0<z<1范围内圆盘半导体近紫外辐射通量的径向分布
Radial Distribution of Near-UV Flux in Disc Galaxies in the range 0<z<1
摘要：
本文的目的是定量地研究盘星系在最后8 Gyr内SF分布的变化。我们使用的SF径向轮廓的近紫外线表面亮度分布的代理，允许适当的消光。我们比较了0<z<1范围内270个星系的有效半径（R_eff）和静止系近紫外区的通量分布浓度。这种径向分布进行比较，在休息帧B带，跟踪老恒星星族的测量。分析使用来自GALEX、SDSS和HST/ACS-GOODS-South的深、高分辨率、多波段图像进行。R_eff（NUV）- M* 的关系在z~1和z~0之间有一个适度的变化：当恒星质量为1 E10 M_sun时，星系的有效半径增加了1.18+/-0.06倍。NUV中的中值分布在R~R_eff处显示出截断的迹象，并且中值颜色分布（NUV-B）也在R~1- 1.5R_eff附近显示出最小值（“最蓝”点）。在z~1处，NUV通量的分布比现在更紧凑，就特定半径（以kpc为单位）中所包含的通量的分数而言。我们的结果表明，自z~1以来，星系盘中的SF面密度急剧下降，并且这种下降在星系的中心部分（<~R_eff）更为剧烈。此外，我们的数据表明，凸起/伪凸起的表面亮度增长的光盘，因为z~1。
英文摘要：
(Abridged) The goal of this paper is to quantify the changes on the SF distribution within the disc galaxies in the last ~8 Gyr. We use as a proxy for the SF radial profile the Near-UV surface brightness distributions, allowing suitably for extinction. We compare the effective radii (R_eff) and concentration of the flux distribution in the rest-frame Near-UV for a sample of 270 galaxies in the range 0<z<1. This radial distribution is compared to that measured in the rest-frame B-band, which traces older stellar populations. The analysis is performed using deep, high resolution, multi-band images from GALEX, SDSS, and HST/ACS - GOODS-South. The relation R_eff(NUV)- M* suffers a moderate change between z~1 and z~0: at a fixed stellar mass of 1E10 M_sun, galaxies increase their effective radii by a factor 1.18+/-0.06. Median profiles in NUV show signs of truncation at R~R_eff, and median colour profiles (NUV-B) show a minimum (a "bluest" point) also around R~1-1.5 R_eff. The distributions of NUV flux are more compact at z~1 than nowadays, in terms of the fraction of flux enclosed in a specific radius (in kpc). Our results indicate that the SF surface density has decreased dramatically in discs since z~1, and this decline has been more intense in the central parts (<~R_eff) of the galaxies. In addition, our data suggest that the bulges/pseudo-bulges have grown in surface brightness with regard to the discs since z~1.
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