论文标题
ALMA光谱调查大型计划：红外Z = 1.5-10 UV选择的星系和隐含的高红移星形成历史记录
The ALMA Spectroscopic Survey Large Program: The Infrared Excess of z=1.5-10 UV-selected Galaxies and the Implied High-Redshift Star Formation History
论文作者
论文摘要
We make use of sensitive (9.3 microJy/beam RMS) 1.2mm-continuum observations from the ASPECS ALMA large program of the Hubble Ultra Deep Field (HUDF) to probe dust-enshrouded star formation from 1362 Lyman-break galaxies spanning the redshift range z=1.5-10 (to ~7-28 Msolar/yr at 4 sigma over the entire range).我们发现，在我们的Z = 1.5-10样品中，阿尔玛检测到的星系的比例随着恒星质量的增长而陡峭，检测分数从10^9 msolar的0％上升到85（-18）（-18）（+9）％，> 10^{10^{{10} msolar。此外，将所有1253个低质量（<10^{9.25} msolar）星系覆盖在Aspecs足迹上，我们发现平均连续通量为-0.1 +/- 0.4 microjy/beam/beam/beam，这意味着在<0.6 msolar/yr（4 sigma）中被遮盖的SFR上的硬上限，典型的SFR（4 sfor）典型的sfr。在我们的ASPECS数据中也可以看到UV选择星系（L（ir）/L（uv））的红外过量IRX与UV-Continuum斜率之间的相关性，并且在我们的ASPECS数据中也可以看到，并且与> 10^{9.5} M_ {Solar}的Calzetti样关系保持一致，并在smc smc-smc time smc-lowseles中的关系保持一致。在烛台上使用Z〜2星系的恒星质量和β测量，我们得出了β和恒星质量之间的新经验关系，然后使用此相关性表明我们的IRX-BETA和IRX-Stellar质量关系是彼此一致的。然后，我们使用这些约束来表达红外过量作为β和恒星质量的双变量功能。最后，我们介绍了Z> 3处的恒星形成速率密度确定的最新估计值，利用了测量的红外过量和最新探针的电流改善，并在Z> 2处进行了超光线的Far-Ir星系。
We make use of sensitive (9.3 microJy/beam RMS) 1.2mm-continuum observations from the ASPECS ALMA large program of the Hubble Ultra Deep Field (HUDF) to probe dust-enshrouded star formation from 1362 Lyman-break galaxies spanning the redshift range z=1.5-10 (to ~7-28 Msolar/yr at 4 sigma over the entire range). We find that the fraction of ALMA-detected galaxies in our z=1.5-10 samples increases steeply with stellar mass, with the detection fraction rising from 0% at 10^9 Msolar to 85(-18)(+9)% at >10^{10} Msolar. Moreover, stacking all 1253 low-mass (<10^{9.25} Msolar) galaxies over the ASPECS footprint, we find a mean continuum flux of -0.1+/-0.4 microJy/beam, implying a hard upper limit on the obscured SFR of <0.6 Msolar/yr (4 sigma) in a typical low-mass galaxy. The correlation between the infrared excess IRX of UV-selected galaxies (L(IR)/L(UV)) and the UV-continuum slope is also seen in our ASPECS data and shows consistency with a Calzetti-like relation at >10^{9.5} M_{solar} and a SMC-like relation at lower masses. Using stellar-mass and beta measurements for z~2 galaxies over CANDELS, we derive a new empirical relation between beta and stellar mass and then use this correlation to show that our IRX-beta and IRX-stellar mass relations are consistent with each other. We then use these constraints to express the infrared excess as a bivariate function of beta and stellar mass. Finally, we present updated estimates of star-formation rate density determinations at z>3, leveraging current improvements in the measured infrared excess and recent probes of ultra-luminous far-IR galaxies at z>2.
