The inner disk of NGC 253

Details The inner disk of NGC 253 The inner disk of NGC 253

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...289..129s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 289, Feb. 1, 1985, p. 129-140.

Astronomy and Astrophysics

Astronomy

138

Galactic Nuclei, Galactic Structure, Infrared Astronomy, Interstellar Matter, Mass Distribution, Star Distribution, Astronomical Photometry, Carbon Monoxide, Luminosity, Near Infrared Radiation, Stellar Evolution

Scientific paper

The stellar and interstellar matter distributions in the luminous Sc galaxy NGC 253 are analyzed using maps of the near-infrared continuum (λ = 1 - 2 μm) and the millimeter CO emission line. The stellar disk traced out in the near-infrared exhibits two components: a nuclear peak of diameter ≡20arcsec(≡300 pc) and an extended, inner disk of diameter ≡360arcsec(≡6 kpc). The 2 μm brightness distribution mapped over the full extent of the inner disk is dominated by a barlike feature at position angle 17° east of the major axis extending to ±120arcsec on opposite sides of the nucleus. The derived abundance of molecular gas in the inner disk exceeds that of H I by a factor of 10 and exhibits a much steeper falloff with radius. The total mass of H2 inside R = 4 kpc is ≡2×109M_sun;, which is ≡7% of the dynamical mass at the same radius.

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