2015MNRAS.452.2680S

Query : 2015MNRAS.452.2680S

2015MNRAS.452.2680S - Mon. Not. R. Astron. Soc., 452, 2680-2691 (2015/September-3)

ASKAP HI imaging of the galaxy group IC 1459.

SERRA P., KORIBALSKI B., KILBORN V., ALLISON J.R., AMY S.W., BALL L., BANNISTER K., BELL M.E., BOCK D.C.-J., BOLTON R., BOWEN M., BOYLE B., BROADHURST S., BRODRICK D., BROTHERS M., BUNTON J.D., CHAPMAN J., CHENG W., CHIPPENDALE A.P., CHUNG Y., COORAY F., CORNWELL T., DEBOER D., DIAMOND P., FORSYTH R., GOUGH R., GUPTA N., HAMPSON G.A., HARVEY-SMITH L., HAY S., HAYMAN D.B., HEYWOOD I., HOTAN A.W., HOYLE S., HUMPHREYS B., INDERMUEHLE B., JACKA C., JACKSON C.A., JACKSON S., JEGANATHAN K., JOHNSTON S., JOSEPH J., KAMPHUIS P., LEACH M., LENC E., LENSSON E., MacKAY S., MARQUARDING M., MARVIL J., McCLURE-GRIFFITHS N., McCONNELL D., MEYER M., MIRTSCHIN P., NEUHOLD S., NG A., NORRIS R.P., O'SULLIVAN J., PATHIKULANGARA J., PEARCE S., PHILLIPS C., POPPING A., QIAO R.Y., REYNOLDS J.E., ROBERTS P., SAULT R.J., SCHINCKEL A.E.T., SHAW R., SHIMWELL T.W., STAVELEY-SMITH L., STOREY M., SWEETNAM A.W., TROUP E., TZIOUMIS A., VORONKOV M.A., WESTMEIER T., WHITING M., WILSON C., WONG O.I. and WU X.

Abstract (from CDS):

We present HI imaging of the galaxy group IC 1459 carried out with six antennas of the Australian Square Kilometre Array Pathfinder equipped with phased-array feeds. We detect and resolve HI in 11 galaxies down to a column density of ∼ 1020/ cm2 inside a ∼ 6 deg2 field and with a resolution of ∼ 1 arcmin on the sky and ∼ 8 km/s in velocity. We present HI images, velocity fields and integrated spectra of all detections, and highlight the discovery of three HI clouds - two in the proximity of the galaxy IC 5270 and one close to NGC 7418. Each cloud has an HI mass of ∼ 109 M☉ and accounts for ∼ 15 percent of the HI associated with its host galaxy. Available images at ultraviolet, optical and infrared wavelengths do not reveal any clear stellar counterpart of any of the clouds, suggesting that they are not gas-rich dwarf neighbours of IC 5270 and NGC 7418. Using Parkes data, we find evidence of additional extended, low-column-density HI emission around IC 5270, indicating that the clouds are the tip of the iceberg of a larger system of gas surrounding this galaxy. This result adds to the body of evidence on the presence of intragroup gas within the IC 1459 group. Altogether, the HI found outside galaxies in this group amounts to several times 109 M☉, at least 10 percent of the HI contained inside galaxies. This suggests a substantial flow of gas in and out of galaxies during the several billion years of the group's evolution.

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

Journal keyword(s): galaxies: evolution - galaxies: ISM

Nomenclature: Fig. 6: [SKK2015] North, [SKK2015] North-east.

Simbad objects: 22

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Number of rows : 22
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 5269A AG? 22 55 55.74 -36 20 57.0   14.63   13.77 14.1 ~ 45 0
3 NGC 7418 Sy1 22 56 36.1156121952 -37 01 47.845242192   11.66 11.39 10.66 11.3 ~ 172 2
4 IC 5269B GiP 22 56 36.716 -36 14 58.94   13.46   12.36 12.8 ~ 90 0
5 NGC 7418a Sy1 22 56 41.2507536815 -36 46 21.677726835   13.85   14.0 14.0 ~ 75 1
6 IC 5264 Sy2 22 56 53.035 -36 33 14.91   13.46   12.02   ~ 79 1
7 NGC 7421 EmG 22 56 54.3533970816 -37 20 50.437978152 12.61 12.64 11.93 11.71 12.1 ~ 127 1
8 IC 1459 rG 22 57 10.60682195 -36 27 43.9966421   10.96 11.85 9.34 10.3 ~ 652 2
9 2MASX J22571092-3640103 GiP 22 57 10.9339527072 -36 40 11.063855640   15.76       ~ 13 0
10 NAME IC 1459 Group GrG 22 57 16 -36 25.4           ~ 37 0
11 ESO 406-31 EmG 22 57 40.737 -35 23 49.32   14.95   13.61   ~ 32 0
12 IC 5269 EmG 22 57 43.6582942848 -36 01 34.415833188   13.48   12.06   ~ 72 0
13 [SKK2015] North HI 22 57 54.64 -35 47 59.1           ~ 2 0
14 IC 5270 EmG 22 57 54.939 -35 51 28.93   13.00   11.85 12.5 ~ 117 1
15 [SKK2015] North-east HI 22 58 20.0 -35 46 30           ~ 2 0
16 IC 5273 EmG 22 59 26.719 -37 42 10.36   11.90 11.45 11.07 11.6 ~ 153 0
17 ESO 406-40 EmG 23 00 21.6180 -37 11 59.889   16.40   15.48 16.2 ~ 18 0
18 IC 5269C LSB 23 00 48.1616458728 -35 22 14.075942592   14.20   13.356 13.7 ~ 49 0
19 LEDA 132565 EmG 23 01 14.9836367016 -35 44 01.896754020   15.975   15.080   ~ 7 0
20 LEDA 199192 AG? 23 02 00.50 -36 29 01.9           ~ 7 0
21 ESO 406-42 EmG 23 02 14.332 -37 05 00.70   14.47 12.31 13.76 13.9 ~ 50 1
22 NAME Grus GrG 23 18 -42.4           ~ 42 0

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