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Distances to Galactic high-velocity clouds. Complex C | | B.P. Wakker
; D.G. York
; J.C. Howk
; J.C. Barentine
; R. Wilhelm
; R.F. Peletier
; H. van Woerden
; T.C. Beers
; Z. Ivezic
; P. Richter
; U.J. Schwarz
; | | Date: |
17 Oct 2007 | | Abstract: | 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 3-14x10^6 M_sun, and the
complex represents a mass inflow of 0.1-0.25 M_sun/yr. We base our distance
bracket on the detection of CaII absorption in the spectrum of the blue
horizontal branch star SDSS J120404.78+623345.6, in combination with a
significant non-detection 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. | | Source: | arXiv, 0710.3340 | | Services: | Forum | Review | PDF | Favorites | |
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