Magnesium gradients in elliptical galaxies. III - Results and interpretation

Details Magnesium gradients in elliptical galaxies. III - Results and interpretation Magnesium gradients in elliptical galaxies. III - Results and interpretation

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...347..214t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 347, Dec. 1, 1989, p. 214-230. Research supported by Lowell Observatory.

Astronomy and Astrophysics

Astrophysics

35

Abundance, Elliptical Galaxies, Galactic Evolution, Magnesium, Metallicity, Astronomical Photometry, Brightness Distribution, Charge Coupled Devices, Globular Clusters, Luminosity

Scientific paper

Magnesium-index data out to faint levels in the E4 Coma Cluster galaxy NGC 4839 are reported, and the reduction procedure devised to deal with its elongated shape is discussed. The results are compared with earlier ones reported for the E1 cD galaxy located near the center of the Coma Cluster and with those reported for the much-studied E0 galaxy NGC 4841 about 18 arcmin north of the cluster center. In dimensionless form, the magnesium-index gradient in NGC 4839 is found to be -0.055 + or - 0.005 in the surface brightness range 18.4-20.0 mag/sq arcsec and -0.020 + or - 0.003 in the range 20.2-23.8 mag/sq arcsec. These two values bracket the gradients found in NGC 4874 and NGC 4881. Unless the relationship of the Mg2 index to the metallicity (Fe/H) differs greatly from that given by Terlevich et al. (1981), the metallicity near the center of NGC 4839 is greater than the solar value, and drops to only a little less than the solar value in the halo.

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