A deep 6.7 μm survey in the SSA13 field with ISO
A deep 6.7 μm survey in the SSA13 field with ISO
复制标题
使用 ISO 在 SSA13 领域进行 6.7 μm 深度勘测
DOI：
10.1051/0004-6361:20030661
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发表时间：
2003
影响因子：
6.5
通讯作者：
Mpe
中科院分区：
文献类型：
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作者：
Y. Sato;K. Kawara;L. Cowie;Y. Taniguchi;D. Sanders;H. Matsuhara;H. Okuda;K. Wakamatsu;Y. Sofue;R. Joseph;T. M. Isas;U. Tokyo;U. Hawaii;U. Tohoku;Gao;U. Gifu;Mpe
我们目前的结果，深中红外调查在SSA 13领域与红外空间天文台（ISO）。为了探测高红移的近红外光，我们用中红外相机ISOCAM的宽带LW 2（5-8.5 µm）滤光片测量了这个区域。在23小时的观测中采用了高度冗余的成像策略，并仔细处理了由非常高的宇宙射线撞击率引起的探测器响应度的逐渐变化，我们成功地在中央7 arcmin 2区域达到了80%的完整性极限16 µJy。利用信噪比图，我们在16 arcmin 2场中检测到65个低至6 μJy的源。在6.7 μm处的星系数积分可以得到，在暗极限处达到1.3 × 10 4 deg −2，在13 μJy和130 μJy之间的斜率为−1.6。在这个通量范围内对单个源进行积分，河外背景光在6.7 µm处的分辨分数估计为0.56 nW m −2 sr −1。这些结果达到了比哈勃深场弱三倍的通量极限，与Franceschini等人（1997）的模型预测相当吻合。最后，我们讨论了遥远的大质量E/S 0星系与微弱的6.7 μm星系群的关系。
We present results of a deep mid-infrared survey in the SSA13 field with the Infrared Space Observatory (ISO). In order to probe the near-infrared light at high redshifts, we surveyed the field with the broad band LW2 (5-8.5 µm) filter of the mid-infrared camera ISOCAM. Adopting a highly redundant imaging strategy for the 23 h observation and carefully treating gradual changes in the detector responsivity caused by a very high rate of cosmic ray impacts, we succeeded in reaching an 80% completeness limit of 16 µJy in the central 7 arcmin 2 region. Utilizing the signal-to-noise ratio map, we detected 65 sources down to 6 µJy in the 16 arcmin 2 field. Integral galaxy number counts at 6.7 µm are then derived, reaching 1.3 × 10 4 deg −2 at the faint limit with a slope of −1.6 between 13 µJy and 130 µJy. Integrating individual sources in this flux range, the resolved fraction of the extragalactic background light at 6.7 µm is estimated to be 0.56 nW m −2 sr −1 . These results, which reach a flux limit three times fainter than those in the Hubble Deep Fields, are in fairly good agreement with a model prediction by Franceschini et al. (1997). Finally, we discuss the relation of distant massive E/S0 galaxies to the faint 6.7 µm galaxy population.