Imaging and two-dimensional spectra of the IR-bright galaxy NGC 2146 - A recent low-energy merger?

Details Imaging and two-dimensional spectra of the IR-bright galaxy NGC 2146 - A recent low-energy merger? Imaging and two-dimensional spectra of the IR-bright galaxy NGC 2146 - A recent low-energy merger?

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100...60h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 100, July 1990, p. 60-69.

Astronomy and Astrophysics

Astronomy

28

Astronomical Spectroscopy, Galactic Structure, H Alpha Line, Infrared Astronomy, Infrared Imagery, Infrared Spectroscopy, Interstellar Extinction, Radial Velocity, Velocity Distribution

Scientific paper

New data are presented on the IR-luminous galaxy NGC 2146 from several sources: direct imaging in B, R, and H-alpha; IR imaging in the J, H, and K bands; long-slit spectroscopy at optical and IR wavelengths; and scanning etalon observations in H-alpha. The results allow measurement of the interstellar extinction in the dust lane, and estimation of the true luminosity of the galaxy and nuclear regions. The spectra indicate that there is no active nucleus, and measure the changing ratio of forbidden to permitted lines across the galaxy. IR images and colors indicate the existence of a significant population of hot young stars in the central regions of the system. The H-alpha velocity maps show the full radial-velocity pattern, and suggest that the system consists of a disturbed disk and a merging or interacting arm which connects to the inner dust and radio structures. Outer H-alpha and H I structures appear to be the earlier remnants of this spiraling merger.

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