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IMPACT OF NEIGHBORS IN SDSS GALAXY PAIRS

  • MOON, JUN-SUNG (Department of Astronomy & Center for Galaxy Evolution Research, Yonsei University) ;
  • YOON, SUK-JIN (Department of Astronomy & Center for Galaxy Evolution Research, Yonsei University)
  • 투고 : 2014.11.30
  • 심사 : 2015.06.30
  • 발행 : 2015.09.30

초록

How galaxies are affected by their neighboring galaxies during galaxy-galaxy interactions is a long-standing question. We investigate the role of neighbors in galaxy pairs based on the SDSS data release 7 and the KIAS value-added galaxy catalog. Three groups of galaxies are identified: (a) galaxies with an early-type neighbor, (b) with a late-type neighbor, and (c) isolated ones with no neighbor. We compare their UV + optical colors and $H{\alpha}$ emission as indicators of the recent star-formation rate (SFR). Given that galaxies show systematic differences in SFR as functions of morphology, luminosity, and large-scale environments, we construct a control sample in which the galaxies have the same conditions (in terms of morphology, luminosity, and large-scale environment) except for the neighbor's properties (i.e., morphology, mass, and distance). The results are as follows. (1) Galaxies with a late-type companion demonstrate more enhanced SFR than those with an early-type companion. (2) Galaxies with an early-type neighbor show NUV- and u-band derived SFRs that are even lower than that of isolated galaxies, while they have similar or slightly higher $H{\alpha}$-based SFR compared to isolated ones.

키워드

참고문헌

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피인용 문헌

  1. MAJOR-MERGER GALAXY PAIRS ATZ= 0: DUST PROPERTIES AND COMPANION MORPHOLOGY vol.829, pp.2, 2016, https://doi.org/10.3847/0004-637X/829/2/78