Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-11-13
Astronomy and Astrophysics
Astrophysics
10 pages, 8 figures, accepted 3 November 2007 for publication in The Astronomical Journal, formatted with emulateapj style
Scientific paper
10.1088/0004-6256/135/3/1050
This paper presents galaxy source counts at 24 microns in the six Spitzer Wide-field InfraRed Extragalactic (SWIRE) fields. The source counts are compared to counts in other fields, and to model predictions that have been updated since the launch of Spitzer. This analysis confirms a very steep rise in the Euclidean-normalized differential number counts between 2 mJy and 0.3 mJy. Variations in the counts between fields show the effects of sample variance in the flux range 0.5-10 mJy, up to 100% larger than Poisson errors. Nonetheless, a "shoulder" in the normalized counts persists at around 3 mJy. The peak of the normalized counts at 0.3 mJy is higher and narrower than most models predict. In the ELAIS N1 field, the 24 micron data are combined with Spitzer-IRAC data and five-band optical imaging, and these bandmerged data are fit with photometric redshift templates. Above 1 mJy the counts are dominated by galaxies at z less than 0.3. By 300 microJy, about 25% are between z ~ 0.3-0.8, and a significant fraction are at z ~ 1.3-2. At low redshifts the counts are dominated by spirals, and starbursts rise in number density to outnumber the spirals' contribution to the counts below 1 mJy.
Babbedge Thomas
Berta Stefano
Evans Tracey
Fang Fan
Farrah Duncan
No associations
LandOfFree
Galaxy Counts at 24 Microns in the SWIRE Fields 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 Galaxy Counts at 24 Microns in the SWIRE Fields, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Galaxy Counts at 24 Microns in the SWIRE Fields will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-271551