Surface Photometric Calibration of the Infrared Tully-Fisher Relation Using Cepheid-based Distances of Galaxies
Abstract
Infrared J and H surface photometry are carried out for nearby 12 galaxies whose distances have been accurately measured via HST Cepheid observations. Using the total, isophotal, and surface-photometric aperture magnitudes we calibrate the infrared luminosity-line width relation (IRTF). It is found that IRTF changes its slope at log W20c=2.45 in all the examined magnitude systems. The apparent scatter of IRTF is not significantly reduced when surface photometric magnitudes are used instead of the conventionally used synthetic aperture magnitude H-0.5. It is also shown that the color (I-H)T of the nearby calibrator galaxies is redder by 0.2mag than the Coma cluster galaxies, but such a trend is not clearly visible for the Ursa Major mostly because of poor statistics. The color offset of the Coma is analogous to that previously found in IT-H-0.5. From the present calibration of H-band IRTF, we obtain the distance to the Coma cluster to be m-M=34.94 +/- 0.13mag, where no account is taken of the I-H color problem. Using the CMB-rest recession velocity of the Coma cluster we obtain H0=73 +/- 4 km/s/Mpc.
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