J/A+A/410/597 Warm dust near methanol masers (Walsh+, 2003)
Observations of warm dust near methanol masers.
Walsh A.J., Macdonald G.H., Alvey N.D.S., Burton M.G., Lee J.-K.
<Astron. Astrophys., 410, 597-610 (2003)>
=2003A&A...410..597W 2003A&A...410..597W
ADC_Keywords: Masers ; Infrared sources ; Radial velocities
Keywords: stars: formation - ISM: dust, extinction - submillimeter -
infrared: ISM
Abstract:
Continuum emission at 450 and 850µm from warm dust has been mapped
in the fields of 71 methanol masers. Within these fields lie 30
centimetre-wave radio continuum sources and an additional 13 methanol
maser sites. Sub-mm emission is detected at all but one of the maser
sites, confirming the association of methanol maser emission with
deeply embedded objects. Measured bolometric luminosities confirm that
methanol maser emission is an excellent signpost of high-mass star
formation. Examples of nearby isolated maserless dust cores may be
harbouring massive protostars at an earlier evolutionary stage.
Description:
Observations were made during the period 1-4 April 2000 using SCUBA on
the JCMT simultaneously at 450um and 850um.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 62 101 Sub-mm source characteristics
table2.dat 89 54 Comparison of molecular gas and methanol maser
kinematics.
refs.dat 68 25 References
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See also:
J/AZh/72/22 : A 95 GHz Survey of Methanol Masers (Valtts+, 1995)
J/A+AS/110/81 : Methanol masers towards IRAS sources (van der Walt+ 1995)
J/A+AS/134/115 : Medicina 6.7GHz methanol masers survey (Slysh+ 1999)
J/A+AS/143/269 : 6.7GHz methanol maser emission survey (Szymczak+, 2000)
J/A+A/413/233 : 12.2 GHz methanol survey (Blaszkiewicz+, 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- [WMA2003] Field name (G1) (1)
14- 15 I2 h RAh Right ascension (J2000)
17- 18 I2 min RAm Right ascension (J2000)
20- 23 F4.1 s RAs Right ascension (J2000)
25 A1 --- DE- Declination sign (J2000)
26- 27 I2 deg DEd Declination (J2000)
29- 30 I2 arcmin DEm Declination (J2000)
32- 33 I2 arcsec DEs Declination (J2000)
35- 36 A2 --- l_Sp850um [≥ ] Limit flag on Sp850um (2)
37- 41 F5.2 Jy Sp850um Peak flux density at 850um (in Jy/beam)
43- 46 F4.1 Jy Si850um ? Integrated flux at 850um over an aperture
centred on the source coordinates
48- 49 A2 --- l_Sp450um [<≥ ] Limit flag on Sp450um (2)
50- 54 F5.1 Jy Sp450um Peak flux density at 450um (in Jy/beam)
56- 59 I4 Jy Si450um ? Integrated flux at 450um
61- 62 A2 --- Assoc [mr ] Source is associated with a methanol
maser site (m), a radio continuum source (r)
or both (mr).
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Note (1): G16.59-0.15 corrected into G16.59-0.05
Note (2): Non-detection: the value quoted is the 3sigma upper limit.
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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- 12 A12 --- [WMA2003] Field name (G1)
14- 28 A15 --- MolTrans Name of the associated molecular transition
to the sub-mm source
29- 34 F6.1 km/s RV ? Radial velocity of the associated
molecular transition
36- 37 I2 --- r_RV ? Reference for radial velocity,
in refs.dat file
39- 43 F5.1 km/s RVCH3OH ? Methanol radial velocity range
(lower limit) (2)
44 A1 --- --- [-]
45- 49 F5.1 km/s RVCH3OHu ? Methanol radial velocity range
(upper limit) (2)
51- 55 F5.2 kpc Dist ? Adopted distance from the literature
56- 57 A2 --- n_Dist [* ] Note on Dist (3)
58 A1 --- --- [/]
59- 62 F4.1 kpc Dist2 ? Second value for the distance
64- 65 I2 --- r_Dist ? Distance reference, in refs.dat file
66 A1 --- --- [/]
67- 68 I2 --- r_Dist2 ? Second distance reference,
in refs.dat file
71- 76 F6.2 10+4solLum Lbol ? Bolometric luminosity
77- 86 A10 --- n_Lbol Note on Lbol
88- 89 I2 --- r_Lbol ? Reference for Lbol, in refs.dat file
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Note (2): Methanol radial velocity range over which Walsh et al. (1998, Cat.
J/MNRAS/301/640) detected methanol maser emission. One number is
given for maser sites where only one maser spot was detected.
Note (3): Those distances marked with an asterisk (*) were derived assuming
10kpc to the Galactic centre; all others assume it is 8.5kpc away.
The distance to the source marked with a double-asterisk (**) was not
determined using the kinematics of a Galactic rotation curve.
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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 --- Ref Reference number
4- 22 A19 --- BibCode BibCode
24- 44 A21 --- Aut Author's name
48- 68 A21 --- Com Comments
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Global notes:
Note (G1): Suffixes of A, B and C are added to the field name for multiple
sources in each field, with the brightest named first.
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History:
From electronic version of the journal
(End) Patricia Bauer [CDS] 02-Dec-2003