J/A+A/569/A125 Spiral structure of the Milky Way (Hou+, 2014)
The observed spiral structure of the Milky Way.
Hou L.G., Han J.L.
<Astron. Astrophys. 569, A125 (2014)>
=2014A&A...569A.125H 2014A&A...569A.125H
ADC_Keywords: Milky Way ; Galactic plane ; H II regions ; Masers ;
Molecular clouds ; Models
Keywords: Galaxy: disk - Galaxy: structure - Galaxy: kinematics and dynamics -
ISM: HII regions - ISM: clouds
Description:
We have updated the catalogs of Galactic HII regions, giant molecular
clouds (GMCs), and 6.7-GHz methanol masers to outline the spiral
structure of our Galaxy. The related parameters have been collected
and (re)calculated based on the data in the literature. In particular,
for each spiral tracer, we list the photometric or trigonometric
distance, and/or the solutions of the kinematic distance ambiguity
(KDA) when available. The kinematic distances when adopted are
calculated using a flat rotation curve with two sets of R0,
Θ0, and solar motions, where one set is the IAU standard and
the other is from the new observational results. The rotation curve of
Brand & Blitz (1993, Cat. J/A+A/275/67) is also used to derive the
kinematic distances.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 245 4551 HII regions as tracers of spiral arms
tablea2.dat 189 1348 Giant molecular clouds
tablea3.dat 142 948 6.7-GHz methanol masers
refs.dat 158 147 References
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See also:
J/A+A/275/67 : Velocity Field of the outer Galaxy (Brand+ 1993)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq [1/2537] Number of Galactic HII region
6- 12 F7.3 deg GLON Galactic longitude of HII region
13- 19 F7.3 deg GLAT Galactic latitude HII region
22- 27 A6 --- Ref Reference for GLON and GLAT
29- 35 F7.2 km/s VLSR [-216/251]? LSR radial velocity
38- 42 F5.2 km/s e_VLSR ? Uncertainty in VLSR
43- 47 I5 K Te [2200/19000]? LTE Electron Temperature
51- 54 A4 --- Tel Abbreviations for telescopes (5)
56- 70 A15 --- Line Observed line(s) toward the HII region
72- 77 A6 --- r_VLSR Reference for VLSR and Te
79- 87 F9.4 Jy S ? Radio continuum flux density
88- 93 F6.3 GHz n_S [0.4/15]? Continuum frequency
95-101 A7 --- r_S Reference for continuum data
102 A1 --- u_S [?] Uncertainty flag flux and reference
103-108 F6.3 kpc Dist [0.1/12]? Photometric or trigonometric distance
110-115 F6.3 kpc e_Dist ? Uncertainty in Dist
117-123 A7 --- r_Dist Reference for Dist
124 A1 --- u_Dist [?] Uncertainty flag on distance and reference
126-130 A5 --- n_Dist KDA resolution (G1)
132-177 A46 --- Note Reference(s) and notes
178-183 F6.2 kpc R8.5 [0.2/38]? Distance to the GC (G2)
186-191 F6.2 kpc D8.5 [0.1/47]? Distance to the Sun (G2)
194-199 F6.2 pc/cm2 U8.5 [0.7/459]? Excitation parameter (G2)
201-206 F6.2 kpc R8.3 [0.2/34]? Distance to the GC (G3)
209-214 F6.2 kpc D8.3 [0.01/43]? Distance to the Sun (G3)
217-222 F6.2 pc/cm2 U8.3 [0.7/422]? Excitation parameter (G3)
224-229 F6.2 kpc Rbb93 [0.4/38]? Distance to the GC (G4)
232-237 F6.2 kpc Dbb93 [0.08/46]? Distance to the Sun (G4)
240-245 F6.2 pc/cm2 Ubb93 [0.7/469]? Excitation parameter (G4)
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Note (5): The abbreviations for telescopes are:
GBT = the Green Bank 100m telescope;
Are = the Arecibo 305m telescope;
B&M = the 7m telescope of the Bell Telescope Laboratories and the
5m telescope at the Millimeter Wave Observatory;
SET = the Swedish-ESO Submillimeter telescope;
OSO = the Onsala Space Observatory 20m telescope;
PKS = the Parkes 64m telescope;
GBO = the 42.6m telescope of the NRAO at Green Bank;
BRAL = the 25.8m telescope of the Berkeley Radio Astronomy Laboratory;
Eff = the Effelsberg 100m telescope;
XAO = the 25m telescope of Xinjiang Observatory;
LO = the 0.76m telescope at the Leuschner Observatory;
DRAO = The 25.6m telescope at the Dominion Radio Astrophysical Observatory;
ARO = the 46m telescope of the Algonquin Radio Observatory.
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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2- 8 F7.3 deg GLON Galactic longitude
10- 16 F7.3 deg GLAT Galactic latitude
18- 24 F7.2 km/s VLSR LSR radial velocity
26- 33 F8.2 kK.km/s/pc2 LCO ? Luminosity of CO emission line
34- 39 F6.2 kpc Dsun [0.4/22] Distance to the Sun
41- 46 F6.2 10+5Msun MGMC Mass of the GMC
48- 52 F5.2 deg dLon ? Cloud size in GLON direction
53- 57 F5.2 deg dLat ? Cloud size in GLAT direction
61- 67 F7.3 kpc Dist ? Photometric/trigonometric distance
69- 74 F6.3 kpc e_Dist ? Uncertainty in Dist
76- 83 A8 --- r_Dist Reference for Dist and e_Dist
85- 89 A5 --- n_Dist KDA resolution (G1)
91-118 A28 --- Ref Reference(s) and notes
122-127 F6.2 kpc R8.5 [1.6/29]? Distance to the GC (G2)
130-135 F6.2 kpc D8.5 [0.4/24]? Distance to the Sun (G2)
138-143 F6.2 10+5Msun M8.5 [0.02/263]? Mass of the GMC (G2)
145-150 F6.2 kpc R8.3 [1.6/24]? Distance to the GC (G3)
153-158 F6.2 kpc D8.3 [0.1/22]? Distance to the Sun (G3)
161-166 F6.2 10+5Msun M8.3 [0/262]? Mass of the GMC (G3)
168-173 F6.2 kpc Rbb93 [1.1/31]? Distance to the GC (G)
176-181 F6.2 kpc Dbb93 [0.6/24]? Distance to the Sun (G)
184-189 F6.2 10+5Msun Mbb93 [0/263]? Mass of the GMC (G)
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Byte-by-byte Description of file: tablea3.dat
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Bytes Format Units Label Explanations
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2- 8 F7.3 deg GLON Galactic longitude
9- 15 F7.3 deg GLAT Galactic latitude
18- 24 F7.2 km/s VLSRm [-129/154]? Median velocity of the maser lines
25- 31 F7.2 km/s VLSRp [-132/157]? Peak velocity of the maser lines
32- 37 A6 --- r_V Reference for GLON, GLAT and VLSR
39- 45 F7.3 kpc Dist [0.4/12]? Photometric/trigonometric distance
47- 52 F6.3 kpc e_Dist ? Uncertainty in Dist
55- 60 A6 --- r_Dist Reference for Dist
63- 67 A5 --- n_Dist KDA resulition (G1)
68-104 A37 --- Ref Reference(s) and notes
105-110 F6.2 kpc R8.5 [2.5/29]? Distance to the GC (G2)
111-116 F6.2 kpc D8.5 [0.1/37]? Distance to the Sun (G2)
118-123 F6.2 kpc R8.3 [2.6/26]? Distance to the GC (G3)
124-129 F6.2 kpc D8.3 [0/35]? Distance to the Sun (G3)
131-136 F6.2 kpc Rbb93 [2.5/30]? Distance to the GC (G4)
137-142 F6.2 kpc Dbb93 [0/39]? Distance to the Sun (G4)
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Ref Reference code
10- 28 A19 --- Bibcode Bibcode
31- 55 A25 --- Aut Author's name
58-158 A101 --- Com Comments
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Global notes:
Note (G1): Note for the KDA (Kinematic Distance Ambiguity) resolution:
knear = the nearer kinematic distance is adopted
kfar = the farther kinematic distance is adopted
ktan = the tracer is located at the tangential point
kout = the tracer is in the outer Galaxy
n3kpc = the tracer is located in the Near 3kpc Arm
f3kpc = the tracer is located in the Far 3kpc Arm
Note (G2): If the photometric or trigonometric distance is available for a
tracer, we adopt it directly. The kinematic distances when adopted
are calculated with a flat rotation curve with the IAU standard
R0=8.5kpc and Θ0=220km/s and the standard solar motions.
Note (G3): The kinematic distances when adopted are calculated with a flat
rotation curve with the new observed fundamental parameters R0=8.3kpc
and Θ0=239km/s (Brunthaler et al. 2011AN....332..461B 2011AN....332..461B) and the
solar motions of Schonrich et al. (2010MNRAS.403.1829S 2010MNRAS.403.1829S).
Note (G4): The kinematic distances when adopted are calculated with the
rotation curve of Brand & Blitz (1993A&A...275...67B 1993A&A...275...67B) with the IAU
standard R0=8.5kpc, Θ0=220km/s and the standard solar motions.
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Acknowledgements:
Ligang Hou, lghou(at)nao.cas.cn
(End) Patricia Vannier [CDS] 30-Jul-2014