THE SPITZER SURVEY OF STELLAR STRUCTURE IN GALAXIES (S4G): STELLAR MASSES, SIZES, AND RADIAL PROFILES FOR 2352 NEARBY GALAXIES
THE SPITZER SURVEY OF STELLAR STRUCTURE IN GALAXIES (S4G): STELLAR MASSES, SIZES, AND RADIAL PROFILES FOR 2352 NEARBY GALAXIES
复制标题
星系中恒星结构的斯皮策巡天 (S4G)：2352 个附近星系的恒星质量、大小和径向轮廓
DOI：
10.1088/0067-0049/219/1/3
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
H. Courtois
中科院分区：
文献类型：
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作者：
J. Muńoz;K. Sheth;M. Regan;Taehyun Kim;J. Laine;S. E. Ferrer;A. Paz;S. Comerón;J. Hinz;E. Laurikainen;H. Salo;E. Athanassoula;A. Bosma;A. Bouquin;E. Schinnerer;L. Ho;D. Zaritsky;D. Gadotti;B. Madore;B. Holwerda;K. Menéndez;J. Knapen;S. Meidt;M. Querejeta;T. Mizusawa;M. Seibert;S. Laine;H. Courtois
斯皮策银河系恒星结构巡天是对2352个邻近星系进行的体积、星等和大小有限的巡天，深度成像在3.6和4.5 μm。在本文中，我们描述了我们的表面测光管道，并展示了我们向社区发布的相关数据产品。我们还确定了物理机制，导致不同水平的中央恒星质量浓度的星系具有相同的总恒星质量。最后，我们导出了不同形态星系在3.6 μm处的局域恒星质量-尺寸关系。我们的径向轮廓达到恒星质量表面密度低于1001 M/m2？> .考虑到尘埃的影响可以忽略不计，而且在这些波长下的质光比几乎是恒定的，这些剖面构成了附近星系恒星质量径向分布的准确清单。从这些配置文件中，我们还得到了全球性的性质，如渐近的大小（和相应的恒星质量），等照度线的大小和形状，和浓度指数。这些和其他来自我们各种管道的数据产品（科学准备镶嵌，对象掩模，2D图像分解和恒星质量图）可以在IRSA公开访问（http：//irsa.ipac.caltech.edu/data/SPITZER/S4G/）。
The Spitzer Survey of Stellar Structure in Galaxies is a volume, magnitude, and size-limited survey of 2352 nearby galaxies with deep imaging at 3.6 and 4.5 μm. In this paper, we describe our surface photometry pipeline and showcase the associated data products that we have released to the community. We also identify the physical mechanisms leading to different levels of central stellar mass concentration for galaxies with the same total stellar mass. Finally, we derive the local stellar mass–size relation at 3.6 μm for galaxies of different morphologies. Our radial profiles reach stellar mass surface densities below ∼ 1 M ⊙ pc − 2 ?> . Given the negligible impact of dust and the almost constant mass-to-light ratio at these wavelengths, these profiles constitute an accurate inventory of the radial distribution of stellar mass in nearby galaxies. From these profiles we have also derived global properties such as asymptotic magnitudes (and the corresponding stellar masses), isophotal sizes and shapes, and concentration indices. These and other data products from our various pipelines (science-ready mosaics, object masks, 2D image decompositions, and stellar mass maps) can be publicly accessed at IRSA (http://irsa.ipac.caltech.edu/data/SPITZER/S4G/).