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阿塔卡马宇宙学望远镜:利用Sunyaev-Zel'dovich效应选择的星系团的恒星含量

The Atacama Cosmology Telescope: the stellar content of galaxy clusters selected using the Sunyaev-Zel'dovich effect

Matt Hilton, Matthew Hasselfield, Cristóbal Sifón, Andrew J. Baker, L. Felipe Barrientos, Nicholas Battaglia, J. Richard Bond, Devin Crichton, Sudeep Das, Mark … 展开作者

Matt Hilton, Matthew Hasselfield, Cristóbal Sifón, Andrew J. Baker, L. Felipe Barrientos, Nicholas Battaglia, J. Richard Bond, Devin Crichton, Sudeep Das, Mark J. Devlin, Megan Gralla, Amir Hajian, Adam D. Hincks, John P. Hughes, Leopoldo Infante, Kent D. Irwin, Arthur Kosowsky, Yen-Ting Lin, Tobias A. Marriage, Danica Marsden, Felipe Menanteau, Kavilan Moodley, Michael D. Niemack, Mike R. Nolta, Lyman A. Page, Erik D. Reese, Jon Sievers, David N. Spergel, Edward J. Wollack

摘要:

我们提出了第一次测量的恒星质量分量的星系团选择通过Sunyaev-Zel'dovich(SZ)效应,使用3.6 μ m和4.5 μ m测光从斯皮策太空望远镜。我们的样本由阿塔卡马宇宙学望远镜(ACT)探测到的14个星团组成,它们的红移范围为0.27 < z < 1.07(中值z = 0.50),并具有动态质量测量,精确到约30%,中值M500 = 6.9 x 10^{14} MSun。我们测量的3.6微米和4.5微米的星系光度函数,发现特征星等(m*)和暗端斜率(α)是类似的IR选择集群样本。我们进行了第一次测量的SZ观测值(Y500和y 0)与最亮的星系团(BCG)的恒星质量和总的星系团恒星质量(M500星)的标度。我们发现BCG恒星质量和Y500(E(z)^{-2/3} DA^2 Y500 ~ M*^{1.2 +/- 0.6})之间存在显著的相关性,尽管由于样本量较小,我们无法对关系的斜率进行强有力的限制。此外,我们还得到了E(z)^{-2/3} DA^2 Y500 ~ M500 star ^{1.0 +/- 0.6}与恒星总质量的标度关系。恒星的质量分数在0.006-0.034之间,在动力学质量方面排名第二的星团(ACT-CL J 0237 -4939)具有异常低的总恒星质量和最低的恒星质量分数。对于文献中可用的五个气体质量测量的星系团,我们没有看到相对于宇宙平均值的重子短缺的证据。

英文摘要:

We present a first measurement of the stellar mass component of galaxy clusters selected via the Sunyaev-Zel'dovich (SZ) effect, using 3.6 um and 4.5 um photometry from the Spitzer Space Telescope. Our sample consists of 14 clusters detected by the Atacama Cosmology Telescope (ACT), which span the redshift range 0.27 < z < 1.07 (median z = 0.50), and have dynamical mass measurements, accurate to about 30 per cent, with median M500 = 6.9 x 10^{14} MSun. We measure the 3.6 um and 4.5 um galaxy luminosity functions, finding the characteristic magnitude (m*) and faint-end slope (alpha) to be similar to those for IR-selected cluster samples. We perform the first measurements of the scaling of SZ-observables (Y500 and y0) with both brightest cluster galaxy (BCG) stellar mass and total cluster stellar mass (M500star). We find a significant correlation between BCG stellar mass and Y500 (E(z)^{-2/3} DA^2 Y500 ~ M*^{1.2 +/- 0.6}), although we are not able to obtain a strong constraint on the slope of the relation due to the small sample size. Additionally, we obtain E(z)^{-2/3} DA^2 Y500 ~ M500star^{1.0 +/- 0.6} for the scaling with total stellar mass. The mass fraction in stars spans the range 0.006-0.034, with the second ranked cluster in terms of dynamical mass (ACT-CL J0237-4939) having an unusually low total stellar mass and the lowest stellar mass fraction. For the five clusters with gas mass measurements available in the literature, we see no evidence for a shortfall of baryons relative to the cosmic mean value.

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