On the optical appearance of distant galaxies.
On the optical appearance of distant galaxies.
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DOI：
10.1086/113065
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发表时间：
1981-12
期刊：
影响因子：
--
通讯作者：
C. Pritchet;M. Kline
中科院分区：
文献类型：
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作者：
C. Pritchet;M. Kline
我们使用布鲁祖尔和克朗最近的演化和 K 校正来预测跨越各种星等和红移的星系的光学外观。研究发现，几乎所有 J< 或大约的星系。 =25 在 1 角秒视宁度中解析。在固定的视星等下，红移较大的星系比 z 小的星系在外观上更加弥散。这一事实会导致任何星等水平上最遥远的星系被遗漏，并且根据所采用的测量算法，可能会导致检测到的星系的光度被严重低估。在尝试解释微弱星系的数量时，这两种效应都值得考虑。使用太空望远镜进行的观测预计可以解析几乎所有 J< 或约 1 的星系。 =27.5；然而，有几个因素共同导致太空望远镜观测在对遥远星系的光学探测方面不如某些地面 CCD 观测有效。最后，我们注意到我们的大多数结论不受假设宇宙学变化的影响。
We have used the recent evolutionary and K-corrections of Bruzual and Kron to predict the optical appearance of galaxies spanning a wide range of magnitudes and redshifts. It is found that nearly all galaxies with J< or approx. =25 are resolved in 1-arcsec seeing. At fixed apparent magnitude, galaxies with large redshifts are more diffuse in appearance than those at small z. This fact causes the most distant galaxies at any magnitude level to be missed, and, depending on the measurement algorithm employed, may cause the luminosities of detected galaxies to be seriously underestimated. Both of these effects deserve consideration when attempting to interpret number counts of faint galaxies. Observations made with the Space Telescope are expected to resolve nearly all galaxies at J< or approx. =27.5; however, several factors conspire to render Space Telescope observations less effective than certain ground-based CCD observations for the optical detection of distant galaxies. Finally, we note that most of our conclusions are unaffected by changes in the assumed cosmology.