Mathematics – Logic
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21545103k&link_type=abstract
American Astronomical Society, AAS Meeting #215, #451.03; Bulletin of the American Astronomical Society, Vol. 42, p.460
Mathematics
Logic
Scientific paper
Early-type dwarf galaxies dominate cluster populations, but their formation and evolutionary histories are poorly understood. The ALFALFA (Arecibo Legacy Fast ALFA) blind survey is providing a census of HI in galaxies of all types in a range of environments. Here we report ALFALFA and follow-up H-alpha imaging results for Virgo Cluster early-type dwarfs at declinations between 4 and 16 degrees. Less than 2% of the Virgo early-type dwarf population is detected, a significantly lower fraction than reported in previous papers based on more limited samples. In contrast, 70-80% of the Im/BCD dwarf population is detected. Most of the dwarfs detected in HI are also detected in H-alpha, indicating recent star formation. Early-type galaxies with HI tend to be located in the outer regions of the cluster and to be brighter. Early-type dwarfs with HI may be undergoing morphological transition due to cluster environmental effects. This work has been supported by NSF grant AST-0724918.
Brosch Noah
Giovanelli Riccardo
Haynes Martha P.
Kent Brian R.
Koopmann Rebecca A.
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