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Environmental Dependence of Stellar Mass, Star Formation Rate, Specific Star Formation Rate, and AGN Activity for an Apparent Magnitude Limited Main Galaxy Sample of the SDSS DR7

机译:SDSS DR7的视星大小有限的主要星系样本的恒星质量,恒星形成率,比恒星形成率和AGN活性对环境的依赖性

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In this study, we used an apparent magnitude limited Main galaxy sample of the Sloan Digital Sky Survey Data Release 7 (SDSS DR7), and investigated the environmental dependence of stellar mass, the star formation rate (SFR), the specific star formation rate (SSFR, the star formation rate per unit stellar mass) and active galactic nucleus (AGN) activity. To decrease the Malmquist bias, we divided the whole apparent magnitude limited Main galaxy sample into many subsamples with a redshift binning size of Az =0.01, and analysed the environmental dependence of these properties of subsamples in each redshift bin. It turns out that a strong environmental dependence of the stellar mass, SFR and SSFR could be observed in nearly all redshift bins of the apparent magnitude limited Main galaxy sample, and that in most redshift bins (except for a low redshift region of z = 0.02 to 0.06), the fraction of AGNs in the sample at low density apparently was larger than that in the sample at high density.
机译:在这项研究中,我们使用了斯隆数字天空测量数据版本7(SDSS DR7)的视星等有限的主星系样本,并研究了恒星质量,恒星形成率(SFR),比恒星形成率( SSFR,即每单位恒星质量的恒星形成率)和活跃的银河核(AGN)活性。为了减少Malmquist偏见,我们将整个视星等受限制的主星系样本分成许多红移装箱大小为Az = 0.01的子样本,并分析了每个红移箱中这些子样本的这些属性对环境的依赖性。事实证明,在几乎所有视星等受限制的主星系样本中,几乎所有红移仓中都观察到了恒星质量,SFR和SSFR的强烈环境依赖性,在大多数红移仓中(z = 0.02的低红移区除外)至0.06),低密度样品中AGN的比例明显大于高密度样品中AGN的比例。

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