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arXiv 1107.4979astro-ph.CO
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z=2.3时强透镜Herschel-ATLAS源中H2O的观测

Observation of H2O in a strongly lensed Herschel-ATLAS source at z=2.3

A. Omont, R. Neri, P. Cox, R. Lupu, M. Guélin, P. van der Werf, A. Weiß, R. Ivison, M. Negrello, L. Leeuw, M. Lehnert, I. Smail, A. Beelen, J. E. Aguirre, M. Ba… 展开作者

A. Omont, R. Neri, P. Cox, R. Lupu, M. Guélin, P. van der Werf, A. Weiß, R. Ivison, M. Negrello, L. Leeuw, M. Lehnert, I. Smail, A. Beelen, J. E. Aguirre, M. Baes, F. Bertoldi, D. L. Clements, A. Cooray, K. Coppin, H. Dannerbauer, G. De Zotti, S. Dye, N. Fiolet, D. Frayer, R. Gavazzi, D. Hughes, M. Jarvis, M. Krips, M. Micha lowski, E. Murphy, D. Riechers, A. M. Swinbank, P. Temi, M. Vaccari, A. Verma, J. D. Vieira, R. Auld, B. Buttiglione, A. Cava, A. Dariush, L. Dunne, S. A. Eales, J. Fritz, H. Gomez, E. Ibar, S. Maddox, E. Pascale, M. Pohlen, E. Rigby, D. Smith, A. J. Baker, J. Bock, C. M. Bradford, J. Glenn, A. I. Harris, K. S. Scott, J. Zmuidzinas

摘要:

Herschel巡天H-ATLAS以其大面积的覆盖范围,最近发现了一些明亮的,强透镜的高z亚毫米星系。强大的放大倍率使得研究CO以外的分子种类成为可能,否则很难在高z星系中观察到。在H-ATLAS已经识别的透镜星系中,z = 2.305的源J090302.9- 014127 B(SDP.17b)由于其激发条件和H2O 202-111发射线的试探性检测而引人注目(Lupu et al. 2010)。我们在SDP.17b中使用配备新的277- 371 GHz接收器的IRAM干涉仪报告了这条线的观测结果。H2O线的红移为z = 2.3049+/-0.0006,通量为7.8+/-0.5 Jy km s-1,半高宽为250+/-60 km s-1。新的通量是2.4倍弱于以前的试探性检测,虽然两者都保持在1.6西格玛内的边缘一致。内禀谱线光度和H2O(202-111)/CO 8 -7比值似乎与附近的星暴/包绕活动星系核Mrk 231相当,这表明SDP. 17 b也可能拥有一个发光的活动星系核。在SDP.17b中检测到一条强的H2O 202-111线,意味着在非常稠密和温暖的星际气体中必须出现一种有效的激发机制。

英文摘要:

The Herschel survey, H-ATLAS, with its large areal coverage, has recently discovered a number of bright, strongly lensed high-z submillimeter galaxies. The strong magnification makes it possible to study molecular species other than CO, which are otherwise difficult to observe in high-z galaxies. Among the lensed galaxies already identified by H-ATLAS, the source J090302.9-014127B (SDP.17b) at z = 2.305 is remarkable due to its excitation conditions and a tentative detection of the H2O 202-111 emission line (Lupu et al. 2010). We report observations of this line in SDP.17b using the IRAM interferometer equipped with its new 277- 371GHz receivers. The H2O line is detected at a redshift of z = 2.3049+/-0.0006, with a flux of 7.8+/-0.5 Jy km s-1 and a FWHM of 250+/-60 km s-1. The new flux is 2.4 times weaker than the previous tentative detection, although both remain marginally consistent within 1.6-sigma. The intrinsic line luminosity and ratio of H2O(202-111)/CO8-7 seem comparable with those of the nearby starburst/enshrouded-AGN Mrk 231, suggesting that SDP.17b could also host a luminous AGN. The detection of a strong H2O 202-111 line in SDP.17b implies an efficient excitation mechanism of the water levels that must occur in very dense and warm interstellar gas.

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