Near-infrared spectral gradients in ellipticals and bulges, and the nature of the NA feature near 8200 A

Details Near-infrared spectral gradients in ellipticals and bulges, and the nature of the NA feature near 8200 A Near-infrared spectral gradients in ellipticals and bulges, and the nature of the NA feature near 8200 A

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103..711d&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 103, March 1992, p. 711-727. Research supported by NSERC.

Astronomy and Astrophysics

Astronomy

30

Elliptical Galaxies, Emission Spectra, Galactic Nuclei, Metallicity, Near Infrared Radiation, Sodium, Color-Magnitude Diagram, Early Stars, Infrared Spectra, Stellar Spectrophotometry

Scientific paper

Attention is given to spatially resolved spectrophotometric data in the 8000-10,000-A spectral interval presented for a sample of 10 bulges and ellipticals. In all the galaxies observed the IR Na feature near 8200 A extends further to the red than expected from the wavelength of the Na I doublet lines alone, confirming the presence of additional spectral components. A study of the radial dependence of the Faber-French Na I spectral index and of the IR Ca II triplet shows that the former decreases with radius while the latter either decreases or remains constant, but never increases. Measurements at the center of galaxies indicate that the strength of the Na indices correlates both with the strength of the Mg2 metallicity indicator and with the absolute magnitude of the galaxy. It is concluded that the evidence claimed for dwarf enrichment of the central regions of early-type galaxies on the basis of the Na feature, as measured by spectral indices, was very likely the result of metallicity effects.

Affiliated with

Also associated with

No associations

Rating

Near-infrared spectral gradients in ellipticals and bulges, and the nature of the NA feature near 8200 A does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Near-infrared spectral gradients in ellipticals and bulges, and the nature of the NA feature near 8200 A, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Near-infrared spectral gradients in ellipticals and bulges, and the nature of the NA feature near 8200 A will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1214761