2021MNRAS.505.3795N

Query : 2021MNRAS.505.3795N

2021MNRAS.505.3795N - Mon. Not. R. Astron. Soc., 505, 3795-3809 (2021/August-2)

MeerKAT-64 discovers wide-spread tidal debris in the nearby NGC 7232 galaxy group.

NAMUMBA B., KORIBALSKI B.S., JOZSA G.I.G., LEE-WADDELL K., JONES M.G., CARIGNAN C., VERDES-MONTENEGRO L., IANJAMASIMANANA R., DE BLOK W.J.G., CLUVER M., GARRIDO J., SANCHEZ-EXPOSITO S., RAMAILA A.J.T., THORAT K., ANDATI L.A.L., HUGO B.V., KLEINER D., KAMPHUIS P., SERRA P., SMIRNOV O.M., MACCAGNI F.M., MAKHATHINI S., MOLNAR D.C., PERKINS S., RAMATSOKU M., WHITE S.V. and LOI F.

Abstract (from CDS):

We report the discovery of large amounts of previously undetected cold neutral atomic hydrogen (H I) around the core triplet galaxies in the nearby NGC 7232 galaxy group with MeerKAT. With a physical resolution of ∼1 kpc, we detect a complex web of low-surface-brightness H I emission down to a 4σ column density level of ∼1 x 1019 cm–2 (over 44 km s–1). The newly discovered H I streams extend over ∼20 arcmin corresponding to 140 kpc in projection. This is approximately three times the H I extent of the galaxy triplet (52 kpc). The H I debris has an H I mass of ∼6.6 x 109 M☉, more than 50 per cent of the total H I mass of the triplet. Within the galaxy triplet, NGC 7233 and NGC 7232 have lost a significant amount of H I while NGC 7232B appears to have an excess of H I. The H I deficiency in NGC 7232 and NGC 7233 indicates that galaxy-galaxy interaction in the group concentrates on this galaxy pair while the other disc galaxies have visited them over time. In comparison to the AMIGA sample of isolated galaxies, we find that with regards to its total H I mass the NGC 7232/3 galaxy triplet is not H I-deficient. Despite the many interactions associated to the triplet galaxies, no H I seems to have been lost from the group (yet).

Abstract Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): techniques: interferometric - galaxies: groups: individual: NGC 7232 - galaxies: interactions - intergalactic medium - radio lines: galaxies

Errata: erratum vol. 516, p. 2280 (2022)

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 ICRF J193925.0-634245 Sy2 19 39 25.0245304992 -63 42 45.640373400   18.87 18.37 17.64   ~ 1332 2
2 IC 5171 AG? 22 10 56.7198972600 -46 04 53.235672312   13.45   12.19 12.4 ~ 51 0
3 LEDA 521370 G 22 11 36.7 -45 54 29           ~ 5 0
4 ESO 288-49 AG? 22 11 48.56 -45 35 22.7   13.97   13.27 13.3 ~ 28 0
5 LEDA 519377 G 22 13 18.9 -46 04 08           ~ 3 0
6 IC 5181 GiG 22 13 21.6790033968 -46 01 03.201587940   12.44 11.69 10.91   ~ 81 0
7 LEDA 519373 G 22 13 33.2 -46 04 10           ~ 2 0
8 2MASS J22134013-4637423 G 22 13 40.13760 -46 37 42.3588           ~ 1 0
9 NGC 7232A AG? 22 13 41.4231909672 -45 53 37.172507748   14.02       ~ 38 0
10 LEDA 130765 G 22 14 03.648 -45 48 43.43   15.85       ~ 4 0
11 HIPASS J2214-45 HI 22 14 19.9 -45 55 17           ~ 4 0
12 PKS 2211-388 rG 22 14 38.56966 -38 35 45.0098           ~ 34 1
13 ESO 289-5 AG? 22 15 07.148 -46 16 53.23   14.84   13.96   ~ 14 0
14 LEDA 525163 EmG 22 15 08.01 -45 35 01.4   16.60   15.86   ~ 7 0
15 NGC 7232 GiP 22 15 38.0197322088 -45 51 00.409784904   12.58 11.79 11.00 11.9 ~ 62 0
16 NGC 7233 GiP 22 15 48.992 -45 50 47.06   12.90 12.82 11.81   ~ 55 0
17 NGC 7232B EmG 22 15 52.9160 -45 46 59.677   13.47   12.57 12.2 ~ 35 0
18 ESO 289-11 AG? 22 17 16.33 -45 03 59.4   14.94   13.90 15.0 ~ 19 0
19 ESO 289-12 AG? 22 17 34.30 -45 32 48.8   16.01   15.25 16.0 ~ 10 0
20 LEDA 130771 AG? 22 18 48.93 -46 13 03.1   16.14       ~ 12 0
21 IC 5201 AG? 22 20 57.437 -46 02 09.06   11.53   10.71 11.7 ~ 129 0
22 ESO 289-20 AG? 22 21 11.71 -45 40 35.5   15.64   14.24   ~ 16 0
23 NGC 7323 H2G 22 36 53.5833709296 +19 08 37.998072672   14.0       ~ 44 0
24 NGC 7332 GiP 22 37 24.5373044952 +23 47 53.830708800   12.0       ~ 391 0

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