COMPACT STARBURSTS IN z ∼ 3 ?> –6 SUBMILLIMETER GALAXIES REVEALED BY ALMA-猫眼课题宝

DOI：

10.1088/0004-637x/810/2/133

发表时间：

2014-11

期刊：

The Astrophysical Journal

影响因子：

通讯作者：

中科院分区：

其他

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作者：

S. Ikarashi;R. Ivison;K. Caputi;I. Aretxaga;J. Dunlop;B. Hatsukade;D. Hughes;D. Iono;T. Izumi;R. Kawabe;K. Kohno;C. Lagos;K. Motohara;K. Nakanishi;K. Ohta;Y. Tamura;H. Umehata;G. Wilson;K. Yabe;Min S. Yun European Southern Observatory;I. O. Astronomy;U. Tokyo;K. Institute;U. Groningen;Institute for Astronomy;U. Edinburgh;R. Observatory;Inaoe;N. A. O. Japan;Sokendai;Research Center for the Early Universe;School of Materials Science;Joint Alma Observatory;D. O. Astronomy;K. University;U. O. Massachusetts

我们报告的源尺寸分布，测量阿尔马毫米连续成像，13个AzTEC选择的亚毫米星系（SMGs）的样品在z phot 3.3？> -6.它们的红外光度和星星形成率（SFR）分别为L IR？> 2-6 × 10 12？> L？> 200-600 M的？> yr-1，分别。这些SMG的大小范围从0.“10到0.”38，中值为0.“20 − 0 05 + 0 03？>（FWHM），对应于中值圆化有效半径（Rc，e？> 0.67 − 0.14 + 0.13？kpc，与z 2处致密静止星系中测量的恒星成分的典型尺寸相当？>（cQGs）- R e 1？>科索沃保护团。我们的SMG的表面SFR密度中值为100 − 26 + 42？> M？> yr−1 kpc−2，与本地合并驱动的（U）LIRG相比，而不是在低和高红移的扩展盘星系中看到的。在z 103中发现致密星暴？> SMG强烈支持一个大规模的星系形成的情况下，其中z 3？> -6 SMG演化为z 2？>的致密恒星成分。cQG。这些cQG然后被认为演变成当地宇宙中最大的椭圆星系，主要是通过干合并。因此，我们的研究结果表明，z 3？> SMG可能是大质量局部椭圆星系的祖先，通过cQG，这意味着我们现在可以追踪最大质量星系的演化路径，涵盖宇宙年龄的90%。

We report the source size distribution, as measured by ALMA millimetric continuum imaging, of a sample of 13 AzTEC-selected submillimeter galaxies (SMGs) at z phot ∼ 3 ?> –6. Their infrared luminosities and star formation rates (SFRs) are L IR ∼ ?> 2– 6 × 10 12 ?> L ⊙ ?> and ∼200–600 M ⊙ ?> yr−1, respectively. The sizes of these SMGs range from 0.″10 to 0.″38, with a median of 0.″20 − 0 05 + 0 03 ?> (FWHM), corresponding to a median circularized effective radius ( R c , e ?> ) of 0.67 − 0.14 + 0.13 ?> kpc, comparable to the typical size of the stellar component measured in compact quiescent galaxies at z ∼ 2 ?> (cQGs)— R e ∼ 1 ?> kpc. The median surface SFR density of our SMGs is 100 − 26 + 42 ?> M ⊙ ?> yr−1 kpc−2, comparable to that seen in local merger-driven (U)LIRGs rather than in extended disk galaxies at low and high redshifts. The discovery of compact starbursts in z ≳ 3 ?> SMGs strongly supports a massive galaxy formation scenario wherein z ∼ 3 ?> –6 SMGs evolve into the compact stellar components of z ∼ 2 ?> cQGs. These cQGs are then thought to evolve into the most massive ellipticals in the local universe, mostly via dry mergers. Our results thus suggest that z ≳ 3 ?> SMGs are the likely progenitors of massive local ellipticals, via cQGs, meaning that we can now trace the evolutionary path of the most massive galaxies over a period encompassing ∼90% of the age of the universe.

COMPACT STARBURSTS IN z ∼ 3 ?> –6 SUBMILLIMETER GALAXIES REVEALED BY ALMA

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