2016MNRAS.457.2613R


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.21CEST16:01:43

2016MNRAS.457.2613R - Mon. Not. R. Astron. Soc., 457, 2613-2641 (2016/April-2)

H I emission and absorption in nearby, gas-rich galaxies - II. Sample completion and detection of intervening absorption in NGC 5156.

REEVES S.N., SADLER E.M., ALLISON J.R., KORIBALSKI B.S., CURRAN S.J., PRACY M.B., PHILLIPS C.J., BIGNALL H.E. and REYNOLDS C.

Abstract (from CDS):

We present the results of a survey for intervening 21 cm H i absorption in a sample of 10 nearby, gas-rich galaxies selected from the H i Parkes All-Sky Survey (HIPASS). This follows the six HIPASS galaxies searched in previous work and completes our full sample. In this paper, we searched for absorption along 17 sightlines with impact parameters between 6 and 46 kpc, making one new detection. We also obtained simultaneous H i emission-line data, allowing us to directly relate the absorption-line detection rate to the H i distribution. From this, we find the majority of the non-detections in the current sample are because sightline does not intersect the H i disc of the galaxy at sufficiently high column density, but that source structure is also an important factor. The detected absorption-line arises in the galaxy NGC 5156 (z=0.01) at an impact parameter of 19 kpc. The line is deep and narrow with an integrated optical depth of 0.82 km/s. High-resolution Australia Telescope Compact Array (ATCA) images at 5 and 8 GHz reveal that the background source is resolved into two components with a separation of 2.6 arcsec (500 pc at the redshift of the galaxy), with the absorption likely occurring against a single component. We estimate that the ratio of the spin temperature and covering factor, TS/f, is approximately 950 K in the outer disc of NGC 5156, but further observations using very long baseline interferometry would allow us to accurately measure the covering factor and spin temperature of the gas.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: evolution - galaxies: individual: NGC 5156 - galaxies: ISM - radio lines: galaxies

Simbad objects: 35

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Number of rows : 35

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 ESO 150-5 G 00 22 25.56 -53 38 51.0   14.02   13.33 13.1 ~ 34 0
2 SUMSS J030917-531756 Rad 03 09 17.15 -53 17 56.9           ~ 1 0
3 ESO 300-14 LSB 03 09 37.87 -41 01 49.7   13.12   12.10 12.8 ~ 62 0
4 SUMSS J030938-532417 Rad 03 09 38.05 -53 24 17.3           ~ 1 0
5 SUMSS J030941-410006 Rad 03 09 41.24 -41 00 06.8           ~ 1 0
6 SUMSS J030946-410456 Rad 03 09 46.24 -41 04 56.6           ~ 1 0
7 SUMSS J030954-532339 Rad 03 09 54.31 -53 23 39.2           ~ 1 0
8 NGC 1249 GiG 03 10 01.2145058501 -53 20 09.004529516   12.16   11.25 12.2 ~ 89 0
9 ESO 357-12 GiC 03 16 53.5 -35 32 29   13.78   12.68 13.2 ~ 63 0
10 SUMSS J031705-353440 Rad 03 17 05.10 -35 34 40.3           ~ 1 0
11 IC 1914 G 03 19 25.2107939269 -49 35 58.993213725   13.28   12.00 13.3 ~ 47 0
12 SUMSS J031955-493551 Rad 03 19 55.29 -49 35 51.1           ~ 1 0
13 IC 1954 GiG 03 31 31.393 -51 54 17.54   12.14   11.15 11.8 ~ 99 0
14 NGC 1566 Sy1 04 20 00.4020009055 -54 56 16.578104141 10.29 10.19 9.73 9.21 10.1 ~ 728 2
15 SUMSS J042007-545143 Rad 04 20 07.48 -54 51 43.4           ~ 1 0
16 SUMSS J042015-545345 Rad 04 20 15.32 -54 53 45.2           ~ 1 0
17 SUMSS J054100-354634 Rad 05 41 00.16 -35 46 34.2           ~ 1 0
18 ESO 363-15 G 05 41 00.7 -35 42 32   13.92   12.90 12.9 ~ 30 0
19 SUMSS J054104-354640 Rad 05 41 04.72 -35 46 40.3           ~ 1 0
20 NGC 2188 EmG 06 10 09.53 -34 06 22.3   12.10 11.82 11.39   ~ 95 0
21 SUMSS J061019-340258 Rad 06 10 19.16 -34 02 58.7           ~ 1 0
22 NGC 5156 GiG 13 28 44.095 -48 55 00.53   12.54 11.99 11.33 11.6 ~ 58 0
23 PMN J1328-4856 Rad 13 28 46.50 -48 56 38.0           ~ 4 1
24 SUMSS J141455-440101 Rad 14 14 55.11 -44 01 01.8           ~ 1 0
25 IC 4386 G 14 15 03.1 -43 57 45   12.74   12.49 12.6 ~ 25 1
26 SUMSS J141517-435922 Rad 14 15 17.99 -43 59 22.5           ~ 1 0
27 ICRF J193925.0-634245 Sy2 19 39 25.02671 -63 42 45.6255   18.87 18.37 17.64   ~ 969 1
28 ESO 402-25 GiP 21 22 15.784 -36 37 39.65   16.43   14.9 15.0 ~ 25 0
29 ESO 288-28 GiP 22 00 35.4 -43 08 28   13.54   12.64 13.3 ~ 47 0
30 SUMSS J220040-430950 Rad 22 00 40.68 -43 09 50.1           ~ 1 0
31 SUMSS J220057-431138 Rad 22 00 57.05 -43 11 38.8           ~ 1 0
32 ESO 345-46 G 22 43 15.7 -39 52 03   13.22   12.62 13.3 ~ 36 0
33 NGC 7412 GiG 22 55 45.7651763342 -42 38 31.058747966   11.82 11.38 12.0 11.4 ~ 105 0
34 NGC 7424 GiG 22 57 18.3921716643 -41 04 14.121758456   10.88 10.38 10.02 10.9 ~ 195 0
35 NAME Local Group GrG ~ ~           ~ 7071 0

    Equat.    Gal    SGal    Ecl

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2020.10.21-16:01:43

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