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arXiv 1601.06970astro-ph.GAastro-ph.SR
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附近星系场中的斯皮策中红外点源

Spitzer mid-infrared point sources in the fields of nearby galaxies

S. J. Williams, A. Z. Bonanos

摘要:

我们提出的$Spitzer$ IRAC中红外点源目录的马赛克覆盖领域的附近($\lesssim$ 4兆秒差距)星系NGC 55,NGC 253,NGC 2366,NGC 4214,和NGC 5253。我们在这五个领域共检测到20159个源。对$Spitzer$ IRAC 3.6 $μ$ m和4.5 $μ$ m波段中检测到的高于背景3 $σ$以上的光源进行点扩散函数光度测定。然后,在较短波长光源的位置处进行IRAC 5.8 $μ$ m和8.0 $μ$ m波段的孔径光度测定,补充这些数据。对于在较长波长中没有检测到物体的源,我们根据当地天空背景估计了星等限制。单个星系的点源细分如下:NGC 55,8746个源; NGC 253,9001个源; NGC 2366,505个源; NGC 4214,1185个源; NGC 5253,722个源。完整的目录的限制不同的带通,并被发现是$m_{3.6}=18.0$,$m_{4.5}=17.5$,$m_{5.8}=17.0$,和$m_{8.0}=16.5$镁。对于所有的星系,这对应于检测点源比$M_{3.6}=-10$亮。这些星表可以作为恒星族群调查、个别恒星天体研究以及未来詹姆斯·韦伯太空望远镜计划中红外观测的参考。

英文摘要:

We present $Spitzer$ IRAC mid-infrared point source catalogs for mosaics covering the fields of the nearby ($\lesssim$4 Mpc) galaxies NGC 55, NGC 253, NGC 2366, NGC 4214, and NGC 5253. We detect a total of 20159 sources in these five fields. Point spread function photometry was performed on sources detected in both $Spitzer$ IRAC 3.6 $μ$m and 4.5 $μ$m bands at greater than 3$σ$ above background. These data were then supplemented by aperture photometry in the IRAC 5.8 $μ$m and 8.0 $μ$m bands conducted at the positions of the shorter wavelength sources. For sources with no detected object in the longer wavelengths, we estimated magnitude limits based on the local sky background. The individual galaxy point source breakdown is the following: NGC 55, 8746 sources; NGC 253, 9001 sources; NGC 2366, 505 sources; NGC 4214, 1185 sources; NGC 5253, 722 sources. The completeness limits of the full catalog vary with bandpass and were found to be $m_{3.6}=18.0$, $m_{4.5}=17.5$, $m_{5.8}=17.0$, and $m_{8.0}=16.5$ mag. For all galaxies, this corresponds to detection of point sources brighter than $M_{3.6}=-10$. These catalogs can be used as a reference for stellar population investigations, individual stellar object studies, and in planning future mid-infrared observations with the James Webb Space Telescope.

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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