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RED GALAXY CLUSTERING IN THE NOAO DEEP WIDE-FIELD SURVEY

机译:NOAO深部实地调查中的红色星系团

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We have measured the clustering of 0.30 < z < 0.90 red galaxies and constrained models of the evolution of large-scale structure using the initial 1.2 deg~2 data release of the NOAO Deep Wide-Field Survey (NDWFS). The area and B_WRI passbands of the NDWFS allow samples of approx> 10~3 galaxies to be selected as a function of spectral type, absolute magnitude, and photometric redshift. Spectral synthesis models can be used to predict the colors and luminosities of a galaxy population as a function of redshift. We have used PEGASE2 models, with exponentially declining star formation rates, to estimate the observed colors and luminosity evolution of galaxies and to connect, as an evolutionary sequence, related populations of galaxies at different redshifts. A red galaxy sample, with present-day rest-frame Vega colors of B_W-R > 1.44, was chosen to allow comparisons with the 2dF Galaxy Redshift Survey and Sloan Digital Sky Survey. We find the spatial clustering of red galaxies to be a strong function of luminosity, with r_0 increasing from 4.4 +- 0.4 h~(-1) Mpc at M_R - 5 log h ≈ -20.0 to 11.2 +- 1.0 h~(-1) Mpc at M_R - 5 log h ≈ -22.0. Clustering evolution measurements using samples where the rest-frame selection criteria vary with redshift, including all deep single-band magnitude limited samples, are biased because of the correlation of clustering with rest-frame color and luminosity. The clustering of -21.5 < M_R - 5 log h < -20.5, B_W-R > 1.44 galaxies exhibits no significant evolution over the redshift range observed with r_0 = 6.3 +- 0.5 h~(-1) Mpc in comoving coordinates. This is consistent with recent ACDM models in which the bias of L~* galaxies undergoes rapid evolution and r_0 evolves very slowly at z < 2.
机译:我们使用NOAO深广域勘测(NDWFS)的初始1.2 deg〜2数据发布,测量了0.30 10〜3个星系的样本。光谱合成模型可用于预测作为红移函数的银河人口的颜色和亮度。我们已经使用了PEGASE2模型,其恒星形成率呈指数下降,以估计观测到的星系颜色和光度演化,并以不同的红移形式连接星系的相关种群,作为一个演化序列。选择了红色星系样本,其当前静止帧的Vega颜色为B_W-R> 1.44,以便与2dF Galaxy Redshift Survey和Sloan Digital Sky Survey进行比较。我们发现红色星系的空间聚类是光度的强函数,r_0在M_R-5 log h≈-20.0时从4.4 +-0.4 h〜(-1)Mpc增加到11.2 +-1.0 h〜(-1 )Mpc在M_R-5 log h≈-22.0。由于聚类与静止帧颜色和亮度之间存在相关性,因此使用静止帧选择标准随红移而变化的样本(包括所有深单波段幅度受限样本)进行的聚类演化测量存在偏差。 -21.5 1.44星系的聚类在同移坐标中r_0 = 6.3 +-0.5 h〜(-1)Mpc时在红移范围内未显示出显着的演变。这与最近的ACDM模型是一致的,在ACDM模型中,L〜*星系的偏差快速演化,而r_0在z <2时演化非常缓慢。

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