Properties of damped Ly α absorption systems and star-forming galaxies in semi-analytic models at z = 2
Properties of damped Ly α absorption systems and star-forming galaxies in semi-analytic models at z = 2
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z = 2 半解析模型中阻尼 Ly α 吸收系统和恒星形成星系的特性
DOI：
10.1093/mnras/stw231
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发表时间：
2016
影响因子：
4.8
通讯作者：
S. Trager
中科院分区：
文献类型：
--
作者：
Michael Berry;R. Somerville;E. Gawiser;A. Maller;G. Popping;S. Trager
我们研究了半解析宇宙学模型对恒星形成星系（SFG）和阻尼Ly α吸收系统（DLAS）性质的预言，以及这两个群体之间的关系。我们的模型相当好地再现了观测到的z 2 SFG的红移、恒星质量、星星形成率（SFR）和尘埃消光的分布。我们预测，DLA主机跨越广泛的属性，广泛和相对平坦的分布的恒星和晕质量，SFR，和光度。DLA宿主星系的光度颜色跟踪具有类似光度的星系的颜色，但大多数比大多数现有的SFG调查的限制要暗得多。一般来说，DLA宿主星系和SFG在z = 2遵循类似的趋势之间的恒星质量，DLA横截面，冷气分数，SFR，金属丰度，和尘埃灭绝的全球人口的星系具有相同的恒星质量。由于DLAS选择具有较大冷气质量的星系，因此它们往往具有较大的冷气分数，较低的金属丰度，较高的SFR和较少的尘埃消光。我们的模型再现了所观察到的影响参数，柱密度和金属丰度之间的关系，这表明在我们的模型中产生DLAS的气盘的大小大致正确。我们发现，分子分数和SFR一般显着低于在DLA视线的位置比银河系的平均值。
We investigate predictions from semi-analytic cosmological models of galaxy formation for the properties of star-forming galaxies (SFGs) and damped Ly α absorption systems (DLAS), and the relationship between these two populations. Our models reproduce fairly well the observed distributions of redshift, stellar mass, star formation rate (SFR), and dust extinction for z ˜ 2 SFGs. We predict that DLA hosts span a broad range of properties, with broad and relatively flat distributions of stellar and halo mass, SFR, and luminosity. The photometric colours of DLA host galaxies trace the colours of galaxies with similar luminosities, but the majority are much fainter than the limits of most existing surveys of SFGs. Generally, DLA host galaxies and SFGs at z = 2 follow similar trends between stellar mass, DLA cross-section, cold gas fraction, SFR, metallicity, and dust extinction as the global population of galaxies with the same stellar mass. Since DLAS select galaxies with larger cold gas masses, they tend to have larger cold gas fractions, lower metallicities, higher SFRs, and less dust extinction than galaxies at the same stellar mass. Our models reproduce the observed relations between impact parameter, column density, and metallicity, suggesting that the sizes of the gas discs giving rise to DLAS in our models are roughly correct. We find that molecular fractions and SFRs are in general significantly lower at the location of the DLA line of sight than the galaxy-averaged value.
DOI：
10.1088/0004-637x/768/1/74
发表时间：
2012-11
期刊：
The Astrophysical Journal
影响因子：
--
作者：
L. Tacconi;R. Neri;R. Genzel;F. Combes;A. Bolatto;M. Cooper;S. Wuyts;F. Bournaud;A. Burkert-
通讯作者：
L. Tacconi;R. Neri;R. Genzel;F. Combes;A. Bolatto;M. Cooper;S. Wuyts;F. Bournaud;A. Burkert-
影响因子：
8.7
作者：
Komatsu, E.;Smith, K. M.;Wright, E. L.
通讯作者：
Wright, E. L.