Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...371l..19b&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 371, April 10, 1991, p. L19-L22.
Astronomy and Astrophysics
Astronomy
39
Galactic Nuclei, Galactic Rotation, Galactic Structure, Infrared Sources (Astronomy), Interacting Galaxies, Astronomical Photometry, Astronomical Spectroscopy, Fabry-Perot Interferometers, Infrared Astronomy
Scientific paper
The first complete kinematic maps for the superluminous IR galaxy NGC 6240 are reported. The data reveal two dynamical disks that exhibit radically different rotation and are closely spaced in velocity and position. One disk is roughly aligned with the major axis of the near-IR continuum and exhibits flat rotation out to about 20 arsec in radius, centered on the doubled nucleus seen at optical, near-IR, and radio wavelengths. The rotation turns over at r(t1) roughly 7.2 arcsec with a peak-to-peak velocity amplitude of roughly 280/sin i1 km/s, where i1 is the disk inclination. The rotation curve of the second disk comprises an unresolved or marginally resolved central velocity gradient with a peak-to-peak amplitude of roughly 800/sin i2 km/s within r(t2) of 2.5 arcsec, and a faster than Keplerian dropoff outside r(t2). The peak rotation implies a compact mass M2 greater than 4.5 x 10 to the 10th solar mass/sin-squared i2 within a radius of 1.2 kpc.
Bland-Hawthorn Jonathan
Tully Brent R.
Wilson Andrew S.
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