AKARI Infrared Camera Survey of the Large Magellanic Cloud. I. Point-source Catalog
AKARI Infrared Camera Survey of the Large Magellanic Cloud. I. Point-source Catalog
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AKARI 红外相机对大麦哲伦星云的勘测。
DOI：
10.1088/0004-6256/144/6/179
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发表时间：
2012
影响因子：
5.3
通讯作者：
加藤 大輔(共著として参加)
中科院分区：
文献类型：
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作者：
馬場聖至;多田訓子;梁朋飛;張羅磊;清水久芳;歌田久司;加藤 大輔(共著として参加)
本文利用AKARI卫星上的红外相机拍摄了大麦哲伦星云（LMC） 10°2区域的近中红外点源目录，包含5个光度波段，分别为3.2、7、11、15和24 μm。为了覆盖调查区域，在2006年5月至6月、2006年10月至12月和2007年3月至7月三个季节分别进行了观测。在3.2、7、11、15和24 μm下，10σ极限震级分别为17.9、13.8、12.4、9.9和8.6等。在3.2 μm波段光度精度约为0.1 mag，在其他波段光度精度约为0.06 ~ 0.07 mag。定位精度在3.2、7和11 μm处为0 farcs 3，在15和24 μm处为1 farcs 0。3.2、7和24 μm的灵敏度与Spitzer SAGE LMC点源目录大致相当，而AKARI目录提供了11和15 μm的数据，连续覆盖了中红外光谱范围。提供了两种类型的目录：catalog和Archive。存档包含所有检测到的源，而目录只包括在Spitzer SAGE点源目录中有对应的源。在3.2 μm、7 μm、11 μm、15 μm、24 μm上分别有65万份、14万份、9.7万份、4.3万份、5.2万份资料。在此基础上，利用3.2、7和11 μm波段的数据，讨论了各波段的光度函数、色-色图和色-星等图。没有星周包层的恒星，富含c和o的尘埃恒星，年轻的恒星物体和背景星系位于图中的不同区域，这表明目前的目录对LMC方向的物体分类是有用的。
We present a near-to mid-infrared point-source catalog of five photometric bands at 3.2, 7, 11, 15, and 24 μm for a 10 deg 2 area of the Large Magellanic Cloud (LMC) obtained with the Infrared Camera on board the AKARI satellite. To cover the survey area the observations were carried out at three separate seasons from 2006 May to June, 2006 October to December, and 2007 March to July. The 10σ limiting magnitudes of the present survey are 17.9, 13.8, 12.4, 9.9, and 8.6 mag at 3.2, 7, 11, 15, and 24 μm, respectively. The photometric accuracy is estimated to be about 0.1 mag at 3.2 μm and 0.06–0.07 mag in the other bands. The position accuracy is 0 farcs 3 at 3.2, 7, and 11 μm and 1 farcs 0 at 15 and 24 μm. The sensitivities at 3.2, 7, and 24 μm are roughly comparable to those of the Spitzer SAGE LMC point-source catalog, while the AKARI catalog provides the data at 11 and 15 μm, covering the mid-infrared spectral range contiguously. Two types of catalog are provided: a Catalog and an Archive. The Archive contains all the detected sources, while the Catalog only includes the sources that have a counterpart in the Spitzer SAGE point-source catalog. The Archive contains about 650,000, 140,000, 97,000, 43,000, and 52,000 sources at 3.2, 7, 11, 15, and 24 μm, respectively. Based on the catalog, we discuss the luminosity functions at each band, the color–color diagram, and the color–magnitude diagram using the 3.2, 7, and 11 μm band data. Stars without circumstellar envelopes, dusty C-rich and O-rich stars, young stellar objects, and background galaxies are located at distinct regions in the diagrams, suggesting that the present catalog is useful for the classification of objects toward the LMC.