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27 April 2024 |
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Evidence for Merger-Driven Growth in Luminous, High-z, Obscured AGN in the CANDELS/COSMOS Field | | J. L. Donley
; J. Kartaltepe
; D. Kocevski
; M. Salvato
; P. Santini
; H. Suh
; F. Civano
; A. M. Koekemoer
; J. Trump
; M. Brusa
; C. Cardamone
; A. Castro
; M. Cisternas
; C. Conselice
; D. Croton
; N. Hathi
; C. Liu
; R. A. Lucas
; P. Nair
; D. Rosario
; D. Sanders
; B. Simmons
; C. Villforth
; D. M. Alexander
; E. F. Bell
; S. M. Faber
; N. A. Grogin
; J. Lotz
; D. H. McIntosh
; T. Nagao
; | | Date: |
6 Dec 2017 | | Abstract: | While major mergers have long been proposed as a driver of both AGN activity
and the M-sigma relation, studies of moderate to high redshift
Seyfert-luminosity AGN hosts have found little evidence for enhanced rates of
interactions. However, both theory and observation suggest that while these AGN
may be fueled by stochastic accretion and secular processes, high-luminosity,
high-redshift, and heavily obscured AGN are the AGN most likely to be
merger-driven. To better sample this population of AGN, we turn to infrared
selection in the CANDELS/COSMOS field. Compared to their lower-luminosity and
less obscured X-ray-only counterparts, IR-only AGN (luminous, heavily obscured
AGN) are more likely to be classified as either irregular (50$^{+12}_{-12}$%
vs. 9$^{+5}_{-2}$%) or asymmetric (69$^{+9}_{-13}$% vs. 17$^{+6}_{-4}$%) and
are less likely to have a spheroidal component (31$^{+13}_{-9}$% vs.
77$^{+4}_{-6}$%). Furthermore, IR-only AGN are also significantly more likely
than X-ray-only AGN (75$^{+8}_{-13}$% vs. 31$^{+6}_{-6}$%) to be classified
either as interacting or merging in a way that significantly disturbs the host
galaxy or disturbed though not clearly interacting or merging, which
potentially represents the late stages of a major merger. This suggests that
while major mergers may not contribute significantly to the fueling of Seyfert
luminosity AGN, interactions appear to play a more dominant role in the
triggering and fueling of high-luminosity heavily obscured AGN. | | Source: | arXiv, 1712.2424 | | Services: | Forum | Review | PDF | Favorites | |
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