Extremely Red Objects from the Hubble Space Telescope NICMOS Parallel Imaging Survey
Extremely Red Objects from the Hubble Space Telescope NICMOS Parallel Imaging Survey
复制标题
哈勃太空望远镜 NICMOS 并行成像巡天中的极红天体
DOI：
10.1086/301454
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
A. Dressler
中科院分区：
文献类型：
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作者：
Lin Yan;P. McCarthy;R. Weymann;M. Malkan;H. Teplitz;L. Storrie;Malcolm G. Smith;A. Dressler
我们介绍了利用哈勃太空望远镜近红外相机和多目标光谱仪(NICMOS)平行成像数据库和地面光学跟踪观测发现的极端红色天体(ERO)的目录。在16个弧线2的区域内，用R-F160W>；5和F160W<；21.5探测到15个物体。我们还获得了15个性爱的子集的K波段光度测量结果。所有在K波段成像的R-F160W选择的ERO都有R-K>；6.我们的天体的F110W-F160W的颜色在1.32.1范围内，比z∼0.8时的星团椭圆星系更红，比同样深度的F160W图像中选择的平均群体红近1 MAG。此外，在仅有的22个NICMOS点中，我们在两个视场中探测到了两个群或星团；每个星团包含三个或更多的ERO，这表明极红星系可能是强烈的星系团。在亮度为F160W<；19.5的情况下，ERO表面密度与其他测量测量的结果相似。在我们的样品极限F160W=21.5下，我们测得的表面密度为0.94±0.24arcmin-2。排除两个可能的群或星团和一个明显的恒星物体，表面密度降至0.38±0.15 arcmin-2。
We present a catalog of extremely red objects (EROs) discovered using the Hubble Space Telescope Near Infrared Camera and Multi-Object Spectrometer (NICMOS) parallel imaging database and ground-based optical follow-up observations. Within an area of 16 arcmin2, we detect 15 objects with R-F160W > 5 and F160W < 21.5. We have also obtained K-band photometry for a subset of the 15 EROs. All of the R-F160W selected EROs imaged at K-band have R-K > 6. Our objects have F110W-F160W colors in the range 1.3–2.1, redder than the cluster elliptical galaxies at z ∼ 0.8 and nearly 1 mag redder than the average population selected from the F160W images at the same depth. In addition, among only 22 NICMOS pointings, we detected two groups or clusters in two fields; each contains three or more EROs, suggesting that extremely red galaxies may be strongly clustered. At bright magnitudes with F160W < 19.5, the ERO surface density is similar to what has been measured by other surveys. At the limit of our sample, F160W = 21.5, our measured surface density is 0.94 ± 0.24 arcmin-2. Excluding the two possible groups or clusters and the one apparently stellar object reduces the surface density to 0.38 ± 0.15 arcmin-2.