A strong radio brightening at the jet base of M87 during the elevated very-high-energy [gamma]-ray state in 2012
Abstract The nearby radio galaxy M87 offers a unique opportunity for exploring the connection between γ-ray production and jet formation at an unprecedented linear resolution. However, the origin and location of the γ-rays in this source is still elusive. Based on previous radio/TeV correlation even...
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| Veröffentlicht in: | Proceedings of the International Astronomical Union 2014-09, Vol.10 (S313), p.340 |
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| creator | Hada, K Giroletti, M Kino, M Giovannini, G Ammando, F D' Cheung, C C Beilicke, M Nagai, H Doi, A Akiyama, K Honma, M Niinuma, K Casadio, C Orienti, M Krawczynski, H Gómez, J L Sawada-Satoh, S Koyama, S Cesarini, A Nakahara, S Gurwell, M A Massaro, F Lopez, E Siemiginowska, A |
| description | Abstract The nearby radio galaxy M87 offers a unique opportunity for exploring the connection between γ-ray production and jet formation at an unprecedented linear resolution. However, the origin and location of the γ-rays in this source is still elusive. Based on previous radio/TeV correlation events, the unresolved jet base (radio core) and the peculiar knot HST-1 at >120 pc from the nucleus are proposed as candidate site(s) of γ-ray production. Here we report our intensive, high-resolution radio monitoring observations of the M87 jet with the VLBI Exploration of Radio Astrometry (VERA) and the European VLBI Network (EVN) from February 2011 to October 2012. During this period, an elevated level of the M87 flux is reported at TeV with VERITAS. We detected a remarkable flux increase in the radio core with VERA at 22/43 GHz coincident with the VHE activity. Meanwhile, HST-1 remained quiescent in terms of its flux density and structure at radio. These results strongly suggest that the TeV γ-ray activity in 2012 originates in the jet base within 0.03 pc (projected) from the central supermassive black hole. |
| doi_str_mv | 10.1017/S174392131500246X |
| format | Article |
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However, the origin and location of the γ-rays in this source is still elusive. Based on previous radio/TeV correlation events, the unresolved jet base (radio core) and the peculiar knot HST-1 at >120 pc from the nucleus are proposed as candidate site(s) of γ-ray production. Here we report our intensive, high-resolution radio monitoring observations of the M87 jet with the VLBI Exploration of Radio Astrometry (VERA) and the European VLBI Network (EVN) from February 2011 to October 2012. During this period, an elevated level of the M87 flux is reported at TeV with VERITAS. We detected a remarkable flux increase in the radio core with VERA at 22/43 GHz coincident with the VHE activity. Meanwhile, HST-1 remained quiescent in terms of its flux density and structure at radio. These results strongly suggest that the TeV γ-ray activity in 2012 originates in the jet base within 0.03 pc (projected) from the central supermassive black hole.</description><identifier>ISSN: 1743-9213</identifier><identifier>EISSN: 1743-9221</identifier><identifier>DOI: 10.1017/S174392131500246X</identifier><language>eng</language><publisher>Cambridge: Cambridge University Press</publisher><subject>Astronomy ; Black holes ; Gamma ray astronomy ; Gamma rays ; Radio astronomy ; Stars & galaxies</subject><ispartof>Proceedings of the International Astronomical Union, 2014-09, Vol.10 (S313), p.340</ispartof><rights>Copyright © International Astronomical Union 2015</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids></links><search><creatorcontrib>Hada, K</creatorcontrib><creatorcontrib>Giroletti, M</creatorcontrib><creatorcontrib>Kino, M</creatorcontrib><creatorcontrib>Giovannini, G</creatorcontrib><creatorcontrib>Ammando, F D'</creatorcontrib><creatorcontrib>Cheung, C C</creatorcontrib><creatorcontrib>Beilicke, M</creatorcontrib><creatorcontrib>Nagai, H</creatorcontrib><creatorcontrib>Doi, A</creatorcontrib><creatorcontrib>Akiyama, K</creatorcontrib><creatorcontrib>Honma, M</creatorcontrib><creatorcontrib>Niinuma, K</creatorcontrib><creatorcontrib>Casadio, C</creatorcontrib><creatorcontrib>Orienti, M</creatorcontrib><creatorcontrib>Krawczynski, H</creatorcontrib><creatorcontrib>Gómez, J L</creatorcontrib><creatorcontrib>Sawada-Satoh, S</creatorcontrib><creatorcontrib>Koyama, S</creatorcontrib><creatorcontrib>Cesarini, A</creatorcontrib><creatorcontrib>Nakahara, S</creatorcontrib><creatorcontrib>Gurwell, M A</creatorcontrib><creatorcontrib>Massaro, F</creatorcontrib><creatorcontrib>Lopez, E</creatorcontrib><creatorcontrib>Siemiginowska, A</creatorcontrib><title>A strong radio brightening at the jet base of M87 during the elevated very-high-energy [gamma]-ray state in 2012</title><title>Proceedings of the International Astronomical Union</title><description>Abstract The nearby radio galaxy M87 offers a unique opportunity for exploring the connection between γ-ray production and jet formation at an unprecedented linear resolution. 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These results strongly suggest that the TeV γ-ray activity in 2012 originates in the jet base within 0.03 pc (projected) from the central supermassive black hole.</description><subject>Astronomy</subject><subject>Black holes</subject><subject>Gamma ray astronomy</subject><subject>Gamma rays</subject><subject>Radio astronomy</subject><subject>Stars & galaxies</subject><issn>1743-9213</issn><issn>1743-9221</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><recordid>eNqNjUtLBDEQhIMouD5-gLcGz9HuZB67RxHFiyc9CCJLlumdB7vJ2skszL83A-LZUxX1VVFK3RDeEVJ9_0Z1YVeGLJWIpqg-TtRijvTKGDr982TP1UWMA2JRLW25UIcHiEmCb0Fc0wfYSN92iX2fE5cgdQwDJ9i4yBC28LqsoRllpjPiHR9d4gaOLJPu8lSzZ2kn-Gzdfu--tLgpH-QO9B4MkrlSZ1u3i3z9q5fq9vnp_fFFHyR8jxzTegij-IzWVNWGsDQW7f9aP0UHTy0</recordid><startdate>20140901</startdate><enddate>20140901</enddate><creator>Hada, K</creator><creator>Giroletti, M</creator><creator>Kino, M</creator><creator>Giovannini, G</creator><creator>Ammando, F D'</creator><creator>Cheung, C C</creator><creator>Beilicke, M</creator><creator>Nagai, H</creator><creator>Doi, A</creator><creator>Akiyama, K</creator><creator>Honma, M</creator><creator>Niinuma, K</creator><creator>Casadio, C</creator><creator>Orienti, M</creator><creator>Krawczynski, H</creator><creator>Gómez, J L</creator><creator>Sawada-Satoh, S</creator><creator>Koyama, S</creator><creator>Cesarini, A</creator><creator>Nakahara, S</creator><creator>Gurwell, M A</creator><creator>Massaro, F</creator><creator>Lopez, E</creator><creator>Siemiginowska, A</creator><general>Cambridge University Press</general><scope>3V.</scope><scope>7XB</scope><scope>88I</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>8FK</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>ARAPS</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>GNUQQ</scope><scope>H8D</scope><scope>HCIFZ</scope><scope>L7M</scope><scope>M2P</scope><scope>P5Z</scope><scope>P62</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>Q9U</scope></search><sort><creationdate>20140901</creationdate><title>A strong radio brightening at the jet base of M87 during the elevated very-high-energy [gamma]-ray state in 2012</title><author>Hada, K ; 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However, the origin and location of the γ-rays in this source is still elusive. Based on previous radio/TeV correlation events, the unresolved jet base (radio core) and the peculiar knot HST-1 at >120 pc from the nucleus are proposed as candidate site(s) of γ-ray production. Here we report our intensive, high-resolution radio monitoring observations of the M87 jet with the VLBI Exploration of Radio Astrometry (VERA) and the European VLBI Network (EVN) from February 2011 to October 2012. During this period, an elevated level of the M87 flux is reported at TeV with VERITAS. We detected a remarkable flux increase in the radio core with VERA at 22/43 GHz coincident with the VHE activity. Meanwhile, HST-1 remained quiescent in terms of its flux density and structure at radio. These results strongly suggest that the TeV γ-ray activity in 2012 originates in the jet base within 0.03 pc (projected) from the central supermassive black hole.</abstract><cop>Cambridge</cop><pub>Cambridge University Press</pub><doi>10.1017/S174392131500246X</doi></addata></record> |
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| source | Cambridge University Press Journals Complete |
| subjects | Astronomy Black holes Gamma ray astronomy Gamma rays Radio astronomy Stars & galaxies |
| title | A strong radio brightening at the jet base of M87 during the elevated very-high-energy [gamma]-ray state in 2012 |
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