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首页> 外文期刊>The Astrophysical journal >EVOLUTION OF THE LUMINOSITY FUNCTION, STAR FORMATION RATE, MORPHOLOGY, AND SIZE OF STAR-FORMING GALAXIES SELECTED AT REST-FRAME 1500 AND 2800 A
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EVOLUTION OF THE LUMINOSITY FUNCTION, STAR FORMATION RATE, MORPHOLOGY, AND SIZE OF STAR-FORMING GALAXIES SELECTED AT REST-FRAME 1500 AND 2800 A

机译：在1500和2800 A静止架上选择的发光度函数，恒星形成率，形态和恒星系大小的演变

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Using the multiwavelength photometric and spectroscopic data covering the Chandra Deep Field South obtained within the Great Observatories Origins Deep Survey, we investigate the rest-frame UV properties of galaxies to z ～ 2.2, including the evolution of the luminosity function, the luminosity density, star formation rate (SFR), and galaxy morphology. We find a significant brightening (～1 mag) in the rest-frame 2800 A characteristic magnitude (M~*) over the redshift range 0.3 approx< z approx< 1.7 and no evolution at higher redshifts. The rest-frame 2800 A luminosity density shows an increase by a factor of ～4 over the redshift range investigated. We estimate the SFR density to z ～ 2.2 from the 1500 and 2800 A luminosities. When no correction for extinction is made, we find that the SFR derived from the 2800 A luminosity density is almost a factor of 2 higher than that derived from the 1500 A luminosities. Attributing this difference to differential dust extinction, we find that E(B - V) = 0.20 results in the same extinction-corrected SFR from both 1500 and 2800 A luminosities. The extinction-corrected SFR is a factor of ～6.5 (～3.7) higher than the uncorrected SFR derived from 1500 A (2800 A) luminosity. We investigate the morphological composition of our sample by fitting Sersic profiles to the HSTACS galaxy images at a fixed rest-frame wavelength of 2800 A at 0.5 approx< z approx< 2.2. We find that the fraction of apparently bulge-dominated galaxies (Sersic index n > 2.5) increases from ～10% at z ～ 0.5 to ～30% at z ～ 2.2. At the same time, we note that galaxies get bluer at increasing redshift. This suggests a scenario where an increased fraction of the star formation takes place in bulge-dominated systems at high redshift. This could be evidence that the present-day elliptical galaxies are a result of assembly (i.e., mergers) of galaxies at z approx> 1. Finally, we find that galaxy size for a luminosity-selected sample evolves as r_h ∝ (1 + z)~(-1.1) between redshifts z = 2.2 and 1.1. This is consistent with previous measurements and suggests a similar evolution over the redshift range 0 approx< z approx< 6.
机译：利用在大天文台起源深部调查中获得的涵盖南钱德拉深场南的多波长光度和光谱数据，我们研究了星系的其余帧紫外线特性到z〜2.2，包括光度函数的演变，光度密度，恒星形成率（SFR）和星系形态。我们发现，在红移范围0.3约 2.5）的比例从z〜0.5的〜10％增加到z〜2.2的〜30％。同时，我们注意到，随着红移的增加，星系会变蓝。这表明在高红移条件下，在凸起为主的系统中发生恒星形成的比例增加的情况。这可以证明当今的椭圆星系是z约> 1时星系的组装（即合并）的结果。最后，我们发现，光度选择样本的星系大小随着r_h ∝（1 + z ）〜（-1.1）在红移z = 2.2和1.1之间。这与以前的测量结果一致，并表明在红移范围0近似

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