Number Counts of GALEX Sources in Far-Ultraviolet (1530 Å) and Near-Ultraviolet (2310 Å) Bands
Number Counts of GALEX Sources in Far-Ultraviolet (1530 Å) and Near-Ultraviolet (2310 Å) Bands
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远紫外 (1530 Å) 和近紫外 (2310 Å) 波段 GALEX 光源的计数
DOI：
10.1086/425252
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
B. Welsh
中科院分区：
文献类型：
--
作者：
C. K. Xu;J. Donas;S. Arnouts;T. Wyder;M. Seibert;J. Iglesias;J. Blaizot;T. Small;B. Milliard;D. Schiminovich;D. C. Martin;T. Barlow;L. Bianchi;Y. Byun;K. Forster;P. Friedman;T. Heckman;P. Jelinsky;Young;B. F. Madore;B. F. Madore;R. Malina;P. Morrissey;S. Neff;R. Rich;O. Siegmund;A. Szalay;B. Welsh
报告了星系演化探测器（GALEX）两个波段[远紫外（FUV：1530 nm）和近紫外（NUV：2310 nm）;都是AB星等]的星系数量。他们提供了第一次在文献中均匀校准数计数的紫外线星系连续覆盖一个非常广泛的范围内的紫外线星等（14-23.8）。FUV和NUV计数都与非进化模型不一致，然而，它们与进化模型非常一致，我们发现GALEX探测到的星系对紫外背景的贡献在1530 nm处为0.68 ± 0.10 nW m-2 sr-1，在1530 nm处为0.99 ± 0.15 nW m-2 sr-1。1在2310度。根据演化模型的估计，这些分别是星系对1530 nm（1.03 ± 0.15 nW m-2 sr-1）和2310 nm（2.25 ± 0.32 nW m-2 sr-1）紫外背景总贡献的66% ± 9%和44% ± 6%。星系计数和星星计数在7个区域，每个区域包含几个平方度的GALEX覆盖范围在4-13 deg 2的区域，相互比较，研究区域的区域差异。这表明，对于星系计数，宇宙方差与其他不确定性引起的净误差相当。星星的数量随着银河系绝对纬度的降低而增加|B|.
Number counts of galaxies in two Galaxy Evolution Explorer (GALEX) bands [far-UV (FUV: 1530 Å) and near-UV (NUV: 2310 Å); both in AB magnitudes] are reported. They provide for the first time in the literature homogeneously calibrated number counts of UV galaxies continuously covering a very wide range in UV magnitude (14-23.8). Both the FUV and NUV counts are inconsistent with a nonevolution model, whereas they are in good agreement with evolution models (essentially luminosity evolution) derived from the high-z UV luminosity functions of Arnouts et al. We find that the contribution from GALEX-detected galaxies to the UV background is 0.68 ± 0.10 nW m-2 sr-1 at 1530 Å and 0.99 ± 0.15 nW m-2 sr-1 at 2310 Å. These are 66% ± 9% and 44% ± 6% of the total contributions of galaxies to the UV background at 1530 Å (1.03 ± 0.15 nW m-2 sr-1) and at 2310 Å (2.25 ± 0.32 nW m-2 sr-1), respectively, as estimated using the evolution models. Galaxy counts and star counts in seven regions, each containing a few square degrees of GALEX coverage in an area of ~4-13 deg2, are compared with each other to study the region-by-region variance. This shows that for the galaxy counts, the cosmic variance is comparable to the net error due to other uncertainties. The star counts increase with decreasing absolute Galactic latitude |b|.