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An application of multi-band forced photometry to one square degree of SERVS: accurate photometric redshifts and implications for future science
- Source :
- CIÊNCIAVITAE, The Astrophysical Journal Supplement Series, The Astrophysical Journal Supplement Series, IOPscience 2017, 230 (1), pp.9. ⟨10.3847/1538-4365/aa6fed⟩, Astrophys.J.Suppl., Astrophys.J.Suppl., 2017, 230 (1), pp.9. ⟨10.3847/1538-4365/aa6fed⟩, Astrophys.J.Suppl., 2017, 230 (1), pp.9. 〈10.3847/1538-4365/aa6fed〉, NASA Astrophysics Data System
- Publication Year :
- 2017
- Publisher :
- American Astronomical Society, 2017.
-
Abstract
- We apply The Tractor image modeling code to improve upon existing multi-band photometry for the Spitzer Extragalactic Representative Volume Survey (SERVS). SERVS consists of post-cryogenic Spitzer observations at 3.6 and 4.5 micron over five well-studied deep fields spanning 18 square degrees. In concert with data from ground-based near-infrared (NIR) and optical surveys, SERVS aims to provide a census of the properties of massive galaxies out to z ~ 5. To accomplish this, we are using The Tractor to perform "forced photometry." This technique employs prior measurements of source positions and surface brightness profiles from a high-resolution fiducial band from the VISTA Deep Extragalactic Observations (VIDEO) survey to model and fit the fluxes at lower-resolution bands. We discuss our implementation of The Tractor over a square degree test region within the XMM-LSS field with deep imaging in 12 NIR/optical bands. Our new multi-band source catalogs offer a number of advantages over traditional position-matched catalogs, including 1) consistent source cross-identification between bands, 2) de-blending of sources that are clearly resolved in the fiducial band but blended in the lower-resolution SERVS data, 3) a higher source detection fraction in each band, 4) a larger number of candidate galaxies in the redshift range 5 < z < 6, and 5) a statistically significant improvement in the photometric redshift accuracy as evidenced by the significant decrease in the fraction of outliers compared to spectroscopic redshifts. Thus, forced photometry using The Tractor offers a means of improving the accuracy of multi-band extragalactic surveys designed for galaxy evolution studies. We will extend our application of this technique to the full SERVS footprint in the future.<br />accepted to ApJ, 22 pages, 12 figures
- Subjects :
- [ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph]
FOS: Physical sciences
techniques: image processing
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
01 natural sciences
Photometry (optics)
surveys
0103 physical sciences
Range (statistics)
Galaxy formation and evolution
Surface brightness
[PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det]
Instrumentation and Methods for Astrophysics (astro-ph.IM)
[ PHYS.PHYS.PHYS-INS-DET ] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det]
010303 astronomy & astrophysics
Astrophysics::Galaxy Astrophysics
Photometric redshift
Physics
010308 nuclear & particles physics
Galaxies: evolution
Astronomy and Astrophysics
Astrophysics - Astrophysics of Galaxies
methods: data analysis
Galaxy
Redshift
Space and Planetary Science
Astrophysics of Galaxies (astro-ph.GA)
Astrophysics - Instrumentation and Methods for Astrophysics
Fiducial marker
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
catalogs
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- CIÊNCIAVITAE, The Astrophysical Journal Supplement Series, The Astrophysical Journal Supplement Series, IOPscience 2017, 230 (1), pp.9. ⟨10.3847/1538-4365/aa6fed⟩, Astrophys.J.Suppl., Astrophys.J.Suppl., 2017, 230 (1), pp.9. ⟨10.3847/1538-4365/aa6fed⟩, Astrophys.J.Suppl., 2017, 230 (1), pp.9. 〈10.3847/1538-4365/aa6fed〉, NASA Astrophysics Data System
- Accession number :
- edsair.doi.dedup.....3c9a7f22b412484f8526cf5d3fe2ea3b