2016A&A...587L...3C


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.31CEST00:05:25

2016A&A...587L...3C - Astronomy and Astrophysics, volume 587, L3-3 (2016/3-1)

HI observations of two new dwarf galaxies: Pisces A and B with the SKA Pathfinder KAT-7.

CARIGNAN C., LIBERT Y., LUCERO D.M., RANDRIAMAMPANDRY T.H., JARRETT T.H., OOSTERLOO T.A. and TOLLERUD E.J.

Abstract (from CDS):

Pisces A and Pisces B are the only two galaxies found via optical imaging and spectroscopy out of 22 HI clouds identified in the GALFAHI survey as dwarf galaxy candidates. We derive the HI content and kinematics of Pisces A and B. Our aperture synthesis HI observations used the seven-dish Karoo Array Telescope (KAT-7), which is a pathfinder instrument for MeerKAT, the South African precursor to the mid-frequency Square Kilometre Array (SKA-MID). The low rotation velocities of ∼5km/s and ∼10km/s in Pisces A and B, respectively, and their HI content show that they are really dwarf irregular galaxies (dIrr). Despite that small rotation component, it is more the random motions ∼9-11km/s that provide most of the gravitational support, especially in the outer parts. The study of their kinematics, especially the strong gradients of random motions, suggest that those two dwarf galaxies are not yet in equilibrium. These HI-rich galaxies may be indicative of a large population of dwarfs at the limit of detectability. However, such gas-rich dwarf galaxies will most likely never be within the virial radius of MW-type galaxies and become subhalo candidates. Systems such as Pisces A and B are more likely to be found at a few Mpcs from MW-type galaxies.

Abstract Copyright:

Journal keyword(s): galaxies: dwarf - galaxies: individual: Pisces A - galaxies: individual: Pisces B - ISM: kinematics and dynamics - galaxies: kinematics and dynamics

VizieR on-line data: <Available at CDS (J/A+A/587/L3): list.dat fits/*>

Status at CDS:  

Simbad objects: 11

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Number of rows : 11

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 [SPG2012] 003.7+10.8+236 G 00 14 46.000 +10 48 47.01           ~ 13 0
2 ICRF J002225.4+001456 BiC 00 22 25.42593021 +00 14 56.1613786   21.1       ~ 99 1
3 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10851 1
4 [SPG2012] 019.8+11.1+617 G 01 19 11.700 +11 07 18.22           ~ 11 0
5 NAME M 81 Dwarf A G 08 23 55.1 +71 01 56   16.5       ~ 186 1
6 NAME Leo T dSph G 09 34 53.4 +17 03 05     15.1     ~ 305 0
7 NAME Leo P BiC 10 21 45.123 +18 05 16.89           ~ 149 0
8 UGC 8091 H2G 12 58 40.1930291852 +14 13 00.737117016 15.24 15.16 14.98 14.81   ~ 437 0
9 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2534 2
10 ICRF J193925.0-634245 Sy2 19 39 25.02671 -63 42 45.6255   18.87 18.37 17.64   ~ 945 1
11 NAME Local Group GrG ~ ~           ~ 6923 0

    Equat.    Gal    SGal    Ecl

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2020.05.31-00:05:25

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