The neutral hydrogen content of Fornax cluster galaxies

Schroder, A., Drinkwater, M. J. and Richter, O. G. (2001) The neutral hydrogen content of Fornax cluster galaxies. Astronomy and Astrophysics, 376 1: 98-111. doi:10.1051/0004-6361:20010997


Author Schroder, A.
Drinkwater, M. J.
Richter, O. G.
Title The neutral hydrogen content of Fornax cluster galaxies
Journal name Astronomy and Astrophysics   Check publisher's open access policy
ISSN 1432-0746
0004-6361
Publication date 2001
Sub-type Article (original research)
DOI 10.1051/0004-6361:20010997
Open Access Status DOI
Volume 376
Issue 1
Start page 98
End page 111
Total pages 14
Place of publication Les Ulis, 91944 France
Publisher E D P Sciences
Language eng
Abstract We present a new set of deep H I observations of member galaxies of the Fornax cluster. We detected 35 cluster galaxies in H I. The resulting sample, the most comprehensive to date, is used to investigate the distribution of neutral hydrogen in the cluster galaxies. We compare the H I content of the detected cluster galaxies with that of field galaxies by measuring H I mass-to-light ratios and the H I deficiency parameter of Solanes et al. (1996). The mean H I mass-to-light ratio of the cluster galaxies is 0.68 +/- 0.15, significantly lower than for a sample of H I-selected field galaxies (1.15 +/- 0.10), although not as low as in the Virgo cluster (0.45 +/- 0.03). In addition, the H I content of two cluster galaxies (NGC1316C and NGC1326B) appears to have been affected by interactions. The mean H I deficiency for the cluster is 0.38 +/- 0.09 (for galaxy types T = 1-6), significantly greater than for the field sample (0.05 +/- 0.03). Both these tests show that Fornax cluster galaxies are H I-deficient compared to field galaxies. The kinematics of the cluster galaxies suggests that the H I deficiency may be caused by ram-pressure stripping of galaxies on orbits that pass close to the cluster core. We also derive the most complete B-band Tully-Fisher relation of inclined spiral galaxies in Fornax. A subcluster in the South-West of the main cluster contributes considerably to the scatter. The scatter for galaxies in the main cluster alone is 0.50 mag, which is slightly larger than the intrinsic scatter of 0.4 mag. We use the Tully-Fisher relation to derive a distance modulus of Fornax relative to the Virgo cluster of -0.38 +/- 0.14 mag. The galaxies in the subcluster are (1.0 +/- 0.5) mag brighter than the galaxies of the main cluster, indicating that they are situated in the foreground. With their mean velocity 95 km s(-1) higher than that of the main cluster we conclude that the subcluster is falling into the main Fornax cluster.
Keyword Astronomy & Astrophysics
Galaxies
Galaxies
Galaxies
Galaxies
Radio Lines
Extragalactic Distance Scale
Magnitude-limited Sample
Telescope Key Project
H-i Observations
Virgo Cluster
Spiral Galaxies
Peculiar Velocities
Global Parameters
Mass-distribution
Area
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Physical Sciences Publications
 
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Created: Mon, 13 Aug 2007, 12:30:37 EST