Evolution in the Cluster Early-Type Galaxy Size-Surface Brightness Relation at z ≃1
Evolution in the Cluster Early-Type Galaxy Size-Surface Brightness Relation at z ≃1
复制标题
早期型星系团的演化 z ≃1 处的尺寸与表面亮度关系
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
W. Zheng
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作者：
B. Holden;J. Blakeslee;M. Postman;G. Illingworth;R. Demarco;M. Pranx;P. Rosati;R. Bouwens;A. R. Martel;H. Ford;M. Clampin;G. Hartig;Narciso Benitez;N. Cross;N. Homeier;C. Lidman;F. Menanteau;A. Zirm;D. R. Ardila;F. Bartko;L. Bradley;T. Broadhurst;Robert A. Brown;C. Burrows;E. Cheng;Paul D. Feldman;D. Golimowski;Tomotsugu Goto;C. Gronwall;L. Infante;R. Kimble;J. Krist;Michael P. Lesser;D. Magee;S. Mei;G. Meurer;G. Miley;V. Motta;M. Sirianni;W. Sparks;Hien D. Tran;Z. Tsvetanov;R. White;W. Zheng
我们研究了两个星团 RDCS J1252.9-2927 (z = 1.237) 和 RX J0152.7-1357 (z = 0.837) 中椭圆星系和 S0 星系的表面亮度分布随大小的变化。我们使用哈勃太空望远镜上的高级巡天相机的多色成像来确定这些尺寸和表面亮度。使用三种不同的表面亮度估计，我们发现我们可以可靠地估计样本中的星系的表面亮度，散射小于 0.2 星等，系统偏移为 ≲0.05 星等。我们在两个星团中构建了具有早期形态的星系样本。对于每个星团，我们在与静止帧 B 密切对应的频带中使用星等限制，在 z = 0 时达到 MB = -18.8 的星等限制，并仅选择星团颜色星等序列内的那些星系或使用我们的光谱红移。我们测量了静止坐标系 B 表面亮度的演化，发现 RDCS J1252.9-2927 的后发星系团的演化为 -1.41 ± 0.14 星等，RX J0152.7-1357 的演化为 -0.90 ± 0.12 星等，或者平均演化为 (-1.13 ± 0.15)z 星等。我们的统计误差主要由尺寸与表面亮度关系中观察到的散射决定，对于 RX J0152.7-1357，σ = 0.42 ± 0.05 mag；对于 RDCS J1252.9-2927，σ = 0.76 ± 0.10 mag。我们发现这种分散没有统计上显着的演变，尽管可以预期分散会增加。总体而言，我们测量的光度演化速度与早期型星系的基本平面一致，这意味着在 z ≃ 1 观测到的大多数大质量早期型星系都是在高红移下形成的。
We investigate the evolution in the distribution of surface brightness, as a function of size, for elliptical and S0 galaxies in the two clusters RDCS J1252.9-2927 (z = 1.237) and RX J0152.7-1357 (z = 0.837). We use multicolor imaging with the Advanced Camera for Surveys on the Hubble Space Telescope to determine these sizes and surface brightnesses. Using three different estimates of the surface brightnesses, we find that we reliably estimate the surface brightness for the galaxies in our sample with a scatter of <0.2 mag and with systematic shifts of ≲0.05 mag. We construct samples of galaxies with early-type morphologies in both clusters. For each cluster, we use a magnitude limit in a band that closely corresponds to the rest-frame B, to magnitude limit of MB = -18.8 at z = 0, and select only those galaxies within the color-magnitude sequence of the cluster or by using our spectroscopic redshifts. We measure evolution in the rest-frame B surface brightness and find -1.41 ± 0.14 mag from the Coma Cluster of galaxies for RDCS J1252.9-2927 and -0.90 ± 0.12 mag of evolution for RX J0152.7-1357, or an average evolution of (-1.13 ± 0.15)z mag. Our statistical errors are dominated by the observed scatter in the size-surface brightness relation, σ = 0.42 ± 0.05 mag for RX J0152.7-1357 and σ = 0.76 ± 0.10 mag for RDCS J1252.9-2927. We find no statistically significant evolution in this scatter, although an increase in the scatter could be expected. Overall, the pace of luminosity evolution we measure agrees with that of the fundamental plane of early-type galaxies, implying that the majority of massive early-type galaxies observed at z ≃ 1 formed at high redshifts.