Number Counts of GALEX Sources in FUV (1530A) and NUV (2310A) Bands

Details Number Counts of GALEX Sources in FUV (1530A) and NUV (2310A) Bands Number Counts of GALEX Sources in FUV (1530A) and NUV (2310A) Bands

2004-11-12

arxiv.org/abs/astro-ph/0411317v1

Astrophys.J. 619 (2005) L11-L14

Astronomy and Astrophysics

Astrophysics

This paper will be published as part of the Galaxy Evolution Explorer (GALEX) Astrophysical Journal Letters Special Issue. Lin

Scientific paper

10.1086/425252

Number Counts of galaxies in two GALEX bands (FUV: 1530A and NUV: 2310A, both in AB magnitudes) are reported. They provide for the first time in the literature homogeneously calibrated number counts of UV galaxies covering continuously a very wide range of UV magnitude (14 -- 23.8). Both the FUV and NUV counts are inconsistent with a non-evolution model, while they are in good agreement with evolution models (essentially luminosity evolution) derived from the high-z UV luminosity functions of Arnouts et al. (2004). It is found that the contribution from galaxies detected by GALEX to the UV background is 0.68+-0.10 nW m-2 sr-1 at 1530A and 0.99+-0.15 nW m-2 sr-1 at 2310A. These are 66+-9% and 44+-6% of the total contributions of galaxies to the the UV background at 1530A, respectively, as estimated using the evolution models. ...

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