BASS. XXV. DR2 Broad-line-based Black Hole Mass Estimates and Biases from Obscuration

Julian E. Mejía-Restrepo; Benny Trakhtenbrot; Michael J. Koss; Kyuseok Oh; Jakob Den Brok; Daniel Stern; Meredith C. Powell; Federica Ricci; Turgay Caglar; Claudio Ricci; Franz E. Bauer; Ezequiel Treister; Fiona A. Harrison; C. M. Urry; Tonima Tasnim Ananna; Daniel Asmus; Roberto J. Assef; Rudolf E. Bär; Patricia S. Bessiere; Leonard Burtscher; Kohei Ichikawa; Darshan Kakkad; Nikita Kamraj; Richard Mushotzky; George C. Privon; Alejandra F. Rojas; Eleonora Sani; Kevin Schawinski; Sylvain Veilleux

doi:https://doi.org/10.3847/1538-4365/ac6602

BASS. XXV. DR2 Broad-line-based Black Hole Mass Estimates and Biases from Obscuration

Julian E. Mejía-Restrepo, Benny Trakhtenbrot, Michael J. Koss, Kyuseok Oh, Jakob Den Brok, Daniel Stern, Meredith C. Powell, Federica Ricci, Turgay Caglar, Claudio Ricci, Franz E. Bauer, Ezequiel Treister, Fiona A. Harrison, C. M. Urry, Tonima Tasnim Ananna, Daniel Asmus, Roberto J. Assef, Rudolf E. Bär, Patricia S. Bessiere, Leonard BurtscherKohei Ichikawa, Darshan Kakkad, Nikita Kamraj, Richard Mushotzky, George C. Privon, Alejandra F. Rojas, Eleonora Sani, Kevin Schawinski, Sylvain Veilleux

School of Physics and Astronomy

Tel Aviv University

Research output: Contribution to journal › Article › peer-review

Abstract

We present measurements of broad emission lines and virial estimates of supermassive black hole masses (M BH) for a large sample of ultrahard X-ray-selected active galactic nuclei (AGNs) as part of the second data release of the BAT AGN Spectroscopic Survey (BASS/DR2). Our catalog includes M BH estimates for a total of 689 AGNs, determined from the Hα, Hβ, Mg ii λ2798, and/or C iv λ1549 broad emission lines. The core sample includes a total of 512 AGNs drawn from the 70 month Swift/BAT all-sky catalog. We also provide measurements for 177 additional AGNs that are drawn from deeper Swift/BAT survey data. We study the links between M BH estimates and line-of-sight obscuration measured from X-ray spectral analysis. We find that broad Hα emission lines in obscured AGNs ( log(NH/cm-2)>22.0 ) are on average a factor of 8.0-2.4+4.1 weaker relative to ultrahard X-ray emission and about 35-12+7 % narrower than those in unobscured sources (i.e., log(NH/cm-2)<21.5 ). This indicates that the innermost part of the broad-line region is preferentially absorbed. Consequently, current single-epoch M BH prescriptions result in severely underestimated (>1 dex) masses for Type 1.9 sources (AGNs with broad Hα but no broad Hβ) and/or sources with log(NH/cm-2)≳22.0 . We provide simple multiplicative corrections for the observed luminosity and width of the broad Hα component (L[bHα] and FWHM[bHα]) in such sources to account for this effect and to (partially) remedy M BH estimates for Type 1.9 objects. As a key ingredient of BASS/DR2, our work provides the community with the data needed to further study powerful AGNs in the low-redshift universe.

Original language	English
Article number	5
Journal	Astrophysical Journal, Supplement Series
Volume	261
Issue number	1
DOIs	https://doi.org/10.3847/1538-4365/ac6602
State	Published - 1 Jul 2022

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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https://doi.org/10.3847/1538-4365/ac6602

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Mejía-Restrepo, J. E., Trakhtenbrot, B., Koss, M. J., Oh, K., Den Brok, J., Stern, D., Powell, M. C., Ricci, F., Caglar, T., Ricci, C., Bauer, F. E., Treister, E., Harrison, F. A., Urry, C. M., Ananna, T. T., Asmus, D., Assef, R. J., Bär, R. E., Bessiere, P. S., ... Veilleux, S. (2022). BASS. XXV. DR2 Broad-line-based Black Hole Mass Estimates and Biases from Obscuration. Astrophysical Journal, Supplement Series, 261(1), Article 5. https://doi.org/10.3847/1538-4365/ac6602

@article{9d86dc5248334f928ca2508dc2967f7f,

title = "BASS. XXV. DR2 Broad-line-based Black Hole Mass Estimates and Biases from Obscuration",

abstract = "We present measurements of broad emission lines and virial estimates of supermassive black hole masses (M BH) for a large sample of ultrahard X-ray-selected active galactic nuclei (AGNs) as part of the second data release of the BAT AGN Spectroscopic Survey (BASS/DR2). Our catalog includes M BH estimates for a total of 689 AGNs, determined from the Hα, Hβ, Mg ii λ2798, and/or C iv λ1549 broad emission lines. The core sample includes a total of 512 AGNs drawn from the 70 month Swift/BAT all-sky catalog. We also provide measurements for 177 additional AGNs that are drawn from deeper Swift/BAT survey data. We study the links between M BH estimates and line-of-sight obscuration measured from X-ray spectral analysis. We find that broad Hα emission lines in obscured AGNs ( log(NH/cm-2)>22.0 ) are on average a factor of 8.0-2.4+4.1 weaker relative to ultrahard X-ray emission and about 35-12+7 % narrower than those in unobscured sources (i.e., log(NH/cm-2)<21.5 ). This indicates that the innermost part of the broad-line region is preferentially absorbed. Consequently, current single-epoch M BH prescriptions result in severely underestimated (>1 dex) masses for Type 1.9 sources (AGNs with broad Hα but no broad Hβ) and/or sources with log(NH/cm-2)≳22.0 . We provide simple multiplicative corrections for the observed luminosity and width of the broad Hα component (L[bHα] and FWHM[bHα]) in such sources to account for this effect and to (partially) remedy M BH estimates for Type 1.9 objects. As a key ingredient of BASS/DR2, our work provides the community with the data needed to further study powerful AGNs in the low-redshift universe.",

author = "Mej{\'i}a-Restrepo, {Julian E.} and Benny Trakhtenbrot and Koss, {Michael J.} and Kyuseok Oh and {Den Brok}, Jakob and Daniel Stern and Powell, {Meredith C.} and Federica Ricci and Turgay Caglar and Claudio Ricci and Bauer, {Franz E.} and Ezequiel Treister and Harrison, {Fiona A.} and Urry, {C. M.} and Ananna, {Tonima Tasnim} and Daniel Asmus and Assef, {Roberto J.} and B{\"a}r, {Rudolf E.} and Bessiere, {Patricia S.} and Leonard Burtscher and Kohei Ichikawa and Darshan Kakkad and Nikita Kamraj and Richard Mushotzky and Privon, {George C.} and Rojas, {Alejandra F.} and Eleonora Sani and Kevin Schawinski and Sylvain Veilleux",

note = "Publisher Copyright: {\textcopyright} 2022. The Author(s). Published by the American Astronomical Society.",

year = "2022",

month = jul,

day = "1",

doi = "https://doi.org/10.3847/1538-4365/ac6602",

language = "الإنجليزيّة",

volume = "261",

journal = "Astrophysical Journal, Supplement Series",

issn = "0067-0049",

publisher = "IOP Publishing Ltd.",

number = "1",

}

Mejía-Restrepo, JE, Trakhtenbrot, B, Koss, MJ, Oh, K, Den Brok, J, Stern, D, Powell, MC, Ricci, F, Caglar, T, Ricci, C, Bauer, FE, Treister, E, Harrison, FA, Urry, CM, Ananna, TT, Asmus, D, Assef, RJ, Bär, RE, Bessiere, PS, Burtscher, L, Ichikawa, K, Kakkad, D, Kamraj, N, Mushotzky, R, Privon, GC, Rojas, AF, Sani, E, Schawinski, K & Veilleux, S 2022, 'BASS. XXV. DR2 Broad-line-based Black Hole Mass Estimates and Biases from Obscuration', Astrophysical Journal, Supplement Series, vol. 261, no. 1, 5. https://doi.org/10.3847/1538-4365/ac6602

TY - JOUR

T1 - BASS. XXV. DR2 Broad-line-based Black Hole Mass Estimates and Biases from Obscuration

AU - Mejía-Restrepo, Julian E.

AU - Trakhtenbrot, Benny

AU - Koss, Michael J.

AU - Oh, Kyuseok

AU - Den Brok, Jakob

AU - Stern, Daniel

AU - Powell, Meredith C.

AU - Ricci, Federica

AU - Caglar, Turgay

AU - Ricci, Claudio

AU - Bauer, Franz E.

AU - Treister, Ezequiel

AU - Harrison, Fiona A.

AU - Urry, C. M.

AU - Ananna, Tonima Tasnim

AU - Asmus, Daniel

AU - Assef, Roberto J.

AU - Bär, Rudolf E.

AU - Bessiere, Patricia S.

AU - Burtscher, Leonard

AU - Ichikawa, Kohei

AU - Kakkad, Darshan

AU - Kamraj, Nikita

AU - Mushotzky, Richard

AU - Privon, George C.

AU - Rojas, Alejandra F.

AU - Sani, Eleonora

AU - Schawinski, Kevin

AU - Veilleux, Sylvain

PY - 2022/7/1

Y1 - 2022/7/1

N2 - We present measurements of broad emission lines and virial estimates of supermassive black hole masses (M BH) for a large sample of ultrahard X-ray-selected active galactic nuclei (AGNs) as part of the second data release of the BAT AGN Spectroscopic Survey (BASS/DR2). Our catalog includes M BH estimates for a total of 689 AGNs, determined from the Hα, Hβ, Mg ii λ2798, and/or C iv λ1549 broad emission lines. The core sample includes a total of 512 AGNs drawn from the 70 month Swift/BAT all-sky catalog. We also provide measurements for 177 additional AGNs that are drawn from deeper Swift/BAT survey data. We study the links between M BH estimates and line-of-sight obscuration measured from X-ray spectral analysis. We find that broad Hα emission lines in obscured AGNs ( log(NH/cm-2)>22.0 ) are on average a factor of 8.0-2.4+4.1 weaker relative to ultrahard X-ray emission and about 35-12+7 % narrower than those in unobscured sources (i.e., log(NH/cm-2)<21.5 ). This indicates that the innermost part of the broad-line region is preferentially absorbed. Consequently, current single-epoch M BH prescriptions result in severely underestimated (>1 dex) masses for Type 1.9 sources (AGNs with broad Hα but no broad Hβ) and/or sources with log(NH/cm-2)≳22.0 . We provide simple multiplicative corrections for the observed luminosity and width of the broad Hα component (L[bHα] and FWHM[bHα]) in such sources to account for this effect and to (partially) remedy M BH estimates for Type 1.9 objects. As a key ingredient of BASS/DR2, our work provides the community with the data needed to further study powerful AGNs in the low-redshift universe.

AB - We present measurements of broad emission lines and virial estimates of supermassive black hole masses (M BH) for a large sample of ultrahard X-ray-selected active galactic nuclei (AGNs) as part of the second data release of the BAT AGN Spectroscopic Survey (BASS/DR2). Our catalog includes M BH estimates for a total of 689 AGNs, determined from the Hα, Hβ, Mg ii λ2798, and/or C iv λ1549 broad emission lines. The core sample includes a total of 512 AGNs drawn from the 70 month Swift/BAT all-sky catalog. We also provide measurements for 177 additional AGNs that are drawn from deeper Swift/BAT survey data. We study the links between M BH estimates and line-of-sight obscuration measured from X-ray spectral analysis. We find that broad Hα emission lines in obscured AGNs ( log(NH/cm-2)>22.0 ) are on average a factor of 8.0-2.4+4.1 weaker relative to ultrahard X-ray emission and about 35-12+7 % narrower than those in unobscured sources (i.e., log(NH/cm-2)<21.5 ). This indicates that the innermost part of the broad-line region is preferentially absorbed. Consequently, current single-epoch M BH prescriptions result in severely underestimated (>1 dex) masses for Type 1.9 sources (AGNs with broad Hα but no broad Hβ) and/or sources with log(NH/cm-2)≳22.0 . We provide simple multiplicative corrections for the observed luminosity and width of the broad Hα component (L[bHα] and FWHM[bHα]) in such sources to account for this effect and to (partially) remedy M BH estimates for Type 1.9 objects. As a key ingredient of BASS/DR2, our work provides the community with the data needed to further study powerful AGNs in the low-redshift universe.

UR - http://www.scopus.com/inward/record.url?scp=85134896151&partnerID=8YFLogxK

U2 - https://doi.org/10.3847/1538-4365/ac6602

DO - https://doi.org/10.3847/1538-4365/ac6602

M3 - مقالة

SN - 0067-0049

VL - 261

JO - Astrophysical Journal, Supplement Series

JF - Astrophysical Journal, Supplement Series

IS - 1

M1 - 5

ER -

BASS. XXV. DR2 Broad-line-based Black Hole Mass Estimates and Biases from Obscuration

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