For refcode 1997A&A...321..343A: Retrieve 18 NED objects in this reference. Please click here for ADS abstract
NED Abstract
Copyright by European Southern Observatory (ESO).
Reproduced by permission
1997A&A...321..343A
M/L_B_ and [Fe/H] of elliptical galaxies and the initial mass function.
Angeletti L., Giannone P.
Abstract. The observed trend of masstolight ratio M/L_B_ versus
elliptical galaxy mass M has been interpreted in various ways by
different authors in recent years. We explore in greater detail than
previously done the hypothesis that the mentioned trend can be ascribed
to a systematic change of the initial mass function (IMF) with M. We use
a threesegment powerlaw IMF with mass exponents x_1_, x_2_, and x_3_
for stellar masses m (in M_{sun}_) in the ranges 0.1<m<0.3, 0.3<m<2, and
2<m<100, respectively. The exponent x_1_ is considered as a free
parameter in the range 0/3.5, while x_2_ and x_3_ are determined using
relations M/L_B_ versus M and [Fe/H] versus M as constraints. We find
that x_2_+3.4x_3_=~0.72logM+const., irrespectively of whether the bottom
IMF exponent x_1_ varies from a flat to a very steep behaviour. We single
out a number of realistic solutions; for all of them dx_3_/dlogM=0.16/
0.35. On the other hand, solutions with x_2_=const., x_3_=const., and
x_1_ variable with M are to be excluded, being at variance with the
observed [Fe/H]M relationship. We confirm that a variable singleslope
IMF is not a very appealing solution since it requires a minimum stellar
mass m_l_>0.24.
Key words: galaxies: elliptical and lenticular  elliptical galaxies:
fundamental plane and metallicity
Retrieve 18 NED objects in this reference. Please click here for ADS abstract
