Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aj....124..777e&link_type=abstract
The Astronomical Journal, Volume 124, Issue 2, pp. 777-781.
Astronomy and Astrophysics
Astronomy
16
Galaxies: Clusters: Individual: Name: Virgo, Galaxies: Evolution, Galaxies: Spiral, Galaxies: Structure
Scientific paper
Anemic galaxies have less prominent star formation than normal galaxies of the same Hubble type. Previous studies showed they are deficient in total atomic hydrogen but not in molecular hydrogen. Here we compare the combined surface densities of H I and H2 at mid-disk radii with the Kennicutt threshold for star formation. The anemic galaxies are below the threshold, which explains their lack of prominent star formation, but they are not much different than other early-type galaxies, which also tend to be below threshold. The spiral wave amplitudes of anemic and normal galaxies were also compared, using images in B and J passbands from the OSU Bright Spiral Galaxy Survey. Anemic galaxies have normal spiral wave properties too, with the same amplitudes and radial dependencies as other galaxies of the same arm class. Because of the lack of gas, spiral waves in early-type galaxies and anemics do not have a continuous supply of stars with low velocity dispersions to maintain a marginally stable disk. As a result, they are either short lived, evolving toward lenticulars and S0 types in only a few rotations at mid-disk, or they are driven by the asymmetries associated with gas removal in the cluster environment.
Elmegreen Bruce G.
Elmegreen Debra Meloy
Eskridge Paul B.
Frogel Jay. A.
Gallagher Andrew
No associations
LandOfFree
Arm Structure in Anemic Spiral Galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Arm Structure in Anemic Spiral Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Arm Structure in Anemic Spiral Galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1674663