The 75-111 GHz Spectra of Ten Nearby Galaxies Obtained with the Redshift Search Receiver

Details The 75-111 GHz Spectra of Ten Nearby Galaxies Obtained with the Redshift Search Receiver The 75-111 GHz Spectra of Ten Nearby Galaxies Obtained with the Redshift Search Receiver

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21441907s&link_type=abstract

American Astronomical Society, AAS Meeting #214, #419.07; Bulletin of the American Astronomical Society, Vol. 41, p.689

Astronomy and Astrophysics

Astronomy

Scientific paper

The three-millimeter-wavelength spectra of ten nearby galaxies have been obtained at the Five College Radio Astronomy Observatory (FCRAO) using a new, very broadband receiver and spectrometer. This instrument, which we call the Redshift Search Receiver (RSR), has an instantaneous bandwidth of 36 GHz covering wavelengths from 75 to 111 GHz, and has a spectral resolution of 31 MHz ( 100 km/s). The RSR is being build as one of the facility instruments for the Large Millimeter Telescope and designed primarily to determine the redshift of distant, dust-obscured galaxies. Tests of the RSR on the FCRAO 14-m telescope provided an opportunity to obtain complete three-millimeter spectra of the central regions of 10 nearby galaxies, Within the wavelength band covered by the RSR we detected 20 spectral lines from 14 different atomic and molecular species. We present the results of this spectral survey, examine some key molecular line ratios and discuss how differences in the chemistry and physical properties might give rise to the observed variation in these line ratios.

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