Total molecular gas masses of Planck - Herschel selected strongly lensed hyper luminous infrared galaxies

被引：31
作者：
Harrington, K. C. [1 ,2 ]
Yun, M. S. [3 ]
Magnelli, B. [2 ]
Frayer, D. T. [4 ]
Karim, A. [2 ]
Weiss, A. [1 ]
Riechers, D. [5 ]
Jimenez-Andrade, E. F. [1 ,2 ]
Berman, D. [3 ]
Lowenthal, J. [6 ]
Bertoldi, F. [2 ]
机构：
[1] Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany
[2] Argelander Inst Astron, Hugel 71, D-53121 Bonn, Germany
[3] Univ Massachusetts, Dept Astron, 619E Lederle Grad Res Tower,710 N Pleasant St, Amherst, MA 01003 USA
[4] Green Bank Observ, 155 Observ Rd, Green Bank, WV 24944 USA
[5] Cornell Univ, Dept Astron, Space Sci Bldg, Ithaca, NY 14853 USA
[6] Smith Coll, Dept Astron, Northampton, MA 01063 USA
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2018年 / 474卷 / 03期
关键词：
galaxies: high-redshift; galaxies: ISM; galaxies: starburst; STAR-FORMING GALAXIES; FREE-FREE EMISSION; SUBMILLIMETER GALAXIES; CO; REDSHIFT; DUSTY; CO(1-0); POPULATION; RESERVOIRS; SCIENCE;
D O I：
10.1093/mnras/stx3043
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We report the detection of CO(1-0) line emission from seven Planck and Herschel selected hyper luminous (LIR(8-1000 mu m) > 10(13) L-circle dot) infrared galaxies with the Green Bank Telescope (GBT). CO(1-0) measurements are a vital tool to trace the bulk molecular gas mass across all redshifts. Our results place tight constraints on the total gas content of these most apparently luminous high-z star-forming galaxies (apparent IR luminosities of L-IR > 10(13-14) L-circle dot), while we confirm their predetermined redshifts measured using the Large Millimeter Telescope, LMT (zCO = 1.33-3.26). The CO(1-0) lines show similar profiles as compared to J(up) = 2-4 transitions previously observed with the LMT. We report enhanced infrared to CO line luminosity ratios of < L-IR/L '(CO(1-0))> = 110 +/- 22 L-circle dot (K km s(-1) pc(-2))(-1) compared to normal star-forming galaxies, yet similar to those of well-studied IR-luminous galaxies at high-z. We find average brightness temperature ratios of < r(21)> = 0.93 (2 sources), < r(31)> = 0.34 (5 sources), and < r(41)> = 0.18 (1 source). The r(31) and r(41) values are roughly half the average values for SMGs. We estimate the total gas mass content as mu M-H2 = (0.9-27.2) x 10(11)(alpha(CO)/0.8) M-circle dot, where mu is the magnification factor and mu(CO) is the CO line luminosity to molecular hydrogen gas mass conversion factor. The rapid gas depletion times, <tau depl > = 80 Myr, reveal vigorous starburst activity, and contrast the Gyr depletion time-scales observed in local, normal star-forming galaxies.
引用
收藏
页码：3866 / 3874
页数：9
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