천문학논총 (Publications of The Korean Astronomical Society)

  • 제30권2호
  • /
  • Pages.517-519
  • /
  • 2015
  • /
  • 1225-1534(pISSN)
  • /
  • 2287-6936(eISSN)
한국천문학회 (The Korean Astronomical Society)
권호 표지
DOI QR코드

DOI QR Code

A STUDY OF DWARF GALAXIES EMBEDDED IN A LARGE-SCALE Hɪ RING IN THE LEO I GROUP

  • 투고 : 2014.11.30
  • 심사 : 2015.06.30
  • 발행 : 2015.09.30
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

A large-scale neutral hydrogen ($H\small{I}$) ring serendipitously found in the Leo I galaxy group is 200 kpc in diameter with $M_{H\small{I}}{\sim}1.67{\times}10^9M_{\odot}$, unique in size in the Local Universe. It is still under debate where this $H\small{I}$ ring originated - whether it has formed out of the gas remaining after the formation of a galaxy group (primordial origin) or been stripped during galaxy-galaxy interactions (tidal origin). We are investigating the optical and $H\small{I}$ gas properties of the dwarf galaxies located within the gas ring in order to probe its formation mechanism. In this work, we present the photometric properties of the dwarfs inside the ring using the CFHT MegaCam $u^{\ast}$, $g^{\prime}$, $r^{\prime}$ and $i^{\prime}$-band data. We discuss the origin of the gas ring based on the stellar age and metal abundance of dwarf galaxies contained within it.

키워드

참고문헌

  1. Bekki, K., Koribalski,B. S., Ryder, S. D., & Couch, W. J., 2005, Massive H I Clouds with No Optical Conterparts as High-density Regions of Intragroup H I Rings and Arcs, MNRAS, 357, L21 https://doi.org/10.1111/j.1745-3933.2005.08625.x
  2. Bot, C., Helou, G., Latter,W. B., Puget, J., Schneider, S., & Terzian, Y., 2009, A Search for Dust Emission in the Leo Intergalactic Cloud, AJ, 138, 452 https://doi.org/10.1088/0004-6256/138/2/452
  3. Bressan, A., Marigo, P., & Girardi, L., et al., 2012, PAR-SEC: Stellar Tracks and Isochrones with the PAdova and TRieste Stellar Evolution Code, MNRAS, 427, 127 https://doi.org/10.1111/j.1365-2966.2012.21948.x
  4. Castro-Rodriguez, N., Aguerri, J. A. L., & Arnaboldi, M., et al., 2003, Narrow Band Survey for Intragroup light in the Leo H I Cloud, A&A, 405, 803 https://doi.org/10.1051/0004-6361:20030588
  5. Michel-Dansac L., Duc, P.-A., & Bournaud, F., et al., 2010, A Collisional Origin for the Leo Ring, ApJ, 717, L143 https://doi.org/10.1088/2041-8205/717/2/L143
  6. Pedersen, K., 2000, Detection of Hot Plasma Around M96 in the Leo-I Group, ASPC, 209, 202
  7. Pierce, M. J., & Tully, R. B., 1985, The Extragalactic H I Cloud in Leo, AJ, 90, 450 https://doi.org/10.1086/113750
  8. Schneider, S. E., Skrutskie, M. F., & Hacking P. B., et al., 1989, Multifrequency Survey of the Intergalactic Cloud in the M96 Group, AJ, 97, 666 https://doi.org/10.1086/115012
  9. Smith, J. A., Tucker, D. L., & Kent, S., et al., 2002, The u'g'r'i'z' Standard-star System, AJ, 123, 2121 https://doi.org/10.1086/339311
  10. Stierwalt, S., 2009, The Arecibo Legacy Fast Alfa Survey. IX. The Leo Region H I Catalog, Group Membership and the H I Mass Functjion for the Leo I group, AJ, 138, 338 https://doi.org/10.1088/0004-6256/138/2/338
  11. Thilker, D., Donovan, J., & Schiminovich, D., et al., 2009, Massive Star Formation within the Leo Primordial Ring, Nature, 457, 990 https://doi.org/10.1038/nature07780