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 W_{20}^c=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 I_T-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 H_0=73 +/- 4 km/s/Mpc.