NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-20 T23:07:26 PDT
Help | Comment | NED Home

For refcode 1990AJ.....99..540C:
Retrieve 6 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
1990AJ.....99..540C SPECTRAL SYNTHESIS OF METALLICITY GRADIENTS IN BRIGHT EARLY-TYPE GALAXIES JEAN COUTURE AND EDUARDO HARDY Departement de Physique and Observatoire du Mont Megantic, University Laval, Sainte-Foy, Quebec G1K 7P4, Canada Received 1 September 1989;revised 17 October 1989 ABSTRACT The main question posed in this investigation is whether spectral synthesis methods confirm the metallicity gradient suggested by the observed Mg_2_ gradients. To this end we apply the method of optimized spectral population synthesis to spatially resolved spectroscopic data for a sample of six bright early-type galaxies. The data were obtained at Mont Megantic with a panoramic photon-counting system (LIPS) and cover the 4800-5500 A spectral interval and a spatial interval of more than one effective radius. We find an overall trend of decreasing metallicity with radial distance which can be expressed as {DELTA} [Fe/H]/{DELTA}(r/r_e_)^1/4^ = -0.76 +/- 0.29 (s.e.) for the mean of our sample. The statistical significance of this mean metallicity gradient is lower than that of the mean Mg_2_, gradient obtained by Couture and Hardy (1988), but consistent with the adopted [Fe/H] vs Mg_2_ calibration employed there. Our results lend confidence to the conclusion that Mg_2_ gradients are controlled mainly by metallicity. The requirements, limitations, and possible improvements of the method employed here are discussed.
Retrieve 6 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home