2019MNRAS.482.3591R


Query : 2019MNRAS.482.3591R

2019MNRAS.482.3591R - Mon. Not. R. Astron. Soc., 482, 3591-3608 (2019/January-3)

WALLABY early science - I. The NGC 7162 galaxy group.

REYNOLDS T.N., WESTMEIER T., STAVELEY-SMITH L., ELAGALI A., FOR B.-Q., KLEINER D., KORIBALSKI B.S., LEE-WADDELL K., MADRID J.P., POPPING A., RHEE J., WHITING M., WONG O.I., DAVIES L.J.M., DRIVER S., ROBOTHAM A., ALLISON J.R., BEKIARIS G., COLLIER J.D., HEALD G., MEYER M., CHIPPENDALE A.P., MacLEOD A. and VORONKOV M.A.

Abstract (from CDS):

We present Widefield ASKAP L-band Legacy All-sky Blind Survey (WALLABY) early science results from the Australian Square Kilometre Array Pathfinder (ASKAP) observations of the NGC 7162 galaxy group. We use archival HIPASS and Australia Telescope Compact Array (ATCA) observations of this group to validate the new ASKAP data and the data reduction pipeline ASKAP SOFT. We detect six galaxies in the neutral hydrogen (H I) 21-cm line, expanding the NGC 7162 group membership from four to seven galaxies. Two of the new detections are also the first H I detections of the dwarf galaxies, AM 2159-434 and GALEXASC J220338.65-431128.7, for which we have measured velocities of cz = 2558 and cz = 2727 km s–1, respectively. We confirm that there is extended H I emission around NGC 7162 possibly due to past interactions in the group as indicated by the 40° offset between the kinematic and morphological major axes for NGC 7162A, and its H I richness. Taking advantage of the increased resolution (factor of ∼1.5) of the ASKAP data over archival ATCA observations, we fit a tilted ring model and use envelope tracing to determine the galaxies' rotation curves. Using these we estimate the dynamical masses and find, as expected, high dark matter fractions of fDM ∼ 0.81-0.95 for all group members. The ASKAP data are publicly available.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): instrumentation: interferometers - telescopes - galaxies: distances and redshifts - galaxies: groups: general - galaxies: kinematics and dynamics - radio lines: galaxies

Nomenclature: Table 2: WALLABY JHHMMSS+DDMMSS N=6.

Simbad objects: 13

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Number of rows : 13
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 ICRF J193925.0-634245 Sy2 19 39 25.02671 -63 42 45.6255   18.87 18.37 17.64   ~ 1050 1
2 QSO B2106-413 QSO 21 09 33.18859195 -41 10 20.6053191   20.20 21.0 20.41   ~ 103 1
3 ESO 288-25 GiG 21 59 17.8142511773 -43 52 01.113547222   13.97   12.67   ~ 48 0
4 NGC 7162 GiP 21 59 39.0207984125 -43 18 22.097409345   13.36   12.36 12.8 ~ 56 0
5 [CHM2007] HDC 1172 GrG 21 59 50.08 -43 31 15.9           ~ 9 0
6 NGC 7166 GiP 22 00 32.922 -43 23 23.20   12.64 11.84 11.20   ~ 66 0
7 ESO 288-28 GiP 22 00 35.4 -43 08 28   13.54   12.64 13.3 ~ 47 0
8 ESO 288-33 G 22 02 07.01 -43 16 07.9   16.48       ~ 5 0
9 AM 2159-434 G 22 02 49.8 -43 26 41           ~ 2 0
10 LEDA 551930 G 22 03 38.6 -43 11 27           ~ 2 0
11 NGC 7232 GiP 22 15 38.0178364832 -45 51 00.417296906   12.58 11.79 11.00 11.9 ~ 54 0
12 IC 5201 G 22 20 57.437 -46 02 09.06   11.53   10.71 11.7 ~ 102 0
13 NAME Local Group GrG ~ ~           ~ 7429 0

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2021.11.28-22:39:09

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