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For refcode 1997MNRAS.291..461S:
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Copyright by Royal Astronomical Society. 1997MNRAS.291..461S Galaxy clusters in the Perseus-Pisces region - Spectroscopic and photometric data for early-type galaxies R. J. Smith, J. R. Lucey, M. J. Hudson and J. Steel Accepted 1997 June 18. Received 1997 June 13; in original form 1996 October 2 ABSTRACT We present new spectroscopic and photometric data for 137 early-type galaxies in nine clusters, and for a set of nearby standard galaxies. The clusters studied are Perseus (A0426), Pisces, A0262, A0347, J8, HMS0122+3305, 7521, A2199 and A2634. Our spectroscopic data comprise radial velocities (cz), central velocity dispersions (a) and magnesium line strength indices (Mg2). Internal errors (derived from repeat observations) are 7.6 per cent on each measurement of velocity dispersion, and 0.010 mag on each Mg_2_ measurement. Following Jorgensen, Franx & Kjaergaard we correct our {sigma} and Mg_2_ results to a physical aperture size of 1.19 h^-1^ kpc. We correct the major published data sets to the same aperture size, and define a new `standard system' by the aperture-corrected Lick data of Davies et al. Through extensive intercomparisons with data from the literature, we present the corrections required to bring the major published data sets on to the standard system. The uncertainty in these corrections is computed. We demonstrate that our new velocity dispersion data can be brought into consistency with the standard system, to an uncertainty of < 0.01 dex. From R-band CCD photometry we derive the effective diameter (A_e_), the mean surface brightness within the effective diameter <({mu}>_e)_ and an R-band diameter equivalent to the D_n_ parameter of Dressler et al. Internal comparisons indicate an average error of 0.005 in each measurement of logD_n_. The combination log A_e_ - 0.3 {{mu}>_e_. approximately the quantity used in the Fundamental Plane distance indicator, has an uncertainty of 0.006 per measurement. The photometric data can be brought on to a system consistent with external data at the level of 0.5 per cent in distance. These data will be used in a companion paper, to derive distance and peculiar velocity estimates for the nine clusters studied. Key words: galaxies: clusters: general - galaxies: distances and redshifts - galaxies: elliptical and lenticular, cD - galaxies: fundamental parameters.
Retrieve 212 NED objects in this reference.
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