A Search for the CO (J = 1-0) Emission Line toward the Quasar H1413+117

Details A Search for the CO (J = 1-0) Emission Line toward the Quasar H1413+117 A Search for the CO (J = 1-0) Emission Line toward the Quasar H1413+117

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pasj...51..479t&link_type=abstract

Publications of the Astronomical Society of Japan, v.51, p.479-482.

Astronomy and Astrophysics

Astronomy

6

Cosmology, Galaxies: Gravitational Lenses, Galaxies: Quasars: Individual (H1413+117), Interstellar: Molecules

Scientific paper

We have searched for the CO (J = 1-0) line emission toward the gravitational lensed ``Cloverleaf'' quasar, H1413+117, at z = 2.56 using the 45-m telescope of Nobeyama Radio Observatory. The r.m.s. noise of the resultant spectrum was 1\ sigma_rms = 0.6 mK in T_MB or 1.6 mJy for a velocity resolution of 50 km s-1. We obtained the 5 sigma_rms upper limit of the velocity-integrated CO (J = 1-0) line flux, displaystyle int S1-0dv <= 1.4 Jy km s-1. The lower limit of the intrinsic ratio of the brightness temperature is T_B[ CO\ (J = 3-2)]/T_B[ CO\ (J = 1-0)] >= 0.79 at z = 2.56. This value corresponds to T_B[CO\ (J = 3-2)]/T_B[CO\ (J = 1-0)] >= 0.72-0.75 at z = 0 from a LVG calculation. This temperature ratio is consistent with those in the central regions of nearby IR luminous galaxies.

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