Velocity-resolved infrared recombination-line spectroscopy of NGC 253

Details Velocity-resolved infrared recombination-line spectroscopy of NGC 253 Velocity-resolved infrared recombination-line spectroscopy of NGC 253

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.274l..77p&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 274, Issue 4, pp. L77-L80.

Astronomy and Astrophysics

Astronomy

10

Dust, Extinction, Galaxies: Individual: Ngc 253, Galaxies: Kinematics And Dynamics, Galaxies: Starburst, Infrared: Galaxies

Scientific paper

Observations at high spectral resolution of the Brgamma hydrogen recombination line are presented for the central 25 arcsec of the starburst galaxy NGC 253. The rotation curve derived from these data shows solid body rotation consistent with recent interferometric CO measurements but not with rotation curves derived from optical emission lines. This discrepancy is most likely due to heavy dust extinction along the line of sight causing the optical lines to underestimate the radial velocity. This dust must be located foreground to the region undergoing solid body rotation.

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