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arXiv 1105.4663astro-ph.GA
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H_2O南银道面巡天(HOPS):I.技术与H_2O脉泽数据

The H_2O southern Galactic Plane Survey (HOPS): I. Techniques and H_2O maser data

A. J. Walsh, S. L. Breen, T. Britton, K. J. Brooks, M. G. Burton, M. R. Cunningham, J. A. Green, L. Harvey-Smith, L. Hindson, M. G. Hoare, B. Indermuehle, P. A.… 展开作者

A. J. Walsh, S. L. Breen, T. Britton, K. J. Brooks, M. G. Burton, M. R. Cunningham, J. A. Green, L. Harvey-Smith, L. Hindson, M. G. Hoare, B. Indermuehle, P. A. Jones, N. Lo, S. N. Longmore, V. Lowe, C. J. Phillips, C. R. Purcell, M. A. Thompson, J. S. Urquhart, M. A. Voronkov, G. L. White, M. T. Whiting

摘要:

本文介绍了利用宽波段后端、光束尺寸约为2 '的Mopra射电望远镜进行的H_2O南银道面巡天(HOPS)的初步结果。我们在12毫米波段(19.5 ~ 27.5GHz)观测了100平方度的南银道面,包括水脉泽的谱线发射,氨、氰乙炔、甲醇的多重亚稳跃迁和射电复合谱线。在本文中,我们报告的调查和水脉泽发射的特点。我们发现了540个水脉泽,其中334个是新发现的。最强的脉泽为3933 Jy,最弱的为0.7Jy,超过100 Jy的脉泽有62个。在14个脉泽站中,水脉泽辐射速度分布超过100 km/s。在一个区域,水脉泽速度间隔为351.3km/s。均方根噪声电平通常在1- 2 Jy之间,95%的测量结果低于2 Jy。我们估计在8.4Jy附近的完全性极限为98%,在5.5Jy附近的完全性极限为50%。我们估计,有800和1500之间的水脉泽在银河系中,可检测的调查与类似的完整性限制HOPS。我们报道了在NH_3(11,9)和(8,6)谱线上G19.61-0.23和在NH_3(3,3)谱线上G23.33-0.30的可能脉泽。

英文摘要:

We present first results of the H_2O Southern Galactic Plane Survey (HOPS), using the Mopra radiotelescope with a broad band backend and a beam size of about 2'. We have observed 100 square degrees of the southern Galactic plane at 12mm (19.5 to 27.5GHz), including spectral line emission from water masers, multiple metastable transitions of ammonia, cyanoacetylene, methanol and radio recombination lines. In this paper, we report on the characteristics of the survey and water maser emission. We find 540 water masers, of which 334 are new detections. The strongest maser is 3933Jy and the weakest is 0.7Jy, with 62 masers over 100Jy. In 14 maser sites, the spread in velocity of the water maser emission exceeds 100km/s. In one region, the water maser velocities are separated by 351.3km/s. The rms noise levels are typically between 1-2Jy, with 95% of the survey under 2Jy. We estimate completeness limits of 98% at around 8.4Jy and 50% at around 5.5Jy. We estimate that there are between 800 and 1500 water masers in the Galaxy that are detectable in a survey with similar completeness limits to HOPS. We report possible masers in NH_3 (11,9) and (8,6) emission towards G19.61-0.23 and in the NH_3 (3,3) line towards G23.33-0.30.

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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