For refcode 1993AJ....105.1358S: Retrieve 3 NED objects in this reference. Please click here for ADS abstract
NED Abstract
Copyright by American Astronomical Society.
Reproduced by permission
1993AJ....105.1358S
A MAXIMUMLIKELIHOOD ANALYSIS OF GLOBULAR CLUSTER LUMINOSITY
DISTRIBUTIONS IN THE VIRGO ELLIPTICALS
JEFF SECKER AND WILLIAM E. HARRIS
Department of Physics and Astronomy, McMaster University, Hamilton,
Ontario, Canada L8S 4Ml
Received 1992 October 29; revised 1992 December 11
ABSTRACT
We have formulated a model to represent globular cluster luminosity
functions (GCLFs) in distant galaxies by means of maximumlikelihood
statistics. This model simultaneously accounts for the presence of a
contaminating background population, incompleteness at faint magnitudes,
and photometric measurement error. We apply this model to observational
data sets for the three Virgo giant elliptical galaxies NGC 4365,4472,
and 4649, to derive accurate new values for the GCLF peak and dispersion.
With a Virgo core distance modulus of (m M)_V_= 30.95+/0.25, we obtain
GCLF turnover luminosities for the three gEs as follows:
M^0^_V_ = 7.12+/0.36 and {sigma}_t_ = 1.52+/0.13 (NGC 4365),
M^0^_V_ = 7.03+/0.27 and {sigma}_t_ = 1.30+/0.07 (NGC 4472), and
M^0^_V_ = 7.18+/0.27 and {sigma}_t_ = 1.15+/0.07 (NGC 4649).
Accordingly, the unweighted average of these GCLF parameter estimates are
<M^0^_V_> =  7.11+/0.3 and <{sigma}_t_> = 1.32+/0.09. Comparing with
similar maximumlikelihood parameter estimates for M 31 and the Milky
Way, we obtain mean differences {DELTA}M^0^_V_ = 0.31+/0.33 mag and
{DELTA}{sigma}_t_ = 0.36+/0.13 mag, in the sense that the GCLFs in the
giant ellipticals are slightly less luminous at the turnover but with
significantly large functional dispersion.
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