The Norris Survey of the Corona Borealis Supercluster. II. Galaxy Evolution with Redshift and Environment
The Norris Survey of the Corona Borealis Supercluster. II. Galaxy Evolution with Redshift and Environment
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北冕座超星系团的诺里斯巡天。
DOI：
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发表时间：
1997
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通讯作者：
D. Hamilton
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作者：
T. Small;W. Sargent;D. Hamilton
我们测量场星系光度函数（LF）的颜色和红移的函数从z = 0到z = 0.5使用星系从诺里斯调查的北冕超星系团。该数据集由603个0 < z ≤ 0.5的场星系组成，其视星等范围很宽（14.0 μ r ~ 21.5），尽管我们的场星系LF分析仅限于493个r ≤ 20.0的星系。我们使用观测到的星系的g-r色来计算对其余BAB和r波段的精确校正。我们发现，我们的本地r-波段LF，当归一化计数在高银河纬度领域，同意与本地LF测量的Las Campanas红移调查。然而，我们的BAB波段局部LF与Stromlo/APM调查的bj波段LF不匹配，归一化高出1.6倍。我们看到令人信服的证据表明，BAB波段场星系LF的红移演变。在[O II] λ3727静止坐标系等效宽度大于10 <$m的恒星形成星系中，演化最为强烈。红色的静止星系群没有显示出演化到z = 0.5的迹象。我们观察到的LF的演化与其他暗星系红移调查的结果一致。具有[O II]发射的星系比例随着红移而迅速增加，但具有强Hδ吸收的星系比例（星星形成爆发的标志）则没有。因此，我们得出结论，在遥远的星系中的星星的形成主要是长寿的。我们还计算了北冕超星系团（z = 0.07，419个星系，14.1 ≤ r ≤ 20.0等）和阿贝尔2069超星系团（z = 0.11，318个星系，15.1 ≤ r ≤ 20.0等）的LF。这两个超星系团光度函数的形状与局域光度函数的形状大致相似。然而，两者之间存在着重要的区别。两个超星系团LF都有多余的非常明亮的星系。此外，北冕超星系团LF的特征星等大约比局域场星系LF亮半个星等，并且有迹象表明，对于比M（BAB）~ -17 +5 log 10 h等更暗的星系，LF的亮度会上升，其中h是哈勃常数，单位为100 km s-1 Mpc-1。
We measure the field galaxy luminosity function (LF) as a function of color and redshift from z = 0 to z = 0.5 using galaxies from the Norris Survey of the Corona Borealis Supercluster. The data set consists of 603 field galaxies with 0 < z ≤ 0.5 and spans a wide range in apparent magnitude (14.0 ≲ r ≲ 21.5), although our field galaxy LF analysis is limited to 493 galaxies with r ≤ 20.0 mag. We use the observed g-r colors of the galaxies to compute accurate corrections to the rest BAB and r bands. We find that our local r-band LF, when normalized to counts in high galactic latitude fields, agrees well with the local LF measured in the Las Campanas Redshift Survey. Our BAB-band local LF, however, does not match the bj-band LF from the Stromlo/APM survey, having a normalization 1.6 times higher. We see compelling evidence that the BAB-band field galaxy LF evolves with redshift. The evolution is strongest for the population of star-forming galaxies with [O II] λ3727 rest-frame equivalent widths greater than 10 Å. The population of red, quiescent galaxies shows no sign of evolution to z = 0.5. The evolution of the LF that we observe is consistent with the findings of other faint galaxy redshift surveys. The fraction of galaxies with [O II] emission increases rapidly with redshift, but the fraction of galaxies with strong Hδ absorption, a signature of a burst of star formation, does not. We thus conclude that the star formation in distant galaxies is primarily long-lived. We also compute the LFs of the Corona Borealis supercluster (z ≈ 0.07, 419 galaxies with 14.1 ≤ r ≤ 20.0 mag) and the Abell 2069 supercluster (z ≈ 0.11, 318 galaxies with 15.1 ≤ r ≤ 20.0 mag). The shapes of the two supercluster luminosity functions are broadly similar to the shape of the local luminosity function. However, there are important differences. Both supercluster LFs have an excess of very bright galaxies. In addition, the characteristic magnitude of the Corona Borealis supercluster LF is roughly half a magnitude brighter than that of the local field galaxy LF, and there is a suggestion of an upturn in the LF for galaxies fainter than M(BAB) ~ -17 + 5 log10 h mag, where h is the Hubble constant in units of 100 km s-1 Mpc-1.