Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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A Study of Outer-ring Galaxies within z<0.05

적색편이 z<0.05의 외부고리 은하에 대한 연구

  • Chang, Hunhwi (Department of Earth Science Education, Korea National University of Education) ;
  • Sohn, Jungjoo (Department of Earth Science Education, Korea National University of Education) ;
  • Ahn, Hongbae (Department of Science Education, Pusan National University)
  • 장훈휘 (한국교원대학교 지구과학교육과) ;
  • 손정주 (한국교원대학교 지구과학교육과) ;
  • 안홍배 (부산대학교 과학교육학부)
  • Received : 2020.02.17
  • Accepted : 2020.06.02
  • Published : 2020.06.30
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Abstract

This study classified outer-ring galaxies using 25,308 galaxies within z=0.05 from the SDSS DR7, which are larger than Rpet>6 arcsec and whose minor-to-major axis ratio (b/a)<0.6. We selected 531 galaxies that have ring-like structures by visual inspection of the color images of 25,308 galaxies; these galaxies with ring-like structures served as a primary sample from which we selected 90 outer-ring galaxies. The final sample of 69 outer-ring galaxies was selected by examining the photometric properties of the candidate galaxies. Their properties were determined by conducting surface photometry on their u, g, r, i, and z images. The frequency of the outer-ring galaxies was found to be 0.3% of the local galaxies. We examined the environment of the outer-ring galaxies using two measures of environment, namely, the projected distance to the nearest-neighbor galaxy and the local background density. We did not observe any notable difference between outer-ring and other galactic environments.

이 연구는 SDSS DR7의 적색이동(z)<0.05이고, 동시에 Rpet>6 arcsec, 단축과 장축의 비(b/a)>0.6인 외부은하 25,308개를 분류하고, 색 영상을 육안으로 조사하여 고리 모양의 구조를 가진 531개 은하를 선별했다. 이 은하들이 일차적 표본으로 사용되었고, 이 중 90개의 외부고리 은하 후보를 선택했다. 후보 은하의 u, g, r, i, z 영상에 대한 표면 측광으로부터 도출한 특성을 조사하여 최종으로 69개의 외부고리 은하를 결정했다. 외부고리 은하는 국부은하의 0.3%를 차지하는 것으로 나타났으며, 두 개의 환경 인자, 즉, 가장 가까운 은하까지의 투영 거리와 국부 배경 은하 밀도를 이용하여, 외부고리 은하의 환경 특성을 조사했다. 외부고리 은하의 환경이 다른 은하의 경우와 비교하여 눈에 띄는 차이의 결과는 보이지 않았다.

Keywords

References

  1. Abazajian, K. et al. 2009, The Seventh Data Release of the Sloan Digital Sky Survey. The Astrophysical Journal Supplement Series, 182, 543-558 https://doi.org/10.1088/0067-0049/182/2/543
  2. Ann, H. B. 2014, Environment Dependence of Disk Morphology of Spiral Galaxies. Journal of the Korean astronomical society, 47, 1-13 https://doi.org/10.5303/JKAS.2014.47.1.1
  3. Ann, H. B. 2017, Environment Dependence of Luminosity- Size Relation of Local Galaxies. Journal of the Korean earth science society, 38, 333-344 https://doi.org/10.5467/JKESS.2017.38.5.333
  4. Athanassoula et al. 1982, On the Sizes of Ring and Lense in Disk Galaxies. Astronomy & Astrophysics, 107, 101-106
  5. Buta, R. 1995, The Catalog of Southern Ringed Galaxies. The Astrophysical Journal Supplement Series, 96, 39-116 https://doi.org/10.1086/192113
  6. Comeron, S. et al. 2014, ARRAKIS: atlas of resonance rings as known in the S4G. Astronomy & Astrophysics, 562, 121-160
  7. Dehnen, W. 2000, The Effect of the Outer Lindblad Resonance of the Galactic Bar on the Local Stellar Velocity Distribution. The Astronomical Journal, 119, 800-813 https://doi.org/10.1086/301226
  8. Elmegreen, D. M. et al. 1992, The influence of environment on outer rings and pseudo-rings in galaxies. Astronomy & Astrophysics, 257, 17-23
  9. Kostiuk, I. P., Sil'chenko, O. K. 2016, Outer rings in earlytype disk galaxies: star formation rate. Baltic Astronomy, 25, 331-337
  10. Muldrew, S. I., et al. 2012, Measures of Galaxy Environment-I. What is 'Environment?'. Monthly Notices of the Royal Astronomical Society, 419, 2670-2682 https://doi.org/10.1111/j.1365-2966.2011.19922.x
  11. Park, C., Gott, J. R. III, and Choi, Y.-Y. 2008, Transformation of Morphology and Luminosity Classes of the SDSS Galaxies. The Astrophysical Journal Supplement Series, 674, 784-796
  12. Schwarz, M. P. 1984, How bar strength and pattern speed affect galactic spiral structure. Monthly Notices of the Royal Astronomical Society. 209, 93-109 https://doi.org/10.1093/mnras/209.1.93
  13. Sheth, K. et al. 2010, The Spitzer Survey of Stellar Structure in Galaxies (S4G). Publications of the Astronomical Society of the Pacific, 122, 1397-1410 https://doi.org/10.1086/657638
  14. Sil'chenko, O., Kostiuk, I.., Burenkov, A.., Parul, H. 2018, Star formation in outer rings of S0 galaxies. I. NGC 6534 and MCG 11-22-015. Astronomy & Astrophysics, 620, 7-11
  15. Stoughton, C. et al. 2002, Sloan Digital Sky Survey: Early Data Release. The Astronomical Journal, 123, 485-548 https://doi.org/10.1086/324741
  16. de Vaucouleurs G., 1959, Classification and Morphology of External Galaxies. Handbuch der Physik, 53, 275-310
  17. de Vaucouleurs, G. and Buta, R. 1980, Inner ring structures in galaxies as distance indicators. I-Dimensionless systematics of inner rings. The Astrophysical Journal Supplement Series. 44, 451-479 https://doi.org/10.1086/190700
  18. Wilman, D. and Erwin, P. 2012, The Relation between Galaxy Morphology and Environment in the Local Universe: An RC3-SDSS Picture. The Astrophysical Journal, 746, 160-181 https://doi.org/10.1088/0004-637X/746/2/160