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首页> 外文期刊>The Astrophysical journal >Hα OBSERVATIONS OF A LARGE SAMPLE OF GALAXIES AT z ～ 2: IMPLICATIONS FOR STAR FORMATION IN HIGH-REDSHIFT GALAXIES
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Hα OBSERVATIONS OF A LARGE SAMPLE OF GALAXIES AT z ～ 2: IMPLICATIONS FOR STAR FORMATION IN HIGH-REDSHIFT GALAXIES

机译：z〜2处大样本星系的Hα观测：高引力星系中恒星形成的含义

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摘要

Using Hα spectra of 114 rest-frame UV-selected galaxies at z ～ 2, we compare inferred star formation rates (SFRs) with those determined from the UV continuum luminosity. After correcting for extinction using standard techniques based on the UV continuum slope, we find excellent agreement between the indicators, with < SFR_(Hα) > =31 solar mass yr~(-1) and < SFR_(UV) > = 29 solar mass yr~(-1). The agreement between the indicators suggests that the UV luminosity is attenuated by a typical factor of ～4.5 (ranging from no attenuation to a factor of ～100 for the most obscured object in the sample), in good agreement with estimates of obscuration from X-ray, radio, and mid-IR data. The Hα luminosity is attenuated by a factor of ～1.7 on average, and the maximum Hα attenuation is a factor of ～5. In agreement with X-ray and mid-IR studies, we find that the SFR increases with increasing stellar mass and at brighter K magnitudes to < SFR_(Hα) > ～ 60 solar mass yr~(-1) for galaxies with K_s < 20; the correlation between K magnitude and SFR is much stronger than the correlation between stellar mass and SFR. All galaxies in the sample have SFRs per unit area Σ_(SFR) in the range observed in local starbursts. We compare the instantaneous SFRs and the past average SFRs as inferred from the ages and stellar masses, finding that for most of the sample, the current SFR is an adequate representation of the past average. There is some evidence that the most massive galaxies (M_* > 10~(11) solar mass) have had higher SFRs in the past.
机译：利用114个静止构架的紫外线选星系在z〜2处的Hα光谱，我们将推断的恒星形成率（SFR）与由紫外线连续性光度确定的恒星形成率进行了比较。在使用基于紫外线连续谱斜率的标准技术校正消光之后，我们发现指标之间具有极好的一致性，其中 = 31太阳质量yr〜（-1）和 = 29太阳质量yr〜（-1）。各项指标之间的一致性表明，紫外光度的衰减典型值为〜4.5（对于样品中最模糊的物体，其衰减从无衰减到约​​100的范围不等），与X-射线，无线电和中红外数据。 Hα光度平均衰减约1.7，最大Hα衰减约5。与X射线和中红外研究一致，我们发现对于K_s <20的星系，恒星形成率随着恒星质量的增加而增加，并且在更亮的K值下达到〜60太阳质量yr〜（-1）。 ; K量与SFR之间的相关性比恒星质量与SFR之间的相关性强得多。样本中的所有星系的每单位面积SFR都在局部星暴中观察到的范围内Σ_（SFR）。我们比较了根据年龄和恒星质量推断的瞬时SFR和过去的平均SFR，发现对于大多数样本而言，当前的SFR足以代表过去的平均值。有证据表明，过去最大的星系（M_ *> 10〜（11）太阳质量）具有更高的SFR。

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