Aperture synthesis CO (J = 3-2) observations of a protogalaxy candidate IRAS F10214+4724

Abstract

view Abstract Citations (25) References (17) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Aperture Synthesis CO (J = 3--2) Observations of a Protogalaxy Candidate IRAS F10214+4724 Kawabe, R. ; Sakamoto, K. ; Ishizuki, S. ; Ishiguro, M. Abstract We have made aperture synthesis CO (J = 3-2) observations of a protogalaxy candidate, IRAS F10214+4724, with a redshift z = 2.286 (Rowan-Robinson et al. 1991), using the Nobeyama Array in order to obtain a distribution of molecular gas. We have found that molecular gas with about 40% of the total CO single-dish flux is just associated with the optical galaxy at the redshift which is thought to be a source of the huge infrared luminosity, L_IR_ = 10^14^ L_sun_. The observations give evidence for a direct connection between an optical galaxy and the infrared source by analogy with nearby ultraluminous IR galaxies with large amounts of molecular gas. The distribution of molecular gas which the interferometer mapped was not resolved by our synthesized beam, 8.9" x 6.0" (corresponding to 36 h^-1^ kpc x 24 h^-1^ kpc, assuming H_0_ = 100 h km s^-1^ Mpc^-1^,q_0_ = 0.5). Our results indicate that metal-enriched molecular gas collapsed sufficiently, at least to the galaxy disk scale. The H2 mass associated with the galaxy is estimated to be (1-3) x 10^11^ h^-2 M_sun_. The gas consumption time scale, (1-3) x 10^7^ yr, is shorter than its dynamical time scale, (2-5) x 10^8^ h^-1^ yr, if we assume that the huge far-infrared luminosity originated from a starburst in this galaxy (the star formation rate is about 10^4^ M_sun_ yr^-1^). Events like merging of protogalactic clouds would trigger such star formation; however, the very short duration of the enhanced star formation might give us little opportunity to observe such an object. On the other hand, the long time scale of molecular gas consumption, (1.5-4) x 10^9^ yr, is inferred from a dust-enshrouded QSO model. Publication: The Astrophysical Journal Pub Date: September 1992 DOI: 10.1086/186535 Bibcode: 1992ApJ...397L..23K Keywords: Galactic Evolution; Galactic Structure; Infrared Sources (Astronomy); Interstellar Gas; Emission Spectra; Infrared Astronomy Satellite; Molecular Gases; Red Shift; Star Formation; Astrophysics; GALAXIES: FORMATION; GALAXIES: INDIVIDUAL ALPHANUMERIC: IRAS F10214; 4724; INFRARED: GALAXIES; ISM: MOLECULES; RADIO LINES: MOLECULAR: INTERSTELLAR full text sources ADS | data products SIMBAD (1) NED (1)