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BASS. XXIX. The Near-infrared View of the Broad-line Region (BLR): The Effects of Obscuration in BLR Characterization

Journal Article · · The Astrophysical Journal. Supplement Series
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [10];  [11];  [12];  [4];  [13];  [14];  [15];  [16];  [17];  [18];  [19] more »;  [20];  [4];  [16];  [11];  [21];  [22];  [14] « less
  1. Pontificia Univ. Católica de Chile, Santiago (Chile); Univ. of Bologna (Italy); INAF—Osservatorio di Astrofisica e Scienza dello Spazio di Bologna (Italy); Univ. Roma Tre (Italy); SLAC
  2. Pontificia Univ. Católica de Chile, Santiago (Chile)
  3. Pontificia Univ. Católica de Chile, Santiago (Chile); Millennium Inst. of Astrophysics (MAS), Santiago (Chile); Space Science Inst., Boulder, CO (United States)
  4. European Southern Observatory, Santiago de Chile (Chile)
  5. Eureka Scientific, Oakland, CA (United States)
  6. ETH Zurich (Switzerland); Argelander Inst. for Astronomy, Bonn (Germany)
  7. Harvard & Smithsonian, Cambridge, MA (United States); Harvard Univ., Cambridge, MA (United States); Yale Center for Astronomy & Astrophysics, New Haven, CT (United States)
  8. ETH Zurich (Switzerland)
  9. Inst. de Astrofísica de Canarias, Tenerife (Spain)
  10. Leiden Observatory (The Netherlands)
  11. California Institute of Technology (CalTech), Pasadena, CA (United States)
  12. Tohoku Univ., Sendai (Japan)
  13. Univ. College London (United Kingdom); European Southern Observatory, Munchen (Germany); Centro de Astrobiología (CAB), Madrid (Spain)
  14. Univ. of Maryland, College Park, MD (United States)
  15. Korean Astronomy & Space Science Inst., Daejeon (Korean, Republic of); Kyoto Univ. (Japan)
  16. Stanford Univ., CA (United States)
  17. Univ. of Florida, Gainesville, FL (United States); National Radio Astronomy Observatory, Charlottesville, VA (United States)
  18. Univ. Diego Portales, Santiago (Chile); Peking Univ., Beijing (China); George Mason Univ., Fairfax, VA (United States)
  19. Univ. Federal do Rio Grande do Sul Porto Alegre (Brazil)
  20. Univ. de Antofagasta (Chile)
  21. Tel Aviv Univ., Tel Aviv (Israel)
  22. Yale Center for Astronomy & Astrophysics, New Haven, CT (United States)
+ Show Author Affiliations
Virial black hole (BH) mass (MBH) determination directly involves knowing the broad-line region (BLR) clouds' velocity distribution, their distance from the central supermassive BH (RBLR), and the virial factor (f). Understanding whether biases arise in MBH estimation with increasing obscuration is possible only by studying a large (N > 100) statistical sample of obscuration-unbiased (hard) X-ray-selected active galactic nuclei (AGNs) in the rest-frame near-infrared (0.8–2.5 μm) since it penetrates deeper into the BLR than the optical. We present a detailed analysis of 65 local Burst Alert Telescope (BAT) selected Seyfert galaxies observed with Magellan/FIRE. Adding these to the near-infrared BAT AGN spectroscopic survey database, we study a total of 314 unique near-infrared spectra. While the FWHMs of Hα and near-infrared broad lines (He i, Paβ, Paα) remain unbiased to either BLR extinction or X-ray obscuration, the Hα broad-line luminosity is suppressed when NH ≳ 1021 cm–2, systematically underestimating MBH by 0.23–0.46 dex. Near-infrared line luminosities should be preferred to Hα until NH < 1022 cm–2, while at higher obscuration a less-biased RBLR proxy should be adopted. We estimate f for Seyfert 1 and 2 using two obscuration-unbiased MBH measurements, i.e., the stellar velocity dispersion and a BH mass prescription based on near-infrared and X-ray, and find that the virial factors do not depend on the redshift or obscuration, but some broad lines show a mild anticorrelation with MBH. Furthermore, our results show the critical impact obscuration can have on BLR characterization and the importance of the near-infrared and X-rays for a less-biased view of the BLR.
Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Engineering & Technology
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1882171
Journal Information:
The Astrophysical Journal. Supplement Series, Journal Name: The Astrophysical Journal. Supplement Series Journal Issue: 1 Vol. 261; ISSN 0067-0049
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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