Spectroscopic Monitoring of Blazar S5 0716+714: Brightness-dependent Spectral Behavior
In this paper, we report new results of spectroscopic observations of γ-ray blazar S5 0716+714 from 2019 September to 2020 March with the 2.4 m optical telescope at Lijiang Observatory of Yunnan Observatories. The median cadence of observations is ∼1 day. During the second observation period (Epoch2...
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| Veröffentlicht in: | The Astrophysical journal 2020-10, Vol.902 (1), p.42 |
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| creator | Feng, Hai-Cheng Yang, Sen Yang, Zi-Xu Liu, H. T. Bai, J. M. Li, Sha-Sha Zhao, X. H. Zhang, Jin Li, Y. B. Xiao, M. Xin, Y. X. Xing, L. F. Lu, K. X. Xu, L. Wang, J. G. Wang, C. J. Zhang, X. L. Zhang, J. J. Lun, B. L. He, S. S. |
| description | In this paper, we report new results of spectroscopic observations of γ-ray blazar S5 0716+714 from 2019 September to 2020 March with the 2.4 m optical telescope at Lijiang Observatory of Yunnan Observatories. The median cadence of observations is ∼1 day. During the second observation period (Epoch2), the observational data reveal an extremely bright state and a bluer-when-brighter (BWB) chromatism. The BWB trend of Epoch2 differs significantly from that of the first observation period (Epoch1). A significantly brightness-dependent BWB chromatism emerges in the total data of Epoch1 and Epoch2. The BWB trend becomes weaker toward the brighter states, and likely becomes saturated at the highest state. Based on a log-parabolic function, a power law of synchrotron peak flux and frequency p, and a power law of the curvature of synchrotron spectrum and its p, simulation well reproduces the brightness-dependent BWB trend of S5 0716+714. The BWB trend is seemingly controlled by the shift of p with respect to the observational window, and effectively may be dominated by the variations of electron average energy and magnetic field in the emitting region. |
| doi_str_mv | 10.3847/1538-4357/abb366 |
| format | Article |
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T. ; Bai, J. M. ; Li, Sha-Sha ; Zhao, X. H. ; Zhang, Jin ; Li, Y. B. ; Xiao, M. ; Xin, Y. X. ; Xing, L. F. ; Lu, K. X. ; Xu, L. ; Wang, J. G. ; Wang, C. J. ; Zhang, X. L. ; Zhang, J. J. ; Lun, B. L. ; He, S. S.</creator><creatorcontrib>Feng, Hai-Cheng ; Yang, Sen ; Yang, Zi-Xu ; Liu, H. T. ; Bai, J. M. ; Li, Sha-Sha ; Zhao, X. H. ; Zhang, Jin ; Li, Y. B. ; Xiao, M. ; Xin, Y. X. ; Xing, L. F. ; Lu, K. X. ; Xu, L. ; Wang, J. G. ; Wang, C. J. ; Zhang, X. L. ; Zhang, J. J. ; Lun, B. L. ; He, S. S.</creatorcontrib><description>In this paper, we report new results of spectroscopic observations of γ-ray blazar S5 0716+714 from 2019 September to 2020 March with the 2.4 m optical telescope at Lijiang Observatory of Yunnan Observatories. The median cadence of observations is ∼1 day. During the second observation period (Epoch2), the observational data reveal an extremely bright state and a bluer-when-brighter (BWB) chromatism. The BWB trend of Epoch2 differs significantly from that of the first observation period (Epoch1). A significantly brightness-dependent BWB chromatism emerges in the total data of Epoch1 and Epoch2. The BWB trend becomes weaker toward the brighter states, and likely becomes saturated at the highest state. Based on a log-parabolic function, a power law of synchrotron peak flux and frequency p, and a power law of the curvature of synchrotron spectrum and its p, simulation well reproduces the brightness-dependent BWB trend of S5 0716+714. The BWB trend is seemingly controlled by the shift of p with respect to the observational window, and effectively may be dominated by the variations of electron average energy and magnetic field in the emitting region.</description><identifier>ISSN: 0004-637X</identifier><identifier>EISSN: 1538-4357</identifier><identifier>DOI: 10.3847/1538-4357/abb366</identifier><language>eng</language><publisher>Philadelphia: The American Astronomical Society</publisher><subject>Active galactic nuclei ; Astrophysics ; BL Lacertae objects ; Blazars ; Brightness ; Magnetic fields ; Observatories ; Power law ; Relativistic jets ; Spectroscopy ; Synchrotrons</subject><ispartof>The Astrophysical journal, 2020-10, Vol.902 (1), p.42</ispartof><rights>2020. The American Astronomical Society. All rights reserved.</rights><rights>Copyright IOP Publishing Oct 01, 2020</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c379t-46b9e9ff1a08c56683a923d4ef176b6c2f697455591114c94fc2c5d74b94ece53</citedby><cites>FETCH-LOGICAL-c379t-46b9e9ff1a08c56683a923d4ef176b6c2f697455591114c94fc2c5d74b94ece53</cites><orcidid>0000-0002-1530-2680</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://iopscience.iop.org/article/10.3847/1538-4357/abb366/pdf$$EPDF$$P50$$Giop$$H</linktopdf><link.rule.ids>314,780,784,27924,27925,38890,53867</link.rule.ids><linktorsrc>$$Uhttps://iopscience.iop.org/article/10.3847/1538-4357/abb366$$EView_record_in_IOP_Publishing$$FView_record_in_$$GIOP_Publishing</linktorsrc></links><search><creatorcontrib>Feng, Hai-Cheng</creatorcontrib><creatorcontrib>Yang, Sen</creatorcontrib><creatorcontrib>Yang, Zi-Xu</creatorcontrib><creatorcontrib>Liu, H. T.</creatorcontrib><creatorcontrib>Bai, J. M.</creatorcontrib><creatorcontrib>Li, Sha-Sha</creatorcontrib><creatorcontrib>Zhao, X. H.</creatorcontrib><creatorcontrib>Zhang, Jin</creatorcontrib><creatorcontrib>Li, Y. B.</creatorcontrib><creatorcontrib>Xiao, M.</creatorcontrib><creatorcontrib>Xin, Y. X.</creatorcontrib><creatorcontrib>Xing, L. F.</creatorcontrib><creatorcontrib>Lu, K. X.</creatorcontrib><creatorcontrib>Xu, L.</creatorcontrib><creatorcontrib>Wang, J. G.</creatorcontrib><creatorcontrib>Wang, C. J.</creatorcontrib><creatorcontrib>Zhang, X. L.</creatorcontrib><creatorcontrib>Zhang, J. J.</creatorcontrib><creatorcontrib>Lun, B. L.</creatorcontrib><creatorcontrib>He, S. S.</creatorcontrib><title>Spectroscopic Monitoring of Blazar S5 0716+714: Brightness-dependent Spectral Behavior</title><title>The Astrophysical journal</title><addtitle>APJ</addtitle><addtitle>Astrophys. J</addtitle><description>In this paper, we report new results of spectroscopic observations of γ-ray blazar S5 0716+714 from 2019 September to 2020 March with the 2.4 m optical telescope at Lijiang Observatory of Yunnan Observatories. The median cadence of observations is ∼1 day. During the second observation period (Epoch2), the observational data reveal an extremely bright state and a bluer-when-brighter (BWB) chromatism. The BWB trend of Epoch2 differs significantly from that of the first observation period (Epoch1). A significantly brightness-dependent BWB chromatism emerges in the total data of Epoch1 and Epoch2. The BWB trend becomes weaker toward the brighter states, and likely becomes saturated at the highest state. Based on a log-parabolic function, a power law of synchrotron peak flux and frequency p, and a power law of the curvature of synchrotron spectrum and its p, simulation well reproduces the brightness-dependent BWB trend of S5 0716+714. The BWB trend is seemingly controlled by the shift of p with respect to the observational window, and effectively may be dominated by the variations of electron average energy and magnetic field in the emitting region.</description><subject>Active galactic nuclei</subject><subject>Astrophysics</subject><subject>BL Lacertae objects</subject><subject>Blazars</subject><subject>Brightness</subject><subject>Magnetic fields</subject><subject>Observatories</subject><subject>Power law</subject><subject>Relativistic jets</subject><subject>Spectroscopy</subject><subject>Synchrotrons</subject><issn>0004-637X</issn><issn>1538-4357</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNp1kE1LxDAQhoMouK7ePRb0ptV8p_HmLn7BiodV8RbSNNntsjYx6Qr6622p6EVPwwzPPMO8ABwieEYKKs4RI0VOCRPnuiwJ51tg9DPaBiMIIc05ES-7YC-lVd9iKUfgeR6saaNPxofaZPe-qVsf62aReZdN1vpTx2zOMigQPxGIXmSTWC-WbWNTyisbbFPZps0GiV5nE7vU77WP-2DH6XWyB991DJ6urx6nt_ns4eZuejnLDRGyzSkvpZXOIQ0LwzgviJaYVNQ6JHjJDXZcCsoYkwghaiR1BhtWCVpKao1lZAyOBm-I_m1jU6tWfhOb7qTClEECsUSko-BAme7RFK1TIdavOn4oBFWfnuqjUn1UakivWzkeVmoffp06rJSEWCFFsQqV67DTP7B_rV9wkXts</recordid><startdate>20201001</startdate><enddate>20201001</enddate><creator>Feng, Hai-Cheng</creator><creator>Yang, Sen</creator><creator>Yang, Zi-Xu</creator><creator>Liu, H. 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M. ; Li, Sha-Sha ; Zhao, X. H. ; Zhang, Jin ; Li, Y. B. ; Xiao, M. ; Xin, Y. X. ; Xing, L. F. ; Lu, K. X. ; Xu, L. ; Wang, J. G. ; Wang, C. J. ; Zhang, X. L. ; Zhang, J. J. ; Lun, B. L. ; He, S. 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S.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Spectroscopic Monitoring of Blazar S5 0716+714: Brightness-dependent Spectral Behavior</atitle><jtitle>The Astrophysical journal</jtitle><stitle>APJ</stitle><addtitle>Astrophys. J</addtitle><date>2020-10-01</date><risdate>2020</risdate><volume>902</volume><issue>1</issue><spage>42</spage><pages>42-</pages><issn>0004-637X</issn><eissn>1538-4357</eissn><abstract>In this paper, we report new results of spectroscopic observations of γ-ray blazar S5 0716+714 from 2019 September to 2020 March with the 2.4 m optical telescope at Lijiang Observatory of Yunnan Observatories. The median cadence of observations is ∼1 day. During the second observation period (Epoch2), the observational data reveal an extremely bright state and a bluer-when-brighter (BWB) chromatism. The BWB trend of Epoch2 differs significantly from that of the first observation period (Epoch1). 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| subjects | Active galactic nuclei Astrophysics BL Lacertae objects Blazars Brightness Magnetic fields Observatories Power law Relativistic jets Spectroscopy Synchrotrons |
| title | Spectroscopic Monitoring of Blazar S5 0716+714: Brightness-dependent Spectral Behavior |
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