2003ApJ...597..948P


Query : 2003ApJ...597..948P

2003ApJ...597..948P - Astrophys. J., 597, 948-956 (2003/November-2)

Hα emission from high-velocity clouds and their distances.

PUTMAN M.E., BLAND-HAWTHORN J., VEILLEUX S., GIBSON B.K., FREEMAN K.C. and MALONEY P.R.

Abstract (from CDS):

We present deep Hα spectroscopy toward several high-velocity clouds (HVCs), which vary in structure from compact HVCs (CHVCs) to the Magellanic Stream. The clouds range from being bright (∼640 mR) to having upper limits on the order of 30-70 mR. The Hα measurements are discussed in relation to their H I properties, and distance constraints are given to each of the complexes based on f{d4}esc~6% of the ionizing photons escaping normal to the Galactic disk (fesc~1%-2% when averaged over solid angle). The results suggest that many HVCs and CHVCs are within a ∼40 kpc radius from the Galaxy and are not members of the Local Group at megaparsec distances. However, the Magellanic Stream is inconsistent with this model and needs to be explained. It has bright Hα emission and little [N II] emission and appears to fall into a different category than the currently detected HVCs. This may reflect the lower metallicities of the Magellanic Clouds compared to the Galaxy, but the strength of the Hα emission cannot be explained solely by photoionization from the Galaxy. The interaction of the Magellanic Stream with halo gas or the presence of yet unassociated young stars may assist in ionizing the Magellanic Stream.

Abstract Copyright:

Journal keyword(s): Cosmology: Diffuse Radiation - Galaxies: Individual: Name: Magellanic Stream - Galaxies: ISM - Galaxy: Halo - Galaxies: Intergalactic Medium

CDS comments: Parts of HVC complexes not in SIMBAD (ex: Complex L = [H68] L, L1 not in S.)

Simbad objects: 24

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Number of rows : 24
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 HVC 104.2-48-168 HVC 00 00 +13.0           ~ 2 0
2 NAME Magellanic Stream HVC 00 32 -30.0           ~ 902 1
3 HVC 119.2-31.1-384 HVC 00 36.2 +31 39           ~ 4 0
4 HVC 118.2-58.1-373 HVC 00 41.5 +04 39           ~ 3 0
5 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1250 4
6 ESO 113-45 Sy1 01 23 45.7631533440 -58 48 20.808928944   14.08 13.83 13.34   ~ 823 0
7 NAME Magellanic Stream I HVC 01 24 -58.8           ~ 19 0
8 HVC 197.0-81.0-184 HVC 01 26.2 -24 37           ~ 5 0
9 HVC 130+01-161 HVC 01 55.9 +60 38           ~ 52 0
10 HVC 158-39-285 HVC 02 41.3 +16 07           ~ 9 0
11 NAME Magellanic Bridge HI 03 11 -77.5           ~ 395 1
12 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16244 1
13 [PDS2002] HIPASS HVC 1033 HVC 07 15.4 -55 05           ~ 8 0
14 NAME HVC Complex A HVC 08 36 +64.4           ~ 124 0
15 NAME HVC Complex M HVC 10 48.2 +48 00           ~ 75 0
16 HVC 287.6+17.1+111 HI 11 30.2 -43 18           ~ 3 0
17 HVC 310.5+44.2+187 HVC 13 14.2 -18 20           ~ 5 0
18 [H68] L HVC 15 06.4 -15 30           ~ 17 0
19 NAME HVC Complex C HVC 16 34.8 +63 07           ~ 242 1
20 HVC 321.7-16.0+113 HVC 16 56.8 -69 20           ~ 3 0
21 LEDA 3097116 G 17 12 35.0 -64 38 11           ~ 15 0
22 NAME Gal Center Positive HVC 20 51.2 +01 41           ~ 87 1
23 NAME Local Group GrG ~ ~           ~ 7765 0
24 NAME Magellanic Stream II HVC ~ ~           ~ 21 0

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2022.09.26-14:09:29

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