2014A&A...567A..56S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST22:40:25

2014A&A...567A..56S - Astronomy and Astrophysics, volume 567A, 56-56 (2014/7-1)

A ∼ 12 kpc H I extension and other H I asymmetries in the isolated galaxy CIG 340 (IC 2487).

SCOTT T.C., SENGUPTA C., VERDES MONTENEGRO L., BOSMA A., ATHANASSOULA E., SULENTIC J., ESPADA D., YUN M.S. and ARGUDO-FERNANDEZ M.

Abstract (from CDS):

HI kinematic asymmetries are common in late-type galaxies irrespective of environment, although the amplitudes are strikingly low in isolated galaxies. As part of our studies of the HI morphology and kinematics in isolated late-type galaxies we have chosen several very isolated galaxies from the AMIGA sample for HI mapping. We present here the results of HI mapping of CIG340 (IC 2487) which was selected because its integrated HI spectrum has a very symmetric profile (Aflux=1.03±0.02). Optical images of the galaxy hinted at a warped disk in contrast to the symmetric integrated HI spectrum profile. Our aim is to determine the extent to which the optical asymmetry is reflected in the resolved HI morphology and kinematics. Resolved 21-cm HI line mapping has been carried out using the Giant Metrewave Radio Telescope (GMRT). The HI morphology and kinematics from this mapping together with other multi-wavelength data have been used to study the relationship between the HI and stellar components of CIG340. GMRT observations reveal significant HI morphological asymmetries in CIG340 despite it's overall symmetric optical form and highly symmetric HI spectrum. The most notable HI features are: 1) a warp in the HI disk (with an optical counterpart), 2) the HI north/south flux ratio = 1.32 is much larger than expected from the integrated HI spectrum profile, and 3) a ∼45'' (12kpc) HI extension containing ∼6% of the detected HI mass on the northern side of the disk. Overall, we conclude that in isolated galaxies a highly symmetric HI spectrum can mask significant HI morphological asymmetries which can be revealed by HI interferometric mapping. The northern HI extension appears to be the result of a recent perturbation (108yr), possibly by a satellite which is now disrupted or projected within the disk. But, we cannot rule out that the HI extension and the other observed asymmetries are the result of a long lived dark matter halo asymmetry. This study provides an important step in our ongoing programme to determine the predominant source of HI asymmetries in isolated galaxies. For CIG340 the isolation from major companions, symmetric HI spectrum, optical morphology and interaction timescales have allowed us to narrow the possible causes the HI asymmetries and identify tests to further constrain the source of the asymmetries.

Abstract Copyright:

Journal keyword(s): galaxies: individual: CIG 340 (IC 2487) - galaxies: ISM - radio lines: galaxies

VizieR on-line data: <Available at CDS (J/A+A/567/A56): list.dat fits/*>

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 UGC 1547 G 02 03 20.32 +22 02 28.8   15.00       ~ 46 0
2 NGC 864 H2G 02 15 27.641 +06 00 09.43   12.00       ~ 202 1
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14826 1
4 ICRF J054236.1+495107 Sy1 05 42 36.13789843 +49 51 07.2337251   18.45 17.80 17.210   ~ 1266 1
5 QSO B0839+187 QSO 08 42 05.09417058 +18 35 40.9905528   16.63 16.36 16.56   ~ 164 2
6 NGC 2712 G 08 59 30.458 +44 54 50.40   12.30       ~ 152 0
7 IC 2487 EmG 09 30 09.188 +20 05 27.29   14.20       ~ 63 0
8 MCG+03-24-062 GiG 09 30 22.9832999194 +19 28 09.768080412   15.30       ~ 33 0
9 2MASX J09344073+1933009 GiG 09 34 40.7584295094 +19 33 01.025356397   15.2       ~ 12 0
10 ICRF J111120.0+195536 Sy2 11 11 20.06576034 +19 55 36.0002856   18.5 18.5     ~ 46 1
11 NGC 4013 GiG 11 58 31.417 +43 56 49.28   12.4       ~ 364 1

    Equat.    Gal    SGal    Ecl

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2020.07.03-22:40:25

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