J/ApJ/647/312 FUSE survey of OVI in the Milky Way (Otte+, 2006)
The Far Ultraviolet Spectroscopic Explorer survey of O VI emission in the
Milky Way.
Otte B., Dixon W.V.D.
<Astrophys. J., 647, 312-327 (2006)>
=2006ApJ...647..312O 2006ApJ...647..312O
ADC_Keywords: Ultraviolet ; Interstellar medium
Keywords: Galaxy: disk - Galaxy: halo - ISM: general - ISM: structure -
ultraviolet: ISM
Abstract:
We present a survey of OVI λ1032 emission in the Milky Way
using data from the Far Ultraviolet Spectroscopic Explorer (FUSE)
satellite. The observations span the period from launch in 1999 to
2003 July. Our survey contains 112 sight lines, 23 of which show
measurable OVI λ1032 emission. The OVI λ1032 emission
feature was detected at all latitudes and exhibits intensities of
1900-8600photons/s/cm2/sr. Combined with values from the
literature, these emission measurements are consistent with the
picture derived from recent OVI absorption surveys: high-latitude
sight lines probe OVI-emitting gas in a clumpy, thick disk or halo,
while low-latitude sight lines sample mixing layers and interfaces in
the thin disk of the Galaxy.
Description:
The data used in our survey consist of LiF1A LWRS spectra from the
S405 and Z907 programs (as of 2003 July 25) taken in time-tag mode.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 115 112 Observations
table2.dat 98 23 OVI λ1032Å detections
table3.dat 62 89 OVI λ1032Å 3σ upper limits
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See also:
J/ApJ/647/328 : FUSE survey of OVI in ISM
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- LOS Line of sight
8-115 A108 --- FUSE-ID FUSE observation identification(s)
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- LOS Line of sight
8- 14 F7.3 deg GLON Galactic longitude
16- 22 F7.3 deg GLAT Galactic latitude
24- 28 I5 s ExpTime Exposure time (night only)
30- 32 F3.1 10+3ph/s/cm2/sr Int OIV λ1032Å intensity
(in LU units) (G1)
34- 36 F3.1 10+3ph/s/cm2/sr e_Int Uncertainty in Int
38- 44 F7.2 0.1nm lambda Heliocentric wavelength
46- 49 F4.2 0.1nm e_lambda Uncertainty in lambda
51- 53 I3 km/s FWHM Gaussian Full-Width at Half-Maximum
55- 57 I3 km/s e_FWHM Uncertainty in FWHM
59- 62 F4.2 --- Rchi2 Reduced chi squared (χ2/ν)
64- 65 I2 % 1-PF Confidence level obtained from the
F test
67- 70 I4 km/s VLSR Local Standard of Rest velocity
72- 73 I2 km/s e_VLSR Uncertainty in VLSR
75- 79 F5.3 mag E(B-V) E(B-V) extinction from Schlegel et al.
(1998ApJ...500..525S 1998ApJ...500..525S)
81- 84 I4 10-6ct/s/arcmin2 SXR ROSAT 1/4keV emission (in RU unit)(G2)
86- 87 I2 10-6ct/s/arcmin2 e_SXR Uncertainty in SXR
89- 92 I4 10+3ph/s/cm2/sr IntHa ? Hα intensity (in LU units)(G3)
94 I1 10+3ph/s/cm2/sr e_IntHa ? Uncertainty in IntHa
96- 98 A3 --- HVC Line of sight intersection with a
High Velocity Cloud (G4)
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- LOS Line of sight
8- 14 F7.3 deg GLON Galactic longitude
16- 22 F7.3 deg GLAT Galactic latitude
24- 28 I5 s ExpTime Exposure time (night only)
30- 32 F3.1 10+3ph/s/cm2/sr 3slimit OIV λ1032Å intensity 3σ
detection limit (in LU unit) (G1)
34- 39 F6.3 mag E(B-V) E(B-V) extinction from Schlegel et al.
(1998ApJ...500..525S 1998ApJ...500..525S)
41- 44 I4 10-6ct/s/arcmin2 SXR ROSAT 1/4keV emission (in RU unit)(G2)
46- 48 I3 10-6ct/s/arcmin2 e_SXR Uncertainty in SXR
50- 54 I5 10+3ph/s/cm2/sr IntHa ? Hα intensity (in LU unit)(G3)
56 I1 10+3ph/s/cm2/sr e_IntHa ? Uncertainty in IntHa
58- 62 A5 --- HVC Line of sight intersection with a
High Velocity Cloud (G4)
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Global notes:
Note (G1): For O VI (1032), 1LU=4.5e-22erg/s/cm2/arcsec2.
Note (G2): From Snowden et al. (1997ApJ...485..125S 1997ApJ...485..125S). 1RU=10-6cts/s/arcmin2.
Note (G3): Integrated over the velocity range -80 to +80km/s. An
uncertainty of 0 means that the intensity is the average of the
neighboring pointings (Haffner et al., 2003i, Cat. II/249). For
Hα, 1LU=7.1e10-23erg/s/cm2/arcsec2.
Note (G4): Based on H1 map in Wakker et al. (2003, Cat. J/ApJS/146/1).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 08-Jul-2008