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CH3OH_I
PIH11 - Expanded Very Large Array Detection of 44.1 GHz Class I Methanol Masers in Sagittarius A
Interferometry data
Short title
: Pihlstrom et al. (2011)
Authors
: Pihlstrom, Y. M. Sjouwerman, L. O. Fish, V. L.
Journal
: The Astrophysical Journal Letters, Volume 739, Issue 1, article id. L21,
6
pp. (2011).
Bibcode
:
2011ApJ...739L..21P
PDF
:
PIH11.pdf
Target type
: Galaxy_center
Transitions
: SiO_1-0v0,CH3OH_36(I),CH3OH_44(I),CH3OH_95(I),CH3OH_132(I),CH3OH_6(II)
Abstract
We report on the detection of 44 GHz Class I methanol (CH
3
OH) maser emission in the Sagittarius A (Sgr A) complex with the Expanded Very Large Array (EVLA). These EVLA observations show that the Sgr A complex harbors at least four different tracers of shocked regions in the radio regime. The 44 GHz masers correlate with the positions and velocities of previously detected 36 GHz CH
3
OH masers, but less with 1720 MHz OH masers. Our detections agree with theoretical predictions that the densities and temperatures conducive for 1720 MHz OH masers may also produce 36 and 44 GHz CH
3
OH maser emission. However, many 44 GHz masers do not overlap with 36 GHz methanol masers, suggesting that 44 GHz masers also arise in regions too hot and too dense for 36 GHz masers to form. This agrees with the non-detection of 1720 MHz OH masers in the same area, which are thought to be excited under even cooler and less dense conditions. We speculate that the geometry of the 36 GHz masers outlines the current location of a shock front. eprintid:
arXiv:1105.4377
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Table (CSV)
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Detection table from Pihlstrom et al. (2011)
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individual components
ID
Obs. RA
Obs. Dec
RA offset
Dec offset
l
b
Group id
#
Location
Source name
Image
Line
V
peak
F
peak
∫F dv
Telescope
Beam
Detection
Date
(J2000)
(J2000)
(arcsec)
(arcsec)
(deg.)
(deg.)
CH
3
OH (class I)
(km/s)
(Jy/beam)
(Jy/beam*km/s)
(arcsec)
Yes
/
No
1
+17 45 38.92
-29 00 21
359.943809
-0.041648
G359.984-0.068
Sgr A
Image
44 GHz (I)
0.13 .. 2.42
..
NRAOVLA
1.3 x 0.5
+CH
3
OH I
+CH
3
OH II
+OH
+SiO
2010 October 16
+17 45 38.92
-29 00 21
0 mas
0 mas
359.943809
-0.041648
1
Calibrator
Sgr A
44
0.13
+17 45 43.94
-29 00 19.5
75.2988
1.4988
359.953693
-0.057047
2
C
Sgr A
Calibrator
2.1
+17 45 49.36
-28 58 53.3
156.599
87.6988
359.984421
-0.061441
3
E
Sgr A
45.2
0.93
+17 45 49.56
-28 59 0.6
159.599
80.3988
359.983070
-0.063119
4
E
Sgr A
46.5
1.43
+17 45 49.67
-28 58 55.2
161.249
85.7988
359.984559
-0.062681
5
E
Sgr A
42.7
2.42
+17 45 49.89
-28 59 4.5
164.549
76.4988
359.982771
-0.064710
6
E
Sgr A
36.9
1.47
+17 45 50.48
-29 00 05
173.399
15.9988
359.969542
-0.075296
7
D
Sgr A
49.9
0.55
+17 45 50.48
-28 58 48.7
173.399
92.2988
359.987638
-0.064261
8
E
Sgr A
59.5
0.5
+17 45 50.49
-28 59 7.6
173.549
73.3988
359.983174
-0.067026
9
E
Sgr A
42.8
0.45
+17 45 50.65
-28 59 8.8
175.949
72.1988
359.983193
-0.067697
10
E
Sgr A
28
0.74
+17 45 51.41
-28 59 10.2
187.349
70.7988
359.984303
-0.070264
11
E
Sgr A
44.2
0.45
+17 45 51.55
-28 58 53.7
189.449
87.2988
359.988482
-0.068314
12
E
Sgr A
46.7
0.51
+17 45 51.62
-28 58 26.5
190.499
114.499
359.995066
-0.064599
13
E
Sgr A
52.7
0.56
+17 45 51.88
-28 58 52.9
194.399
88.0988
359.989298
-0.069225
14
E
Sgr A
47.1
2.39
+17 45 52.12
-28 58 55.4
197.999
85.5988
359.989161
-0.070334
15
E
Sgr A
45.9
0.64
+17 45 52.16
-28 58 22.3
198.599
118.699
359.997087
-0.065672
16
E
Sgr A
55.4
1.11
+17 45 52.43
-28 58 58.2
202.649
82.7988
359.989085
-0.071703
17
E
Sgr A
43.7
0.58
+17 45 52.55
-28 58 56.8
204.449
84.1988
359.989644
-0.071874
18
E
Sgr A
45.7
0.6
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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.grp) as grp,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,MAX(line_det) as line_det FROM met1_data LEFT JOIN all_objects_withmet ON met1_data.grp=all_objects_withmet.group_name LEFT JOIN transitions ON met1_data.line=transitions."Line" WHERE ref ilike 'PIH11' 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.grp,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,line_det FROM met1_data LEFT JOIN all_objects_withmet ON met1_data.grp=all_objects_withmet.group_name LEFT JOIN transitions ON met1_data.line=transitions."Line" WHERE ref ilike 'PIH11' AND detected=true AND hide=false ORDER BY detected DESC,id
