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An anomalous velocity neutral hydrogen structure near the galactic center

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Abstract

An extensive concentration of neutral hydrogen has been observed in the fourth galactic quadrant, with a mean radial velocity of +44 km s−1 referred to the local standard of rest. At a distance ofR kpc from the Sun this structure would contain 2.5×104 R 2 solar masses of neutral hydrogen.

Five possible interpretations of this extensive concentration are considered: (1) part of the shell of a nearby explosive event; (2) a distant spiral arm of the Galaxy; (3) an extragalactic object; (4) material falling into our Galaxy; (5) gas expelled from the galactic center. Arguments are offered against the first three possibilities.

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Author notes

  1. I. F. Mirabel (Member of the Carrera del Investigador Cientifico del Consejo Nacional de Investigaciones Cientificas y Técnicas)

    Present address: , Argentina

Authors and Affiliations

  1. Observatorio Astronómico de la Universidad Nacional de La Plata, Argentina

    I. F. Mirabel (Member of the Carrera del Investigador Cientifico del Consejo Nacional de Investigaciones Cientificas y Técnicas)

  2. Instituto Argentino de Radioastronomía, Argentina

    I. F. Mirabel (Member of the Carrera del Investigador Cientifico del Consejo Nacional de Investigaciones Cientificas y Técnicas) & K. C. Turner

  3. Dept. of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, D. C., USA

    K. C. Turner

Authors
  1. I. F. Mirabel
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  2. K. C. Turner
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This Institution functions under an agreement between the Consejo Nacional de Investigaciones Cientificas y Técnicas, the Comision de Investigaciones Cientificas de la Provincia de Buenos Aires, the Universidad Nacional de la Plata and the Universidad Nacional de Buenos Aires, and with the support of the Carnegie Institution of Washington.

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Mirabel, I.F., Turner, K.C. An anomalous velocity neutral hydrogen structure near the galactic center. Astrophys Space Sci 38, 381–394 (1975). https://doi.org/10.1007/BF00647139

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  • DOI: https://doi.org/10.1007/BF00647139

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