New constraints on the molecular gas content of a z ∼ 8 galaxy from JVLA CO(J=2-1) observations

被引:3
作者
Jones, Gareth C. [1 ]
Witstok, Joris [2 ,3 ]
Concas, Alice [4 ]
Laporte, Nicolas [2 ,3 ]
机构
[1] Univ Oxford, Dept Phys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England
[2] Univ Cambridge, Kavli Inst Cosmol, Madingley Rd, Cambridge CB3 0HA, England
[3] Univ Cambridge, Cavendish Lab, 19 JJ Thomson Ave, Cambridge CB3 0HE, England
[4] European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany
基金
英国科研创新办公室; 欧洲研究理事会;
关键词
galaxies: high-redshift; galaxies: ISM; radio continuum: galaxies; ALMA SPECTROSCOPIC SURVEY; CO LUMINOSITY FUNCTIONS; STAR-FORMING GALAXIES; DUSTY STARBURST; MAIN-SEQUENCE; EMISSION; MASS; FEEDBACK; CO(1-0); EXCITATION;
D O I
10.1093/mnrasl/slad189
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
As the primary fuel for star formation, molecular gas plays a key role in galaxy evolution. A number of techniques have been used for deriving the mass of molecular reservoirs in the early Universe (e.g. [C II]158 mu m, [C I], dust continuum), but the standard approach of CO-based estimates has been limited to a small number of galaxies due to the intrinsic faintness of the line. We present Jansky Very Large Array observations of the galaxy MACS0416_Y1, targeting CO(2-1) and rest-frame radio continuum emission, which result in upper limits on both quantities. Adding our continuum limit to the published far-infrared (FIR) spectral energy distribution, we find a small non-thermal contribution to the FIR emission, a low-dust mass (log(10)(M-D/M-circle dot) similar to 5), and an abnormally high-dust temperature (T-D greater than or similar to 90 K) that may indicate a recent starburst. Assuming a low metallicity (Z/Z(circle dot) similar to 0.25), we find evidence for M-H2, CO less than or similar to 10(10) M-circle dot, in agreement with previous [C II] investigations (M-H2, [C II] similar to 10(9.6) M-circle dot). Upcoming JWST observations of this source will result in a precise determination of Z, enabling better constraints and an unprecedented view of the gaseous reservoir in this primordial starburst galaxy.
引用
收藏
页码:L1 / L6
页数:6
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