J. Whitaker, K. Willox, E. Wu, H. Yu, S. Yun-Cárcamo, S. Zhou, H. |
| description | The High-Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory, located on the side of the Sierra Negra volcano in Mexico, has been fully operational since 2015. The HAWC collaboration has recently significantly improved their extensive air shower reconstruction algorithms, which has notably advanced the observatory performance. The energy resolution for primary gamma rays with energies below 1 TeV was improved by including a noise-suppression algorithm. Corrections have also been made to systematic errors in direction fitting related to the detector and shower plane inclinations, O ( 0 .° 1 ) biases in highly inclined showers, and enhancements to the core reconstruction. The angular resolution for gamma rays approaching the HAWC array from large zenith angles (>37°) has improved by a factor of 4 at the highest energies (>70 TeV) as compared to previous reconstructions. The inclusion of a lateral distribution function fit to the extensive air shower footprint on the array to separate gamma-ray primaries from cosmic-ray ones based on the resulting χ 2 values improved the background rejection performance at all inclinations. At large zenith angles, the improvement in significance is a factor of 4 compared to previous HAWC publications. These enhancements have been verified by observing the Crab Nebula, which is an overhead source for the HAWC Observatory. We show that the sensitivity to Crab-like point sources ( E −2.63 ) with locations overhead to 30° zenith is comparable to or less than 10% of the Crab Nebula’s flux between 2 and 50 TeV. Thanks to these improvements, HAWC can now detect more sources, including the Galactic center. |
| doi_str_mv | 10.3847/1538-4357/ad5f2d |
| format | Article |
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C. ; Avila Rojas, D. ; Ayala Solares, H. A. ; Babu, R. ; Belmont-Moreno, E. ; Bernal, A. ; Caballero-Mora, K. S. ; Capistrán, T. ; Carramiñana, A. ; Carreón, F. ; Casanova, S. ; Cotti, U. ; Cotzomi, J. ; Coutiño de León, S. ; De la Fuente, E. ; de León, C. ; Depaoli, D. ; Di Lalla, N. ; Díaz Hernández, R. ; Dingus, B. L. ; DuVernois, M. A. ; Engel, K. ; Ergin, T. ; Espinoza, C. ; Fan, K. L. ; Fang, K. ; Fraija, N. ; Fraija, S. ; García-González, J. A. ; Garfias, F. ; Goksu, H. ; González, M. M. ; Goodman, J. A. ; Groetsch, S. ; Harding, J. P. ; Hernández-Cadena, S. ; Herzog, I. ; Hinton, J. ; Huang, D. ; Hueyotl-Zahuantitla, F. ; Hüntemeyer, P. ; Iriarte, A. ; Kaufmann, S. ; Lara, A. ; Lee, J. ; León Vargas, H. ; Linnemann, J. T. ; Longinotti, A. L. ; Luis-Raya, G. ; Malone, K. ; Martínez-Castro, J. ; Matthews, J. A. ; Miranda-Romagnoli, P. ; Montes, J. A. ; Moreno, E. ; Mostafá, M. ; Nellen, L. ; Nisa, M. U. ; Noriega-Papaqui, R. ; Olivera-Nieto, L. ; Omodei, N. ; Osorio-Archila, M. ; Pérez Araujo, Y. ; Pérez-Pérez, E. G. ; Rho, C. D. ; Rosa-González, D. ; Ruiz-Velasco, E. ; Salazar, H. ; Salazar-Gallegos, D. ; Sandoval, A. ; Schneider, M. ; Schwefer, G. ; Serna-Franco, J. ; Smith, A. J. ; Son, Y. ; Springer, R. W. ; Tibolla, O. ; Tollefson, K. ; Torres, I. ; Torres-Escobedo, R. ; Turner, R. ; Ureña-Mena, F. ; Varela, E. ; Wang, X. ; Watson, I. J. ; Whitaker, K. ; Willox, E. ; Wu, H. ; Yu, S. ; Yun-Cárcamo, S. ; Zhou, H.</creator><creatorcontrib>Albert, A. ; Alfaro, R. ; Alvarez, C. ; Andrés, A. ; Arteaga-Velázquez, J. C. ; Avila Rojas, D. ; Ayala Solares, H. A. ; Babu, R. ; Belmont-Moreno, E. ; Bernal, A. ; Caballero-Mora, K. S. ; Capistrán, T. ; Carramiñana, A. ; Carreón, F. ; Casanova, S. ; Cotti, U. ; Cotzomi, J. ; Coutiño de León, S. ; De la Fuente, E. ; de León, C. ; Depaoli, D. ; Di Lalla, N. ; Díaz Hernández, R. ; Dingus, B. L. ; DuVernois, M. A. ; Engel, K. ; Ergin, T. ; Espinoza, C. ; Fan, K. L. ; Fang, K. ; Fraija, N. ; Fraija, S. ; García-González, J. A. ; Garfias, F. ; Goksu, H. ; González, M. M. ; Goodman, J. A. ; Groetsch, S. ; Harding, J. P. ; Hernández-Cadena, S. ; Herzog, I. ; Hinton, J. ; Huang, D. ; Hueyotl-Zahuantitla, F. ; Hüntemeyer, P. ; Iriarte, A. ; Kaufmann, S. ; Lara, A. ; Lee, J. ; León Vargas, H. ; Linnemann, J. T. ; Longinotti, A. L. ; Luis-Raya, G. ; Malone, K. ; Martínez-Castro, J. ; Matthews, J. A. ; Miranda-Romagnoli, P. ; Montes, J. A. ; Moreno, E. ; Mostafá, M. ; Nellen, L. ; Nisa, M. U. ; Noriega-Papaqui, R. ; Olivera-Nieto, L. ; Omodei, N. ; Osorio-Archila, M. ; Pérez Araujo, Y. ; Pérez-Pérez, E. G. ; Rho, C. D. ; Rosa-González, D. ; Ruiz-Velasco, E. ; Salazar, H. ; Salazar-Gallegos, D. ; Sandoval, A. ; Schneider, M. ; Schwefer, G. ; Serna-Franco, J. ; Smith, A. J. ; Son, Y. ; Springer, R. W. ; Tibolla, O. ; Tollefson, K. ; Torres, I. ; Torres-Escobedo, R. ; Turner, R. ; Ureña-Mena, F. ; Varela, E. ; Wang, X. ; Watson, I. J. ; Whitaker, K. ; Willox, E. ; Wu, H. ; Yu, S. ; Yun-Cárcamo, S. ; Zhou, H. ; HAWC Collaboration</creatorcontrib><description>The High-Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory, located on the side of the Sierra Negra volcano in Mexico, has been fully operational since 2015. The HAWC collaboration has recently significantly improved their extensive air shower reconstruction algorithms, which has notably advanced the observatory performance. The energy resolution for primary gamma rays with energies below 1 TeV was improved by including a noise-suppression algorithm. Corrections have also been made to systematic errors in direction fitting related to the detector and shower plane inclinations, O ( 0 .° 1 ) biases in highly inclined showers, and enhancements to the core reconstruction. The angular resolution for gamma rays approaching the HAWC array from large zenith angles (>37°) has improved by a factor of 4 at the highest energies (>70 TeV) as compared to previous reconstructions. The inclusion of a lateral distribution function fit to the extensive air shower footprint on the array to separate gamma-ray primaries from cosmic-ray ones based on the resulting χ 2 values improved the background rejection performance at all inclinations. At large zenith angles, the improvement in significance is a factor of 4 compared to previous HAWC publications. These enhancements have been verified by observing the Crab Nebula, which is an overhead source for the HAWC Observatory. We show that the sensitivity to Crab-like point sources ( E −2.63 ) with locations overhead to 30° zenith is comparable to or less than 10% of the Crab Nebula’s flux between 2 and 50 TeV. Thanks to these improvements, HAWC can now detect more sources, including the Galactic center.</description><identifier>ISSN: 0004-637X</identifier><identifier>EISSN: 1538-4357</identifier><identifier>DOI: 10.3847/1538-4357/ad5f2d</identifier><language>eng</language><publisher>Philadelphia: The American Astronomical Society</publisher><subject>Algorithms ; Angular resolution ; Arrays ; Chi-square test ; Cosmic ray showers ; Crab nebula ; Distribution functions ; Energy resolution ; Gamma rays ; Gamma-ray detectors ; High altitude ; High energy astrophysics ; Observatories ; Point sources ; Reconstruction ; Statistical tests ; Systematic errors ; Volcanoes ; Zenith</subject><ispartof>The Astrophysical journal, 2024-09, Vol.972 (2), p.144</ispartof><rights>2024. The Author(s). Published by the American Astronomical Society.</rights><rights>2024. The Author(s). Published by the American Astronomical Society. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). 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J.</creatorcontrib><creatorcontrib>Son, Y.</creatorcontrib><creatorcontrib>Springer, R. W.</creatorcontrib><creatorcontrib>Tibolla, O.</creatorcontrib><creatorcontrib>Tollefson, K.</creatorcontrib><creatorcontrib>Torres, I.</creatorcontrib><creatorcontrib>Torres-Escobedo, R.</creatorcontrib><creatorcontrib>Turner, R.</creatorcontrib><creatorcontrib>Ureña-Mena, F.</creatorcontrib><creatorcontrib>Varela, E.</creatorcontrib><creatorcontrib>Wang, X.</creatorcontrib><creatorcontrib>Watson, I. J.</creatorcontrib><creatorcontrib>Whitaker, K.</creatorcontrib><creatorcontrib>Willox, E.</creatorcontrib><creatorcontrib>Wu, H.</creatorcontrib><creatorcontrib>Yu, S.</creatorcontrib><creatorcontrib>Yun-Cárcamo, S.</creatorcontrib><creatorcontrib>Zhou, H.</creatorcontrib><creatorcontrib>HAWC Collaboration</creatorcontrib><title>Performance of the HAWC Observatory and TeV Gamma-Ray Measurements of the Crab Nebula with Improved Extensive Air Shower Reconstruction Algorithms</title><title>The Astrophysical journal</title><addtitle>APJ</addtitle><addtitle>Astrophys. J</addtitle><description>The High-Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory, located on the side of the Sierra Negra volcano in Mexico, has been fully operational since 2015. The HAWC collaboration has recently significantly improved their extensive air shower reconstruction algorithms, which has notably advanced the observatory performance. The energy resolution for primary gamma rays with energies below 1 TeV was improved by including a noise-suppression algorithm. Corrections have also been made to systematic errors in direction fitting related to the detector and shower plane inclinations, O ( 0 .° 1 ) biases in highly inclined showers, and enhancements to the core reconstruction. The angular resolution for gamma rays approaching the HAWC array from large zenith angles (>37°) has improved by a factor of 4 at the highest energies (>70 TeV) as compared to previous reconstructions. The inclusion of a lateral distribution function fit to the extensive air shower footprint on the array to separate gamma-ray primaries from cosmic-ray ones based on the resulting χ 2 values improved the background rejection performance at all inclinations. At large zenith angles, the improvement in significance is a factor of 4 compared to previous HAWC publications. These enhancements have been verified by observing the Crab Nebula, which is an overhead source for the HAWC Observatory. We show that the sensitivity to Crab-like point sources ( E −2.63 ) with locations overhead to 30° zenith is comparable to or less than 10% of the Crab Nebula’s flux between 2 and 50 TeV. Thanks to these improvements, HAWC can now detect more sources, including the Galactic center.</description><subject>Algorithms</subject><subject>Angular resolution</subject><subject>Arrays</subject><subject>Chi-square test</subject><subject>Cosmic ray showers</subject><subject>Crab nebula</subject><subject>Distribution functions</subject><subject>Energy resolution</subject><subject>Gamma rays</subject><subject>Gamma-ray detectors</subject><subject>High altitude</subject><subject>High energy astrophysics</subject><subject>Observatories</subject><subject>Point sources</subject><subject>Reconstruction</subject><subject>Statistical tests</subject><subject>Systematic errors</subject><subject>Volcanoes</subject><subject>Zenith</subject><issn>0004-637X</issn><issn>1538-4357</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2024</creationdate><recordtype>article</recordtype><sourceid>O3W</sourceid><sourceid>DOA</sourceid><recordid>eNp1Uctu2zAQFIoWqJv03iOBXquEFB-SjoaRJgbSpEjTx41YkctYhiW6JOXUv5Evrhy1ySnYw2IHM7O7mCz7wOgJr0R5yiSvcsFleQpWusK-ymZP0OtsRikVueLlr7fZuxjXh7Go61n28BWD86GD3iDxjqQVkov5zwW5biKGHSQf9gR6S27xBzmHroP8BvbkC0IcAnbYp_hftgjQkCtshg2Q-zatyLLbBr9DS87-JOxju0MybwP5tvL3GMgNGt_HFAaTWt-T-ebOh1HVxePsjYNNxPf_-lH2_fPZ7eIiv7w-Xy7ml7kpZJnygkqLjFWFqJmhShqwtKTcVlhT0dRV45ireC2NEpVlBhVUBZdAy8IKw4TjR9ly8rUe1nob2g7CXnto9SPgw52GkFqzQe2UclKBMgKkcKZoBAArG6csEyUXfPT6OHmNH_8eMCa99kPox_M1Z5RKUY01sujEMsHHGNA9bWVUH1LUh8j0ITI9pThKPk2S1m-fPV-k_wXVtp8d</recordid><startdate>20240901</startdate><enddate>20240901</enddate><creator>Albert, A.</creator><creator>Alfaro, R.</creator><creator>Alvarez, C.</creator><creator>Andrés, A.</creator><creator>Arteaga-Velázquez, J. 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J.</creator><creator>Whitaker, K.</creator><creator>Willox, E.</creator><creator>Wu, H.</creator><creator>Yu, S.</creator><creator>Yun-Cárcamo, S.</creator><creator>Zhou, H.</creator><general>The American Astronomical Society</general><general>IOP Publishing</general><scope>O3W</scope><scope>TSCCA</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>8FD</scope><scope>H8D</scope><scope>KL.</scope><scope>L7M</scope><scope>DOA</scope><orcidid>https://orcid.org/0000-0002-9307-0133</orcidid></search><sort><creationdate>20240901</creationdate><title>Performance of the HAWC Observatory and TeV Gamma-Ray Measurements of the Crab Nebula with Improved Extensive Air Shower Reconstruction Algorithms</title><author>Albert, A. ; Alfaro, R. ; Alvarez, C. ; Andrés, A. ; Arteaga-Velázquez, J. C. ; Avila Rojas, D. ; Ayala Solares, H. A. ; Babu, R. ; Belmont-Moreno, E. ; Bernal, A. ; Caballero-Mora, K. S. ; Capistrán, T. ; Carramiñana, A. ; Carreón, F. ; Casanova, S. ; Cotti, U. ; Cotzomi, J. ; Coutiño de León, S. ; De la Fuente, E. ; de León, C. ; Depaoli, D. ; Di Lalla, N. ; Díaz Hernández, R. ; Dingus, B. L. ; DuVernois, M. A. ; Engel, K. ; Ergin, T. ; Espinoza, C. ; Fan, K. L. ; Fang, K. ; Fraija, N. ; Fraija, S. ; García-González, J. A. ; Garfias, F. ; Goksu, H. ; González, M. M. ; Goodman, J. A. ; Groetsch, S. ; Harding, J. P. ; Hernández-Cadena, S. ; Herzog, I. ; Hinton, J. ; Huang, D. ; Hueyotl-Zahuantitla, F. ; Hüntemeyer, P. ; Iriarte, A. ; Kaufmann, S. ; Lara, A. ; Lee, J. ; León Vargas, H. ; Linnemann, J. T. ; Longinotti, A. L. ; Luis-Raya, G. ; Malone, K. ; Martínez-Castro, J. ; Matthews, J. A. ; Miranda-Romagnoli, P. ; Montes, J. A. ; Moreno, E. ; Mostafá, M. ; Nellen, L. ; Nisa, M. U. ; Noriega-Papaqui, R. ; Olivera-Nieto, L. ; Omodei, N. ; Osorio-Archila, M. ; Pérez Araujo, Y. ; Pérez-Pérez, E. G. ; Rho, C. D. ; Rosa-González, D. ; Ruiz-Velasco, E. ; Salazar, H. ; Salazar-Gallegos, D. ; Sandoval, A. ; Schneider, M. ; Schwefer, G. ; Serna-Franco, J. ; Smith, A. J. ; Son, Y. ; Springer, R. W. ; Tibolla, O. ; Tollefson, K. ; Torres, I. ; Torres-Escobedo, R. ; Turner, R. ; Ureña-Mena, F. ; Varela, E. ; Wang, X. ; Watson, I. J. ; Whitaker, K. ; Willox, E. ; Wu, H. ; Yu, S. ; Yun-Cárcamo, S. ; Zhou, H.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c257t-205de1182491c065cad0703d8e904b98bf1f8395c648d1ce6a8235a072d4c14f3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2024</creationdate><topic>Algorithms</topic><topic>Angular resolution</topic><topic>Arrays</topic><topic>Chi-square test</topic><topic>Cosmic ray showers</topic><topic>Crab nebula</topic><topic>Distribution functions</topic><topic>Energy resolution</topic><topic>Gamma rays</topic><topic>Gamma-ray detectors</topic><topic>High altitude</topic><topic>High energy astrophysics</topic><topic>Observatories</topic><topic>Point sources</topic><topic>Reconstruction</topic><topic>Statistical tests</topic><topic>Systematic errors</topic><topic>Volcanoes</topic><topic>Zenith</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Albert, A.</creatorcontrib><creatorcontrib>Alfaro, R.</creatorcontrib><creatorcontrib>Alvarez, C.</creatorcontrib><creatorcontrib>Andrés, A.</creatorcontrib><creatorcontrib>Arteaga-Velázquez, J. 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J.</creatorcontrib><creatorcontrib>Son, Y.</creatorcontrib><creatorcontrib>Springer, R. W.</creatorcontrib><creatorcontrib>Tibolla, O.</creatorcontrib><creatorcontrib>Tollefson, K.</creatorcontrib><creatorcontrib>Torres, I.</creatorcontrib><creatorcontrib>Torres-Escobedo, R.</creatorcontrib><creatorcontrib>Turner, R.</creatorcontrib><creatorcontrib>Ureña-Mena, F.</creatorcontrib><creatorcontrib>Varela, E.</creatorcontrib><creatorcontrib>Wang, X.</creatorcontrib><creatorcontrib>Watson, I. J.</creatorcontrib><creatorcontrib>Whitaker, K.</creatorcontrib><creatorcontrib>Willox, E.</creatorcontrib><creatorcontrib>Wu, H.</creatorcontrib><creatorcontrib>Yu, S.</creatorcontrib><creatorcontrib>Yun-Cárcamo, S.</creatorcontrib><creatorcontrib>Zhou, H.</creatorcontrib><creatorcontrib>HAWC Collaboration</creatorcontrib><collection>IOP Publishing Free Content</collection><collection>IOPscience (Open Access)</collection><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>DOAJ Directory of Open Access Journals</collection><jtitle>The Astrophysical journal</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Albert, A.</au><au>Alfaro, R.</au><au>Alvarez, C.</au><au>Andrés, A.</au><au>Arteaga-Velázquez, J. C.</au><au>Avila Rojas, D.</au><au>Ayala Solares, H. A.</au><au>Babu, R.</au><au>Belmont-Moreno, E.</au><au>Bernal, A.</au><au>Caballero-Mora, K. S.</au><au>Capistrán, T.</au><au>Carramiñana, A.</au><au>Carreón, F.</au><au>Casanova, S.</au><au>Cotti, U.</au><au>Cotzomi, J.</au><au>Coutiño de León, S.</au><au>De la Fuente, E.</au><au>de León, C.</au><au>Depaoli, D.</au><au>Di Lalla, N.</au><au>Díaz Hernández, R.</au><au>Dingus, B. L.</au><au>DuVernois, M. A.</au><au>Engel, K.</au><au>Ergin, T.</au><au>Espinoza, C.</au><au>Fan, K. L.</au><au>Fang, K.</au><au>Fraija, N.</au><au>Fraija, S.</au><au>García-González, J. A.</au><au>Garfias, F.</au><au>Goksu, H.</au><au>González, M. M.</au><au>Goodman, J. A.</au><au>Groetsch, S.</au><au>Harding, J. P.</au><au>Hernández-Cadena, S.</au><au>Herzog, I.</au><au>Hinton, J.</au><au>Huang, D.</au><au>Hueyotl-Zahuantitla, F.</au><au>Hüntemeyer, P.</au><au>Iriarte, A.</au><au>Kaufmann, S.</au><au>Lara, A.</au><au>Lee, J.</au><au>León Vargas, H.</au><au>Linnemann, J. T.</au><au>Longinotti, A. L.</au><au>Luis-Raya, G.</au><au>Malone, K.</au><au>Martínez-Castro, J.</au><au>Matthews, J. A.</au><au>Miranda-Romagnoli, P.</au><au>Montes, J. A.</au><au>Moreno, E.</au><au>Mostafá, M.</au><au>Nellen, L.</au><au>Nisa, M. U.</au><au>Noriega-Papaqui, R.</au><au>Olivera-Nieto, L.</au><au>Omodei, N.</au><au>Osorio-Archila, M.</au><au>Pérez Araujo, Y.</au><au>Pérez-Pérez, E. G.</au><au>Rho, C. D.</au><au>Rosa-González, D.</au><au>Ruiz-Velasco, E.</au><au>Salazar, H.</au><au>Salazar-Gallegos, D.</au><au>Sandoval, A.</au><au>Schneider, M.</au><au>Schwefer, G.</au><au>Serna-Franco, J.</au><au>Smith, A. J.</au><au>Son, Y.</au><au>Springer, R. W.</au><au>Tibolla, O.</au><au>Tollefson, K.</au><au>Torres, I.</au><au>Torres-Escobedo, R.</au><au>Turner, R.</au><au>Ureña-Mena, F.</au><au>Varela, E.</au><au>Wang, X.</au><au>Watson, I. J.</au><au>Whitaker, K.</au><au>Willox, E.</au><au>Wu, H.</au><au>Yu, S.</au><au>Yun-Cárcamo, S.</au><au>Zhou, H.</au><aucorp>HAWC Collaboration</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Performance of the HAWC Observatory and TeV Gamma-Ray Measurements of the Crab Nebula with Improved Extensive Air Shower Reconstruction Algorithms</atitle><jtitle>The Astrophysical journal</jtitle><stitle>APJ</stitle><addtitle>Astrophys. J</addtitle><date>2024-09-01</date><risdate>2024</risdate><volume>972</volume><issue>2</issue><spage>144</spage><pages>144-</pages><issn>0004-637X</issn><eissn>1538-4357</eissn><abstract>The High-Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory, located on the side of the Sierra Negra volcano in Mexico, has been fully operational since 2015. The HAWC collaboration has recently significantly improved their extensive air shower reconstruction algorithms, which has notably advanced the observatory performance. The energy resolution for primary gamma rays with energies below 1 TeV was improved by including a noise-suppression algorithm. Corrections have also been made to systematic errors in direction fitting related to the detector and shower plane inclinations, O ( 0 .° 1 ) biases in highly inclined showers, and enhancements to the core reconstruction. The angular resolution for gamma rays approaching the HAWC array from large zenith angles (>37°) has improved by a factor of 4 at the highest energies (>70 TeV) as compared to previous reconstructions. The inclusion of a lateral distribution function fit to the extensive air shower footprint on the array to separate gamma-ray primaries from cosmic-ray ones based on the resulting χ 2 values improved the background rejection performance at all inclinations. At large zenith angles, the improvement in significance is a factor of 4 compared to previous HAWC publications. These enhancements have been verified by observing the Crab Nebula, which is an overhead source for the HAWC Observatory. We show that the sensitivity to Crab-like point sources ( E −2.63 ) with locations overhead to 30° zenith is comparable to or less than 10% of the Crab Nebula’s flux between 2 and 50 TeV. Thanks to these improvements, HAWC can now detect more sources, including the Galactic center.</abstract><cop>Philadelphia</cop><pub>The American Astronomical Society</pub><doi>10.3847/1538-4357/ad5f2d</doi><tpages>15</tpages><orcidid>https://orcid.org/0000-0002-9307-0133</orcidid><oa>free_for_read</oa></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0004-637X |
| ispartof | The Astrophysical journal, 2024-09, Vol.972 (2), p.144 |
| issn | 0004-637X 1538-4357 |
| language | eng |
| recordid | cdi_iop_journals_10_3847_1538_4357_ad5f2d |
| source | IOP Publishing Free Content; DOAJ Directory of Open Access Journals; EZB-FREE-00999 freely available EZB journals; Alma/SFX Local Collection |
| subjects | Algorithms Angular resolution Arrays Chi-square test Cosmic ray showers Crab nebula Distribution functions Energy resolution Gamma rays Gamma-ray detectors High altitude High energy astrophysics Observatories Point sources Reconstruction Statistical tests Systematic errors Volcanoes Zenith |
| title | Performance of the HAWC Observatory and TeV Gamma-Ray Measurements of the Crab Nebula with Improved Extensive Air Shower Reconstruction Algorithms |
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