Multiple CO Transitions , CI , and HCN from the Cloverleaf Quasar

@inproceedings{Barvainis1997MultipleCT,
  title={Multiple CO Transitions , CI , and HCN from the Cloverleaf Quasar},
  author={Richard Barvainis and Philip Maloney CASA and Robert R. J. Antonucci},
  year={1997}
}
New millimeter-wavelength emission lines are reported for the Cloverleaf (H1413+117), a gravitationally lensed quasar at redshift 2.56. High signal-to-noise ratio spectra of four lines in CO (J = 3 → 2, 4 → 3, 5 → 4, and 7 → 6) have been obtained and are modelled using an escape probability formalism. The line brightness temperatures are flat or rising between CO(3→ 2) and CO(4 → 3) and then drop to the CO(5→ 4) and CO(7→ 6) lines; this falloff suggests that the optical depths in the CO lines… CONTINUE READING