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Published June 10, 2016 | Published + Submitted
Journal Article Open

Highest Redshift Image of Neutral Hydrogen in Emission: A CHILES Detection of a Starbursting Galaxy at z = 0.376


Our current understanding of galaxy evolution still has many uncertainties associated with the details of the accretion, processing, and removal of gas across cosmic time. The next generation of radio telescopes will image the neutral hydrogen (H i) in galaxies over large volumes at high redshifts, which will provide key insights into these processes. We are conducting the COSMOS H i Large Extragalactic Survey (CHILES) with the Karl G. Jansky Very Large Array, which is the first survey to simultaneously observe H i from z = 0 to z ~ 0.5. Here, we report the highest redshift H i 21 cm detection in emission to date of the luminous infrared galaxy COSMOS J100054.83+023126.2 at z = 0.376 with the first 178 hr of CHILES data. The total H i mass is (2.9 ± 1.0) × 10^(10) M_⊙ and the spatial distribution is asymmetric and extends beyond the galaxy. While optically the galaxy looks undisturbed, the H i distribution suggests an interaction with a candidate companion. In addition, we present follow-up Large Millimeter Telescope CO observations that show it is rich in molecular hydrogen, with a range of possible masses of (1.8–9.9) × 10^(10) M_⊙. This is the first study of the H i and CO in emission for a single galaxy beyond z ~ 0.2.

Additional Information

© 2016 The American Astronomical Society. Received 2016 January 25; revised 2016 April 27; accepted 2016 May 3; published 2016 June 2. We thank the referee for constructive feedback that helped us improve the paper. We acknowledge useful discussions with Andrew Baker and George Privon. CHILES is supported by NSF grants AST-1413102, AST-1412578, AST-1412843, AST-1413099 and AST-1412503. X.F. is supported by an NSF-AAPF under award AST-1501342. L.C. and E.T. acknowledge support from NSF grant AST-1412549. K.H. was supported by the ERC under the EU's Seventh Framework Programme (FP/2007-2013)/ERC Grant Agreement nr. 291531. K.K. acknowledges grants KR 4598/1-2 and SCHI 536/8-2 from the DFG Priority Program 1573. Y.J. acknowledges the Marie Curie Actions of the European Commission (FP7-COF). This work would not have been possible without the long-term financial support from the Mexican Science and Technology Funding Agency, CONACYT during the construction and early operational phase of the Large Millimeter Telescope Alfonso Serrano, as well as support from the the US NSF via the URO program, the INAOE and UMASS-Amherst. Based on observations obtained at the SOAR telescope, which is a joint project of the MCTI da República Federativa do Brasil, NOAO, UNC-Chapel Hill, and MSU.

Attached Files

Published - apjl_824_1_L1.pdf

Submitted - 1606.00013v1.pdf


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