Suspended and Restored Activities of a Nearby Supermassive Black Hole
The discovery of spectral type transition of active galactic nuclei (AGNs), the so-called "changing-look" (CL) phenomenon, challenges the widely accepted AGN paradigm, not only in the orientation-based unified model, but also in the standard disk model. In past decades, only a couple of ne...
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| Veröffentlicht in: | The Astronomical journal 2020-06, Vol.159 (6), p.245 |
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| creator | Wang, J. Xu, D. W. Sun, S. S. Feng, Q. C. Li, T. R. Xiao, P. F. Wei, J. Y. |
| description | The discovery of spectral type transition of active galactic nuclei (AGNs), the so-called "changing-look" (CL) phenomenon, challenges the widely accepted AGN paradigm, not only in the orientation-based unified model, but also in the standard disk model. In past decades, only a couple of nearby repeat changing-look active galactic nuclei (CL-AGNs) have been identified. Here we report spectroscopic observations of UGC 3223 over the course of 18 yr, from 2001 onwards. Combining the spectrum taken in 1987 by Stirpe, we have witnessed its type transitions from over 32 yr, and captured a long-lived (at least 10 yr) thorough "turn-off" state with a spectrum typical of a Seyfert 2 galaxy. The long-term thorough turn-off state probably suggests a once-dormant and an awakening central engine in UGC 3223. We argue that the (dis)appearance of the broad Balmer emission lines can be explained by the disk-wind broad-line region model given the evolution of the calculated Eddington ratio of accretion of the supermassive black hole. |
| doi_str_mv | 10.3847/1538-3881/ab85cc |
| format | Article |
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W. ; Sun, S. S. ; Feng, Q. C. ; Li, T. R. ; Xiao, P. F. ; Wei, J. Y.</creator><creatorcontrib>Wang, J. ; Xu, D. W. ; Sun, S. S. ; Feng, Q. C. ; Li, T. R. ; Xiao, P. F. ; Wei, J. Y.</creatorcontrib><description>The discovery of spectral type transition of active galactic nuclei (AGNs), the so-called "changing-look" (CL) phenomenon, challenges the widely accepted AGN paradigm, not only in the orientation-based unified model, but also in the standard disk model. In past decades, only a couple of nearby repeat changing-look active galactic nuclei (CL-AGNs) have been identified. Here we report spectroscopic observations of UGC 3223 over the course of 18 yr, from 2001 onwards. Combining the spectrum taken in 1987 by Stirpe, we have witnessed its type transitions from over 32 yr, and captured a long-lived (at least 10 yr) thorough "turn-off" state with a spectrum typical of a Seyfert 2 galaxy. The long-term thorough turn-off state probably suggests a once-dormant and an awakening central engine in UGC 3223. We argue that the (dis)appearance of the broad Balmer emission lines can be explained by the disk-wind broad-line region model given the evolution of the calculated Eddington ratio of accretion of the supermassive black hole.</description><identifier>ISSN: 0004-6256</identifier><identifier>ISSN: 1538-3881</identifier><identifier>EISSN: 1538-3881</identifier><identifier>DOI: 10.3847/1538-3881/ab85cc</identifier><language>eng</language><publisher>Madison: The American Astronomical Society</publisher><subject>Active galactic nuclei ; Astronomy ; ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ; BALMER LINES ; BLACK HOLES ; Deposition ; EMISSION ; Emission line galaxies ; Emission lines ; GALAXIES ; GALAXY NUCLEI ; Seyfert galaxies ; SPECTRA ; Stellar winds ; Supermassive black holes ; UNIFIED MODEL</subject><ispartof>The Astronomical journal, 2020-06, Vol.159 (6), p.245</ispartof><rights>2020. The American Astronomical Society. 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Combining the spectrum taken in 1987 by Stirpe, we have witnessed its type transitions from over 32 yr, and captured a long-lived (at least 10 yr) thorough "turn-off" state with a spectrum typical of a Seyfert 2 galaxy. The long-term thorough turn-off state probably suggests a once-dormant and an awakening central engine in UGC 3223. We argue that the (dis)appearance of the broad Balmer emission lines can be explained by the disk-wind broad-line region model given the evolution of the calculated Eddington ratio of accretion of the supermassive black hole.</description><subject>Active galactic nuclei</subject><subject>Astronomy</subject><subject>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</subject><subject>BALMER LINES</subject><subject>BLACK HOLES</subject><subject>Deposition</subject><subject>EMISSION</subject><subject>Emission line galaxies</subject><subject>Emission lines</subject><subject>GALAXIES</subject><subject>GALAXY NUCLEI</subject><subject>Seyfert galaxies</subject><subject>SPECTRA</subject><subject>Stellar winds</subject><subject>Supermassive black holes</subject><subject>UNIFIED MODEL</subject><issn>0004-6256</issn><issn>1538-3881</issn><issn>1538-3881</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNp1kMtLw0AQhxdRsFbvHhf0aOzsI8nmWEt9QFGwel72VUxts3E3KfS_NyFiL3oaZvjmx8yH0CWBWyZ4PiEpEwkTgkyUFqkxR2j0OzpGIwDgSUbT7BSdxbgGIEQAH6H5so21q6yzWFUWv7rY-NA1U9OUu7IpXcR-hRV-diroPV62tQtbFWO5c_huo8wnfvQbd45OVmoT3cVPHaP3-_nb7DFZvDw8zaaLxHDIm4TaDDJWmCwnlOVAjS0M5UXGoSg0EdZoYExznROrQOci1YoRbrTNFQVjGRujqyHXx6aU0ZSNMx_GV5UzjaQMCKNEHKg6-K-2-0iufRuq7rCOKUQnIS16CgbKBB9jcCtZh3Krwl4SkL1S2fuTvT85KO1WroeV0teHTLXuyEJmkvJU1nbVYTd_YP-mfgO48IIj</recordid><startdate>20200601</startdate><enddate>20200601</enddate><creator>Wang, J.</creator><creator>Xu, D. 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Combining the spectrum taken in 1987 by Stirpe, we have witnessed its type transitions from over 32 yr, and captured a long-lived (at least 10 yr) thorough "turn-off" state with a spectrum typical of a Seyfert 2 galaxy. The long-term thorough turn-off state probably suggests a once-dormant and an awakening central engine in UGC 3223. We argue that the (dis)appearance of the broad Balmer emission lines can be explained by the disk-wind broad-line region model given the evolution of the calculated Eddington ratio of accretion of the supermassive black hole.</abstract><cop>Madison</cop><pub>The American Astronomical Society</pub><doi>10.3847/1538-3881/ab85cc</doi><tpages>7</tpages><orcidid>https://orcid.org/0000-0002-6880-4481</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Active galactic nuclei Astronomy ASTROPHYSICS, COSMOLOGY AND ASTRONOMY BALMER LINES BLACK HOLES Deposition EMISSION Emission line galaxies Emission lines GALAXIES GALAXY NUCLEI Seyfert galaxies SPECTRA Stellar winds Supermassive black holes UNIFIED MODEL |
| title | Suspended and Restored Activities of a Nearby Supermassive Black Hole |
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