A VLA SEARCH FOR CO AND HCN EMISSION FROM Z=4 QUASARS

Authors
BARVAINIS R ANTONUCCI R
Citation
R. Barvainis et R. Antonucci, A VLA SEARCH FOR CO AND HCN EMISSION FROM Z=4 QUASARS, Publications of the Astronomical Society of the Pacific, 108(720), 1996, pp. 187-189
Citations number
10
Categorie Soggetti
Astronomy & Astrophysics
Journal title
Publications of the Astronomical Society of the Pacific
ISSN journal
00046280 → ACNP
Volume
108
Issue
720
Year of publication
1996
Pages
187 - 189
Database
ISI
SICI code
0004-6280(1996)108:720<187:AVSFCA>2.0.ZU;2-M
Abstract
A search for CO(1-0) line emission from nine quasars and one radio gal axy at Z approximate to 4 has been conducted using the VLA. Also, one quasar at z = 4.7 was searched for HCN(1-0) emission. Velocity coverag e was >2000 km s(-1) in all cases. No detections were obtained, with u pper limits on peak line flux densities in the 2-5 mJy/beam range. Cor responding upper limits on molecular gas masses are typically several X 1011 Mo., assuming the standard Galactic CO to H-2 conversion factor and a CO linewidth of 300 km s(-1).