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CH3OH_I
LIT11 - Search for class I methanol maser emission toward several supernova remnants
Short title
: Litovchenko et al. (2011)
Authors
: Litovchenko, I. D. Alakoz, A. V. Val'Tts, I. E. Larionov, G. M.
Journal
: Astronomy Reports, Volume 55, Issue 11, pp.978-988
Bibcode
:
2011ARep...55..978L
PDF
:
LIT11.pdf
Target type
: SNR
Transitions
: SiO_1-0v0,CH3OH_36(I),CH3OH_44(I),CH3OH_95(I),CH3OH_132(I),CH3OH_6(II)
Abstract
Observations at 44 GHz in the 7
0
-6
1
A
+
methanol line have been carried out on the 20-m telescope of the Onsala Space Observatory (Sweden) in the directions of the poorly studied region G27.4-0.2 and of several supernova remnants, at the coordinates of the OH(1720) maser satellite emission, with the aim of searching for Class I methanol maser emission in these sources. The region G27.4-0.2 has beenmapped, and contains maser sources and two supernova remnants with similar coordinates and radial velocities, which may accelerate condensation of the ambient gas-dust medium. This may play a role in enhancing the probability of methanol formation and maser emission. This is the first detection of 44 GHz maser emission in this source, and this maser is among the 10% of the strongest Class I methanol masers, within the uncertainties in the integrated flux (of a total of 198 currently knownmasers). A 27' × 27' region around the maser has been mapped at 44 GHz in steps of 1'. The 44-GHz emission forms only within the previously known maser region. Further studies in water lines are needed to estimate the influence of shocks from supernovae. No 44-GHz Class I methanol maser emission was detected at the 3 sigma level at the coordinates of the OH(1720) satellite emission in six supernova remnants i.e., the presence of OH(1720) emission is not a sufficient condition for the detection of Class I methanol masers.
Target sources:
RA(J2000) = 18 41 50.90, Dec(J2000) = -05 01 28.3
Comments:
Several supernova remnants
Input tables
: Table 1
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Table (CSV)
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Detection table from Litovchenko et al. (2011)
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individual components
ID
Obs. RA
Obs. Dec
l
b
Source name
Other name
Line
V
peak
FWHM
F
peak
∫F dv
Telescope
Beam
Date
(J2000)
(J2000)
(deg.)
(deg.)
IRAS identification
CH
3
OH (class I)
(km/s)
(km/s)
(Jy)
(Jy*km/s)
(arcsec)
1
18 41 51
-05 01 28.3
27.3686
-0.1637
27.369-0.164
18367-0504
44 GHz (I)
88.745(0.000)
0.685(0.137)
11.952
8.712(1.062)
ONSALA
88
December 2-15, 2009
2
18 41 51
-05 01 28.3
27.3686
-0.1637
27.369-0.164
18367-0504
44 GHz (I)
91.108(0.000)
0.950(0.000)
15.570
15.750(0.774)
ONSALA
88
December 2-15, 2009
3
18 41 51
-05 01 28.3
27.3686
-0.1637
27.369-0.164
18367-0504
44 GHz (I)
93.560(0.116)
2.038(0.167)
32.562
70.632(8.208)
ONSALA
88
December 2-15, 2009
4
18 41 51
-05 01 28.3
27.3686
-0.1637
27.369-0.164
18367-0504
44 GHz (I)
94.466(0.005)
0.767(0.034)
84.366
68.886(6.624)
ONSALA
88
December 2-15, 2009
5
18 41 51
-05 01 28.3
27.3686
-0.1637
27.369-0.164
18367-0504
44 GHz (I)
95.785(0.008)
0.537(0.022)
48.744
27.882(1.350)
ONSALA
88
December 2-15, 2009
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select MAX(met1_data.ra_hms) as ra_hms,MAX(met1_data.dec_dms) as dec_dms,MAX(met1_data.source_name) as source_name,MAX(met1_data.ra) as ra,MAX(met1_data.dec) as dec,MAX(met1_data.l) as l,MAX(met1_data.b) as b,MAX(met1_data.other_name) as other_name,MAX(met1_data.other_desc) as other_desc,BOOL_OR(thermal) as thermal,MAX(met1_data.line) as line,MAX(met1_data.vrange) as vrange,MAX(met1_data.vpeak) as vpeak,MAX(met1_data.peak) as peak,MAX(met1_data.fwhm) as fwhm,MAX(met1_data.int) as int,MAX(met1_data.rms) as rms,MAX(met1_data.units) as units,MAX(met1_data.units_rms) as units_rms,MAX(met1_data.date_txt) as date_txt,MAX(met1_data.telescope_ref) as telescope_ref,MAX(met1_data.beam) as beam,MAX(met1_data.beam_maj) as beam_maj,MAX(met1_data.beam_min) as beam_min,MAX(met1_data.beam_pa) as beam_pa,MAX(met1_data.ref) as ref,MAX(met1_data.list_ref) as list_ref,MAX(met1_data.ascii) as ascii,MAX(met1_data.image) as image,MAX(met1_data.descr) as descr,MAX(met1_data.id) as id,BOOL_OR(mjy_flag) as mjy_flag,BOOL_OR(rms_mjy_flag) as rms_mjy_flag,MAX(met1_data.dist) as dist,MAX(met1_data.date_txt) as date_txt,BOOL_OR(classii) as classii FROM met1_data LEFT JOIN transitions ON met1_data.line=transitions."Line" WHERE ref ilike 'LIT11' AND detected=true AND hide=false GROUP BY ref
select met1_data.ra_hms,met1_data.dec_dms,met1_data.source_name,met1_data.ra,met1_data.dec,met1_data.l,met1_data.b,met1_data.other_name,met1_data.other_desc,met1_data.thermal,met1_data.line,met1_data.vrange,met1_data.vpeak,met1_data.peak,met1_data.fwhm,met1_data.int,met1_data.rms,met1_data.units,met1_data.units_rms,met1_data.date_txt,met1_data.telescope_ref,met1_data.beam,met1_data.beam_maj,met1_data.beam_min,met1_data.beam_pa,met1_data.ref,met1_data.list_ref,met1_data.ascii,met1_data.image,met1_data.descr,met1_data.id,met1_data.mjy_flag,met1_data.rms_mjy_flag,met1_data.dist,met1_data.date_txt,met1_data.classii FROM met1_data LEFT JOIN transitions ON met1_data.line=transitions."Line" WHERE ref ilike 'LIT11' AND detected=true AND hide=false ORDER BY detected DESC,id
