BAT AGN spectroscopic survey-II. X-ray emission and high-ionization optical emission lines

Simon Berney, Michael Koss, Benny Trakhtenbrot, Claudio Ricci, Isabella Lamperti, Kevin Schawinski, Mislav Baloković, D. Michael Crenshaw, Travis Fischer, Neil Gehrels, Fiona Harrison, Yasuhiro Hashimoto, Kohei Ichikawa, Richard Mushotzky, Kyuseok Oh, Daniel Stern, Ezequiel Treister, Yoshihiro Ueda, Sylvain Veilleux, Lisa Winter

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

We investigate the relationship between X-ray and optical line emission in 340 nearby (z ≃ 0.04) AGN selected above 10 keV using Swift BAT. We find a weak correlation between the extinction corrected [O III] and hard X-ray luminosity (Lint[OIII] ∝ L14-195) with a large scatter (RPear = 0.64, σ = 0.62 dex) and a similarly large scatter with the intrinsic 2-10 keV to [OIII] luminosities (RPear = 0.63, s = 0.63 dex). Correlations of the hard X-ray fluxes with the fluxes of high-ionization narrow lines ([O III], He II, [NeIII] and [Ne V]) are not significantly better than with the low-ionization lines (H α, [SII]). Factors like obscuration or physical slit size are not found to be a significant part of the large scatter. In contrast, the optical emission lines show much better correlations with each other (σ = 0.3 dex) than with the X-ray flux. The inherent large scatter questions the common usage of narrow emission lines as AGN bolometric luminosity indicators and suggests that other issues such as geometrical differences in the scattering of the ionized gas or long-term AGN variability are important.

Original languageEnglish
Pages (from-to)3622-3634
Number of pages13
JournalMonthly Notices of the Royal Astronomical Society
Volume454
Issue number4
DOIs
Publication statusPublished - 2015 Jan 1

Fingerprint

light emission
ionization
luminosity
x rays
occultation
ionized gases
slits
extinction
scattering
gas

Keywords

  • Black hole physics
  • Galaxies: active
  • Galaxies: nuclei
  • Quasars: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Berney, S., Koss, M., Trakhtenbrot, B., Ricci, C., Lamperti, I., Schawinski, K., ... Winter, L. (2015). BAT AGN spectroscopic survey-II. X-ray emission and high-ionization optical emission lines. Monthly Notices of the Royal Astronomical Society, 454(4), 3622-3634. https://doi.org/10.1093/mnras/stv2181

BAT AGN spectroscopic survey-II. X-ray emission and high-ionization optical emission lines. / Berney, Simon; Koss, Michael; Trakhtenbrot, Benny; Ricci, Claudio; Lamperti, Isabella; Schawinski, Kevin; Baloković, Mislav; Crenshaw, D. Michael; Fischer, Travis; Gehrels, Neil; Harrison, Fiona; Hashimoto, Yasuhiro; Ichikawa, Kohei; Mushotzky, Richard; Oh, Kyuseok; Stern, Daniel; Treister, Ezequiel; Ueda, Yoshihiro; Veilleux, Sylvain; Winter, Lisa.

In: Monthly Notices of the Royal Astronomical Society, Vol. 454, No. 4, 01.01.2015, p. 3622-3634.

Research output: Contribution to journalArticle

Berney, S, Koss, M, Trakhtenbrot, B, Ricci, C, Lamperti, I, Schawinski, K, Baloković, M, Crenshaw, DM, Fischer, T, Gehrels, N, Harrison, F, Hashimoto, Y, Ichikawa, K, Mushotzky, R, Oh, K, Stern, D, Treister, E, Ueda, Y, Veilleux, S & Winter, L 2015, 'BAT AGN spectroscopic survey-II. X-ray emission and high-ionization optical emission lines', Monthly Notices of the Royal Astronomical Society, vol. 454, no. 4, pp. 3622-3634. https://doi.org/10.1093/mnras/stv2181
Berney, Simon ; Koss, Michael ; Trakhtenbrot, Benny ; Ricci, Claudio ; Lamperti, Isabella ; Schawinski, Kevin ; Baloković, Mislav ; Crenshaw, D. Michael ; Fischer, Travis ; Gehrels, Neil ; Harrison, Fiona ; Hashimoto, Yasuhiro ; Ichikawa, Kohei ; Mushotzky, Richard ; Oh, Kyuseok ; Stern, Daniel ; Treister, Ezequiel ; Ueda, Yoshihiro ; Veilleux, Sylvain ; Winter, Lisa. / BAT AGN spectroscopic survey-II. X-ray emission and high-ionization optical emission lines. In: Monthly Notices of the Royal Astronomical Society. 2015 ; Vol. 454, No. 4. pp. 3622-3634.
@article{eabd8ca6e8774f4a9bc827f1e3505928,
title = "BAT AGN spectroscopic survey-II. X-ray emission and high-ionization optical emission lines",
abstract = "We investigate the relationship between X-ray and optical line emission in 340 nearby (z ≃ 0.04) AGN selected above 10 keV using Swift BAT. We find a weak correlation between the extinction corrected [O III] and hard X-ray luminosity (Lint[OIII] ∝ L14-195) with a large scatter (RPear = 0.64, σ = 0.62 dex) and a similarly large scatter with the intrinsic 2-10 keV to [OIII] luminosities (RPear = 0.63, s = 0.63 dex). Correlations of the hard X-ray fluxes with the fluxes of high-ionization narrow lines ([O III], He II, [NeIII] and [Ne V]) are not significantly better than with the low-ionization lines (H α, [SII]). Factors like obscuration or physical slit size are not found to be a significant part of the large scatter. In contrast, the optical emission lines show much better correlations with each other (σ = 0.3 dex) than with the X-ray flux. The inherent large scatter questions the common usage of narrow emission lines as AGN bolometric luminosity indicators and suggests that other issues such as geometrical differences in the scattering of the ionized gas or long-term AGN variability are important.",
keywords = "Black hole physics, Galaxies: active, Galaxies: nuclei, Quasars: general",
author = "Simon Berney and Michael Koss and Benny Trakhtenbrot and Claudio Ricci and Isabella Lamperti and Kevin Schawinski and Mislav Baloković and Crenshaw, {D. Michael} and Travis Fischer and Neil Gehrels and Fiona Harrison and Yasuhiro Hashimoto and Kohei Ichikawa and Richard Mushotzky and Kyuseok Oh and Daniel Stern and Ezequiel Treister and Yoshihiro Ueda and Sylvain Veilleux and Lisa Winter",
year = "2015",
month = "1",
day = "1",
doi = "10.1093/mnras/stv2181",
language = "English",
volume = "454",
pages = "3622--3634",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "4",

}

TY - JOUR

T1 - BAT AGN spectroscopic survey-II. X-ray emission and high-ionization optical emission lines

AU - Berney, Simon

AU - Koss, Michael

AU - Trakhtenbrot, Benny

AU - Ricci, Claudio

AU - Lamperti, Isabella

AU - Schawinski, Kevin

AU - Baloković, Mislav

AU - Crenshaw, D. Michael

AU - Fischer, Travis

AU - Gehrels, Neil

AU - Harrison, Fiona

AU - Hashimoto, Yasuhiro

AU - Ichikawa, Kohei

AU - Mushotzky, Richard

AU - Oh, Kyuseok

AU - Stern, Daniel

AU - Treister, Ezequiel

AU - Ueda, Yoshihiro

AU - Veilleux, Sylvain

AU - Winter, Lisa

PY - 2015/1/1

Y1 - 2015/1/1

N2 - We investigate the relationship between X-ray and optical line emission in 340 nearby (z ≃ 0.04) AGN selected above 10 keV using Swift BAT. We find a weak correlation between the extinction corrected [O III] and hard X-ray luminosity (Lint[OIII] ∝ L14-195) with a large scatter (RPear = 0.64, σ = 0.62 dex) and a similarly large scatter with the intrinsic 2-10 keV to [OIII] luminosities (RPear = 0.63, s = 0.63 dex). Correlations of the hard X-ray fluxes with the fluxes of high-ionization narrow lines ([O III], He II, [NeIII] and [Ne V]) are not significantly better than with the low-ionization lines (H α, [SII]). Factors like obscuration or physical slit size are not found to be a significant part of the large scatter. In contrast, the optical emission lines show much better correlations with each other (σ = 0.3 dex) than with the X-ray flux. The inherent large scatter questions the common usage of narrow emission lines as AGN bolometric luminosity indicators and suggests that other issues such as geometrical differences in the scattering of the ionized gas or long-term AGN variability are important.

AB - We investigate the relationship between X-ray and optical line emission in 340 nearby (z ≃ 0.04) AGN selected above 10 keV using Swift BAT. We find a weak correlation between the extinction corrected [O III] and hard X-ray luminosity (Lint[OIII] ∝ L14-195) with a large scatter (RPear = 0.64, σ = 0.62 dex) and a similarly large scatter with the intrinsic 2-10 keV to [OIII] luminosities (RPear = 0.63, s = 0.63 dex). Correlations of the hard X-ray fluxes with the fluxes of high-ionization narrow lines ([O III], He II, [NeIII] and [Ne V]) are not significantly better than with the low-ionization lines (H α, [SII]). Factors like obscuration or physical slit size are not found to be a significant part of the large scatter. In contrast, the optical emission lines show much better correlations with each other (σ = 0.3 dex) than with the X-ray flux. The inherent large scatter questions the common usage of narrow emission lines as AGN bolometric luminosity indicators and suggests that other issues such as geometrical differences in the scattering of the ionized gas or long-term AGN variability are important.

KW - Black hole physics

KW - Galaxies: active

KW - Galaxies: nuclei

KW - Quasars: general

UR - http://www.scopus.com/inward/record.url?scp=84949255182&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84949255182&partnerID=8YFLogxK

U2 - 10.1093/mnras/stv2181

DO - 10.1093/mnras/stv2181

M3 - Article

AN - SCOPUS:84949255182

VL - 454

SP - 3622

EP - 3634

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 4

ER -