Molecular Lines as Diagnostics of High Redshift Objects

Details Molecular Lines as Diagnostics of High Redshift Objects Molecular Lines as Diagnostics of High Redshift Objects

1997-08-20

arxiv.org/abs/astro-ph/9708186v1

Astronomy and Astrophysics

Astrophysics

15 pages LaTex, uses aasms4.sty, Accepted by ApJL

Scientific paper

10.1086/310932

Models are presented for CO rotational line emission by high redshift starburst galaxies. The influence of the cosmic microwave background on the thermal balance and the level populations of atomic and molecular species is explicitly included. Predictions are made for the observability of starburst galaxies through line and continuum emission between z=5 and z=30. It is found that the Millimeter Array could detect a starburst galaxy with ~10^5 Orion regions, corresponding to a star formation rate of about 30 Mo yr^{-1}, equally well at z=5 or z=30 due to the increasing cosmic microwave background temperature with redshift. Line emission is a potentially more powerful probe than dust continuum emission of very high redshift objects.

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