2008ApJ...684..364T

Query : 2008ApJ...684..364T

2008ApJ...684..364T - Astrophys. J., 684, 364-372 (2008/September-1)

An accurate distance to high-velocity cloud Complex C.

THOM C., PEEK J.E.G., PUTMAN M.E., HEILES C., PEEK K.M.G. and WILHELM R.

Abstract (from CDS):

We report an accurate distance of d=10±2.5 kpc to the high-velocity cloud Complex C. Using high signal-to-noise ratio Keck HIRES spectra of two horizontal-branch stars, we have detected Ca II K absorption lines from the cloud. Significant nondetections toward a further three stars yield robust lower distance limits. The resulting H I mass of Complex C is M_HI=4.9+2.9-2.2_x106 M☉; a total mass of Mtot=8.2+4.6–2.6x106 M☉ is implied, after corrections for helium and ionization. At 10 kpc, Complex C has physical dimensions 3x15 kpc, and if it is as thick as it is wide, then the average density is log<n≥~-2.5. We estimate the contribution of Complex C to the mass influx may be as high as ∼0.14 M☉/yr.

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Journal keyword(s): Galaxy: Evolution - Galaxy: Halo - ISM: Clouds - ISM: individual (Complex C)

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Magellanic Stream HVC 00 32 -30.0           ~ 1079 1
2 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
3 NAME Pisces I G 01 03 55.0 +21 53 06   16.18 14.3     ~ 404 0
4 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
5 HVC 130+01-161 HVC 01 55.9 +60 38           ~ 53 0
6 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1741 2
7 NAME Leo T G 09 34 53.4 +17 03 05     15.1     ~ 434 0
8 2MASS J13365484+6222417 HB* 13 36 54.8389560384 +62 22 41.610817272           A0 5 0
9 2XMM J135315.8+634546 Sy1 13 53 15.8311116864 +63 45 45.683126676   14.54 14.28     ~ 404 1
10 2MASS J15033552+6235136 HB* 15 03 35.5297229952 +62 35 13.487488512           A0 5 0
11 Mrk 290 Sy1 15 35 52.4031021552 +57 54 09.515660508   15.55 15.27     ~ 575 0
12 2MASS J15391524+5757316 HB* 15 39 15.2463120720 +57 57 31.746198960           ~ 6 0
13 NAME HVC Complex C HVC 16 34.8 +63 07           ~ 273 1
14 SDSS J172009.78+612502.3 HB* 17 20 09.7780073736 +61 25 02.320428828           A0 5 0
15 2MASS J17342400+6017354 HB* 17 34 24.0020707632 +60 17 35.500977204           A0 5 0
16 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
17 MCG-02-53-003 G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 470 1
18 NAME IV Arch PoC ~ ~           ~ 69 1

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