2023A&A...671A..83G


Query : 2023A&A...671A..83G

2023A&A...671A..83G - Astronomy and Astrophysics, volume 671A, 83 (2023/3-1)

A newly identified galaxy group thanks to tidal streams of intragroup light.

GIRARDI M., ZARATTINI S., BOSCHIN W., NONINO M., BARTALUCCI I., MERCURIO A., NOCERINO N. and ROSATI P.

Abstract (from CDS):

Context. In the accretion-driven growth scenario, part of the intracluster light is formed in the group environment.
Aims. We report the serendipitous discovery of a group of galaxies with signs of diffuse light in the foreground of the known galaxy cluster MACS J0329-0211 at z ∼ 0.45.
Methods. Our investigation began with the detection of diffuse light streams around a pair of bright galaxies in the southeastern region of a Suprime-Cam image of the galaxy cluster MACS J0329-0211. Our analysis is based on the extended CLASH-VLT redshift catalog and on new spectroscopic data obtained ad hoc with the Italian Telescopio Nazionale Galileo. We use the density reconstruction method to analyze the redshift distribution of the galaxies in the region around the galaxy pair. We also use available photometric and X-ray data to better characterize the properties of the group.
Results. Thanks to the large amount of redshift data collected in this region, we have been able to discover the existence of a group of galaxies, here called GrG J0330-0218, which is associated with the pair of galaxies. These are the two brightest group galaxies (BGG1 and BGG2). We extracted 41 group members from the redshift catalog and estimate a mean redshift z = 0.1537 and a line-of-sight velocity dispersion σv ∼ 370 km s–1. In the phase-space diagram, the distribution of the galaxies of GrG J0330-0218 follows the characteristic trumpet-shaped pattern, which is related to the escape velocity of galaxy clusters, suggesting that the group is a virialized structure. Under this assumption, the mass of the group is M200 ∼ 6 × 1013 M. We also measured a mass-to-light ratio of ∼130 M/L and a luminosity fraction of diffuse light of ∼20% within 0.5 R200.
Conclusions. We conjecture that galaxy pairs that are surrounded by diffuse light, probably due to tidal interactions, can serve as signposts for groups.

Abstract Copyright: © The Authors 2023

Journal keyword(s): galaxies: groups: individual: GrG J0330-0218 - galaxies: groups: general - galaxies: clusters: general - galaxies: clusters: individual: MACS J0329-0211 - galaxies: kinematics and dynamics

VizieR on-line data: <Available at CDS (J/A+A/671/A83): table1.dat>

Status at CDS : Examining the need for a new acronym. // Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 ClG J0329-0212 ClG 03 29 41.6 -02 11 47           ~ 142 0
2 APMUKS (BJ) B032735.21-022839.0 G 03 30 06.752 -02 18 24.85           ~ 1 0
3 NSC J033011-021803 ClG 03 30 11.83 -02 18 03.3           ~ 1 0
4 NSC J033125-022751 ClG 03 30 11.83 -02 18 03.3           ~ 1 0
5 ZwCl 0328-0205 ClG 03 31 01.899 -01 54 49.02           ~ 1 0
6 2MASS J03311390-0156484 NIR 03 31 13.90440 -01 56 48.4152           ~ 1 0
7 LEDA 1106000 G 03 31 16.12440 -01 56 14.5068           ~ 2 0
8 NGC 1533 EmG 04 09 51.8356041744 -56 07 06.410207352   11.77 10.92 10.27 11.0 ~ 199 0
9 NAME NGC 1566 Group GrG 04 20 00.6 -54 56 17           ~ 153 0
10 ACO 545 ClG 05 32 24.4152 -11 32 35.080           ~ 97 0
11 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6660 0
12 ACO 1577 ClG 12 37 55.38 -00 16 29.7           ~ 21 0
13 M 104 LIN 12 39 59.43185902 -11 37 22.9961800 9.51 9.55 8.00 8.05   ~ 1399 3
14 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 4816 2
15 HCG 79 CGG 15 59 11.605 +20 45 24.66           ~ 114 0
16 NGC 6753 Sy2 19 11 23.635 -57 02 58.44   11.84 11.04 10.31 11.0 ~ 167 0
17 NAME Stephan's Quintet CGG 22 35 57.5 +33 57 36           ~ 439 1
18 HCG 95 CGG 23 19 32 +09 29.5           ~ 58 0

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