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Title: X-ray detected AGN in SDSS dwarf galaxies

Abstract

ABSTRACT In this work we present a robust quantification of X-ray selected AGN in local (z ≤ 0.25) dwarf galaxies ($$M_\mathrm{*} \le 3 \times 10^9 \, \mathrm{M_\odot }$$). We define a parent sample of 4331 dwarf galaxies found within the footprint of both the MPA-JHU galaxy catalogue (based on SDSS DR8) and 3XMM DR7, performed a careful review of the data to remove misidentifications and produced a sample of 61 dwarf galaxies that exhibit nuclear X-ray activity indicative of an AGN. We examine the optical emission line ratios of our X-ray selected sample and find that optical AGN diagnostics fail to identify 85 per cent of the sources. We then calculated the growth rates of the black holes powering our AGN in terms of their specific accretion rates (∝ LX/M*, an approximate tracer of the Eddington ratio). Within our observed sample, we found a wide range of specific accretion rates. After correcting the observed sample for the varying sensitivity of 3XMM, we found further evidence for a wide range of X-ray luminosities and specific accretion rates, described by a power law. Using this corrected AGN sample we also define an AGN fraction describing their relative incidence within the parent sample. We found the AGN fraction increases with host galaxy mass (up to ≈6 per cent) for galaxies with X-ray luminosities between $$10^{39} \, $$ and $$10^{42} \, \mathrm{erg\, s^{-1}}$$, and by extrapolating the power law to higher luminosities, we found evidence to suggest the fraction of luminous AGN ($$L_\mathrm{X} \ge 10^{42.4} \, \mathrm{erg\, s^{-1}}$$) is constant out to z ≈ 0.7.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1]
  1. Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1591965
Resource Type:
Published Article
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 492 Journal Issue: 2; Journal ID: ISSN 0035-8711
Publisher:
Oxford University Press
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Birchall, Keir L., Watson, M. G., and Aird, J. X-ray detected AGN in SDSS dwarf galaxies. United Kingdom: N. p., 2020. Web. doi:10.1093/mnras/staa040.
Birchall, Keir L., Watson, M. G., & Aird, J. X-ray detected AGN in SDSS dwarf galaxies. United Kingdom. doi:10.1093/mnras/staa040.
Birchall, Keir L., Watson, M. G., and Aird, J. Fri . "X-ray detected AGN in SDSS dwarf galaxies". United Kingdom. doi:10.1093/mnras/staa040.
@article{osti_1591965,
title = {X-ray detected AGN in SDSS dwarf galaxies},
author = {Birchall, Keir L. and Watson, M. G. and Aird, J.},
abstractNote = {ABSTRACT In this work we present a robust quantification of X-ray selected AGN in local (z ≤ 0.25) dwarf galaxies ($M_\mathrm{*} \le 3 \times 10^9 \, \mathrm{M_\odot }$). We define a parent sample of 4331 dwarf galaxies found within the footprint of both the MPA-JHU galaxy catalogue (based on SDSS DR8) and 3XMM DR7, performed a careful review of the data to remove misidentifications and produced a sample of 61 dwarf galaxies that exhibit nuclear X-ray activity indicative of an AGN. We examine the optical emission line ratios of our X-ray selected sample and find that optical AGN diagnostics fail to identify 85 per cent of the sources. We then calculated the growth rates of the black holes powering our AGN in terms of their specific accretion rates (∝ LX/M*, an approximate tracer of the Eddington ratio). Within our observed sample, we found a wide range of specific accretion rates. After correcting the observed sample for the varying sensitivity of 3XMM, we found further evidence for a wide range of X-ray luminosities and specific accretion rates, described by a power law. Using this corrected AGN sample we also define an AGN fraction describing their relative incidence within the parent sample. We found the AGN fraction increases with host galaxy mass (up to ≈6 per cent) for galaxies with X-ray luminosities between $10^{39} \, $ and $10^{42} \, \mathrm{erg\, s^{-1}}$, and by extrapolating the power law to higher luminosities, we found evidence to suggest the fraction of luminous AGN ($L_\mathrm{X} \ge 10^{42.4} \, \mathrm{erg\, s^{-1}}$) is constant out to z ≈ 0.7.},
doi = {10.1093/mnras/staa040},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 2,
volume = 492,
place = {United Kingdom},
year = {2020},
month = {1}
}

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