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arXiv 1407.3680astro-ph.GA
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哈勃紫外UltraDeep场中z> 1恒星形成星系的UV连续谱

The UV Continuum of z > 1 Star-forming Galaxies in the Hubble Ultraviolet UltraDeep Field

Peter Kurczynski, Eric Gawiser, Marc Rafelski, Harry I. Teplitz, Viviana Acquaviva, Thomas M. Brown, Dan Coe, Duilia F. de Mello, Steven L. Finkelstein, Norman … 展开作者

Peter Kurczynski, Eric Gawiser, Marc Rafelski, Harry I. Teplitz, Viviana Acquaviva, Thomas M. Brown, Dan Coe, Duilia F. de Mello, Steven L. Finkelstein, Norman A. Grogin, Anton M. Koekemoer, Kyoung-soo Lee, Claudia Scarlata, Brian D. Siana

摘要:

我们估计了哈勃超深场(HUDF)中923个星系在1 <z <8范围内的紫外连续斜率β。这些数据包括460个1 <z <2的星系,其绝对星等为M_{UV} =-14(~0.006 L *_{z = 1}; 0.02 L *_{z = 0}),与本地宇宙中的矮星系相当。我们将F225W,F275W,F336W波段的深HST/UVIS测光(UVUDF)与HST/WFC 3/IR(HUDF 12)的最新数据相结合。在1 <z <2范围内的星系比本地矮星系要蓝得多。我们发现其平均值(中位数)=-1.382(-1.830)+/-0.002(随机)+/-0.1(系统)。<beta>我们发现在β散射(标准差= 0.43)本地矮星系和30%以上的散射比z&gt; 2星系。我们研究了分仓子样本的β随红移和绝对星等的变化趋势,发现了一个适度的颜色-星等关系,d β/dM =-0.11 +/-0.01,并且d β/dM没有随红移而变化。尘埃红化随红移和光度的适度增加,Δ E(B-V)~0.1,以及在z &lt;2时尘埃红化分散度的相应增加,似乎可以解释观测到的趋势。在z&gt; 2时,我们发现与以前的工作一致的趋势;在1 &lt;z &lt;8的范围内,我们发现了一个红移的颜色演化,在低光度下,d β/dz =-0.09 +/-0.01(0.05 L * z = 3),dbeta/dz =-0.06 +/-0.01。

英文摘要:

We estimate the UV continuum slope, beta, for 923 galaxies in the range 1 < z < 8 in the Hubble Ultradeep Field (HUDF). These data include 460 galaxies at 1 < z < 2 down to an absolute magnitude M_{UV} = -14 (~0.006 L*_{z=1}; 0.02 L*_{z=0}), comparable to dwarf galaxies in the local universe. We combine deep HST/UVIS photometry in F225W, F275W, F336W wavebands (UVUDF) with recent data from HST/WFC3/IR (HUDF12). Galaxies in the range 1 < z < 2 are significantly bluer than local dwarf galaxies. We find their mean (median) values <beta> = -1.382 (-1.830) +/- 0.002 (random) +/- 0.1 (systematic). We find comparable scatter in beta (standard deviation = 0.43) to local dwarf galaxies and 30% larger scatter than z > 2 galaxies. We study the trends of beta with redshift and absolute magnitude for binned sub-samples and find a modest color-magnitude relation, dbeta/dM = -0.11 +/- 0.01 and no evolution in dbeta/dM with redshift. A modest increase in dust reddening with redshift and luminosity, Delta E(B-V) ~ 0.1, and a comparable increase in the dispersion of dust reddening at z < 2, appears likely to explain the observed trends. At z > 2, we find trends that are consistent with previous works; combining our data with the literature in the range 1 < z < 8, we find a color evolution with redshift, dbeta/dz = -0.09 +/-0.01 for low luminosity (0.05 L*_{z=3}), and dbeta/dz = -0.06 +/-0.01 for medium luminosity (0.25 L*_{z=3}) galaxies.

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