A Detailed Study of Photometric Redshifts for GOODS-South Galaxies

Details A Detailed Study of Photometric Redshifts for GOODS-South Galaxies A Detailed Study of Photometric Redshifts for GOODS-South Galaxies

2010-09-17

arxiv.org/abs/1009.3504v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

62 pages, 21 figures. Minor changes to match version to be published in ApJ

Scientific paper

We use the deepest and the most comprehensive photometric data currently available for GOODS-South galaxies to measure their photometric redshifts. The photometry includes VLT/VIMOS (U-band), HST/ACS (F435W, F606W, F775W, and F850LP bands), VLT/ISAAC (J-, H-, and Ks-bands), and four Spitzer/IRAC channels (3.6, 4.5, 5.8, and 8.0 micron). The catalog is selected in the z-band (F850LP) and photometry in each band is carried out using the recently completed TFIT algorithm, which performs PSF matched photometry uniformly across different instruments and filters, despite large variations in PSFs and pixel scales. Photometric redshifts are derived using the GOODZ code, which is based on the template fitting method using priors. The code also implements "training" of the template SED set, using available spectroscopic redshifts in order to minimize systematic differences between the templates and the SEDs of the observed galaxies. Our final catalog covers an area of 153 sq. arcmin and includes photometric redshifts for a total of 32,505 objects. The scatter between our estimated photometric and spectroscopic redshifts is sigma=0.040 with 3.7% outliers to the full z-band depth of our catalog, decreasing to sigma=0.039 and 2.1% outliers at a magnitude limit m(z)<24.5. This is consistent with the best results previously published for GOODS-S galaxies, however, the present catalog is the deepest yet available and provides photometric redshifts for significantly more objects to deeper flux limits and higher redshifts than earlier works. Furthermore, we show that the photometric redshifts estimated here for galaxies selected as dropouts are consistent with those expected based on the Lyman break technique.

Affiliated with

Also associated with

No associations

Rating

A Detailed Study of Photometric Redshifts for GOODS-South 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 A Detailed Study of Photometric Redshifts for GOODS-South Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Detailed Study of Photometric Redshifts for GOODS-South Galaxies will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-476434