J/ApJ/718/L141 FUV diffuse emission from the LMC (Pradhan+, 2010)
Far-ultraviolet diffuse emission from the Large Magellanic Cloud.
Pradhan A.C., Pathak A., Murthy J.
<Astrophys. J., 718, L141-L144 (2010)>
=2010ApJ...718L.141P 2010ApJ...718L.141P
ADC_Keywords: Magellanic Clouds ; Ultraviolet
Keywords: Magellanic Clouds - ultraviolet: ISM
Abstract:
We present the first observations of diffuse radiation in the
far-ultraviolet (FUV; 1000-1150Å) from the Large Magellanic Cloud
based on observations made with the Far Ultraviolet Spectroscopic
Explorer. The fraction of the total radiation in the field emitted as
diffuse radiation is typically 5%-20% with a high of 45% near N70
where there are few exciting stars, indicating that much of the
emission is not due to nearby stars. Much less light is scattered in
the FUV than at longer wavelengths, with the stellar radiation going
into heating the interstellar dust.
Description:
There are more than 600 FUSE pointings in and around the LMC, and we
have examined all for suitability for diffuse measurements. We
immediately rejected all observations which specifically observed a
bright star in the LWRS (30"x30") aperture but there were others where
a star was coincidentally in the aperture. These were identified and
rejected through their FWHM, which is less than 20 pixels for a point
source but about 30 pixels for an aperture filling diffuse source. We
were finally left with 81 observations of the diffuse radiation in
different parts of the LMC.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 122 81 Details of FUSE observations
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See also:
VI/129 : The FUSE Observation Log (FUSE, 1999-2007)
J/PASP/121/634 : FUSE observations in Magellanic Clouds (Blair+, 2009)
J/ApJ/622/294 : STIS UV spectra of LMC PNe (Stanghellini+, 2005)
J/MNRAS/357/645 : LMC far-UV HST observations (Almoznino+, 2005)
J/AJ/117/206 : LMC far-ultraviolet imaging (Brosch+, 1999)
J/AJ/116/180 : Magellanic clouds ultraviolet observations (Parker+ 1998)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- Name Target name
16- 17 I2 h RAh Hour of Right Ascension (J2000)
19- 20 I2 min RAm Minute of Right Ascension (J2000)
22- 25 F4.1 s RAs Second of Right Ascension (J2000)
26 A1 --- --- [0]
28 A1 --- DE- Sign of the Declination (J2000)
29- 30 I2 deg DEd Degree of Declination (J2000)
32- 33 I2 arcmin DEm Arcminute of Declination (J2000)
35- 36 I2 arcsec DEs Arcsecond of Declination (J2000)
37- 38 A2 --- --- [.0]
40- 44 F5.2 10+5ph/cm2/s/sr/nm LiF1A1 1A1 (1004Å) surface brightness (1)
46- 49 F4.2 10+5ph/cm2/s/sr/nm e_LiF1A1 Uncertainty in LiF1A1
51- 55 F5.2 10+5ph/cm2/s/sr/nm LiF1A2 1A2 (1058Å) surface brightness (1)
57- 60 F4.2 10+5ph/cm2/s/sr/nm e_LiF1A2 Uncertainty in LiF1A2
62- 67 F6.3 10+5ph/cm2/s/sr/nm LiF1B1 1B1 (1117Å) surface brightness (1)
69- 72 F4.2 10+5ph/cm2/s/sr/nm e_LiF1B1 Uncertainty in LiF1B1
74- 78 F5.2 10+5ph/cm2/s/sr/nm LiF1B2 1B2 (1157Å) surface brightness (1)
80- 83 F4.2 10+5ph/cm2/s/sr/nm e_LiF1B2 Uncertainty in LiF1B2
85- 89 F5.2 10+5ph/cm2/s/sr/nm LiF2A1 2A1 (1159Å) surface brightness (1)
91- 94 F4.2 10+5ph/cm2/s/sr/nm e_LiF2A1 Uncertainty in LiF2A1
96-100 F5.2 10+5ph/cm2/s/sr/nm LiF2A2 2A2 (1112Å) surface brightness (1)
102-105 F4.2 10+5ph/cm2/s/sr/nm e_LiF2A2 Uncertainty in LiF2A2
107-111 F5.2 10+5ph/cm2/s/sr/nm LiF2B1 2B1 (1056Å) surface brightness (1)
113-116 F4.2 10+5ph/cm2/s/sr/nm e_LiF2B1 Uncertainty in LiF2B1
118-122 F5.2 10+5ph/cm2/s/sr/nm UIT ? Ultraviolet Imaging Telescope (UIT)
surface brightness (1)
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Note (1): In units of 104photons/cm2/s/sr/Angstroms. The error in the
UIT data is around 10% (Parker et al. 1998, Cat. J/AJ/116/180).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 08-Jun-2012