The Herschel Virgo Cluster Survey - XII. FIR properties of optically selected Virgo cluster galaxies-猫眼课题宝

DOI：

10.1093/mnras/sts125

发表时间：

2012-09

期刊：

Monthly Notices of the Royal Astronomical Society

影响因子：

4.8

通讯作者：

中科院分区：

物理与天体物理2区

文献类型：

作者：

R. Auld;S. Bianchi;Matthew W. L. Smith;J. Davies;G. Bendo;S. D. Serego;L. Cortese;M. Baes;D. Bomans;M. Boquien;A. Boselli;L. Ciesla;M. Clemens;E. Corbelli;I. D. Looze;J. Fritz;G. Gavazzi;C. Pappalardo;M. Grossi;L. Hunt;S. Madden;L. Magrini;M. Pohlen;J. Verstappen;C. Vlahakis;E. Xilouris;S. Zibetti

赫歇尔室女座星团巡天（HeViCS）是在远红外波段对室女座星团进行的最深入、混淆有限的巡天。整个全深度调查覆盖了5个波段（100-500 μ m）约55度(2)，包括中央优势椭圆星系（M87， M86和M49）周围的区域，并延伸到NW云，W云和南部延伸。该调查以较低的灵敏度扩展到该区域以外，因此覆盖的总面积为84度(2)。本文介绍了光选室女座星团目录（VCC）的数据、数据采集技术和检出率。我们在调查边界内发现的750个VCC星系中，至少有254个（34%）在一个波段中被发现，171个星系在所有五个波段中都被发现。对于其余的星系，我们已经测量了它们FIR发射的严格上限。被探测到的星系群中既有早期星系，也有晚期星系，尽管后者在探测统计中占主导地位。我们已经模拟了168个星系，在它们的FIR光谱中没有显示出强同步加速器成分的证据，使用了一个固定发射率指数（β = 2）的单温度修正黑体光谱。对chi(2)分布的研究表明，该模型并不适用于所有情况，这一点得到了FIR颜色的支持，该颜色表示β = 1-2的传播。用chi(2)（d.o.f）对140个星系尘埃质量和温度分布的统计比较。=3) \textless 7.8（95%置信水平）表明，晚的类型通常具有更冷、更大的尘埃储层；早型尘埃质量的平均值为log[\textless M \textgreater/M-circle dot] = 6.3 +/- 0.3，晚型尘埃质量的平均值为log[\textless M \textgreater/M-circle dot] = 7.1 +/- 0.1。晚型尘温平均值\textless T \textgreater = 19.4 +/- 0.2 K，早型尘温平均值\textless T \textgreater = 21.1 +/- 0.8 K。星系团中晚期星系的尘埃质量略低于野外星系，但星系团环境似乎对早期星系的大块尘埃特性影响不大。在未来的论文中，我们将更多地关注星表的科学分析（例如测量FIR亮度函数，尘埃质量函数和分解气体和尘埃特性）。

The Herschel Virgo Cluster Survey (HeViCS) is the deepest, confusion-limited survey of the Virgo Cluster at far-infrared (FIR) wavelengths. The entire survey at full depth covers similar to 55 deg(2) in five bands (100-500 mu m), encompassing the areas around the central dominant elliptical galaxies (M87, M86 and M49) and extends as far as the NW cloud, the W cloud and the Southern extension. The survey extends beyond this region with lower sensitivity so that the total area covered is 84 deg(2). In this paper we describe the data, the data acquisition techniques and present the detection rates of the optically selected Virgo Cluster Catalogue (VCC). We detect 254 (34 per cent) of 750 VCC galaxies found within the survey boundary in at least one band and 171 galaxies are detected in all five bands. For the remainder of the galaxies we have measured strict upper limits for their FIR emission. The population of detected galaxies contains early as well as late types although the latter dominate the detection statistics. We have modelled 168 galaxies, showing no evidence of a strong synchrotron component in their FIR spectra, using a single-temperature modified blackbody spectrum with a fixed emissivity index (beta = 2). A study of the chi(2) distribution indicates that this model is not appropriate in all cases, and this is supported by the FIR colours which indicate a spread in beta = 1-2. Statistical comparison of the dust mass and temperature distributions from 140 galaxies with chi(2)(d.o.f.=3) \textless 7.8 (95 per cent confidence level) shows that late types have typically colder, more massive dust reservoirs; the early-type dust masses have a mean of log[\textless M \textgreater/M-circle dot] = 6.3 +/- 0.3, while for late types log[\textless M \textgreater/M-circle dot] = 7.1 +/- 0.1. The late-type dust temperatures have a mean of \textless T \textgreater = 19.4 +/- 0.2 K, while for the early types, \textless T \textgreater = 21.1 +/- 0.8 K. Late-type galaxies in the cluster exhibit slightly lower dust masses than those in the field, but the cluster environment seems to have little effect on the bulk dust properties of early types. In future papers we will focus more on the scientific analysis of the catalogue (e.g. measuring FIR luminosity functions, dust mass functions and resolved gas and dust properties).

The Herschel Virgo Cluster Survey - XII. FIR properties of optically selected Virgo cluster galaxies

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