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For refcode 1994AJ....108.1987A:
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1994AJ....108.1987A CCD CALIBRATION OF THE MAGNITUDE SCALE FOR THE SSRS2 SAMPlE: THE EQUATORIAL REGION M. VICTORIA ALONS0 Observatorio Nacional, Rio de Janeiro, Brazil and Observatorio Astronomico de Cordoba, Argentina Electronic mail: vicky@on.br L. NICOLACI DA COSTA Observatorio Nacional, Rio de Janeiro, Brazil and Institut d'Astrophysique, Paris, France Electronic mail: ldacosta@iap.fr DAVE W. LATHAM Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138 Electronic mail: latham@cfa.harvard.edu PAULO S. PELLEGRINI Observatorio Nacional, Rio de Janeiro, Brazil Electronic mail: pssp@on.br ALEJANDRA A. E. MILONE Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138 Electronic mail: milone@cfa.harvard.edu Received 1994 May 25; revised 1994 July 19 ABSTRACT In this paper we continue our investigation on the isophotal nature, accuracy, and uniformity of the magnitude system adopted in the Southern Sky Redshift Survey extension (SSRS2). Extending our earlier work, we examine galaxies in the equatorial region, primarily in the declination range - 17.5^deg^ <= {delta} <= 0^deg^, over a large range of right ascension, covering the southern and northern Galactic caps. For this purpose, we have obtained CCD isophotal magnitudes in the B and R bands for 265 galaxies of different morphological types. Using this larger sample we confirm our earlier claim that the m_SSRS2_ magnitudes are very nearly the magnitude measured within the isophote {mu}_B_ = 26 mag arcsec^-2^, with a dispersion of about 0.30 mag. The relative zero-point offset between our m_SSRS2_ magnitudes and the CCD photometry is -0.02 mag from all data we have obtained. However, we detect a variation of the zero-point across different regions of the sky of +/-0.10 mag for regions at large angular separations. We also estimate that the zero-point offset between the m_SSRS2_ and Zwicky systems is relatively small (~ 0.10 mag), which should allow us to combine the data from the SSRS2 and the CfA2 Redshift Survey.
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