Ocular Galaxies: NGC 2535 and its Starburst Companion NGC 2536

E. Brinks, M. Kaufman, D.M. Elmegreen, M. Thomasson, B.G. Elmegreen, C. Struck, M. Klarić
1999 Symposium - International astronomical union  
We obtained HI, radio continuum, and12COJ= 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 HIgas and five clouds with masses of ~ 108M⊙in the tidal arms of NGC 2535. CO emission was detected at the center
more » ... 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) HIenvelope and an outer elliptically–shaped HIarc that may be a gravitational wake produced by the passage of the companion within or close to the extended HIenvelope. The starburst companion, NGC 2536, lies in a 2 × 109M⊙clump of HIgas 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).
doi:10.1017/s0074180900112781 fatcat:lherj3ytj5ej7fiedfyjr7nj5u