High-quality Extragalactic Legacy-field Monitoring (HELM) with DECam
High-quality Extragalactic Legacy-field Monitoring (HELM) is a long-term observing program that photometrically monitors several well-studied extragalactic legacy fields with the Dark Energy Camera (DECam) imager on the CTIO 4m Blanco telescope. Since Feb 2019, HELM has been monitoring regions withi...
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| creator | Ming-Yang, Zhuang Yang, Qian Shen, Yue Adamow, Monika Friedel, Douglas N Gruendl, R A Liu, Xin Martini, Paul Abbott, Timothy M C Anderson, Scott F Assef, Roberto J Bauer, Franz E Bielby, Rich Brandt, W N Burke, Colin J Casares, Jorge Yu-Ching, Chen De Rosa, Gisella Drlica-Wagner, Alex Dwelly, Tom Eltvedt, Alice Gloria Fonseca Alvarez Fu, Jianyang Fuentes, Cesar Graham, Melissa L Grier, Catherine J Golovich, Nathan Hall, Patrick B Hartigan, Patrick Horne, Keith Koekemoer, Anton M Krumpe, Mirko Li, Jennifer I Lidman, Chris Malik, Umang Mangian, Amelia Merloni, Andrea Ricci, Claudio Salvato, Mara Sharp, Rob Stone, Zachary Trilling, David E Tucker, Brad E Wen, Di Wideman, Zachary Xue, Yongquan Yu, Zhefu Zucker, Catherine |
| description | High-quality Extragalactic Legacy-field Monitoring (HELM) is a long-term observing program that photometrically monitors several well-studied extragalactic legacy fields with the Dark Energy Camera (DECam) imager on the CTIO 4m Blanco telescope. Since Feb 2019, HELM has been monitoring regions within COSMOS, XMM-LSS, CDF-S, S-CVZ, ELAIS-S1, and SDSS Stripe 82 with few-day cadences in the \((u)gri(z)\) bands, over a collective sky area of \(\sim 38\) deg\({\rm ^2}\). The main science goal of HELM is to provide high-quality optical light curves for a large sample of active galactic nuclei (AGNs), and to build decades-long time baselines when combining past and future optical light curves in these legacy fields. These optical images and light curves will facilitate the measurements of AGN reverberation mapping lags, as well as studies of AGN variability and its dependences on accretion properties. In addition, the time-resolved and coadded DECam photometry will enable a broad range of science applications from galaxy evolution to time-domain science. We describe the design and implementation of the program and present the first data release that includes source catalogs and the first \(\sim 3.5\) years of light curves during 2019A--2022A. |
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A</au><au>Liu, Xin</au><au>Martini, Paul</au><au>Abbott, Timothy M C</au><au>Anderson, Scott F</au><au>Assef, Roberto J</au><au>Bauer, Franz E</au><au>Bielby, Rich</au><au>Brandt, W N</au><au>Burke, Colin J</au><au>Casares, Jorge</au><au>Yu-Ching, Chen</au><au>De Rosa, Gisella</au><au>Drlica-Wagner, Alex</au><au>Dwelly, Tom</au><au>Eltvedt, Alice</au><au>Gloria Fonseca Alvarez</au><au>Fu, Jianyang</au><au>Fuentes, Cesar</au><au>Graham, Melissa L</au><au>Grier, Catherine J</au><au>Golovich, Nathan</au><au>Hall, Patrick B</au><au>Hartigan, Patrick</au><au>Horne, Keith</au><au>Koekemoer, Anton M</au><au>Krumpe, Mirko</au><au>Li, Jennifer I</au><au>Lidman, Chris</au><au>Malik, Umang</au><au>Mangian, Amelia</au><au>Merloni, Andrea</au><au>Ricci, Claudio</au><au>Salvato, Mara</au><au>Sharp, Rob</au><au>Stone, Zachary</au><au>Trilling, David E</au><au>Tucker, Brad E</au><au>Wen, Di</au><au>Wideman, Zachary</au><au>Xue, Yongquan</au><au>Yu, Zhefu</au><au>Zucker, Catherine</au><format>book</format><genre>document</genre><ristype>GEN</ristype><atitle>High-quality Extragalactic Legacy-field Monitoring (HELM) with DECam</atitle><jtitle>arXiv.org</jtitle><date>2024-02-08</date><risdate>2024</risdate><eissn>2331-8422</eissn><abstract>High-quality Extragalactic Legacy-field Monitoring (HELM) is a long-term observing program that photometrically monitors several well-studied extragalactic legacy fields with the Dark Energy Camera (DECam) imager on the CTIO 4m Blanco telescope. Since Feb 2019, HELM has been monitoring regions within COSMOS, XMM-LSS, CDF-S, S-CVZ, ELAIS-S1, and SDSS Stripe 82 with few-day cadences in the \((u)gri(z)\) bands, over a collective sky area of \(\sim 38\) deg\({\rm ^2}\). The main science goal of HELM is to provide high-quality optical light curves for a large sample of active galactic nuclei (AGNs), and to build decades-long time baselines when combining past and future optical light curves in these legacy fields. These optical images and light curves will facilitate the measurements of AGN reverberation mapping lags, as well as studies of AGN variability and its dependences on accretion properties. In addition, the time-resolved and coadded DECam photometry will enable a broad range of science applications from galaxy evolution to time-domain science. We describe the design and implementation of the program and present the first data release that includes source catalogs and the first \(\sim 3.5\) years of light curves during 2019A--2022A.</abstract><cop>Ithaca</cop><pub>Cornell University Library, arXiv.org</pub><oa>free_for_read</oa></addata></record> |
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| subjects | Active galactic nuclei Dark energy Galactic evolution Light curve Monitoring Photometry |
| title | High-quality Extragalactic Legacy-field Monitoring (HELM) with DECam |
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