GALEX紫外室女室女星系团巡天（GUViCS）。V.室女星系团方向的紫外漫发射和卷云特性
The GALEX Ultraviolet Virgo Cluster Survey (GUViCS). V. Ultraviolet diffuse emission and cirrus properties in the Virgo cluster direction
摘要：
背景：近年来，在许多波长上都观测到了室女座方向，特别是在GALEX的紫外线上。GALEX探测到的远紫外（FUV）漫射光具有关于银河系尘埃大尺度分布的有趣信息，这是由于GALEX FUV波段的灵敏度和分辨率。目的：研究室女座方向紫外漫发射的大尺度分布。通过确定尘埃通过散射光或吸收辐射影响观测的区域，这种发射的地图可能对各种研究有用。方法：我们构建了一个大的天空区域（RA 12至13小时，12月0日至20度）周围的室女星系团的FUV和近紫外漫发射的马赛克，使用所有的GALEX可用的数据在该地区。我们首次测试利用FUV漫射光作为银河系消光E（B-V）示踪剂。结果：FUV漫散射光在卷云上显示了卷云的几何细节。尽管分散度很大，但FUV漫射光与其他银河系尘埃示踪剂（来自IRAS，Herschel，Planck）大致相关，提供了一个机会，可以在未来的研究中使用FUV发射来定位它们，其分辨率比几种常见的示踪剂更好（约5 arcsec的原生分辨率，本文中提供的20 arcsec像素地图）。估计银河系尘埃消光的基础上，这种排放使我们能够找到一个较小的分散在NUV-i颜色的背景星系在给定的E（B-V）比其他示踪剂。在这项工作中获得的漫射光马赛克是公开的。
英文摘要：
CONTEXT: The Virgo direction has been observed at many wavelengths in the recent years, in particular in the ultraviolet with GALEX. The far ultraviolet (FUV) diffuse light detected by GALEX bears interesting information on the large scale distribution of Galactic dust, owing to the GALEX FUV band sensitivity and resolution. AIMS: We aim to characterise the ultraviolet large scale distribution of diffuse emission in the Virgo direction. A map of this emission may become useful for various studies by identifying regions where dust affects observations by either scattering light or absorbing radiation. METHODS: We construct mosaics of the FUV and near ultraviolet diffuse emission over a large sky region (RA 12 to 13 hours, DEC 0 to 20 degrees) surrounding the Virgo cluster, using all the GALEX available data in the area. We test for the first time the utilisation of the FUV diffuse light as a Galactic extinction E(B-V) tracer. RESULTS: The FUV diffuse light scattered on cirrus reveals details in their geometry. Despite a large dispersion, the FUV diffuse light correlates roughly with other Galactic dust tracers (coming from IRAS, Herschel, Planck), offering an opportunity to use the FUV emission to locate them in future studies with a better resolution (about 5 arcsec native resolution, 20 arcsec pixels maps presented in this paper) than several usual tracers. Estimating the Galactic dust extinction on the basis of this emission allows us to find a smaller dispersion in the NUV-i colour of background galaxies at a given E(B-V)than with other tracers. The diffuse light mosaics obtained in this work are made publicly available.
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