Galaxy And Mass Assembly (GAMA): ugrizYJHK Sérsic luminosity functions and the cosmic spectral energy distribution by Hubble type

Galaxy And Mass Assembly (GAMA): ugrizYJHK Sérsic luminosity functions and the cosmic spectral energy distribution by Hubble type
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星系和质量组装 (GAMA):ugrizYJHK Sérsic 光度函数和哈勃类型的宇宙光谱能量分布

DOI:
10.1093/mnras/stt2391
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发表时间:
2014
影响因子:
4.8
通讯作者:
Kelvin L
Kelvin L
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Kelvin L

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本文报道了来自银河系和质量大会巡天的3727个星系的形态分类,它们的Mr <-17.4等,红移范围为0.025 <z< 0.06(2.1 × 105 Mpc ~ 3),分为E,S 0-Sa,SB 0-SBa,Sab-Scd,SBab-SBcd,Sd-Irr和小蓝球体类。在我们的样本中,大约70%的星系是盘状主导系统,剩下的30%是球状主导系统。我们建立了我们的分类的鲁棒性,并使用它们来获得形态类型的光度函数和光度密度在theugrizYJHK通带,改善了以前的研究,分裂的全球颜色或光剖面形状单独。我们发现,总星系光度函数可以用双谢克特函数来描述,而组成形态类型的光度函数可以用单谢克特函数来描述。这些数据也被用来推导每个哈勃级的星星形成率密度,以及衰减和未衰减(对尘埃进行了校正)的宇宙光谱能量分布,即瞬时能量产生预算。虽然观测到的光学/近红外能量预算主要是58:42的星系与一个显着的球状组成部分,实际的能量生产率是相反的,即组合盘为主的人口产生的能量是球状为主的人口的1.3倍。在最大的尺度上,这意味着局部宇宙中的化学演化目前主要局限于像我们银河系这样的中等螺旋类。
We report the morphological classification of 3727 galaxies from the Galaxy and Mass Assembly survey withMr< −17.4 mag and in the redshift range 0.025 <z< 0.06 (2.1 × 105Mpc3) into E, S0-Sa, SB0-SBa, Sab-Scd, SBab-SBcd, Sd-Irr and little blue spheroid classes. Approximately 70 per cent of galaxies in our sample are disc-dominated systems, with the remaining ∼30 per cent spheroid dominated. We establish the robustness of our classifications, and use them to derive morphological-type luminosity functions and luminosity densities in theugrizYJHKpassbands, improving on prior studies that split by global colour or light profile shape alone. We find that the total galaxy luminosity function is best described by a double-Schechter function while the constituent morphological-type luminosity functions are well described by a single-Schechter function. These data are also used to derive the star formation rate densities for each Hubble class, and the attenuated and unattenuated (corrected for dust) cosmic spectral energy distributions, i.e. the instantaneous energy production budget. While the observed optical/near-IR energy budget is dominated 58:42 by galaxies with a significant spheroidal component, the actual energy production rate is reversed, i.e. the combined disc-dominated populations generate ∼1.3 times as much energy as the spheroid-dominated populations. On the grandest scale, this implies that chemical evolution in the local Universe is currently largely confined to mid-type spiral classes like our Milky Way.
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