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CO Observations of High-z Objects

Published online by Cambridge University Press:  25 May 2016

K. Ohta
Affiliation:
Dept. of Astronomy, Kyoto Univ., Kyoto 606-01, Japan
K. Nakanishi
Affiliation:
Dept. of Astronomy, Kyoto Univ., Kyoto 606-01, Japan
M. Akiyama
Affiliation:
Dept. of Astronomy, Kyoto Univ., Kyoto 606-01, Japan
T.T. Takeuchi
Affiliation:
Dept. of Astronomy, Kyoto Univ., Kyoto 606-01, Japan
T. Yamada
Affiliation:
Astronomical Institute, Tohoku Univ., Sendai 980-77, Japan
Y. Shioya
Affiliation:
Astronomical Institute, Tohoku Univ., Sendai 980-77, Japan
K. Kohno
Affiliation:
Nobeyama Radio Observatory, Nagano 384-13, Japan
R. Kawabe
Affiliation:
Nobeyama Radio Observatory, Nagano 384-13, Japan
N. Kuno
Affiliation:
Nobeyama Radio Observatory, Nagano 384-13, Japan
N. Nakai
Affiliation:
Nobeyama Radio Observatory, Nagano 384-13, Japan

Extract

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We have made a CO(J=2-1) observations using the Nobeyama 45m telescope aimed at examining the physical properties of the molecular gas in this object. The upper limit obtained is 1.8 mK (3σ) at a velocity resolution of 100 km s−1, which leads to an upper limit on the molecular gas mass of 5.3 × 1011M, if we assume a line width of 250 km s−1 obtained in the CO(J = 5 - 4) line (rest-frame) and the Galactic CO-to-H2 conversion factor of 4.5 (M K km s−1 pc2). The line ratio between the 2–1 line and the 5–4 line as well as those from the 7–6 and the 4–3 lines (Omont et al. 1996, Nature, 382, 428) imply that the mean gas density is as high as 103–5 cm−3, which is comparable to that in nearby star burst galaxies (e.g., Solomon et al. 1992, ApJ, 387, L55).

Type
Nuclear Activity
Copyright
Copyright © Kluwer 1999