Far-infrared Source Counts at 70 and 160 Microns in Spitzer Deep Surveys
Far-infrared Source Counts at 70 and 160 Microns in Spitzer Deep Surveys
复制标题
斯皮策深度巡天中远红外光源的波长为 70 微米和 160 微米
DOI：
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发表时间：
2004
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通讯作者：
Paul L. Richards
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作者：
H. Dole;H. Dole;E. Floc’h;P. Pérez;C. Papovich;E. Egami;G. Lagache;A. Alonso;C. Engelbracht;K. D. Gordon;D. Hines;D. Hines;O. Krause;K. Misselt;J. Morrison;G. Rieke;M. Rieke;J. Rigby;E. Young;L. Bai;M. Blaylock;G. Neugebauer;C. Beichman;D. Frayer;J. Mould;Paul L. Richards
利用斯皮策多波段成像光度计（MIPS）计算了70 μ m和160 μm的星系源数，并绘制了Chandra深场-南（CDF-S）和其他场的图。在70 μm处，我们的观测结果从15 mJy的阈值向上延伸了大约2个数量级的通量密度，在160 μm处，它们从50 mJy向上延伸了大约一个数量级。这些计数与以前对亮端的观察结果一致。在两个条带中的计数的微弱端检测到显著的进化，比无进化模型高2-3倍。这一演化过程与表明大多数暗星系的红移在0.7到0.9之间的模型非常吻合。新的斯皮策数据已经解决了70 μm处约23%的宇宙远红外背景，160 μm处约7%。
We derive galaxy source counts at 70 and 160 μm using the Multiband Imaging Photometer for Spitzer (MIPS) to map the Chandra Deep Field-South (CDF-S) and other fields. At 70 μm, our observations extend upward about 2 orders of magnitude in flux density from a threshold of 15 mJy, and at 160 μm they extend about an order of magnitude upward from 50 mJy. The counts are consistent with previous observations on the bright end. Significant evolution is detected at the faint end of the counts in both bands, by factors of 2-3 over no-evolution models. This evolution agrees well with models that indicate that most of the faint galaxies lie at redshifts between 0.7 and 0.9. The new Spitzer data already resolve about 23% of the cosmic far-infrared background at 70 μm and about 7% at 160 μm.