Space telescope and optical reverberation mapping project. IV. Anomalous behavior of the broad ultraviolet emission lines in NGC 5548
Autor(a) principal: | |
---|---|
Data de Publicação: | 2016 |
Outros Autores: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/150009 |
Resumo: | During an intensive Hubble Space Telescope (HST) Cosmic Origins Spectrograph (COS) UV monitoring campaign of the Seyfert 1 galaxy NGC 5548 performed from 2014 February to July, the normally highly correlated far UV continuum and broad emission line variations decorrelated for 60–70 days, starting 75 days after the first HST/ COS observation. Following this anomalous state, the flux and variability of the broad emission lines returned to a more normal state. This transient behavior, characterized by significant deficits in flux and equivalent width of the strong broad UV emission lines, is the first of its kind to be unambiguously identified in an active galactic nucleus reverberation mapping campaign. The largest corresponding emission line flux deficits occurred for the high ionization, collisionally excited lines C IV and Si IV(+O IV]), and also He II(+O III]), while the anomaly in Lyα was substantially smaller. This pattern of behavior indicates a depletion in the flux of photons with Eph > 54 eV relative to those near 13.6 eV. We suggest two plausible mechanisms for the observed behavior: (i) temporary obscuration of the ionizing continuum incident upon broad line region (BLR) clouds by a moving veil of material lying between the inner accretion disk and inner (BLR), perhaps resulting from an episodic ejection of material from the disk, or (ii) a temporary change in the intrinsic ionizing continuum spectral energy distribution resulting in a deficit of ionizing photons with energies >54 eV, possibly due to a transient restructuring of the Comptonizing atmosphere above the disk. Current evidence appears to favor the latter explanation. |
id |
UFRGS-2_da450a4d769de1d6181f002b0e8ca6b2 |
---|---|
oai_identifier_str |
oai:www.lume.ufrgs.br:10183/150009 |
network_acronym_str |
UFRGS-2 |
network_name_str |
Repositório Institucional da UFRGS |
repository_id_str |
|
spelling |
Goad, Michael R.Korista, Kirk T.De Rosa, GisellaKriss, Gerard A.Edelson, Rick A.Barth, Aaron J.Ferland, Gary J.Kochanek, C.S.Netzer, HagaiPeterson, Bradley M.Bentz, Misty CherieBisogni, S.Crenshaw, Daniel MichaelDenney, Kelly D.Ely, Justin C.Fausnaugh, MichaelGrier, Catherine J.Gupta, Anjali K.Horne, KeithKaastra, Jelle S.Pancoast, AnnaPei, LiuyiPogge, Richard WilliamSkielboe, AndreasStarkey, Donn R.Vestergaard, MarianneZu, YingAnderson, MattArévalo, PatriciaBazhaw, C.Borman, G. A.Boroson, ToddBottorff, MarkBrandt, W.N.Breeveld, Alice A.Brewer, Brendon J.Cackett, Edward M.Carini, MichaelCroxall, Kevin V.Dalla Bontà, ElenaDe Lorenzo-Cáceres, AdrianaDietrich, MatthiasEfimova, Natalia V.Evans, Phil A.Filippenko, Alexei V.Flatland, KelsiGehrels, Neil C.Geier, StephanGelbord, Jonathan M.Gonzalez, Luis A.Gorjian, VaroujanGrupe, DirkHall, Patrick B.Hicks, ShannonHorenstein, DanielHutchison, T.Im, MyungshinJensen, J. J.Joner, Michael D.Jones, Jeremy BrynKaspi, ShaiKelly, Brandon CharlesKennea, Jamie A.Kim, MinsunKim, Sang ChulKlimanov, S. A.Lee, Julia C.Leonard, Douglas C.Lira, PaulinaMacInnis, F.Manne-Nicholas, Emily R.Mathur, SmitaMchardy, Ian MichaelMontouri, C.Musso, R.Nazarov, S. V.Norris, Richard P.Nousek, John A.Okhmat, D. N.Papadakis, IossifParks, J. RobertPott, Jörg-UweRafter, Stephen E.Rix, H.-W.Saylor, Dicy A.Schimoia, Jáderson da SilvaSchnuelle, KirstenSergeev, Sergey G.Siegel, Michael H.Spencer, MeghinSung, Hyun-IlTeems, Katherine G.Treu, TommasoTurner, Clay S.Uttley, PhilVillforth, CarolinWeiss, Y.Woo, Jong-HakYan, H.Young, StuartZheng, WeiKang2016-12-07T02:26:40Z20160004-637Xhttp://hdl.handle.net/10183/150009001006323During an intensive Hubble Space Telescope (HST) Cosmic Origins Spectrograph (COS) UV monitoring campaign of the Seyfert 1 galaxy NGC 5548 performed from 2014 February to July, the normally highly correlated far UV continuum and broad emission line variations decorrelated for 60–70 days, starting 75 days after the first HST/ COS observation. Following this anomalous state, the flux and variability of the broad emission lines returned to a more normal state. This transient behavior, characterized by significant deficits in flux and equivalent width of the strong broad UV emission lines, is the first of its kind to be unambiguously identified in an active galactic nucleus reverberation mapping campaign. The largest corresponding emission line flux deficits occurred for the high ionization, collisionally excited lines C IV and Si IV(+O IV]), and also He II(+O III]), while the anomaly in Lyα was substantially smaller. This pattern of behavior indicates a depletion in the flux of photons with Eph > 54 eV relative to those near 13.6 eV. We suggest two plausible mechanisms for the observed behavior: (i) temporary obscuration of the ionizing continuum incident upon broad line region (BLR) clouds by a moving veil of material lying between the inner accretion disk and inner (BLR), perhaps resulting from an episodic ejection of material from the disk, or (ii) a temporary change in the intrinsic ionizing continuum spectral energy distribution resulting in a deficit of ionizing photons with energies >54 eV, possibly due to a transient restructuring of the Comptonizing atmosphere above the disk. Current evidence appears to favor the latter explanation.application/pdfengThe astrophysical journal. Bristol. Vol. 824, no. 1 (June 2016), 11, 10 p.Galáxias ativasGaláxia NGC 5548Galaxias seyfertNucleo galaticoGalaxies: activeGalaxies: individual (NGC – 5548)Galaxies: nucleiGalaxies: Seyfert Supporting material: animationSpace telescope and optical reverberation mapping project. IV. Anomalous behavior of the broad ultraviolet emission lines in NGC 5548Estrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL001006323.pdf001006323.pdfTexto completo (inglês)application/pdf402205http://www.lume.ufrgs.br/bitstream/10183/150009/1/001006323.pdfdfadac6e4a2c2a440dbd4fe30544c9cfMD51TEXT001006323.pdf.txt001006323.pdf.txtExtracted Texttext/plain53911http://www.lume.ufrgs.br/bitstream/10183/150009/2/001006323.pdf.txt86ae46646885b290c8a42e0046175e26MD52THUMBNAIL001006323.pdf.jpg001006323.pdf.jpgGenerated Thumbnailimage/jpeg1940http://www.lume.ufrgs.br/bitstream/10183/150009/3/001006323.pdf.jpg38a8f1ea043f31ca994468d952ab5521MD5310183/1500092018-10-29 09:27:57.662oai:www.lume.ufrgs.br:10183/150009Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2018-10-29T12:27:57Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Space telescope and optical reverberation mapping project. IV. Anomalous behavior of the broad ultraviolet emission lines in NGC 5548 |
title |
Space telescope and optical reverberation mapping project. IV. Anomalous behavior of the broad ultraviolet emission lines in NGC 5548 |
spellingShingle |
Space telescope and optical reverberation mapping project. IV. Anomalous behavior of the broad ultraviolet emission lines in NGC 5548 Goad, Michael R. Galáxias ativas Galáxia NGC 5548 Galaxias seyfert Nucleo galatico Galaxies: active Galaxies: individual (NGC – 5548) Galaxies: nuclei Galaxies: Seyfert Supporting material: animation |
title_short |
Space telescope and optical reverberation mapping project. IV. Anomalous behavior of the broad ultraviolet emission lines in NGC 5548 |
title_full |
Space telescope and optical reverberation mapping project. IV. Anomalous behavior of the broad ultraviolet emission lines in NGC 5548 |
title_fullStr |
Space telescope and optical reverberation mapping project. IV. Anomalous behavior of the broad ultraviolet emission lines in NGC 5548 |
title_full_unstemmed |
Space telescope and optical reverberation mapping project. IV. Anomalous behavior of the broad ultraviolet emission lines in NGC 5548 |
title_sort |
Space telescope and optical reverberation mapping project. IV. Anomalous behavior of the broad ultraviolet emission lines in NGC 5548 |
author |
Goad, Michael R. |
author_facet |
Goad, Michael R. Korista, Kirk T. De Rosa, Gisella Kriss, Gerard A. Edelson, Rick A. Barth, Aaron J. Ferland, Gary J. Kochanek, C.S. Netzer, Hagai Peterson, Bradley M. Bentz, Misty Cherie Bisogni, S. Crenshaw, Daniel Michael Denney, Kelly D. Ely, Justin C. Fausnaugh, Michael Grier, Catherine J. Gupta, Anjali K. Horne, Keith Kaastra, Jelle S. Pancoast, Anna Pei, Liuyi Pogge, Richard William Skielboe, Andreas Starkey, Donn R. Vestergaard, Marianne Zu, Ying Anderson, Matt Arévalo, Patricia Bazhaw, C. Borman, G. A. Boroson, Todd Bottorff, Mark Brandt, W.N. Breeveld, Alice A. Brewer, Brendon J. Cackett, Edward M. Carini, Michael Croxall, Kevin V. Dalla Bontà, Elena De Lorenzo-Cáceres, Adriana Dietrich, Matthias Efimova, Natalia V. Evans, Phil A. Filippenko, Alexei V. Flatland, Kelsi Gehrels, Neil C. Geier, Stephan Gelbord, Jonathan M. Gonzalez, Luis A. Gorjian, Varoujan Grupe, Dirk Hall, Patrick B. Hicks, Shannon Horenstein, Daniel Hutchison, T. Im, Myungshin Jensen, J. J. Joner, Michael D. Jones, Jeremy Bryn Kaspi, Shai Kelly, Brandon Charles Kennea, Jamie A. Kim, Minsun Kim, Sang Chul Klimanov, S. A. Lee, Julia C. Leonard, Douglas C. Lira, Paulina MacInnis, F. Manne-Nicholas, Emily R. Mathur, Smita Mchardy, Ian Michael Montouri, C. Musso, R. Nazarov, S. V. Norris, Richard P. Nousek, John A. Okhmat, D. N. Papadakis, Iossif Parks, J. Robert Pott, Jörg-Uwe Rafter, Stephen E. Rix, H.-W. Saylor, Dicy A. Schimoia, Jáderson da Silva Schnuelle, Kirsten Sergeev, Sergey G. Siegel, Michael H. Spencer, Meghin Sung, Hyun-Il Teems, Katherine G. Treu, Tommaso Turner, Clay S. Uttley, Phil Villforth, Carolin Weiss, Y. Woo, Jong-Hak Yan, H. Young, Stuart Zheng, WeiKang |
author_role |
author |
author2 |
Korista, Kirk T. De Rosa, Gisella Kriss, Gerard A. Edelson, Rick A. Barth, Aaron J. Ferland, Gary J. Kochanek, C.S. Netzer, Hagai Peterson, Bradley M. Bentz, Misty Cherie Bisogni, S. Crenshaw, Daniel Michael Denney, Kelly D. Ely, Justin C. Fausnaugh, Michael Grier, Catherine J. Gupta, Anjali K. Horne, Keith Kaastra, Jelle S. Pancoast, Anna Pei, Liuyi Pogge, Richard William Skielboe, Andreas Starkey, Donn R. Vestergaard, Marianne Zu, Ying Anderson, Matt Arévalo, Patricia Bazhaw, C. Borman, G. A. Boroson, Todd Bottorff, Mark Brandt, W.N. Breeveld, Alice A. Brewer, Brendon J. Cackett, Edward M. Carini, Michael Croxall, Kevin V. Dalla Bontà, Elena De Lorenzo-Cáceres, Adriana Dietrich, Matthias Efimova, Natalia V. Evans, Phil A. Filippenko, Alexei V. Flatland, Kelsi Gehrels, Neil C. Geier, Stephan Gelbord, Jonathan M. Gonzalez, Luis A. Gorjian, Varoujan Grupe, Dirk Hall, Patrick B. Hicks, Shannon Horenstein, Daniel Hutchison, T. Im, Myungshin Jensen, J. J. Joner, Michael D. Jones, Jeremy Bryn Kaspi, Shai Kelly, Brandon Charles Kennea, Jamie A. Kim, Minsun Kim, Sang Chul Klimanov, S. A. Lee, Julia C. Leonard, Douglas C. Lira, Paulina MacInnis, F. Manne-Nicholas, Emily R. Mathur, Smita Mchardy, Ian Michael Montouri, C. Musso, R. Nazarov, S. V. Norris, Richard P. Nousek, John A. Okhmat, D. N. Papadakis, Iossif Parks, J. Robert Pott, Jörg-Uwe Rafter, Stephen E. Rix, H.-W. Saylor, Dicy A. Schimoia, Jáderson da Silva Schnuelle, Kirsten Sergeev, Sergey G. Siegel, Michael H. Spencer, Meghin Sung, Hyun-Il Teems, Katherine G. Treu, Tommaso Turner, Clay S. Uttley, Phil Villforth, Carolin Weiss, Y. Woo, Jong-Hak Yan, H. Young, Stuart Zheng, WeiKang |
author2_role |
author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author |
dc.contributor.author.fl_str_mv |
Goad, Michael R. Korista, Kirk T. De Rosa, Gisella Kriss, Gerard A. Edelson, Rick A. Barth, Aaron J. Ferland, Gary J. Kochanek, C.S. Netzer, Hagai Peterson, Bradley M. Bentz, Misty Cherie Bisogni, S. Crenshaw, Daniel Michael Denney, Kelly D. Ely, Justin C. Fausnaugh, Michael Grier, Catherine J. Gupta, Anjali K. Horne, Keith Kaastra, Jelle S. Pancoast, Anna Pei, Liuyi Pogge, Richard William Skielboe, Andreas Starkey, Donn R. Vestergaard, Marianne Zu, Ying Anderson, Matt Arévalo, Patricia Bazhaw, C. Borman, G. A. Boroson, Todd Bottorff, Mark Brandt, W.N. Breeveld, Alice A. Brewer, Brendon J. Cackett, Edward M. Carini, Michael Croxall, Kevin V. Dalla Bontà, Elena De Lorenzo-Cáceres, Adriana Dietrich, Matthias Efimova, Natalia V. Evans, Phil A. Filippenko, Alexei V. Flatland, Kelsi Gehrels, Neil C. Geier, Stephan Gelbord, Jonathan M. Gonzalez, Luis A. Gorjian, Varoujan Grupe, Dirk Hall, Patrick B. Hicks, Shannon Horenstein, Daniel Hutchison, T. Im, Myungshin Jensen, J. J. Joner, Michael D. Jones, Jeremy Bryn Kaspi, Shai Kelly, Brandon Charles Kennea, Jamie A. Kim, Minsun Kim, Sang Chul Klimanov, S. A. Lee, Julia C. Leonard, Douglas C. Lira, Paulina MacInnis, F. Manne-Nicholas, Emily R. Mathur, Smita Mchardy, Ian Michael Montouri, C. Musso, R. Nazarov, S. V. Norris, Richard P. Nousek, John A. Okhmat, D. N. Papadakis, Iossif Parks, J. Robert Pott, Jörg-Uwe Rafter, Stephen E. Rix, H.-W. Saylor, Dicy A. Schimoia, Jáderson da Silva Schnuelle, Kirsten Sergeev, Sergey G. Siegel, Michael H. Spencer, Meghin Sung, Hyun-Il Teems, Katherine G. Treu, Tommaso Turner, Clay S. Uttley, Phil Villforth, Carolin Weiss, Y. Woo, Jong-Hak Yan, H. Young, Stuart Zheng, WeiKang |
dc.subject.por.fl_str_mv |
Galáxias ativas Galáxia NGC 5548 Galaxias seyfert Nucleo galatico |
topic |
Galáxias ativas Galáxia NGC 5548 Galaxias seyfert Nucleo galatico Galaxies: active Galaxies: individual (NGC – 5548) Galaxies: nuclei Galaxies: Seyfert Supporting material: animation |
dc.subject.eng.fl_str_mv |
Galaxies: active Galaxies: individual (NGC – 5548) Galaxies: nuclei Galaxies: Seyfert Supporting material: animation |
description |
During an intensive Hubble Space Telescope (HST) Cosmic Origins Spectrograph (COS) UV monitoring campaign of the Seyfert 1 galaxy NGC 5548 performed from 2014 February to July, the normally highly correlated far UV continuum and broad emission line variations decorrelated for 60–70 days, starting 75 days after the first HST/ COS observation. Following this anomalous state, the flux and variability of the broad emission lines returned to a more normal state. This transient behavior, characterized by significant deficits in flux and equivalent width of the strong broad UV emission lines, is the first of its kind to be unambiguously identified in an active galactic nucleus reverberation mapping campaign. The largest corresponding emission line flux deficits occurred for the high ionization, collisionally excited lines C IV and Si IV(+O IV]), and also He II(+O III]), while the anomaly in Lyα was substantially smaller. This pattern of behavior indicates a depletion in the flux of photons with Eph > 54 eV relative to those near 13.6 eV. We suggest two plausible mechanisms for the observed behavior: (i) temporary obscuration of the ionizing continuum incident upon broad line region (BLR) clouds by a moving veil of material lying between the inner accretion disk and inner (BLR), perhaps resulting from an episodic ejection of material from the disk, or (ii) a temporary change in the intrinsic ionizing continuum spectral energy distribution resulting in a deficit of ionizing photons with energies >54 eV, possibly due to a transient restructuring of the Comptonizing atmosphere above the disk. Current evidence appears to favor the latter explanation. |
publishDate |
2016 |
dc.date.accessioned.fl_str_mv |
2016-12-07T02:26:40Z |
dc.date.issued.fl_str_mv |
2016 |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/150009 |
dc.identifier.issn.pt_BR.fl_str_mv |
0004-637X |
dc.identifier.nrb.pt_BR.fl_str_mv |
001006323 |
identifier_str_mv |
0004-637X 001006323 |
url |
http://hdl.handle.net/10183/150009 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
The astrophysical journal. Bristol. Vol. 824, no. 1 (June 2016), 11, 10 p. |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da UFRGS instname:Universidade Federal do Rio Grande do Sul (UFRGS) instacron:UFRGS |
instname_str |
Universidade Federal do Rio Grande do Sul (UFRGS) |
instacron_str |
UFRGS |
institution |
UFRGS |
reponame_str |
Repositório Institucional da UFRGS |
collection |
Repositório Institucional da UFRGS |
bitstream.url.fl_str_mv |
http://www.lume.ufrgs.br/bitstream/10183/150009/1/001006323.pdf http://www.lume.ufrgs.br/bitstream/10183/150009/2/001006323.pdf.txt http://www.lume.ufrgs.br/bitstream/10183/150009/3/001006323.pdf.jpg |
bitstream.checksum.fl_str_mv |
dfadac6e4a2c2a440dbd4fe30544c9cf 86ae46646885b290c8a42e0046175e26 38a8f1ea043f31ca994468d952ab5521 |
bitstream.checksumAlgorithm.fl_str_mv |
MD5 MD5 MD5 |
repository.name.fl_str_mv |
Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS) |
repository.mail.fl_str_mv |
|
_version_ |
1798487334957613056 |