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Unbarred Spiral Galaxy NGC 2535

NGC 2535-2 NGC 2535-1

Unbarred Spiral Galaxy NGC 2535

NGC 2535 is an unbarred spiral galaxy in the constellation Cancer that is interacting with NGC 2536. The two galaxies are listed together in the Atlas of Peculiar Galaxies as an example of a spiral galaxy with a high surface brightness companion.

NGC 2535 has an ocular (eye-shaped) structure indicative of a recent, close, non merging encounter. Our observations reveal widespread high velocity dispersions (30 kms-1) in the HI gas and five clouds with masses of ∼ 108 M 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 x 109 M clump of HI gas at the outer end of the tidal bridge from NGC 2535.

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