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Ocular Galaxies: NGC 2535 and its Starburst Companion NGC 2536

Published online by Cambridge University Press:  25 May 2016

E. Brinks
Affiliation:
Universidad de Guanajuato, Guanajuato, Mexico
M. Kaufman
Affiliation:
Ohio State University, Columbus, USA
D.M. Elmegreen
Affiliation:
Vassar College, Poughkeepsie, USA
M. Thomasson
Affiliation:
Onsala Space Observatory, Onsala, Sweden
B.G. Elmegreen
Affiliation:
IBM T. J. Watson Research Center, Yorktown Heights, USA
C. Struck
Affiliation:
Iowa State University, Ames, USA
M. Klarić
Affiliation:
Midlands Technical College, Columbia, USA

Extract

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We obtained HI, radio continuum, and 12CO J = 1 → 0 observations at resolutions of 12″ to 33″ (= 2.9 - 8 kpc), and B, I, J, and K–band images, of the galaxy NGC 2535 and its small starburst companion NGC 2536. NGC 2535 has an ocular (eye-shaped) structure indicative of a recent, close, nonmerging encounter. Our observations reveal widespread high velocity dispersions (30 km s−1) in the HI gas and five clouds with masses of ~ 108M in the tidal arms of NGC 2535. CO emission was detected at the center and on the tidal tail, but close to the center, of NGC 2535; no CO emission was detected from the companion. NGC 2535 has an intrinsically oval shape to the disk, an extended (R = 48 kpc) HI envelope and an outer elliptically–shaped HI arc that may be a gravitational wake produced by the passage of the companion within or close to the extended HI envelope. The starburst companion, NGC 2536, lies in a 2 × 109M clump of HI gas at the outer end of the tidal bridge from NGC 2535. A full account our results appears in Kaufman et al. (1997, AJ, 114, 2323).

Type
Starbursts
Copyright
Copyright © Kluwer 1999