Lower-luminosity Obscured AGN Host Galaxies Are Not Predominantly in Major-merging Systems at Cosmic Noon

Journal
Date Issued
2021
Author(s)
Lambrides, Erini L.
•
Chiaberge, Marco
•
Heckman, Timothy
•
Kirkpatrick, Allison
•
Meyer, Eileen T.
•
Petric, Andreea
•
Hall, Kirsten
•
Long, Arianna
•
Watts, Duncan J.
•
•
Simons, Raymond
•
Tchernyshyov, Kirill
•
Rodriguez-Gomez, Vicente
•
•
de la Vega, Alexander
•
Davis, Jeffrey R.
•
Kocevski, Dale D.
•
Norman, Colin
DOI
Abstract
For over 60 yr, the scientific community has studied actively growing central supermassive black holes (active galactic nuclei, AGNs), but fundamental questions on their genesis remain unanswered. Numerical simulations and theoretical arguments show that black hole growth occurs during short-lived periods (~107-108 yr) of powerful accretion. Major mergers are commonly invoked as the most likely dissipative process to trigger the rapid fueling of AGNs. If the AGN-merger paradigm is true, we expect galaxy mergers to coincide with black hole accretion during a heavily obscured AGN phase (NH > 1023 cm-2). Starting from one of the largest samples of obscured AGNs at 0.5 < z < 3.1, we select 40 nonstarbursting lower-luminosity obscured AGNs. We then construct a one-to-one matched redshift and near-IR magnitude-matched nonstarbursting inactive galaxy control sample. Combining deep color Hubble Space Telescope imaging and a novel method of human classification, we test the merger-AGN paradigm prediction that heavily obscured AGNs are strongly associated with galaxies undergoing a major merger. On the total sample of 80 galaxies, we estimate each individual classifier's accuracy at identifying merging galaxies/postmerging systems and isolated galaxies. We calculate the probability of each galaxy being in either a major merger or an isolated system, given the accuracy of the human classifiers and the individual classifications of each galaxy. We do not find statistically significant evidence that obscured AGNs at cosmic noon are predominantly found in systems with evidence of significant merging/postmerging features.
Volume
919
Issue
2
Start page
129
Uri
Url
Issn Identifier
0004-637X
Ads BibCode
2021ApJ...919..129L
Rights
open.access
File(s)
Loading...
Thumbnail Image
Name

Lambrides_2021_ApJ_919_129.pdf

Description
Pdf editoriale
Size

2.13 MB

Format

Adobe PDF

Checksum (MD5)

abcaf44fa73711390e9e8993f1b760df