The Color-Dependent Frequency of XUV Disks In Low-Mass E/S0s

Details The Color-Dependent Frequency of XUV Disks In Low-Mass E/S0s The Color-Dependent Frequency of XUV Disks In Low-Mass E/S0s

2010-09-08

arxiv.org/abs/1009.1437v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

2 pages, 1 figure, to appear in "A Universe of Dwarf Galaxies" conference proceedings

Scientific paper

We identify a high frequency of Type 1 XUV disks, reflecting recent outer disk star formation, in a sample of 31 E/S0s with stellar masses primarily below M_* ~ 4 x 10^10 M_sun. Our ~40% identification rate is roughly twice the 20% fraction reported for late-type galaxies. Intriguingly, in the dwarf mass regime (below M_* ~ 5 x 10^9 M_sun) where gas fractions clearly rise, Type 1 XUV disks occur in ~70% of red-sequence E/S0s but only ~20% of blue-sequence E/S0s, a population recently linked to active disk rebuilding, especially in the dwarf regime. Our statistics are preliminary, but could indicate that for dwarf E/S0s Type 1 XUV disks are primarily related to weak or inefficient outer-disk star formation rather than to star formation capable of driving substantial disk growth. Substantial growth may instead be associated with populations that have low XUV-disk frequency, possibly explaining the similar ~20% frequencies for normal late types and low-mass blue-sequence E/S0s.

Affiliated with

Also associated with

No associations

Rating

The Color-Dependent Frequency of XUV Disks In Low-Mass E/S0s 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 The Color-Dependent Frequency of XUV Disks In Low-Mass E/S0s, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Color-Dependent Frequency of XUV Disks In Low-Mass E/S0s will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-31595