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arXiv 1202.0547astro-ph.CO
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尘埃辐射能用来绘制高红移星系中的星际介质吗?Herschel参考调查结果

Can dust emission be used to map the interstellar medium in high-redshift galaxies? Results from the Herschel Reference Survey

Stephen Eales, Matthew W. L. Smith, Robbie Auld, Maarten Baes, George J. Bendo, Simone Bianchi, Alessandro Boselli, Laure Ciesla, David Clements, Asantha Cooray… 展开作者

Stephen Eales, Matthew W. L. Smith, Robbie Auld, Maarten Baes, George J. Bendo, Simone Bianchi, Alessandro Boselli, Laure Ciesla, David Clements, Asantha Cooray, Luca Cortese, Jon Davies, Ilse De Looze, Maud Galametz, Walter Gear, Gianfranco Gentile, Haley Gomez, Jacopo Fritz, Tom Hughes, Suzanne Madden, Laura Magrini, Michael Pohlen, Luigi Spinoglio, Joris Verstappen, Catherine Vlahakis, Christine D. Wilson

摘要:

经常有人建议,估计星系中星际介质(ISM)质量的标准CO/21-cm方法的替代方法可能是从连续尘埃排放中估计ISM的质量。在本文中,我们调查的潜力,这种技术使用赫歇尔观测的10个星系在赫歇尔参考调查和赫歇尔室女星系团调查。我们发现,赫歇尔探测到的辐射主要来自尘埃,其温度和发射率指数与我们星系中本地ISM中的尘埃相似,温度通常会向每个星系的中心增加。我们校准尘埃的方法,使用CO和21厘米的观测,以提供一个独立的估计在每个星系中的氢的质量,解决了问题的不确定的“X因子”的分子气体,通过最大限度地减少使用这两种方法估计的质量比的分散。通过对粉尘法的校准和以这种方式产生的X因子的估计,两种气体质量之比的离散度为30%,这给出了粉尘法的基本准确度的上限。我们得到的尘埃方法的校准是非常相似的一个独立的赫歇尔测量M31和银河系的普朗克测量的校准。

英文摘要:

It has often been suggested that an alternative to the standard CO/21-cm method for estimating the mass of the interstellar medium (ISM) in a galaxy might be to estimate the mass of the ISM from the continuum dust emission. In this paper, we investigate the potential of this technique using Herschel observations of ten galaxies in the Herschel Reference Survey and in the Herschel Virgo Cluster Survey. We show that the emission detected by Herschel is mostly from dust that has a temperature and emissivity index similar to that of dust in the local ISM in our galaxy, with the temperature generally increasing towards the centre of each galaxy. We calibrate the dust method using the CO and 21-cm observations to provide an independent estimate of the mass of hydrogen in each galaxy, solving the problem of the uncertain `X factor' for the molecular gas by minimizing the dispersion in the ratio of the masses estimated using the two methods. With the calibration for the dust method and the estimate of the X-factor produced in this way, the dispersion in the ratio of the two gas masses is 30%, which gives an upper limit on the fundamental accuracy of the dust method. The calibration we obtain for the dust method is very similar to an independent Herschel measurement for M31 and to the calibration for the Milky Way from Planck measurements.

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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