2021ApJ...919...51M

Query : 2021ApJ...919...51M

2021ApJ...919...51M - Astrophys. J., 919, 51-51 (2021/September-3)

On the nature of AGN and star formation enhancement in the z = 3.1 SSA22 protocluster: the HST WFC3 IR view.

MONSON E.B., LEHMER B.D., DOORE K., EUFRASIO R.T., BONINE B., ALEXANDER D.M., HARRISON C.M., KUBO M., MANTHA K.B., SAEZ C., STRAUGHN A. and UMEHATA H.

Abstract (from CDS):

We examine possible environmental sources of the enhanced star formation and active galactic nucleus (AGN) activity in the z = 3.09 SSA22 protocluster using Hubble WFC3 F160W (∼1.6 µm) observations of the SSA22 field, including new observations centered on eight X-ray selected protocluster AGN. To investigate the role of mergers in the observed AGN and star formation enhancement, we apply both quantitative (Sersic-fit and Gini-M20) and visual morphological classifications to F160W images of protocluster Lyman-break galaxies (LBGs) in the fields of the X-ray AGN and z ∼ 3 field LBGs in SSA22 and GOODS-N. We find no statistically significant differences between the morphologies and merger fractions of protocluster and field LBGs, though we are limited by small number statistics in the protocluster. We also fit the UV-to-near-IR spectral energy distributions of F160W-detected protocluster and field LBGs to characterize their stellar masses and star formation histories. We find that the mean protocluster LBG is a factor of ∼2 times more massive and more attenuated than the mean z ∼ 3 field LBG. We take our results to suggest that ongoing mergers are not more common among protocluster LBGs than field LBGs, though protocluster LBGs appear to be more massive. We speculate that the larger mass of the protocluster LBGs contributes to the enhancement of SMBH mass and accretion rate in the protocluster, which in turn drives the observed protocluster AGN enhancement.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): High-redshift galaxy clusters - High-redshift galaxies - Active galactic nuclei - X-ray active galactic nuclei - Galaxy mergers

VizieR on-line data: <Available at CDS (J/ApJ/919/51): table2.dat>

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 24

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Number of rows : 24
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 [OID2018] DRC cluster PCG 00 42 23.6 -33 43 38           ~ 28 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
3 ClG J0218-0510 ClG 02 18 21.3 -05 10 27           ~ 82 0
4 NAME 2QZ Cluster ClG 10 03 51.0 +00 15 09           ~ 11 0
5 NAME GOODS-N Field reg 12 36 55.0 +62 14 15           ~ 1364 1
6 NAME HS 1700 Protocluster PCG 17 01.0 +64 12           ~ 38 0
7 [TKN2009] SSA22-AzTEC14 G 22 17 00.34 +00 10 42.6           ~ 3 0
8 SAS-LBG SSA22a-M38 G 22 17 17.69 +00 19 00.7       24.11   ~ 11 0
9 SAS-LBG SSA22a-D17 G 22 17 18.87 +00 18 16.8       24.29   ~ 13 0
10 SAS-LBG SSA22a-C30 G 22 17 19.28 +00 15 44.7       23.70   ~ 9 0
11 SAS-LBG SSA22a-C35 G 22 17 20.22 +00 16 52.3       24.06   ~ 10 0
12 SAS-LBG SSA22a-C47 EmO 22 17 20.33 +00 17 32.1       23.78   ~ 16 0
13 SAS-LBG SSA22a-C39 G 22 17 20.98 +00 17 09.4       25.04   ~ 8 0
14 SAS-LBG SSA22a-C41 G 22 17 24.44 +00 17 14.7           ~ 4 0
15 SAS-LBG SSA22a-MD37 G 22 17 26.65 +00 16 39.0           ~ 3 0
16 SAS-LBG SSA22a-M25 G 22 17 31.49 +00 16 31.2           ~ 4 0
17 SAS-LBG SSA22a-M28 EmG 22 17 31.69 +00 16 57.6       24.75   ~ 25 0
18 [TKN2009] SSA22-AzTEC1 G 22 17 32.42 +00 17 35.5           ~ 7 0
19 NAME SSA22 Protocluster PCG 22 17 34.0 +00 17 01           ~ 175 0
20 SSA 22 reg 22 17 34.7 +00 15 07           ~ 351 0
21 SAS-LBG SSA22a-MD20 G 22 17 35.07 +00 14 22.4           ~ 3 0
22 ALMA J221736.54+001622.7 QSO 22 17 36.538 +00 16 22.56 23.9106 22.4187 21.6993 21.3836 21.3640 ~ 32 0
23 SAS-LBG SSA22a-M31 G 22 17 36.87 +00 17 12.4           ~ 5 0
24 SAS-LBG SSA22a-MD14 G 22 17 37.95 +00 13 43.6   25.46 24.66 24.38   ~ 9 0

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