The Recent Formation of Low-Mass Galaxies in the Virgo Cluster

Details The Recent Formation of Low-Mass Galaxies in the Virgo Cluster The Recent Formation of Low-Mass Galaxies in the Virgo Cluster

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...19916012c&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #160.12; Bulletin of the American Astronomical Society, Vol. 34, p.571

Astronomy and Astrophysics

Astronomy

Scientific paper

We present evidence for recent evolution and/or formation of early-type low-mass cluster galaxies (LMCGs) in the Virgo cluster based on the results of an Arecibo HI and WIYN optical study. From a 21 cm survey of 22 Virgo LMCGs and a search of the literature, we find two new HI detections and seven previous claims of detection out a total of 48 Virgo objects classified as dwarf ellipticals (dEs) observed in 21 cm and confirmed as cluster members. For the non-detections we set upper limits on the HI masses down to ~ 4 x 105 Msun. All of the HI-detected objects are located in the outer parts of the cluster. These galaxies are also faint with an average absolute magnitude MB = -14.8, compared to MB = -16.4 for dEs without detections, similar to dwarf transition types in the very nearby universe. Structurally these LMCGs appear as either transition types, with morphologies between dwarf ellipticals and irregulars, or as pure dwarf ellipticals. We also find a general correlation between HI line width and magnitude for these objects, but with a slope much flatter than the Tully-Fisher or Faber-Jackson relationships and with a large scatter. We discuss the possible origins of these objects and conclude that they possibly originate from field galaxies that have recently accreted into Virgo and that have been transformed by cluster dynamical stripping processes over the last Gyr.

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