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arXiv 0708.0886astro-ph
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斯皮策空间望远镜初视巡天的深u* 和g波段成像:观测和源目录

Deep u*- and g-band Imaging of the Spitzer Space Telescope First Look Survey Field : Observations and Source Catalogs

Hyunjin Shim, Myungshin Im, Soojong Pak, Phillip Choi, Dario Fadda, George Helou, Lisa Storrie-Lombardi

摘要:

我们目前深u*,和g波段的图像与MegaCam的3.6米加拿大-法国-夏威夷望远镜(CFHT),以支持斯皮策首次看调查(以下简称FLS)的河外部分。在本文中,我们概述的意见,目前的源目录和特点的完整性,可靠性,天体测量精度和数量的数据集。在FLS的中心1 deg 2区域,我们达到g~26.5 mag和u*~26.2 mag的深度(AB星等,在3”孔径上的5 $σ$检测),每个滤波器的曝光时间为~4小时。对于整个FLS区域(~5 ° 2覆盖),我们获得了u*=25.0- 25.4 mag(5 $σ$,3”孔径)的较浅深度的u* 带图像。观测的平均视宁度为0.85”(中心场)和~1.00”(其他场)。当与18<g<22之间的SDSS点源匹配时,对场的天体测量校准产生0.15”的绝对天体测量精度。源目录已使用SExtractor创建。星表的完整性为50%,可靠性大于99.3%,g~26.5 mag和u*~26.2 mag(中央1 deg 2磁场)。在较浅的u ~* 波段图像中,在24.8- 25.4磁等范围内,星表的完整性为50%,可靠性为98.2%,这些图像和源星表将为利用FLS数据研究星系演化提供有用的资源。

英文摘要:

We present deep u*-, and g-band images taken with the MegaCam on the 3.6 m Canada-France-Hawaii Telescope (CFHT) to support the extragalactic component of the Spitzer First Look Survey (hereafter, FLS). In this paper we outline the observations, present source catalogs and characterize the completeness, reliability, astrometric accuracy and number counts of this dataset. In the central 1 deg2 region of the FLS, we reach depths of g~26.5 mag, and u*~26.2 mag (AB magnitude, 5$σ$ detection over a 3" aperture) with ~4 hours of exposure time for each filter. For the entire FLS region (~5 deg2 coverage), we obtained u*-band images to the shallower depth of u*=25.0--25.4 mag (5$σ$, 3" aperture). The average seeing of the observations is 0.85" for the central field, and ~1.00" for the other fields. Astrometric calibration of the fields yields an absolute astrometric accuracy of 0.15" when matched with the SDSS point sources between 18<g<22. Source catalogs have been created using SExtractor. The catalogs are 50% complete and greater than 99.3% reliable down to g~26.5 mag and u*~26.2 mag for the central 1 deg2 field. In the shallower u*-band images, the catalogs are 50% complete and 98.2% reliable down to 24.8--25.4 mag. These images and source catalogs will serve as a useful resource for studying the galaxy evolution using the FLS data.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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