Interstellar NA I and CA II absorption in the spectrum of the recent supernova in NGC 4321

Details Interstellar NA I and CA II absorption in the spectrum of the recent supernova in NGC 4321 Interstellar NA I and CA II absorption in the spectrum of the recent supernova in NGC 4321

Feb 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.190p..51p&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 190, Feb. 1980, p. 51P-57P.

Astronomy and Astrophysics

Astronomy

18

Astronomical Spectroscopy, Calcium, Interstellar Matter, Sodium Vapor, Supernovae, Absorption Spectra, Background Radiation, Galactic Radiation, Gas Density, Line Spectra

Scientific paper

Using the supernova as a background continuum source, we have observed interstellar Na I and Ca II absorption at the redshift of the galaxy NGC 4321. Weak galactic Ca II K lines are also detected. The column densities for gas in NGC 432l are N(Na I) = 4.4+4.3-1.0 × 1012 cm-3 and N(Ca II) = 7.4+9.6-2.0 × 1012 cm-2, and the velocity width is b = l5+11-6 (1 σ errors). The resulting Ca u/Na I ratio (˜1.7) suggests that the bulk of the absorbing material occurs in the plane rather than in the halo of NGC 4321. The sodium column density predicts that E(B-V) = 0.13+0.06-0.02 for the intervening material.

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