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Distances to Galactic High-Velocity Clouds: Complex C

Wakker, B. P ; York, D. G ; Howk, J. C ; Barentine, J. C ; Wilhelm, R ; Peletier, R. F ; van Woerden, H ; Beers, T. C ; Ivezić, Ž ; Richter, P ; Schwarz, U. J

The Astrophysical journal, 2007-12, Vol.670 (2), p.L113-L116 [Periódico revisado por pares]

Chicago, IL: IOP Publishing

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  • Título:
    Distances to Galactic High-Velocity Clouds: Complex C
  • Autor: Wakker, B. P ; York, D. G ; Howk, J. C ; Barentine, J. C ; Wilhelm, R ; Peletier, R. F ; van Woerden, H ; Beers, T. C ; Ivezić, Ž ; Richter, P ; Schwarz, U. J
  • Assuntos: Astronomy ; Earth, ocean, space ; Exact sciences and technology
  • É parte de: The Astrophysical journal, 2007-12, Vol.670 (2), p.L113-L116
  • Notas: ObjectType-Article-2
    SourceType-Scholarly Journals-1
    ObjectType-Feature-1
    content type line 23
  • Descrição: We report the first determination of a distance bracket for the high-velocity cloud (HVC) complex C. Combined with previous measurements showing that this cloud has a metallicity of 0.15 times solar, these results provide ample evidence that complex C traces the continuing accretion of intergalactic gas falling onto the Milky Way. Accounting for both neutral and ionized hydrogen as well as He, the distance bracket implies a mass of (3-14) x [unk] M [unk], and the complex represents a mass inflow of 0.1-0.25 M [unk] yr-1. We base our distance bracket on the detection of Ca II absorption in the spectrum of the blue horizontal branch (BHB) star SDSS J120404.78+623345.6, in combination with a significant nondetection toward the BHB star BS 16034-0114. These results set a strong distance bracket of 3.7-11.2 kpc on the distance to complex C. A more weakly supported lower limit of 6.7 kpc may be derived from the spectrum of the BHB star BS 16079-0017.
  • Editor: Chicago, IL: IOP Publishing
  • Idioma: Inglês
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