2015MNRAS.452.1617H

Query : 2015MNRAS.452.1617H

2015MNRAS.452.1617H - Mon. Not. R. Astron. Soc., 452, 1617-1636 (2015/September-2)

KAT-7 science verification: cold gas, star formation, and substructure in the nearby Antlia Cluster.

HESS K.M., JARRETT T.H., CARIGNAN C., PASSMOOR S.S. and GOEDHART S.

Abstract (from CDS):

The Antlia Cluster is a nearby, dynamically young structure, and its proximity provides a valuable opportunity for detailed study of galaxy and group accretion on to clusters. We present a deep Hi mosaic completed as part of spectral line commissioning of the Karoo Array Telescope (KAT-7), and identify infrared counterparts from the Widefield Infrared Survey Explorer extended source catalogue to study neutral atomic gas content and star formation within the cluster. We detect 37 cluster members out to a radius of ∼ 0.9 Mpc with M_H I>5×10^7M☉. Of these, 35 are new Hi detections, 27 do not have previous spectroscopic redshift measurements, and one is the Compton thick Seyfert II, NGC 3281, which we detect in Hi absorption. The Hi galaxies lie beyond the X-ray-emitting region 200 kpc from the cluster centre and have experienced ram pressure stripping out to at least 600 kpc. At larger radii, they are distributed asymmetrically suggesting accretion from surrounding filaments. Combining Hi with optical redshifts, we perform a detailed dynamical analysis of the internal substructure, identify large infalling groups, and present the first compilation of the large-scale distribution of Hi and star-forming galaxies within the cluster. We find that elliptical galaxy NGC 3268 is at the centre of the oldest substructure and argue that NGC 3258 and its companion population are more recent arrivals. Through the presence of Hi and ongoing star formation, we rank substructures with respect to their relative time since accretion on to Antlia.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): galaxies: clusters: individual: Antlia Cluster - galaxies: distances and redshifts - galaxies: evolution - galaxies: kinematics and dynamics - infrared: galaxies - radio lines: galaxies

Nomenclature: Table 2: KAT7HI JHHMMSS+DDMMSS N=37.

Simbad objects: 55

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Number of rows : 55
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 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
2 ICRF J052109.8+163822 Sy1 05 21 09.88596258 +16 38 22.0515459   19.37 18.84 18.480   ~ 910 1
3 NAME HYA SUPERCL SCG 08 57.9 +03 10           ~ 204 0
4 ACO 963 ClG 10 17 03.4 +39 02 56           ~ 414 0
5 QSO B1015-314 QSO 10 18 09.2596731312 -31 44 14.006765436   21 20.4     ~ 73 1
6 KAT7HI J102613-350826 HI 10 26 12.30 -35 08 56.0           ~ 1 0
7 NGC 3249 EmG 10 26 22.1962915536 -34 57 49.056441084   13.86   12.54   ~ 31 0
8 LEDA 82948 GiG 10 26 50.7 -34 38 47   18.2       ~ 5 0
9 KAT7HI J102657-342309 HI 10 26 57.0 -34 23 09           ~ 1 0
10 MCG-06-23-029 EmG 10 27 02.497 -36 13 41.54   14.56   13.15   ~ 62 1
11 ESO 375-30 AG? 10 27 47.0809 -34 31 55.755   16.73   16.11 16.6 ~ 10 0
12 2MASX J10275902-3520157 EmG 10 27 59.029 -35 20 15.77           ~ 4 0
13 LEDA 82992 EmG 10 28 03.131 -35 26 31.75   15.2       ~ 14 0
14 KAT7HI J102831-354041 HI 10 28 31.70 -35 40 38.0           ~ 1 0
15 LEDA 83019 GiG 10 28 34.20696 -35 27 38.8800   17.0       ~ 12 0
16 LEDA 83018 GiG 10 28 34.3 -36 26 09   16.8       ~ 5 0
17 KAT7HI J102842-351238 HI 10 28 40.97 -35 12 34.9           ~ 1 0
18 LEDA 83022 GiG 10 28 42.6 -34 41 46   19.2       ~ 5 0
19 LEDA 83023 GiG 10 28 43.6 -35 07 26   18.0       ~ 5 0
20 NGC 3258 EmG 10 28 53.588 -35 36 19.98   12.50 11.72 10.86   ~ 200 0
21 LEDA 83040 GiG 10 29 01.6 -35 34 01   17.8       ~ 8 0
22 MCG-06-23-034 GiG 10 29 11.0589500280 -35 41 16.663424100   15       ~ 13 0
23 KAT7HI J102915-354139 HI 10 29 15.11 -35 41 41.6           ~ 1 0
24 KAT7HI J102926-350057 HI 10 29 26.42 -35 00 52.5           ~ 1 0
25 LEDA 83067 Sy2 10 29 28.3988149776 -34 40 21.816149556   16.0       ~ 9 0
26 ACO S 636 ClG 10 29 41.0957 -35 19 32.908           ~ 248 0
27 WISEA J102956.70-344834.1 MIR 10 29 56.706 -34 48 34.16           ~ 1 0
28 KAT7HI J103000-344727 HI 10 29 57.52 -34 48 31.3           ~ 1 0
29 NGC 3268 EmG 10 30 00.6490581240 -35 19 31.519591284   12.57 11.77 10.68   ~ 163 0
30 KAT7HI J103009-360601 HI 10 30 05.98 -36 06 23.0           ~ 1 0
31 KAT7HI J103013-342928 HI 10 30 14.11 -34 28 44.9           ~ 1 0
32 MCG-06-23-042 Sy1 10 30 19.5415040400 -34 24 17.704425888   14.56   13.46   ~ 36 0
33 KAT7HI J103019-353537 HI 10 30 20.84 -35 35 30.8           ~ 1 0
34 MCG-06-23-043 EmG 10 30 25.7964678768 -35 06 28.870330500   15   14.08   ~ 20 0
35 NGC 3271 BiC 10 30 26.5035080808 -35 21 34.063890048   12.72 11.73 11.03   ~ 77 1
36 KAT7HI J103054-355825 HI 10 30 50.43 -35 58 36.5           ~ 1 0
37 KAT7HI J103053-345344 HI 10 30 54.96 -34 53 25.0           ~ 1 0
38 KAT7HI J103100-350027 HI 10 31 00.0 -35 00 27           ~ 1 0
39 KAT7HI J103100-342351 HI 10 31 02.56 -34 24 06.0           ~ 1 0
40 KAT7HI J103107-353108 HI 10 31 10.89 -35 31 25.3           ~ 1 0
41 NGC 3258C Sy2 10 31 24.1774670640 -35 13 13.700128692   14.61   13.30   ~ 34 0
42 KAT7HI J103132-353206 HI 10 31 33.77 -35 32 17.1           ~ 1 0
43 KAT7HI J103129-351826 HI 10 31 34.49 -35 19 20.4           ~ 1 0
44 LEDA 83201 GiG 10 31 49.0 -35 12 22   15.5       ~ 6 0
45 NGC 3281 Sy2 10 31 52.086 -34 51 13.40   12.62 14.02 11.17   ~ 392 1
46 NAME Great Attractor SCG 10 32 -46.0           ~ 617 0
47 KAT7HI J103213-343210 HI 10 32 13.25 -34 31 57.4           ~ 1 0
48 KAT7HI J103222-345033 HI 10 32 22.0 -34 50 33           ~ 1 0
49 LEDA 83229 GiG 10 32 54.1 -36 04 40   16.8       ~ 4 0
50 NAME Hydra I Cluster ClG 10 36 36.0 -27 31 04           ~ 905 1
51 ACO 1367 ClG 11 44 44.6 +19 41 59           ~ 1127 1
52 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
53 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
54 NAME Shapley Supercluster SCG 13 06.0 -33 04           ~ 677 0
55 ICRF J193925.0-634245 Sy2 19 39 25.0245304992 -63 42 45.640373400   18.87 18.37 17.64   ~ 1332 2

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