Observational limits on the gas mass of a z=4.9 galaxy
Livermore, R. C.
Bower, R. G.
Crain, R. A.
Geach, J. E.
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 +/- 5x 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/Advanced Camera for Surveys imaging and Gemini/NIFS [O Pi]3727 imaging spectroscopy, and obtain a tentative detection at the 4.3 sigma level with a flux of 0.104 +/- 0.024 Jy km s(-1). From the CO line luminosity and assuming a CO-to-H-2 conversion factor alpha = 2, we derive a gas mass M-gas similar to 1(-0.6)(+1) x 10(9) M-circle dot. Combined with the existing data, we derive a gas fraction M-gas/(M-gas + M-*) = 0.59+(+0.11)(-0.06). The faint line flux of this galaxy highlights the difficulty of observing molecular gas in representative galaxies 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.
Published inAstrophysical Journal Letters
MetadataShow full item record
Showing items related by title, author, creator and subject.
The H alpha galaxy survey. I. The galaxy sample, H alpha narrow-band observations and star formation parameters for 334 galaxies James, P.A.; Shane, N.S.; Beckman, J.E.; Cardwell, A.; Collins, C.A.; Etherton, J.; de Jong, R.S.; Fathi, K.; Knapen, J.; Peletier, R.F.; Percival, S.M.; Pollacco, D.L.; Seigar, M.S.; Stedman, S. (2004)We discuss the selection and observations of a large sample of nearby galaxies, which we are using to quantify the star formation activity in the local Universe. The sample consists of 334 galaxies across all Hubble types ...
On the Key Processes that Drive Galaxy Evolution: the Role of Galaxy Mergers, Accretion, Local Environment and Feedback in Shaping the Present-Day Universe Martin, Garreth (2019-07-17)The study of galaxy evolution is a fundamental discipline in modern astrophysics, dealing with how and why galaxies of all types evolve over time. The diversity of present-day galaxies is a reflection of the processes ...
MegaMorph - multiwavelength measurement of galaxy structure: Physically meaningful bulge-disc decomposition of galaxies near and far Vika, Marina; Bamford, Steven P.; Haussler, B.; Rojas, Alex L. (2014-11-11)