J/ApJ/463/205 CS and NH3 Survey of H2O Maser Emission (Anglada+ 1996)
A CS and NH3 Survey of H2O Maser Emission
Anglada G., Estalella R., Pastor J., Rodriguez L.F., Haschick A.D.
<Astrophys. J. 463, 205 (1996)>
=1996ApJ...463..205A 1996ApJ...463..205A
ADC_Keywords: Masers ; Radio lines
Keywords: ISM: clouds; ISM: molecules; masers; radio lines: molecular;
lines, interstellar; stars: formation of
Abstract:
CS J=1-0 and NH(J,K)=(1,1) observations toward a large sample of H2O
maser regions are reported. A total of 172 sources were observed. 107
were observed in CS and 164 in NH3. The main purpose of this work
was to study the relationship between the parameters that characterize
the high velocity H2O maser emission, which originates in very small
(about 10 AU) and very dense (107-109/cm3) regions, and those that
characterize the molecular emission coming from quiescent, more
extended (0.1-1.0 pc) high density (104-105/cm3) regions, traced
by the CS and NH3 emissions. The observations were carried out
between 1986 and 1990 with the 37 m radio telescope at Haystack
Observatory The emission of the (J,K)=(1,1) inversion transition of
the NH3 molecule at 23.694496 GHz, and the emission of the J=1->0
rotational transition of the CS molecule at 48.990968 GHz were
observed.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
aaspp4.sty 109 490 Style file for csh2o.txt
csh2o.txt 74 863 *The original paper in ASCII
csh2o.tex 93 982 *The original paper in LaTeX
table1.dat 83 204 *Regions with known H2O maser emission
table2.dat 90 106 Parameters of CS and NH3 maser emission
table5.dat 89 106 H2O masers detected in CS or NH3
refs.dat 80 241 References
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Note on csh2o.tex and csh2o.txt:
These are complete except for the following portions: Tables 1, 2, and 5
and the references (these are in separate files); the figure captions
(the figures are unavailable and are described in the text); the notes
and references for tables 1 and 5 (as table refs.dat)
Note on table1.dat:
Known interstellar H2O masers with δ > -38° in August 1986.
Reference numbers were changed to agree with those of Table 5.
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- ID Region name
17- 18 I2 h RAh Right Ascension B1950 (hours)
19- 20 I2 min RAm Right Ascension B1950 (minutes)
21- 24 F4.1 s RAs Right Ascension B1950 (seconds)
25 A1 --- DE- Declination B1950 (sign)
26- 27 I2 deg DEd Declination B1950 (degrees)
28- 29 I2 arcmin DEm Declination B1950 (minutes)
30- 33 F4.1 arcsec DEs Declination B1950 (seconds)
35- 36 I2 --- r_Vel Reference to data
38- 42 F5.1 km/s Vel ?Central velocity of the observed bandwidth
44- 49 F6.3 K sigCS ?1σ sensitivity for CS
51- 54 A4 --- det_CS [Yes No ?] Has CS been detected?
56- 60 F5.3 K sigNH3 ?1σ sensitivity for NH3 (23.69GHz)
62- 65 A4 --- det_NH3 [Yes No ?] Has NH3 been detected?
67 A1 --- note *[abc] Note
69- 83 A15 --- altID Other name for region
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Note on note:
a = Detection has been obtained by adding several positions from a
five-points map.
b = Includes G32.80+0.19 (1) and G32.80+0.19 (2).
c = Includes G32.75+0.08.
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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- 16 A16 --- ID Region designation
18- 21 F4.2 K Ta_CS ?Antenna temperature for CS
23- 26 F4.2 K eTaCS ?Mean error of Ta for CS
28- 34 F7.2 km/s VelCS ?Central velocity of CS line
36- 39 F4.2 km/s e_VelCS ?Mean error of VelCS
41- 46 F6.2 km/s dVelCS ?Line width (FWHM) for CS
48- 51 F4.2 km/s e_dVelCS ?Mean error of dVelCS
56- 59 F4.2 K Ta_NH3 ?Antenna temperature for NH3 (23.69GHz)
61- 64 F4.2 K eTaNH3 ?Mean error of Ta for NH3
67- 73 F7.2 km/s VelNH3 ?Central velocity of NH3 line (23.69GHz)
75- 78 F4.2 km/s e_VelNH3 ?Mean error of VelNH3
80- 85 F6.2 km/s dVelNH3 ?Line width (FWHM) for NH3
87- 90 F4.2 km/s e_dVelNH3 ?Mean error of dVelNH3
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- ID Region
17- 21 F5.1 km/s Velmin Minimum of velocity range for H2O
24- 28 F5.1 km/s Velmax Maximum of velocity range for H2O
31- 35 F5.1 km/s Velm Velocity of the maximum emission
38- 42 F5.1 km/s Vela *Average of the mean velocities
45- 49 F5.1 km/s Velc Velocity centroid of the maser emission
52- 67 A16 --- r_Vel Reference(s) for H2O data
69- 73 F5.1 km/s Vel *Velocity of the high-density gas
75- 78 F4.1 kpc dist ?Distance of region
80- 81 I2 --- r_dist ?Reference to region data
83- 90 E8.1 solLum L(H2O) ?Maximum Luminosity of H2O emission
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Note on Vela:
Average of the mean velocities of the components of each spectrum.
Note on Vel:
Velocity of the high-density gas, taken as the average of the
velocities of the CS and NH3 emission.
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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- 2 I2 --- RefNo *?=0 Reference number
4- 9 A6 --- RefID Reference abbreviation
11- 80 A70 --- Text Text of reference, starting by the
19-digit bibcode
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Note on RefNo:
All references are included in this table, and RefNo is repeated
when several lines are necessary.
Note that the reference numbers of table1.dat were changed compared
to the printed version, to agree with the reference numbers used
in table5.dat.
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Table 3: Summary of the sources observed in CS or NH3
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CS NH3
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Observed sources 107 164
Detected sources (SNR>5) 75 82
Detected sources (3<SNR<5) 2 13
Non-detected sources (SNR<3) 30 69
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Table 4: Summary of the sources observed both in CS and NH3
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Strength a b c
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Detected in NH3 (SNR>5) 61 1 9
Detected in NH3 (3<SNR<5) 4 0 2
Non-detected in NH3 (SNR<3) 8 1 13
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a: Detected in CS (SNR>5)
b: Detected in CS (3<SNR,5)
c: Non-detected in CS (SNR<3)
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(End) N. G. Roman [ADC/SSDOO] 22-Jul-1997, rev. F. Ochsenbein [CDS] 01-Jan-2000