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Journal of Astrophysics and Astronomy

, Volume 26, Issue 1, pp 1–70 | Cite as

GMRTHI observations of the Eridanus group of galaxies

  • A. Omar
  • K. S. Dwarakanath
Article

Abstract

The GMRTHI 21 cm-line observations of galaxies in the Eridanus group are presented. The Eridanus group, at a distance of ≈ 23 Mpc, is a loose group of ≈200 galaxies. The group extends to more than 10 Mpc in projection. The velocity dispersion of the galaxies in the group is ≈240 km s−1. The galaxies are clustered into different sub-groups. The overall population mix of the group is 30% (E + S0) and 70% (Sp + Irr). The observations of 57 Eridanus galaxies were carried out with the GMRT for ≈ 200 h. HI emission was detected from 31 galaxies. The channel rms of ≈ 1 mJy beam−1 was achieved for most of the image-cubes made with 4 h of data. The corresponding HI column density sensitivity (3σ) is ≈ 1 × 1020 cm−2 for a velocity-width of ≈ 13.4 km s−1. The 3σ detection limit of HI mass is ≈ 1.2 X 107 Mpd for a line-width of 50 km s−1. Total HI images, HI velocity fields, global HI line profiles, HI mass surface densities, HI disk parameters and HI rotation curves are presented. The velocity fields are analysed separately for the approaching and the receding sides of the galaxies. These data will be used to study the HI and the radio continuum properties, the Tully-Fisher relations, the dark matter halos, and the kinematical and HI lopsidedness in galaxies.

Key words

Galaxies: groups, clusters individual: Eridanus radio lines:HI 21cm-line 

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References

  1. Baker, R. H. 1933,Ann. Harv. Coll. Obs.,88, 79.ADSGoogle Scholar
  2. Baker, R. H. 1936, Ann.Harv. Coll. Obs.,88, No. 6.Google Scholar
  3. Begeman, K. 1989,Astron. Astrophys.,223, 47.ADSGoogle Scholar
  4. Binggeli, B., Tammann, G. A., Sandage, A. 1987,Astron. J.,94, 251.CrossRefADSGoogle Scholar
  5. Bottinelli, L., Gouguenheim, L., Fouque, P., Paturel, G. 1990,Astron. Astrophys. Suppl.,82, 391.ADSGoogle Scholar
  6. Bravo-Alfaro, H., Cayatte, V., van Gorkom, J. H., Balkowski, C. 2000,Astron. J.,119, 580.CrossRefADSGoogle Scholar
  7. Broeils, A. H., Rhee, M.-H. 1997,Astron. Astrophys.,324, 877.ADSGoogle Scholar
  8. Cayatte, V., van Gorkom, J. H., Balkowski, C., Kotanyi, C. 1990,Astron. J.,100, 604.CrossRefADSGoogle Scholar
  9. Cowie, L. L., Songaila, A. 1977,Nature,266, 501.CrossRefADSGoogle Scholar
  10. Curtis, H. D. 1918,Publ. Lick Obs.,13, 9.Google Scholar
  11. Davies, R. D., Lewis, B. M. 1973,Mon. Not. R. Astron. Soc.,165, 231.ADSGoogle Scholar
  12. da Costa, L. N., Pellegrini, P. S., Sargent, W. L.et al. 1988,Astrophys. J.,327, 544.CrossRefADSGoogle Scholar
  13. de Vaucouleurs, G. InGalaxies and the Universe, (eds) Sandage, A., Sandage, M., Kristian, J., Univ. of Chicago, Chicago, p. 557.Google Scholar
  14. Dressler, A. 1980,Astrophys. J.,236, 351.CrossRefADSGoogle Scholar
  15. Dressler, A., Oemler, A. Jr., Couch, W. J.et al. 1997,Astrophys. J.,490, 577.CrossRefADSGoogle Scholar
  16. Fasano, G., Poggianti, B. M., Couch, W. J.et al. 2000,Astrophys. J.,542, 673.CrossRefADSGoogle Scholar
  17. Federspiel, M., Tammann, G. A., Sandage, A. 1998,Astrophys. J.,495, 115.CrossRefADSGoogle Scholar
  18. Ferguson, H. C. 1989,Astroph. Space Sci.,157, 227.CrossRefADSGoogle Scholar
  19. Giovanelli, R., Haynes, M. P. 1985,Astrophys. J.,292, 404.CrossRefADSGoogle Scholar
  20. Gooch, R., 1996 InAstronomical Data Analysis Software and Systems — V, A.S.P. Conference Series, (eds) Jacoby, G. H. & Barnes, J.,101, 80.Google Scholar
  21. Gunn, J. E., Gott, J. R. 1972,Astrophys. J.,176, 1.CrossRefADSGoogle Scholar
  22. Haynes, M. P., Giovanelli, R. 1984,Astron. J.,89, 758.CrossRefADSGoogle Scholar
  23. Haynes, M. P., Giovanelli, R. 1986,Astrophys. J.,306, 466.CrossRefADSGoogle Scholar
  24. Hubble, E., Humason, M. L. 1931,Astrophys. J.,74, 43.CrossRefADSGoogle Scholar
  25. Jensen, J. B., Tonry, J. L., Luppino, G. A. 1998,Astrophys. J.,505, 111.CrossRefADSGoogle Scholar
  26. Magri, C., Haynes, M. P., Forman, W., Jones, C., Giovanelli, R. 1988,Astrophys. J.,333, 136.CrossRefADSGoogle Scholar
  27. Moore, B., Lake, G., Katz, N. 1998,Astrophys. J.,495, 139.CrossRefADSGoogle Scholar
  28. Mould J. R., Hughes, S. M. G., Stetson, P. B.et al. 2000,Astrophys. J.,528, 655.CrossRefADSGoogle Scholar
  29. Mukai, K. 1993,Legacy 3 (HEASARC Journal), p. 21–31. (http://heasarc.gsfc.nasa.gov/docs/software/tools/pimms.html)Google Scholar
  30. Mulchaey, J. S. 2000,Ann. Rev. Astron. Astrophys.,38, 289.CrossRefADSGoogle Scholar
  31. Mushotzky, R. F., Smith, B. W. 1980, InHighlights of astronomy, IAU Proceedings,5, 735.ADSGoogle Scholar
  32. Nulsen, P. E. J. 1982,Mon. Not. R. Astron. Soc.,198, 1007.ADSGoogle Scholar
  33. Omar, A. 2004, Ph.D. Thesis, Jawaharlal Nehru University, Delhi.Google Scholar
  34. Paolillo, M., Andreon, S., Longo, G.et al. 2001,Astron. Astrophys.,367, 59.CrossRefADSGoogle Scholar
  35. Pellegrini, P. S., da Costa, L. N., Huchra, J. P., Latham, D.W., Willmer, C. N. A. 1990,Astron. J.,99, 751.CrossRefADSGoogle Scholar
  36. Poggianti, B. M., Smail, I., Dressler, A.et al. 1999,Astrophys. J.,518, 576.CrossRefADSGoogle Scholar
  37. Postman, M., Geller, M. J. 1984,Astrophys. J.,281, 95.CrossRefADSGoogle Scholar
  38. Rood, H. J., Rothman, V. C. A., Turnrose, B. E. 1970,Astrophys. J.,162, 411.CrossRefADSGoogle Scholar
  39. Rupen, M. P. 1999, InSynthesis imaging in radio astronomy, ASP Conf. Ser.,180, 229.ADSGoogle Scholar
  40. Richter, O. G., Sadler, E. M. 1985,Astron. Astrophys. Suppl.,59, 433.ADSGoogle Scholar
  41. Sakai, S., Mould, J. R., Hughes, S. M. G.et al. 2000,Astrophys. J.,529, 698.CrossRefADSGoogle Scholar
  42. Sandage, A., Tammann, G. A. 1975,Astrophys. J.,196, 313.CrossRefADSGoogle Scholar
  43. Spitzer, L. Jr. 1978, InPhysical processes in the Interstellar medium, (Wiley-interscience publication).Google Scholar
  44. Swarup, G., Ananthakrishnan, S., Kapahi, V. K.et al. 1991,Curr. Sci.,60, 95.ADSGoogle Scholar
  45. Tonry, J. L., Blakeslee, J. P., Ajhar, E. A., Dressler, A. 1997,Astrophys. J.,475, 399.CrossRefADSGoogle Scholar
  46. Tonry, J. L.et al. 2001,Astrophys. J.,546, 681.CrossRefADSGoogle Scholar
  47. Trinchieri, G., Pellegrini, S., Wolter, A., Fabbiano, G., Fiore, F. 2000,Astron. Astrophys.,364, 53.ADSGoogle Scholar
  48. Tully, R. B., Verheijen, M. A. W., Pierce, M. J., Huang, J., Wainscoat, R. J. 1996,Astron. J.,112, 2471.CrossRefADSGoogle Scholar
  49. Tully, R. B., Fouque, P. 1985,Astrophys. J. Suppl.,58, 67.CrossRefADSGoogle Scholar
  50. Verdes-Montenegro, L., Yun, M. S., Williams, B. A., Huchtmeier, W. K., Del Olmo, A., Perea, J. 2001,Astron. Astrophys.,377, 812.CrossRefADSGoogle Scholar
  51. Verheijen, M. A. W., Sancisi, R. 2001,Astron. Astrophys.,370, 765.CrossRefADSGoogle Scholar
  52. Warmels, R. H. 1988,Astron. Astrophys. Suppl.,72, 19.ADSGoogle Scholar
  53. Welch, G. A., Chincarini, G., Rood, H. J. 1975,Astron. J.,80, 77.CrossRefADSGoogle Scholar
  54. Willmer, C. N. A., Focardi, P., da Costa, L. N., Pellegrini, P. S. 1989,Astron. J.,98, 1531.CrossRefADSGoogle Scholar

Copyright information

© Indian Academy of Sciences 2005

Authors and Affiliations

  • A. Omar
    • 1
  • K. S. Dwarakanath
    • 1
  1. 1.Raman Research InstituteBangaloreIndia

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