Erik B. Monson
Revisiting the Properties of X-Ray Active Galactic Nuclei in the SSA22 Protocluster: Normal Supermassive Black Hole and Host-galaxy Growth for AGNs in a z = 3.09 Overdensity
Monson, Erik B.; Doore, Keith; Eufrasio, Rafael T.; Lehmer, Bret D.; Alexander, David M.; Harrison, Chris M.; Kubo, Mariko; Saez, Cristian; Umehata, Hideki
Authors
Keith Doore
Rafael T. Eufrasio
Bret D. Lehmer
Professor David Alexander d.m.alexander@durham.ac.uk
Professor
Chris M. Harrison
Mariko Kubo
Cristian Saez
Hideki Umehata
Abstract
We analyze the physical properties of eight X-ray-selected active galactic nuclei (AGNs) and one candidate protoquasar system (ADF22A1) in the z = 3.09 SSA22 protocluster by fitting their X-ray-to-IR spectral energy distributions (SEDs) using our SED-fitting code, Lightning (https://www.github.com/rafaeleufrasio/lightning). We recover star formation histories (SFHs) for seven of these systems which are well fit by composite stellar population plus AGN models. We find indications that four out of nine of the SSA22 AGN systems we study have host galaxies below the main sequence, with SFR/SFRMS ≤ −0.4. The remaining SSA22 systems, including ADF22A1, are consistent with obscured supermassive black hole (SMBH) growth in star-forming galaxies. We estimate the SMBH accretion rates and masses, and compare the properties and SFHs of the nine protocluster AGN systems with X-ray-detected AGN candidates in the Chandra Deep Fields (CDF), finding that the distributions of SMBH growth rates, star formation rates (SFRs), SMBH masses, and stellar masses for the protocluster AGNs are consistent with field AGNs. We constrain the ratio between the sample-averaged SSA22 SMBH mass and CDF SMBH mass to <1.41. While the AGNs are located near the density peaks of the protocluster, we find no statistically significant trends between the AGN or host-galaxy properties and their location in the protocluster. We interpret the similarity of the protocluster and field AGN populations together with existing results as suggesting that the protocluster and field AGNs coevolve with their hosts in the same ways, while AGN-triggering events are more likely in the protocluster.
Citation
Monson, E. B., Doore, K., Eufrasio, R. T., Lehmer, B. D., Alexander, D. M., Harrison, C. M., …Umehata, H. (2023). Revisiting the Properties of X-Ray Active Galactic Nuclei in the SSA22 Protocluster: Normal Supermassive Black Hole and Host-galaxy Growth for AGNs in a z = 3.09 Overdensity. Astrophysical Journal, 951(1), Article 15. https://doi.org/10.3847/1538-4357/acd449
Journal Article Type | Article |
---|---|
Acceptance Date | May 9, 2023 |
Online Publication Date | Jun 29, 2023 |
Publication Date | Jul 1, 2023 |
Deposit Date | Oct 25, 2023 |
Publicly Available Date | Oct 25, 2023 |
Journal | The Astrophysical Journal |
Print ISSN | 0004-637X |
Electronic ISSN | 1538-4357 |
Publisher | American Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 951 |
Issue | 1 |
Article Number | 15 |
DOI | https://doi.org/10.3847/1538-4357/acd449 |
Keywords | Space and Planetary Science; Astronomy and Astrophysics |
Public URL | https://durham-repository.worktribe.com/output/1817724 |
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Copyright Statement
© 2023. The Author(s). Published by the American Astronomical Society.
Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
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