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Massive star formation within the Leo ‘primordial’ ring

Author

Listed:
  • David A. Thilker

    (Center for Astrophysical Sciences, The Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, USA)

  • Jennifer Donovan

    (Columbia University, Pupin Physics Laboratories, Mail Code 5246, 550 West 120th Street, New York, New York 10027, USA)

  • David Schiminovich

    (Columbia University, Pupin Physics Laboratories, Mail Code 5246, 550 West 120th Street, New York, New York 10027, USA)

  • Luciana Bianchi

    (Center for Astrophysical Sciences, The Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, USA)

  • Samuel Boissier

    (Laboratoire d'Astrophysique de Marseille, BP 8, Traverse du Siphon, 13376 Marseille Cedex 12, France)

  • Armando Gil de Paz

    (Facultad de Ciencias Físicas, Universidad Complutense de Madrid)

  • Barry F. Madore

    (Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, California 91101, USA)

  • D. Christopher Martin

    (California Institute of Technology, MC 405-47, 1200 East California Boulevard, Pasadena, California 91125, USA)

  • Mark Seibert

    (Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, California 91101, USA)

Abstract

Stars of the Leo ring A massive ring of neutral hydrogen (H i) was detected during radio observations in the 1980s, orbiting the M105 and NGC 3384 galaxies in the constellation Leo. Called the Leo ring, it remains a mysterious structure, thought to be a remnant primordial cloud left over from when the Leo I group galaxies formed. Until now the Leo ring has been detected only in the radio region of the spectrum (H i emission), suggesting an absence of stars. Now observations from the GALEX (Galaxy Evolution Explorer) orbiting space telescope have detected ultraviolet light originating from parts of the ring, indicating recent massive star formation in substructures. If such structures were common in the early Universe, they may have produced a large, as yet undetected population of faint, metal-poor, halo-lacking dwarf galaxies.

Suggested Citation

  • David A. Thilker & Jennifer Donovan & David Schiminovich & Luciana Bianchi & Samuel Boissier & Armando Gil de Paz & Barry F. Madore & D. Christopher Martin & Mark Seibert, 2009. "Massive star formation within the Leo ‘primordial’ ring," Nature, Nature, vol. 457(7232), pages 990-993, February.
    • Handle: RePEc:nat:nature:v:457:y:2009:i:7232:d:10.1038_nature07780
    DOI: 10.1038/nature07780
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