A complete microjansky radio survey

被引:4
作者
Afonso, J
Mobasher, B
Hopkins, A
Cram, L
机构
[1] Univ London Imperial Coll Sci Technol & Med, Blackett Lab, Astrophys Grp, London SW7 2BZ, England
[2] Australia Telescope Natl Facil, Epping, NSW 1710, Australia
[3] Univ Sydney, Sch Phys, Dept Astrophys, Sydney, NSW 2006, Australia
关键词
D O I
10.1023/A:1017578920588
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The Phoenix Deep Survey is an ongoing multi-wavelength survey of a 2 degrees diameter field aimed at studying the properties of the sub-mJy and mu Jy radio population. Here, we present the latest 1.4 GHz observations of this field. The new data, reaching a 5 sigma flux level of 45 mu Jy at the centre of a 50' diameter field, comprise more than 700 sources with flux densities less than 1 mJy (187 of which have S-1.4 < 100 mu Jy). This provides one of the deepest radio (1.4 GHz) surveys currently available. The 1.4 GHz source counts are presented and show a flattening down to the 50 mu Jy level. At flux densities around 300 mu Jy there are indications that the sources detected may exhibit higher clustering than those observed at higher flux levels. This suggests that deep radio surveys could be useful for studies of large-scale structure but it also presents a warning for the representativity of sources in deep pencil-beam radio surveys. The study of the optical counterparts of the mu Jy population seems to indicate that the median R magnitude starts to decrease below 100 mu Jy. Spectroscopic classification of a sample of sources in this survey confirms the trend for an increasing fraction of star-forming galaxies over other systems down to similar to 100 mu Jy.
引用
收藏
页码:941 / 948
页数:8
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