Astronomy and Astrophysics – Astronomy
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...184.6102l&link_type=abstract
American Astronomical Society, 184th AAS Meeting, #61.02; Bulletin of the American Astronomical Society, Vol. 26, p.960
Astronomy and Astrophysics
Astronomy
Scientific paper
We are studying the feasibility of using the CO lambda 1.3 mm and lambda 2.6 mm lines for performing Tully-Fisher calculations on galaxies in distant rich clusters. Previous Tully-Fisher calculations have depended on lambda 21 cm linewidths. In rich cluster environments, however, the HI disks of spirals are disrupted or even stripped due to interactions with the intergalactic medium. The molecular gas is more tightly bound to the center of the disk, and so CO does not suffer these effects. Using data obtained with the IRAM-Granada 30-m dish, we detected CO in 13 out of the 32 galaxies searched in the Hercules cluster (z = 0.03). Our detections have a lower gas-mass limit of 0.5 K-km/s or about 4x10(8) Msun; the strongest detections indicate masses of approximately 2x10(9) Msun. As these are very weak sources, our integration times went as high as 128 minutes. Our preliminary findings are that the CO line-centers agree with those of HI to within 2sigma and the linewidths agree to within 1sigma . This indicates that CO linewidths can be used at least as reliably as HI for distance determinations, which becomes important for those galaxies where reliable HI data is not available, due to environmental effects. Also, we detected CO in four galaxies in which HI has not been seen, allowing us to obtain their distances for the first time.
Dickey John M.
Lavezzi T. E.
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