J/MNRAS/418/1689 Red MSX water maser and ammonia emissions (Urquhart+, 2011)
The red MSX source survey: ammonia and water maser analysis of massive
star-forming regions.
Urquhart J.S., Morgan L.K., Figura C.C., Moore T.J.T., Lumsden S.L.,
Hoare M.G., Oudmaijer R.D., Mottram J.C., Davies B., Dunham M.K.
<Mon. Not. R. Astron. Soc., 418, 1689-1706 (2011)>
=2011MNRAS.418.1689U 2011MNRAS.418.1689U
ADC_Keywords: YSOs; Infrared sources ; Masers
Keywords: stars: formation - stars: early-type - ISM: molecules -
ISM: radio lines
Abstract:
The Red MSX Source (RMS) survey has identified a sample of ∼1200
massive young stellar objects (MYSOs), compact and ultra-compact HII
regions from a sample of ∼2000 MSX and Two Micron All Sky Survey
(2MASS) colour-selected sources. We have used the 100-m Green Bank
Telescope to search for 22-24GHz water maser and ammonia (1,1), (2,2)
and (3,3) emission towards ∼600 RMS sources located within the
northern Galactic plane. We have identified 308 H2O masers which
corresponds to an overall detection rate of ∼50 per cent. We find no
significant difference in the detection rate for HII regions and MYSOs
which would suggest that the conditions required to produce maser
emission are equally likely in both phases. Comparing the detection
rates as a function of luminosity, we find the H2O detection rate
has a positive dependence on the source luminosity, with the detection
rate increasing with increasing luminosity.
Description:
Parameters for the ammonia (1,1), (2,2) and (3,3) and water maser
transitions detected towards the RMS catalogue of young massive stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 116 600 MSX names, source types, positions, temperatures,
column density and intensities, velocities and
line widths of the three ammonia transitions
for 591 sources
table5.dat 75 308 *MSX names, source types, maser velocity range,
peak maser and ammonia velocities, maser flux
densities and maser and source luminosities
h2o_data/* . 596 FITS files of H2O maser spectra
h2o_plots/* . 616 PS and PNG images of H2O maser spectra
(for 308 sources)
nh3_data/* . 1788 FITS files of NH3 spectra (for 596 sources)
nh3_plots/* . 1192 PS and PNG images of NH3 spectra (for 596 sources)
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Note on table5.dat: including 5 sources not in table2.dat.
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See also:
J/A+A/525/A149 : Red MSX Survey: bolometric fluxes of YSOs (Mottram+, 2010)
J/MNRAS/410/1237 : Red MSX survey (RMS) massive young stars (Urquhart+, 2011)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- MSX MSX source name
19 A1 --- f_MSX [y/n] Hyperfine component fitted
21 I1 --- Type [1/4]? RMS source type (G1)
23- 30 F8.4 deg RAdeg Right ascension (J2000)
32- 39 F8.4 deg DEdeg Declination (J2000)
41- 44 F4.1 K Tex ? Excitation temperature
46- 49 F4.1 K Trot ? Rotation temperature
51- 54 F4.1 K Tkin ? Kinetic temperature
56- 59 F4.1 K NNH3 ? Ammonia column density
61 A1 --- l_Tmb1 Limit flag on NH3 (1,1) main beam temperature
62- 64 F3.1 K Tmb1 ? NH3 (1,1) Main beam temperature
66- 71 F6.2 km/s Vlsr1 ? NH3 (1,1) Velocity
73- 77 F5.2 km/s dVlsr1 ? NH3 (1,1) Line width
79- 82 F4.2 --- tau1 ? NH3 (1,1) Optical depth
84- 86 F3.1 K Tmb2 ? NH3 (2,2) Main beam temperature
88- 93 F6.2 km/s Vlsr2 ? NH3 (2,2) Velocity
95- 98 F4.2 km/s dVlsr2 ? NH3 (2,2) Line width
100-102 F3.1 K Tmb3 ? NH3 (3,3) Main beam temperature
104-109 F6.2 km/s Vlsr3 ? NH3 (3,3) Velocity
111-114 F4.2 km/s dVlsr3 ? NH3 (3,3) Line width
116 A1 --- H2O [y/n] H2O maser detected
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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- 17 A17 --- MSX MSX source name
19 I1 --- Type [1/4] RMS source type (G1)
21- 26 F6.2 Jy rms Root mean square (in Jy/beam)
28- 33 F6.1 km/s Vmin Minimum maser velocity
35- 39 F5.1 km/s Vmax Maximum maser velocity
41- 45 F5.1 km/s Vpeak Peak maser velocity
47- 52 F6.2 km/s VNH3 ? Peak ammonia velocity
54- 58 F5.2 [Jy] log(S) Peak flux density
60- 64 F5.2 [Jy.km/s] log(SdV) Integrated flux density
66- 70 F5.2 [Lsun] log(LH2O) ? Maser luminosity
72- 75 F4.2 [Lsun] log(Ls) ? Source luminosity
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Global notes:
Note (G1): RMS source type as follows:
1 = HII regions
2 = YSOs
3 = HII/YSOs
4 = Young/Old stars
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Acknowledgements:
James Urquhart, jurquhart(at)mpifr-bonn.mpg.de
CSIRO Astronomy and Space Science
(End) Patricia Vannier [CDS] 28-Feb-2012