J/PASJ/67/90 Central Molecular Zone in H13CO+ (Tsuboi+, 2015)
The Central Molecular Zone in H13CO+ and thermal SiO emission lines.
Tsuboi M., Miyazaki A., Uehara K.
<Publ. Astron. Soc. Jap., 67, 90 (2015)>
=2015PASJ...67...90T 2015PASJ...67...90T (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Interstellar medium ; Molecular clouds
Keywords: Galaxy: center - ISM: bubbles - ISM: clouds - ISM: molecules -
stars: formation
Abstract:
We present results from a high-resolution wide-field imaging
observation of the Central Molecular Zone (CMZ) in H13CO+ J=1-0
and SiO v=0, J=2-1 emission lines using the 45-m telescope at the
Nobeyama Radio Observatory in order to depict the high-density
molecular gas mass distribution and explore molecular gas affected by
interstellar shocks. By using the clumpfind algorithm we identify 114
molecular clumps in the H13CO+ data cube.
Description:
We performed simultaneous observations of the CMZ in the H13CO+
J=1-0 (ν=86.754330GHz) and SiO v=0, J=2-1 (ν=86.847010GHz)
emission lines of the NRO 45-m telescope from 2007 February to 2009
May. We used the 25-beam (5x5) 100-GHz band Superconductor Insulator
Superconductor (SIS) receiver installed on the telescope. The full
width at half maximum (FWHM) of the 45-m telescope beam was 20" at
86GHz. The typical aperture efficiency and main beam efficiency were
40% and 50%, respectively, at 86GHz. The typical system temperature
during the observations was about 300K in Double Side Band mode (DSB).
The back-end spectrometers were digital auto-correlators, each of
which covered a bandwidth of about 512MHz with a spectral resolution
of 500kHz for one beam. These parameters correspond to about 1740km/s
for velocity coverage and 1.8km/s for velocity resolution. The
frequency separation between the emission lines is about 93MHz, which
corresponds to velocity differences of 320km/s.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 61 21 Mass of the molecular clouds in the Central
Molecular Zone
table3.dat 56 114 Identified molecular clumps in the Central
Molecular Zone
table4.dat 57 6 Expanding molecular shells in the Sagittarius B2
molecular cloud complex
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See also:
J/ApJS/213/22 : Central Molecular Zone NIR polarimetry (Yoshikawa+, 2014)
J/ApJ/799/53 : Central Molecular Zone YSO/MS star models (Koepferl+, 2015)
J/A+A/586/A50 : Central Molecular Zone H2O temperature maps (Ginsburg+, 2016)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name Molecular cloud
18- 20 I3 km/s bVel Lower value of velocity range
22 A1 --- --- [-]
24- 26 I3 km/s BVel Upper value of velocity range
28- 33 E6.2 Msun MLTE(H13CO+) LTE molecular mass estimated from the
H13CO+ J=1-0 emission line
intensity (1)
35- 36 A2 --- l_Mvir(H13CO+) [≤ ] Limit flag on Mvir(H13CO+)
37- 42 E6.2 Msun Mvir(H13CO+) Virial mass from the size and velocity
width in the H13CO+ line
44- 49 E6.2 Msun MLTE(CS) ? Molecular gas mass traced by the
CS emission line (2)
51- 54 F4.2 --- GAMMA Ratio of the LTE molecular gas mass
estimates (3)
56- 61 E6.2 cm-3 nmin ? Tidal shear (nmin) (4)
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Note (1): We assumed X(H13CO+)=5x10-11, Tex=5K, and optically thin.
Note (2): We assumed X(CS)=1x10-8, Tex=10K, and τ=1.
Note (3): GAMMA=MLTE(H13CO+)/MLTE(CS).
Note (4): nmin[cm-3]∼2.5x107(1/r[pc]3+ 1/r[pc]1.8)
(Tsuboi et al. 2011PASJ...63..763T 2011PASJ...63..763T).
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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- 3 I3 --- Seq Molecular clump sequential number
5- 10 F6.3 deg GLON [-1/1] Galactic longitude
12- 17 F6.3 deg GLAT Galactic latitude
19- 23 F5.1 km/s VLSR LSR velocity
25- 28 F4.2 pc R Intrisic radius
30- 34 F5.2 km/s DV Velocity width (ΔV)
36- 42 E7.2 Msun Mvir Viral mass
44- 50 E7.2 Msun MLTE LTE mass
52- 56 F5.1 --- alpha Viral parameter, Mvir/MLTE
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- --- [Shell]
7 I1 --- Shell Shell number
10- 13 F4.2 deg GLONc Center Galactic longitude
14 A1 --- u_GLONc [)] Uncertainty flag on GLONc
17- 21 F5.2 deg GLATc Center Galactic latitude
22 A1 --- u_GLATc [)] Uncertainty flag on GLATc
25- 26 I2 pc Diam Diameter
27 A1 --- u_Diam [)] Uncertainty flag on Diam
29- 31 I3 km/s VW Velocity width
32 A1 --- u_VW [)] Uncertainty flag on VW
35- 40 E6.2 yr Age Upper limit of age
41 A1 --- u_Age [)] Uncertainty flag on Age
43- 48 E6.2 Msun MLTE(CS) ? LTE molecular gas mass based on CS
observations (1)
51- 57 E7.2 10-7W Ekin ? Kinetic energy
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Note (1): We assumed X(CS)=1x10-8, Tex=10K, and τ=1.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 15-Jan-2016