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J/ApJ/702/940   Radio and UV spectra of HVC toward the MC  (Lehner+, 2009)

Properties and origin of the high-velocity gas toward the Large Magellanic Cloud. Lehner N., Staveley-Smith L., Howk J.C. <Astrophys. J., 702, 940-954 (2009)> =2009ApJ...702..940L
ADC_Keywords: Stars, early-type ; Magellanic Clouds ; Spectra, ultraviolet ; Radio lines Keywords: galaxies: halos - galaxies: interactions - galaxies: kinematics and dynamics - galaxies: structure - Magellanic Clouds Abstract: In the spectra of 139 early-type Large Magellanic Cloud (LMC) stars observed with Far Ultraviolet Spectroscopic Explorer and with deep radio Parkes HI 21cm observations along with those stars, we search for and analyze the absorption and emission from high-velocity gas at +90≤νLSR≤+175km/s. The HI column density of the high-velocity clouds (HVCs) along these sightlines ranges from <1018.4 to 1019.2cm-2. The incidence of the HVC metal absorption is 70%, significantly higher than the HI emission occurrence of 32%. We find that the mean metallicity of the HVC is [OI/HI]=-0.51±0.120.16. This is the first example of a large (>106M) HVC complex that is linked to stellar feedback occurring in a dwarf spiral galaxy. Description: We retrieved fully calibrated spectra from the FUSE Magellanic Clouds Legacy Project archive at the Multimission Archive at STScI ( The spectra of 10 stars in our sample were obtained with both FUSE and HST/STIS E140M. Two data sets were used for the HI 21cm data: the LMC HI survey campaign undertaken by Staveley-Smith et al. (2003MNRAS.339...87S) using the Parkes 21cm multi-beam receiver. We also systematically used the more recent survey undertaken by McClure-Griffiths et al. (2009ApJS..181..398M), the Parkes Galactic All-Sky Survey (GASS). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 140 139 Summary of the measurements for the high-velocity clouds (HVCs) toward the LMC
See also: B/hst : HST Archived Exposures Catalog (STScI, 2007) J/ApJS/171/419 : Catalog of LMC HI clouds (Kim+, 2007) J/ApJ/623/181 : Compact high-velocity cloud photometry catalog (Siegel+, 2005) J/MNRAS/357/645 : LMC far-UV HST observations (Almoznino+, 2005) J/A+A/391/159 : A search for Compact High-Velocity Clouds (De Heij+, 2002) J/AJ/123/873 : HIPASS high-velocity clouds (Putman+, 2002) J/ApJS/140/331 : High-velocity HI observations at 21cm (Lockman+, 2002) J/ApJS/136/463 : Distances and metallicities of HVCs and IVCs (Wakker, 2001) J/AJ/117/206 : LMC far-ultraviolet imaging (Brosch+, 1999) J/ApJS/79/77 : Bell Lab. H I Survey - High Velocity Clouds (Stark+ 1992) : FUSE Magellanic Clouds Legacy Project page Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Name Star name (1) 13 A1 --- f_Name [a] spectra from HST/STIS E140M and FUSE 15- 20 F6.4 h RAhour Right ascension in decimal hour (J2000) 22- 29 F8.4 deg DEdeg Declination in decimal degree (J2000) 31- 35 F5.1 km/s nuOI ? OI FUSE velocity (ν) (4)(3) 37- 39 F3.1 km/s e_nuOI ? nuOI uncertainty 41 A1 --- l_logNOI Limit flag on logNOI 42- 46 F5.2 [cm-2] logNOI ? OIλ1039 column density (N(OI)) (5) 48- 51 F4.2 [cm-2] e_logNOI ? Lower limit uncertainty in logNOI 53- 56 F4.2 [cm-2] E_logNOI ? Upper limit uncertainty in logNOI 58- 62 F5.1 km/s nuFeII ? FeII FUSE velocity (ν) (4)(3) 64- 66 F3.1 km/s e_nuFeII ? nuFeII uncertainty 68 A1 --- l_logNFeII Limit flag on logNFeII 69- 73 F5.2 [cm-2] logNFeII ? FeII 1144 column density (N(FeII)) (5) 75- 78 F4.2 [cm-2] e_logNFeII ? Lower limit uncertainty in logNFeII 80- 83 F4.2 [cm-2] E_logNFeII ? Upper limit uncertainty in logNFeII 85- 89 F5.1 km/s nuHI ? HI velocity (ν) (4) 91- 94 F4.1 km/s e_nuHI ? nuHI uncertainty 96 A1 --- l_logNHI Limit flag on logNHI 97-101 F5.2 [cm-2] logNHI ? HI column density (N(HI)) 103-106 F4.2 [cm-2] e_logNHI ? Uncertainty in logNHI 108 A1 --- l_[FeII/OI] Limit flag on [FeII/OI] 109-113 F5.2 [-] [FeII/OI] ? Ratio [FeII/OI] corrected for the solar oxygen abundance 115-118 F4.2 [-] e_[FeII/OI] ? Lower limit uncertainty in [FeII/OI] 120-123 F4.2 [-] E_[FeII/OI] ? Upper limit uncertainty in [FeII/OI] 125 A1 --- l_[OI/HI] Limit flag on [OI/HI] 126-130 F5.2 [-] [OI/HI] ? Ratio [OI/HI] corrected for the solar oxygen abundance (6) 132-135 F4.2 [-] e_[OI/HI] ? Lower limit uncertainty in [OI/HI] 137-140 F4.2 [-] E_[OI/HI] ? Upper limit uncertainty in [OI/HI]
Note (1): HV2243 is very likely a misprint for HV2543. Note (3): The FUSE velocities (OI and FeII) have an additional systematic error of about 5-10km/s. Note (4): The values of the velocity, ν, is obtained from ν=∫νNa(ν)dν/Na (see Sembach & Savage 1992ApJS...83..147S). See section 2.2.3 for further details. Note (5): Measurements and limits on N(OI) and N(FeII) are primarily based on the OIλ1039 and FeIIλ1144 lines, except for Sk-69 246, where OIλ1302 and FeIIλ1608 only are used as the weaker transitions are not detected. Note (6): For [O/H], there is an additional ±0.08dex "beam" error (see Section 2.4 for more details). For the limits on the [O/H], the errors on N(OI) or N(HI) were taken into account, i.e., the upper limits are quoted as the limit +1σ (statistical uncertainty). The adopted solar references are [O/H]=-3.27 and [Fe/O]=-1.26 from Lodders et al. (2009LanB...4B...44L).
History: From electronic version of the journal
(End) Emmanuelle Perret [CDS] 30-Sep-2011
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