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A New HI Ring: LGG 138

Published online by Cambridge University Press:  05 March 2013

David G. Barnes
David G. Barnes*
Affiliation:
Australia Telescope National Facility, CSIRO, PO Box 76, Epping, NSW 2122, Australia; [email protected]
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Abstract

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A complete ring of neutral hydrogen gas (HI) in the LGG 138 group of galaxies has been found. The HI mass of the ring is greater than 109, and the gas appears to be rotating with a projected circular speed of ∼200 km s−1. Two bright galaxies are enclosed by the ring, both having radial velocities consistent with membership of the group. Faint stellar emission extends to the radial distance of the HI ring, where a small but distinct colour discontinuity of between 0·05 and 0·20 magnitudes is detected. Three simple models for the formation of the system are briefly described, the most likely appearing to be a past gas-sweeping collision between one of the two bright galaxies and an outside intruder, with the colour break being partly due to an expanding density wave that is triggering star formation, and partly to a different stellar population that has been collected from the outskirts of the intruder.

Keywords

galaxies: kinematics and dynamicsgalaxies: interactionsgalaxies: clusters: individual (LGG 138)
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 16 , Issue 1 , 1999 , pp. 77 - 83
Copyright
Copyright © Astronomical Society of Australia 1999

References

Barnes, D. G. 1998, PhD Thesis, Univ. of Melbourne Google Scholar
Bertola, F., Buson, L. M., & Zeilinger, W. W. 1992, ApJ, 401, L79 Google Scholar
Bottinelli, L., Durand, N., Fouque, P., Garnier, R., Gouguen-heim, L., Paturel, G., & Teerikorpi, P. 1992, A&AS, 93, 173 Google Scholar
Briggs, F. H. 1982, ApJ, 259, 544 Google Scholar
Ciri, R., Bettoni, D., & Galletta, G. 1995, Nature, 375, 661 Google Scholar
Corwin, H. G., de Vaucouleurs, A., & de Vaucouleurs, G. 1985, Southern Galaxy Catalogue, Univ. Texas Monographs in AstronomyGoogle Scholar
Fouqué, P., Gourgoulhon, E., Chamaraux, P., & Paturel, G. 1992, A&AS, 93, 211 Google Scholar
Franx, M., van Gorkom, J. H., & de Zeeuw, T. 1994, ApJ, 436, 642 CrossRefGoogle Scholar
Garcia, A. M. 1993, A&AS, 100, 47 Google Scholar
Garcia, A. M. 1995, A&A, 297, 56 Google Scholar
Hickson, P. 1982, ApJ, 255, 382 Google Scholar
Higdon, J. L. 1996, ApJ, 467, 241 Google Scholar
Kamphuis, J., & Briggs, F. 1992, A&A, 253, 335 Google Scholar
Koribalski, B. 1996 in Minnesota Lectures on Extragalactic HI, ed. Skillman, E. (San Francisco: PASP), p. 238 Google Scholar
Kuijken, K., Fisher, D., & Merrifield, M. R. 1996, MNRAS, 283, 543 Google Scholar
Lauberts, A., & Valentijn, E. 1989, The Surface Photometry Catalogue of the ESO–Uppsala Galaxies (Garching: European Southern Observatory)Google Scholar
Malin, D., & Hadley, B. 1997, PASA, 14, 52 Google Scholar
Moore, B., Katz, N., Lake, G., Dressler, A., & Oemler, A. Jr 1996, Nature, 379, 613 CrossRefGoogle Scholar
Nolthenius, R. 1993, ApJS, 85, 1 Google Scholar
Roberts, M. S., & Haynes, M. P. 1994, ARA&A, 32, 115 Google Scholar
Rose, J. A. 1977, ApJ, 211, 311 Google Scholar
Schneider, S. E. 1985, ApJ, 288, L33 CrossRefGoogle Scholar
Schneider, S. E. 1989, ApJ, 343, 94 Google Scholar
Schneider, S. E., Helou, G., Salpeter, E. E., & Terzian, Y. 1983, ApJ, 273, L1 Google Scholar
Schweizer, F., van Gorkom, J. H., & Seitzer, P. 1989, ApJ, 338, 770 Google Scholar
Shostak, G. S., Sullivan, W. T., & Allen, R. J. 1984, A&A, 139, 15 Google Scholar
Shostak, G. S., & van der Kruit, P. C. 1984, A&A, 132, 20 Google Scholar
Stanford, S. A. 1991, ApJ, 381, 409 Google Scholar
Stanford, S. A., & Balcells, M. 1990, ApJ, 355, 59 Google Scholar
van Woerden, H., van Driel, W., & Schwarz, U. J. 1983, in Internal Kinematics and Dynamics of Galaxies, ed. Athanassoula, E., IAU Symp., 100, 99 Google Scholar
Williams, B. A., & van Gorkom, J. H. 1988, AJ, 95, 352 Google Scholar