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

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 Multiplication-Sign 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 II]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{sup -1}. From the CO line luminosity and assuming a CO-to-H{sub 2} conversion factor {alpha} = 2, we derive a gas mass M{sub gas} {approx} 1{sup +1}{sub -0.6} Multiplication-Sign 10{sup 9} M{sub Sun }. Combined with the existing data, we derive a gas fraction M{sub gas}/(M{sub gas} + M{sub *}) = 0.59{sup +0.11}{sub -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.

Authors:
; ; ; ; ; ; ;  [1];  [2]
  1. Institute for Computational Cosmology, Durham University, South Road, Durham DH1 3LE (United Kingdom)
  2. Centre for Astrophysics and Supercomputing, Swinburne University of Technology, P.O. Box 218, Hawthorn, Victoria 3122 (Australia)
Publication Date:
OSTI Identifier:
22078484
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 758; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CAMERAS; CARBON MONOXIDE; DETECTION; EMISSION; GALAXIES; HYDROGEN; LUMINOSITY; MASS; MOLECULES; RED SHIFT; SPECTROSCOPY; STARS; TELESCOPES

Citation Formats

Livermore, R. C., Swinbank, A. M., Smail, Ian, Bower, R. G., Coppin, K. E. K., Edge, A. C., Geach, J. E., Richard, J., and Crain, R. A. OBSERVATIONAL LIMITS ON THE GAS MASS OF A z = 4.9 GALAXY. United States: N. p., 2012. Web. doi:10.1088/2041-8205/758/2/L35.
Livermore, R. C., Swinbank, A. M., Smail, Ian, Bower, R. G., Coppin, K. E. K., Edge, A. C., Geach, J. E., Richard, J., & Crain, R. A. OBSERVATIONAL LIMITS ON THE GAS MASS OF A z = 4.9 GALAXY. United States. doi:10.1088/2041-8205/758/2/L35.
Livermore, R. C., Swinbank, A. M., Smail, Ian, Bower, R. G., Coppin, K. E. K., Edge, A. C., Geach, J. E., Richard, J., and Crain, R. A. Sat . "OBSERVATIONAL LIMITS ON THE GAS MASS OF A z = 4.9 GALAXY". United States. doi:10.1088/2041-8205/758/2/L35.
@article{osti_22078484,
title = {OBSERVATIONAL LIMITS ON THE GAS MASS OF A z = 4.9 GALAXY},
author = {Livermore, R. C. and Swinbank, A. M. and Smail, Ian and Bower, R. G. and Coppin, K. E. K. and Edge, A. C. and Geach, J. E. and Richard, J. and Crain, R. A.},
abstractNote = {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 Multiplication-Sign 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 II]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{sup -1}. From the CO line luminosity and assuming a CO-to-H{sub 2} conversion factor {alpha} = 2, we derive a gas mass M{sub gas} {approx} 1{sup +1}{sub -0.6} Multiplication-Sign 10{sup 9} M{sub Sun }. Combined with the existing data, we derive a gas fraction M{sub gas}/(M{sub gas} + M{sub *}) = 0.59{sup +0.11}{sub -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.},
doi = {10.1088/2041-8205/758/2/L35},
journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 2,
volume = 758,
place = {United States},
year = {2012},
month = {10}
}