Reverberation and photoionization estimates of the Broad Line Region Radius in Low-z Quasars
Black Hole Mass estimation in quasars, especially at high redshift, involves use of single epoch spectra with s/n and resolution that permit accurate measurement of the width of a broad line assumed to be a reliable virial estimator. Coupled with an estimate of the radius of the broad line region th...
| Autor: | |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2013 |
| País: | México |
| Institución: | Instituto Nacional de Astrofísica, Óptica y Electrónica |
| Repositorio: | Repositorio Institucional del INAOE |
| Idioma: | inglés |
| OAI Identifier: | oai:inaoe.repositorioinstitucional.mx:1009/2254 |
| Acceso en línea: | http://inaoe.repositorioinstitucional.mx/jspui/handle/1009/2254 |
| Access Level: | acceso abierto |
| Palabra clave: | info:eu-repo/classification/Inspec/Galaxies: active info:eu-repo/classification/Inspec/Quasars: general info:eu-repo/classification/Inspec/Quasars: emission lines info:eu-repo/classification/Inspec/Black holes: physics info:eu-repo/classification/cti/1 info:eu-repo/classification/cti/21 |
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Reverberation and photoionization estimates of the Broad Line Region Radius in Low-z QuasarsCASTALIA ALENKA NEGRETE PEÑALOZAinfo:eu-repo/classification/Inspec/Galaxies: activeinfo:eu-repo/classification/Inspec/Quasars: generalinfo:eu-repo/classification/Inspec/Quasars: emission linesinfo:eu-repo/classification/Inspec/Black holes: physicsinfo:eu-repo/classification/cti/1info:eu-repo/classification/cti/21info:eu-repo/classification/cti/21Black Hole Mass estimation in quasars, especially at high redshift, involves use of single epoch spectra with s/n and resolution that permit accurate measurement of the width of a broad line assumed to be a reliable virial estimator. Coupled with an estimate of the radius of the broad line region this yields MMB· The radius of the broad line region (BLR) may be inferred from an extrapolation of the correlation between source luminosity and reverberation derived rBLR measures (the so-called Kaspi relation involving about 60 low z sources). We are exploring a different method for estimating rBLR directly from inferred physical conditions in the BLR of each source. We report here on a comparison of rBLR estimates that come from our method and from reverberation mapping. Our “photoionization” method employs diagnostic line intensity ratios in the rest-frame range 1400-2000 Å (AlIIIλ1860/ SiIII]λ1892, Civλ1549/AlIIIλ1860) that enable derivation of the product of density and ionization parameter with the BLR distance derived from the definition of the ionization parameter. We find good agreement between our estimates of the density, ionization parameter and rBLR and those from reverberation mapping. We suggest empirical corrections to improve the agreement between individual photoionization-derived rBLR values and those obtained from reverberation mapping. The results in this paper can be exploited to estimate black hole masses MBH for large samples of high-z quasars using an appropriate virial broadening estimator. We show that the width of the UV intermediate emission lines are consistent with the width of Hβ, therefore providing a reliable virial broadening estimator that can be measured in large samples of high-z quasars.The Astrophysical Journal2013-05-20info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttp://inaoe.repositorioinstitucional.mx/jspui/handle/1009/2254reponame:Repositorio Institucional del INAOEinstname:Instituto Nacional de Astrofísica, Óptica y Electrónicainstacron:INAOEengcitation:Alenka Negrete, C., et al., (2013), Reverberation and photoionization estimates of the Broad Line Region Radius in Low-z Quasars, The Astrophysical Journal, Vol. 771(1):1-33info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-nd/4.0oai:inaoe.repositorioinstitucional.mx:1009/22542024-08-28T03:23:06Z |
| dc.title.none.fl_str_mv |
Reverberation and photoionization estimates of the Broad Line Region Radius in Low-z Quasars |
| title |
Reverberation and photoionization estimates of the Broad Line Region Radius in Low-z Quasars |
| spellingShingle |
Reverberation and photoionization estimates of the Broad Line Region Radius in Low-z Quasars CASTALIA ALENKA NEGRETE PEÑALOZA info:eu-repo/classification/Inspec/Galaxies: active info:eu-repo/classification/Inspec/Quasars: general info:eu-repo/classification/Inspec/Quasars: emission lines info:eu-repo/classification/Inspec/Black holes: physics info:eu-repo/classification/cti/1 info:eu-repo/classification/cti/21 info:eu-repo/classification/cti/21 |
| title_short |
Reverberation and photoionization estimates of the Broad Line Region Radius in Low-z Quasars |
| title_full |
Reverberation and photoionization estimates of the Broad Line Region Radius in Low-z Quasars |
| title_fullStr |
Reverberation and photoionization estimates of the Broad Line Region Radius in Low-z Quasars |
| title_full_unstemmed |
Reverberation and photoionization estimates of the Broad Line Region Radius in Low-z Quasars |
| title_sort |
Reverberation and photoionization estimates of the Broad Line Region Radius in Low-z Quasars |
| dc.creator.none.fl_str_mv |
CASTALIA ALENKA NEGRETE PEÑALOZA |
| author |
CASTALIA ALENKA NEGRETE PEÑALOZA |
| author_facet |
CASTALIA ALENKA NEGRETE PEÑALOZA |
| author_role |
author |
| dc.subject.none.fl_str_mv |
info:eu-repo/classification/Inspec/Galaxies: active info:eu-repo/classification/Inspec/Quasars: general info:eu-repo/classification/Inspec/Quasars: emission lines info:eu-repo/classification/Inspec/Black holes: physics info:eu-repo/classification/cti/1 info:eu-repo/classification/cti/21 info:eu-repo/classification/cti/21 |
| topic |
info:eu-repo/classification/Inspec/Galaxies: active info:eu-repo/classification/Inspec/Quasars: general info:eu-repo/classification/Inspec/Quasars: emission lines info:eu-repo/classification/Inspec/Black holes: physics info:eu-repo/classification/cti/1 info:eu-repo/classification/cti/21 info:eu-repo/classification/cti/21 |
| description |
Black Hole Mass estimation in quasars, especially at high redshift, involves use of single epoch spectra with s/n and resolution that permit accurate measurement of the width of a broad line assumed to be a reliable virial estimator. Coupled with an estimate of the radius of the broad line region this yields MMB· The radius of the broad line region (BLR) may be inferred from an extrapolation of the correlation between source luminosity and reverberation derived rBLR measures (the so-called Kaspi relation involving about 60 low z sources). We are exploring a different method for estimating rBLR directly from inferred physical conditions in the BLR of each source. We report here on a comparison of rBLR estimates that come from our method and from reverberation mapping. Our “photoionization” method employs diagnostic line intensity ratios in the rest-frame range 1400-2000 Å (AlIIIλ1860/ SiIII]λ1892, Civλ1549/AlIIIλ1860) that enable derivation of the product of density and ionization parameter with the BLR distance derived from the definition of the ionization parameter. We find good agreement between our estimates of the density, ionization parameter and rBLR and those from reverberation mapping. We suggest empirical corrections to improve the agreement between individual photoionization-derived rBLR values and those obtained from reverberation mapping. The results in this paper can be exploited to estimate black hole masses MBH for large samples of high-z quasars using an appropriate virial broadening estimator. We show that the width of the UV intermediate emission lines are consistent with the width of Hβ, therefore providing a reliable virial broadening estimator that can be measured in large samples of high-z quasars. |
| publishDate |
2013 |
| dc.date.none.fl_str_mv |
2013-05-20 |
| dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion |
| format |
article |
| status_str |
acceptedVersion |
| dc.identifier.none.fl_str_mv |
http://inaoe.repositorioinstitucional.mx/jspui/handle/1009/2254 |
| url |
http://inaoe.repositorioinstitucional.mx/jspui/handle/1009/2254 |
| dc.language.none.fl_str_mv |
eng |
| language |
eng |
| dc.relation.none.fl_str_mv |
citation:Alenka Negrete, C., et al., (2013), Reverberation and photoionization estimates of the Broad Line Region Radius in Low-z Quasars, The Astrophysical Journal, Vol. 771(1):1-33 |
| dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/4.0 |
| eu_rights_str_mv |
openAccess |
| rights_invalid_str_mv |
http://creativecommons.org/licenses/by-nc-nd/4.0 |
| dc.format.none.fl_str_mv |
application/pdf |
| dc.publisher.none.fl_str_mv |
The Astrophysical Journal |
| publisher.none.fl_str_mv |
The Astrophysical Journal |
| dc.source.none.fl_str_mv |
reponame:Repositorio Institucional del INAOE instname:Instituto Nacional de Astrofísica, Óptica y Electrónica instacron:INAOE |
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Instituto Nacional de Astrofísica, Óptica y Electrónica |
| instacron_str |
INAOE |
| institution |
INAOE |
| reponame_str |
Repositorio Institucional del INAOE |
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Repositorio Institucional del INAOE |
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15.811543 |