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OBSERVATIONAL LIMITS ON THE GAS MASS OF A z=4.9 GALAXY

Livermore, RC and Swinbank, AM and Smail, I and Bower, RG and Coppin, KEK and Crain, RA and Edge, AC and Geach, JE and Richard, J (2012) OBSERVATIONAL LIMITS ON THE GAS MASS OF A z=4.9 GALAXY. ASTROPHYSICAL JOURNAL LETTERS, 758 (2). pp. 1-5. ISSN 2041-8205

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Abstract

We present the results of a search for molecular gas emission from a star-forming galaxy at z = 4.9. The galaxy benefits from magnification of 22±5× due to strong gravitational lensing by the foreground cluster MS1358+62. We target the CO(5–4) emission at a known position and redshift from existing Hubble Space Telescope/ACS imaging and Gemini/NIFS [Oii]3727 imaging spectroscopy, and obtain a tentative detection at the 4.3 � level with a flux of 0.104±0.024 Jy kms−1. From the CO line luminosity and assuming a CO-to-H2 conversion factor = 2,we derive a gas mass Mgas � 1+1−0.6× 109M⊙. Combined with the existing data, we derive a gas fraction Mgas/ (Mgas +M∗) = 0.59+0.11−0.06. The faint line flux of this galaxy highlights the difficulty of observing molecular gas in representativegalaxies at this epoch, and suggests that routine detections of similar galaxies in the absence of gravitational lensing will remain challenging even with ALMA in full science operations.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: IOP PUBLISHING LTD
Related URLs:
Date Deposited: 13 Feb 2015 08:56
Last Modified: 13 Feb 2015 08:56
DOI or Identification number: 10.1088/2041-8205/758/2/L35
URI: http://researchonline.ljmu.ac.uk/id/eprint/456

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