I-Band CCD Surface Photometry and a Total Magnitude for M31

Details I-Band CCD Surface Photometry and a Total Magnitude for M31 I-Band CCD Surface Photometry and a Total Magnitude for M31

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...184.4807g&link_type=abstract

American Astronomical Society, 184th AAS Meeting, #48.07; Bulletin of the American Astronomical Society, Vol. 26, p.938

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We present accurate I-band surface photometry of the nearby spiral galaxy M31. A 4(degtimes3 ^deg) image of this galaxy, at 2'' resolution, has been constructed by mosaicking together 41 2048times2048 CCD frames obtained using the KPNO/CWRU Burrell Schmidt telescope. The individual CCD frames have an unvignetted, circular field of view of ~ 1(deg) diameter; generous overlap between the 41 CCD frames allows them to be matched to one another with a high degree of accuracy. The distinctive features of our dataset are: (1) the wide angular extent of the image makes accurate determination of the ``sky'' background possible; and (2) the relatively high angular resolution (2'') enables identification and removal of bright foreground stars. By measuring the total magnitude of M31, we are able to calibrate the I-band Tully-Fisher relation for spiral galaxies in the Coma supercluster, and thereby estimate the value of the Hubble constant (H_0).

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