Improved GALEX photometry of z<0.3 SDSS galaxies Virtual Observatory Resource

Authors
  1. Osborne C.
  2. Salim S.
  3. Boquien M.
  4. Dickinson M.
  5. Arnouts S.
  6. Published by
    CDS
Abstract

The Galaxy Evolution Explorer (GALEX) satellite performed the first and only large-area UV survey, which in tandem with the Sloan Digital Sky Survey (SDSS) has facilitated modeling of the spectral energy distributions of low-redshift galaxies and the determination of various galaxy properties, in particular the star formation rate. However, the relatively crude angular resolution of GALEX (5") made its images susceptible to blending of sources, resulting in potentially biased far-UV and near-UV (NUV) pipeline photometry. To remedy this issue and take advantage of model-fit photometry, we use the EMphot software to obtain forced GALEX photometry for ~700000 SDSS galaxies at z<0.3. Positional priors of target galaxies and potentially contaminating neighbors were taken from SDSS. New photometry is based on the best-fitting of three model profiles: optical-like, exponential, and flat. New photometry mitigates blending present in the original pipeline catalogs, which affected 16% of galaxies at a level of >0.2mag and 2% at a level of >1mag. Pipeline NUV magnitudes are severely affected (>~1mag) when the neighbor is brighter than the target galaxy and within 10", or when the neighbor is fainter and within ~3" of the target. New photometry fixes edge-of-detector bias, which affected pipeline photometry by up to 0.1mag in NUV. We present catalogs with new photometry for GALEX observations of different depths, corresponding to the all-sky imaging survey (AIS), medium imaging survey, and deep imaging survey. Catalogs feature combined magnitudes for multiple detections of the same galaxy in a survey.

Keywords
  1. galaxies
  2. photometry
  3. ultraviolet-astronomy
  4. visible-astronomy
Bibliographic source Bibcode
2023ApJS..268...26O
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/268/26
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJS/268/26
Document Object Identifer DOI
doi:10.26093/cds/vizier.22680026

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/268/26
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/268/26
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/268/26
IVOA Table Access TAP
http://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/268/26/gswlcais?
https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/268/26/gswlcais?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/268/26/gswlcais?
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/268/26/gswlcmis?
https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/268/26/gswlcmis?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/268/26/gswlcmis?
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/268/26/gswlcdis?
https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/268/26/gswlcdis?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/268/26/gswlcdis?
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/268/26/gswlcx?
https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/268/26/gswlcx?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/268/26/gswlcx?

History

2024-01-09T10:27:13Z
Resource record created
2024-01-09T10:27:13Z
Created
2024-06-26T20:14:20Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr