Distorted H I gas in the widely separated luminous infrared galaxy ARP 256

Jacqueline Chen, K. Y. Lo, Robert A. Gruendl, Miao Ling Peng, Yu Gao

Research output: Contribution to journalArticlepeer-review


We present new interferometric H I and CO (J = 1→0) observations of the luminous infrared source, Arp 256. Arp 256 consists of two spiral galaxies in an early stage of merging, with a projected nuclear separation of 29 kpc (54″) and an infrared luminosity of 2.0 × 1011 L . Despite the large separation of the galaxies' nuclei and mildly disrupted stellar components, the H I disks are found to be strongly disrupted, and the southern galaxy in Arp 256 shows an elevated star formation efficiency, which is consistent with a nuclear starburst. Both of these results run contrary to expectations, posing interesting questions about the physical mechanisms involved in stimulating star formation during an interaction.

Original languageEnglish (US)
Pages (from-to)720-728
Number of pages9
JournalAstronomical Journal
Issue number2 1754
StatePublished - Feb 2002


  • Galaxies: individual (Arp 256)
  • Galaxies: interactions
  • Galaxies: kinematics and dynamics
  • Galaxies: starburst

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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