期刊
ASTROPHYSICAL JOURNAL
卷 670, 期 2, 页码 L113-L116出版社
IOP PUBLISHING LTD
DOI: 10.1086/524222
关键词
galaxy : evolution; galaxy : general; galaxy : halo; galaxy : structure; ISM : clouds; stars : distances
资金
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [0907877] Funding Source: National Science Foundation
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 10(6) M-circle dot, and the complex represents a mass inflow of 0.1-0.25 M-circle dot 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.
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