J/MNRAS/359/1498 Class I and class II methanol masers (Ellingsen+, 2005)
The relationship between class I and class II methanol masers.
Ellingsen S.P.
<Mon. Not. R. Astron. Soc., 359, 1498-1516 (2005)>
=2005MNRAS.359.1498E 2005MNRAS.359.1498E
ADC_Keywords: Masers ; Radio sources ; Radio lines
Keywords: masers - ISM: molecules - radio lines: general - stars: formation
Abstract:
The Australia Telescope National Facility Mopra millimetre telescope
has been used to search for 95.1-GHz class I methanol masers towards
62 6.6-GHz class II methanol masers. A total of 26 95.1-GHz masers
were detected, 18 of these being new discoveries. Combining the
results of this search with observations reported in the literature, a
near complete sample of 66 6.6-GHz class II methanol masers has been
searched in the 95.1-GHz transition, with detections towards 38 per
cent (25 detections; not all of the sources studied in this paper
qualify for the complete sample, and some of the sources in the sample
were not observed in the present observations).
Description:
The observations were made between 1998 July 1217 using the Australia
Telescope National Facility (ATNF) 22-m millimetre antenna at Mopra.
The sample of 6.6-GHz methanol maser sites searched for 95.1-GHz maser
emission was drawn from Ellingsen et al. (1996MNRAS.280..378E 1996MNRAS.280..378E) and
Ellingsen (1996, PhD thesis, Univ. Tasmania) and included all sources
detected in the regions with Galactic longitude l=25-30°,
282-286°, 291-296°, 325-335°.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 72 73 Class II methanol maser sites detected in the
95.1-GHz class I transition (26 sources)
table2.dat 55 33 Class II methanol maser sites not detected in the
95.1-GHz class I transition (33 sources)
table3.dat 63 86 Comparison of peak flux density and velocity range of
6.6-GHz class II and 95.1-GHz class I methanol masers
table4.dat 34 86 Associations of the class II methanol masers with
other maser species and MSX 21-um flux
table5.dat 75 86 Associations of the class II methanol masers
with IRAS, MSX and 2MASS point sources.
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See also:
J/A+A/432/737 : General Catalogue of 6.7GHz Methanol Masers (Pestalozzi+, 2005)
J/AZh/72/22 : A 95 GHz Survey of Methanol Masers (Valtts+, 1995)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name Source name, based on galactic position
15 A1 ---- n_Name [a] Note on Name (G1)
17- 18 I2 h RAh Right ascension (J2000)
20- 21 I2 min RAm Right ascension (J2000)
23- 28 F6.3 s RAs Right ascension (J2000)
30 A1 --- DE- Declination sign (J2000)
31- 32 I2 deg DEd Declination (J2000)
34- 35 I2 arcmin DEm Declination (J2000)
37- 41 F5.2 arcsec DEs Declination (J2000)
43- 47 F5.1 Jy Fpeak Peak flux density at 95.1GHz (2)
49- 51 F3.1 Jy e_Fpeak rms uncertainty on Fpeak (3)
53- 58 F6.1 km/s Vel Velocity (2)
60- 63 F4.2 km/s e_Vel rms uncertainty on Vel (3)
65- 67 F3.1 km/s FWHM Full width at half maximum (2)
69- 72 F4.2 km/s e_FWHM rms uncertainty on FWHM (3)
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Note (2): The Hanning smoothed spectra have been fitted with one or more
Gaussian profiles and the fitted parameters are listed.
Note (3): uncertainty reported by the fitting procedure.
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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- 13 A13 --- Name Source name, based on galactic position
15 A1 ---- n_Name [ab] Note on Name (G1)
17- 18 I2 h RAh Right ascension (J2000)
20- 21 I2 min RAm Right ascension (J2000)
23- 28 F6.3 s RAs Right ascension (J2000)
30 A1 --- DE- Declination sign (J2000)
31- 32 I2 deg DEd Declination (J2000)
34- 35 I2 arcmin DEm Declination (J2000)
37- 41 F5.2 arcsec DEs Declination (J2000)
43- 46 I4 km/s Vell Lower value of velocity range
48- 51 I4 km/s Velu Upper value of Velocity range
53- 55 F3.1 Jy 3sigma 3σ rms noise level as measured in the
Hanning smoothed spectra
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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- 13 A13 --- Name Source name, based on galactic position
15 A1 --- n_Name [a] Note on Name (G1)
17- 21 F5.1 Jy Speak1 ? Density of peak flux for
95.1-GHz class I methanol masers
23- 27 F5.1 km/s Vel1 ? Velocity of peak flux for
95.1-GHz class I methanol masers
29- 31 I3 km/s Vell1 ? Velocity range of peak flux for
95.1-GHz class I methanol masers
34- 36 I3 km/s Velu1 ? Velocity range of peak flux for
95.1-GHz class I methanol masers
38- 40 A3 --- r_Speak1 Reference for 95.1-GHz class I methanol
masers values (1)
42- 44 I3 Jy Speak2 Density of peak flux for
6.6-GHz class I methanol masers
46- 51 F6.1 km/s Vel2 Velocity of peak flux for
6.6-GHz class I methanol masers
53- 56 I4 km/s Vell2 ? Velocity range of peak flux for
6.6-GHz class I methanol masers
58- 61 I4 km/s Velu2 ? Velocity range of peak flux for
6.6-GHz class I methanol masers
63 A1 --- r_Speak2 Reference for 6.6-GHz class I methanol
masers values (1)
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Note (1): References from which the 6.6- and 95.1-GHz information was obtained
as follows:
* = this paper
2 = Val'tts et al. (2000MNRAS.317..315V 2000MNRAS.317..315V)
3 = Ellingsen (1996, PhD thesis, Univ. Tasmania)
4 = Ellingsen et al. (1996MNRAS.280..378E 1996MNRAS.280..378E)
5 = Caswell (1996MNRAS.279...79C 1996MNRAS.279...79C).
For a comprehensive list of references for each 6.6-GHz masers,
see Pestalozzi et al. (2005, Cat. J/A+A/432/737).
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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- 13 A13 --- Name Source name, based on galactic position
15 A1 --- n_Name [a] Note on Name (G1)
18 A1 --- A1665MHz [Y/N] Association with 1665MHz OH maser
20 I1 --- r_A1665MHz Reference for 1665MHz association (1)
22 A1 --- A22GHz [Y/N] Association with 22GHz H2O maser
24 I1 --- r_A22GHz Reference for 22GHz association (1)
27 A1 --- l_FMSX Limit flag on FMSX
28- 34 F7.2 uW/m2/sr FMSX MSX 21um flux (2)
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Note (1): References as follows:
2 = Caswell & Haynes (1987AuJPh..40..215C 1987AuJPh..40..215C)
3 = Caswell (1998MNRAS.297..215C 1998MNRAS.297..215C)
4 = Caswell & Haynes (1983AuJPh..36..417C 1983AuJPh..36..417C)
5 = Caswell et al. (1995MNRAS.272...96C 1995MNRAS.272...96C)
6 = Hanslow (1997, Honours thesis, University of Tasmania)
Note (2): The MSX flux is measured directly from the images; for non-detections
the flux density at the maser location is given as an upper limit.
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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- 13 A13 --- Name Source name, based on galactic position
15 A1 ---- n_Name [a] Note on Name (G1)
17- 26 A10 --- IRAS IRAS name (Cat. II/125)
28- 31 F4.1 arcsec Diras ? Distance from IRAS source
33- 49 A17 --- MSX MSX name (see Cat. V/114)
51- 54 F4.1 arcsec Dmsx ? Distance from MSX source
56- 71 A16 --- 2MASS 2MASS name (see Cat. II/246)
73- 75 F3.1 arcsec D2mass ? Distance from 2MASS source
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Global notes:
Note (G1): Note as follows:
a = sources not within the statistically complete sample of
6.6-GHz methanol masers
b = emission detected towards this source, but it appears to be
a sidelobe response to 29.907-0.040
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 27-Feb-2006