2003A&A...409..879B


Query : 2003A&A...409..879B

2003A&A...409..879B - Astronomy and Astrophysics, volume 409, 879-886 (2003/10-3)

Kinematics of the dwarf irregular galaxy GR8.

BEGUM A. and CHENGALUR J.N.

Abstract (from CDS):

We present deep, high velocity resolution (∼1.6km/s) Giant Meterwave Radio Telescope HI 21cm synthesis images for the faint (MB~-12.1) dwarf irregular galaxy GR8. We find that the velocity field of the galaxy shows a clear systematic large scale pattern, with a maximum amplitude ∼10km/s. Neither pure rotation, nor pure radial motion alone can fit the observed velocity field; however a combination of radial and circular motions can provide a reasonable fit. The most natural interpretation is that the neutral ISM, in addition to rotating about the center, is also expanding outwards, as a result of energy input from the ongoing star formation in the galaxy. Support for this interpretation comes from the fact that the pressure in the HII regions in the galaxy is known to be substantially (∼55 times) higher than the average pressure in the gas disk. It is, however, also possible that the velocity field is the result of the gas swirling inwards, in which case GR8 could be in the process of formation via the merger of subgalactic clumps.

Abstract Copyright:

Journal keyword(s): galaxies: evolution - galaxies: dwarf - galaxies: kinematics and dynamics - galaxies: individual: GR8 - radio lines: galaxies

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 UGC 4305 IG 08 19 04.9864630512 +70 43 13.086910452 12.06 11.72 11.39 11.11   ~ 743 2
2 UGC 5139 LSB 09 40 32.33 +71 10 56.0 14.53 14.00 13.66 13.41   ~ 347 1
3 IC 2574 G 10 28 23.6148831408 +68 24 43.440012756 11.70 11.07 10.87 10.74   ~ 641 1
4 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6377 0
5 UGC 8091 H2G 12 58 40.1930636208 +14 13 00.739589628 15.24 15.16 14.98 14.81   ~ 453 0

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2023.01.27-11:32:57

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