J/other/PASAu/6.471 Magellanic Clouds bridge region HI profiles (McGee+ 1986)
HI profiles in the bridge region of the Magellanic Clouds
McGee R.X., Newton L.M.
<Proc. Astron. Soc. Australia, 6, 471-500 (1986)>
=1986PASAu...6..471M 1986PASAu...6..471M (SIMBAD/NED BibCode)
ADC_Keywords: Magellanic Clouds ; H I data ; Radial velocities
Abstract:
Two hundred and seventeen HI profiles at positions approximately
1degree apart in the bridge region between the Small and Large
Magellanic Clouds have been observed with a 15' arc beam. Diagrams of
all the profiles, lists of column densities and average radial
velocities are given, together with details of the extensive Gaussian
analysis needed to account for the components. It is shown that the
bridge region is most complex. (a) Two radial velocity (1) groups, +214
and +238km/s, represent the actual HI bridge between the two galaxies.
(b) Three other components, at mean radial velocities of +155, +177
and +195km/s are seen to be integral parts of the SMC, stretching east
to RA∼04h. (c) A further three components in groups at mean radial
Velocities +253, +272 and +293km/s appear to be extensions of HI from
the main body of the LMC. Nine sets of five closely spaced
observations in the lower Magellanic Stream and in the bridge region
at high sensitivity supply further information about the region.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 100 214 Radial velocities and column densities for
neutral hydrogen
table2 68 45 Gaussian components of H-line profiles of nine
sets of five closely spaced positions
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Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right ascension (1950)
4- 5 I2 min RAm Right ascension (1950)
7 A1 --- DE- Declination sign
8- 9 I2 deg DEd Declination (1950)
11- 13 I3 km/s RV ? Total profile radial velocity (1)
15- 19 F5.2 10+20cm-2 NH ? Hydrogen column density from the whole profile
21- 23 I3 km/s RV1 ? Gaussian radial velocity (1)
24 A1 --- n_RV1 [*] *: Low featureless 190+320; no fittings
attempted.
26- 30 F5.2 10+19cm-2 NH1 ? Gaussian hydrogen column density
32- 34 I3 km/s RV2 ? Gaussian radial velocity (1)
36- 40 F5.2 10+19cm-2 NH2 ? Gaussian hydrogen column density
42- 44 I3 km/s RV3 ? Gaussian radial velocity (1)
46- 50 F5.2 10+19cm-2 NH3 ? Gaussian hydrogen column density
52- 54 I3 km/s RV4 ? Gaussian radial velocity (1)
56- 60 F5.2 10+19cm-2 NH4 ? Gaussian hydrogen column density
62- 64 I3 km/s RV5 ? Gaussian radial velocity (1)
66- 70 F5.2 10+19cm-2 NH5 ? Gaussian hydrogen column density
72- 74 I3 km/s RV6 ? Gaussian radial velocity (1)
76- 80 F5.2 10+19cm-2 NH6 ? Gaussian hydrogen column density
82- 84 I3 km/s RV7 ? Gaussian radial velocity (1)
86- 90 F5.2 10+19cm-2 NH7 ? Gaussian hydrogen column density
92- 94 I3 km/s RV8 ? Gaussian radial velocity (1)
96-100 F5.2 10+19cm-2 NH8 ? Gaussian hydrogen column density
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Note (1): Radial velocities referred to the Sun
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Byte-by-byte Description of file: table2
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right ascension (1950)
4- 5 I2 min RAm Right ascension (1950)
7- 8 I2 s RAs Right ascension (1950)
10 A1 --- DE- Declination sign
11- 12 I2 deg DEd Declination (1950)
14- 15 I2 arcmin DEm Declination (1950)
17- 18 I2 arcsec DEs Declination (1950)
20- 22 I3 km/s RV1 ? Gaussian radial velocity (1)
24- 28 F5.2 10+19cm-2 NH1 ? Gaussian hydrogen column density
30- 32 I3 km/s RV2 ? Gaussian radial velocity (1)
34- 38 F5.2 10+19cm-2 NH2 ? Gaussian hydrogen column density
40- 42 I3 km/s RV3 ? Gaussian radial velocity (1)
44- 48 F5.2 10+19cm-2 NH3 ? Gaussian hydrogen column density
50- 52 I3 km/s RV4 ? Gaussian radial velocity (1)
54- 58 F5.2 10+19cm-2 NH4 ? Gaussian hydrogen column density
60- 62 I3 km/s RV5 ? Gaussian radial velocity (1)
64- 68 F5.2 10+19cm-2 NH5 ? Gaussian hydrogen column density
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Note (1): Radial velocities referred to the Sun
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History: Prepared via OCR at CDS.
(End) Marie-Jose Wagner, Patricia Bauer [CDS] 03-Sep-1996