The Interchangeability of CO and H I in the Tully-Fisher Relation

Details The Interchangeability of CO and H I in the Tully-Fisher Relation The Interchangeability of CO and H I in the Tully-Fisher Relation

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....116.2672l&link_type=abstract

The Astronomical Journal, Volume 116, Issue 6, pp. 2672-2681.

Astronomy and Astrophysics

Astronomy

11

Cosmology: Distance Scale, Galaxies: Distances And Redshifts, Galaxies: Spiral

Scientific paper

We investigate the viability and precision of using ^12CO (J = 1 --> 0) emission lines from galaxies in lieu of 21 cm emission in the Tully-Fisher distance indicator (TF). Here we combine CO data gathered specifically for Tully-Fisher analysis with I-band photometry (both new and from the literature) for cluster galaxies between 3500 and 8000 km s^-1 and compare the luminosity-line width relation using CO with the results of recent, large TF surveys using H i and Hα. We cull some CO data as suggested by previously published numerical simulations and find that CO line widths, with corrections for turbulence and noise-broadening on the order of 35 km s^-1, behave identically to H i and Hα in luminosity-line width analyses. We also examine the relation between CO line shapes and other parameters of the galaxies.

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