- LandOfFree
- Scientists
- Astronomy and Astrophysics
- Astrophysics
Details
H-alpha Observations of a Large Sample of Galaxies at z~2: Implications
for Star Formation in High Redshift Galaxies
H-alpha Observations of a Large Sample of Galaxies at z~2: Implications
for Star Formation in High Redshift Galaxies
2006-04-18
-
arxiv.org/abs/astro-ph/0604388v1
Astrophys.J.647:128-139,2006
Astronomy and Astrophysics
Astrophysics
14 pages, 7 figures, 1 table. Accepted for publication in ApJ
Scientific paper
10.1086/505341
Using H-alpha spectra of 114 rest-frame UV-selected galaxies at z~2, we compare inferred star formation rates (SFRs) with those determined from the UV continuum luminosity. After correcting for extinction using standard techniques based on the UV continuum slope, we find excellent agreement between the indicators, with = 31 Msun/yr and = 29 Msun/yr. The agreement between the indicators suggests that the UV luminosity is attenuated by an typical factor of ~4.5 (with a range from no attenuation to a factor of ~100 for the most obscured object in the sample), in good agreement with estimates of obscuration from X-ray, radio and mid-IR data. The H-alpha luminosity is attenuated by a factor of ~1.7 on average, and the maximum H-alpha attenuation is a factor of ~5. In agreement with X-ray and mid-IR studies, we find that the SFR increases with increasing stellar mass and at brighter K magnitudes, to ~ 60 Msun/yr for galaxies with K<20; the correlation between K magnitude and SFR is much stronger than the correlation between stellar mass and SFR. All galaxies in the sample have SFRs per unit area Sigma_SFR in the range observed in local starbursts. We compare the instantaneous SFRs and the past average SFRs as inferred from the ages and stellar masses, finding that for most of the sample, the current SFR is an adequate representation of the past average. There is some evidence that the most massive galaxies (M_star >10^11 Msun) have had higher SFRs in the past.
Affiliated with
Also associated with
No associations
LandOfFree
Say what you really think
Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.
Rating
H-alpha Observations of a Large Sample of Galaxies at z~2: Implications
for Star Formation in High Redshift 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 H-alpha Observations of a Large Sample of Galaxies at z~2: Implications
for Star Formation in High Redshift Galaxies, we encourage you to share that experience with our LandOfFree.com community.
Your opinion is very important and H-alpha Observations of a Large Sample of Galaxies at z~2: Implications
for Star Formation in High Redshift Galaxies will most certainly appreciate the feedback.
Rate now
Profile ID: LFWR-SCP-O-236623
All data on this website is collected from public sources.
Our data reflects the most accurate information available at the time of publication.