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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
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
Type
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
G359.9846-0.0672
Sgr A
Image
44 GHz (I)
0.13 .. 2.42
..
NRAOVLA
1.3 x 0.5
+CH
3
OH I
+OH
+SiO
MIXED
2010 October 16
+17 45 38.92
-29 00 21
0 μas
0 μas
359.943809
-0.041648
1
Calibrator
Sgr A
44
0.13
+17 45 43.94
-29 00 19.5
75.2988 as
1.4988 as
359.953693
-0.057047
2
C
Sgr A
Calibrator
2.1
+17 45 49.36
-28 58 53.3
156.599 as
87.6988 as
359.984421
-0.061441
3
E
Sgr A
45.2
0.93
+17 45 49.56
-28 59 0.6
159.599 as
80.3988 as
359.983070
-0.063119
4
E
Sgr A
46.5
1.43
+17 45 49.67
-28 58 55.2
161.249 as
85.7988 as
359.984559
-0.062681
5
E
Sgr A
42.7
2.42
+17 45 49.89
-28 59 4.5
164.549 as
76.4988 as
359.982771
-0.064710
6
E
Sgr A
36.9
1.47
+17 45 50.48
-29 00 05
173.399 as
15.9988 as
359.969542
-0.075296
7
D
Sgr A
49.9
0.55
+17 45 50.48
-28 58 48.7
173.399 as
92.2988 as
359.987638
-0.064261
8
E
Sgr A
59.5
0.5
+17 45 50.49
-28 59 7.6
173.549 as
73.3988 as
359.983174
-0.067026
9
E
Sgr A
42.8
0.45
+17 45 50.65
-28 59 8.8
175.949 as
72.1988 as
359.983193
-0.067697
10
E
Sgr A
28
0.74
+17 45 51.41
-28 59 10.2
187.349 as
70.7988 as
359.984303
-0.070264
11
E
Sgr A
44.2
0.45
+17 45 51.55
-28 58 53.7
189.449 as
87.2988 as
359.988482
-0.068314
12
E
Sgr A
46.7
0.51
+17 45 51.62
-28 58 26.5
190.499 as
114.499 as
359.995066
-0.064599
13
E
Sgr A
52.7
0.56
+17 45 51.88
-28 58 52.9
194.399 as
88.0988 as
359.989298
-0.069225
14
E
Sgr A
47.1
2.39
+17 45 52.12
-28 58 55.4
197.999 as
85.5988 as
359.989161
-0.070334
15
E
Sgr A
45.9
0.64
+17 45 52.16
-28 58 22.3
198.599 as
118.699 as
359.997087
-0.065672
16
E
Sgr A
55.4
1.11
+17 45 52.43
-28 58 58.2
202.649 as
82.7988 as
359.989085
-0.071703
17
E
Sgr A
43.7
0.58
+17 45 52.55
-28 58 56.8
204.449 as
84.1988 as
359.989644
-0.071874
18
E
Sgr A
45.7
0.6
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NVSS (1.4GHz)
ATLASGAL 870 um
ATLASGAL 870 um + Planck
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select MAX(met1_data_all.ra_hms) as ra_hms,MAX(met1_data_all.dec_dms) as dec_dms,MAX(met1_data_all.source_name) as source_name,MAX(met1_data_all.ra) as ra,MAX(met1_data_all.dec) as dec,MAX(met1_data_all.l) as l,MAX(met1_data_all.b) as b,MAX(met1_data_all.grp) as grp,MAX(met1_data_all.other_name) as other_name,MAX(met1_data_all.other_desc) as other_desc,BOOL_OR(thermal) as thermal,MAX(met1_data_all.line) as line,MAX(met1_data_all.vrange) as vrange,MAX(met1_data_all.vpeak) as vpeak,MAX(met1_data_all.peak) as peak,MAX(met1_data_all.fwhm) as fwhm,MAX(met1_data_all.int) as int,MAX(met1_data_all.rms) as rms,MAX(met1_data_all.units) as units,MAX(met1_data_all.units_rms) as units_rms,MAX(met1_data_all.date_txt) as date_txt,MAX(met1_data_all.telescope_ref) as telescope_ref,MAX(met1_data_all.telescope_conf) as telescope_conf,MAX(met1_data_all.v_step) as v_step,MAX(met1_data_all.beam) as beam,MAX(met1_data_all.beam_maj) as beam_maj,MAX(met1_data_all.beam_min) as beam_min,MAX(met1_data_all.beam_pa) as beam_pa,MAX(met1_data_all.ref) as ref,MAX(met1_data_all.list_ref) as list_ref,MAX(met1_data_all.ascii) as ascii,MAX(met1_data_all.image) as image,MAX(met1_data_all.descr) as descr,MAX(met1_data_all.id) as id,BOOL_OR(mjy_flag) as mjy_flag,BOOL_OR(rms_mjy_flag) as rms_mjy_flag,MAX(met1_data_all.dist) as dist,MAX(met1_data_all.date_txt) as date_txt,MAX(line_det) as line_det,MAX(type) as type,MAX(simbad_types_cat) as simbad_types_cat FROM met1_data_all LEFT JOIN all_objects_withmet ON met1_data_all.grp=all_objects_withmet.group_name LEFT JOIN object_categories ON all_objects_withmet.group_name = object_categories.group_name_cat AND object_categories.tbl_cat = 'all_objects_withmet' LEFT JOIN transitions ON met1_data_all.line=transitions."Line" WHERE ref ilike 'PIH11' AND detected=true AND hide=false GROUP BY ref
select met1_data_all.ra_hms,met1_data_all.dec_dms,met1_data_all.source_name,met1_data_all.ra,met1_data_all.dec,met1_data_all.l,met1_data_all.b,met1_data_all.grp,met1_data_all.other_name,met1_data_all.other_desc,met1_data_all.thermal,met1_data_all.line,met1_data_all.vrange,met1_data_all.vpeak,met1_data_all.peak,met1_data_all.fwhm,met1_data_all.int,met1_data_all.rms,met1_data_all.units,met1_data_all.units_rms,met1_data_all.date_txt,met1_data_all.telescope_ref,met1_data_all.telescope_conf,met1_data_all.v_step,met1_data_all.beam,met1_data_all.beam_maj,met1_data_all.beam_min,met1_data_all.beam_pa,met1_data_all.ref,met1_data_all.list_ref,met1_data_all.ascii,met1_data_all.image,met1_data_all.descr,met1_data_all.id,met1_data_all.mjy_flag,met1_data_all.rms_mjy_flag,met1_data_all.dist,met1_data_all.date_txt,line_det,type,simbad_types_cat FROM met1_data_all LEFT JOIN all_objects_withmet ON met1_data_all.grp=all_objects_withmet.group_name LEFT JOIN object_categories ON all_objects_withmet.group_name = object_categories.group_name_cat AND object_categories.tbl_cat = 'all_objects_withmet' LEFT JOIN transitions ON met1_data_all.line=transitions."Line" WHERE ref ilike 'PIH11' AND detected=true AND hide=false ORDER BY detected DESC,id
