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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
#
Maser spot
Source name
Image
Line
V
peak
F
peak
∫F dv
Telescope
Beam
Detection
Class
Dist. (parallax)
Date
(J2000)
(J2000)
(mas)
(mas)
(deg.)
(deg.)
CH
3
OH (class I)
(km/s)
(Jy/beam)
(Jy/beam*km/s)
(arcsec)
Yes
/
No
(kpc)
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 mas
0 mas
359.943809
-0.041648
1
Calibrator
Sgr A
44
0.13
+17 45 43.94
-29 00 19.5
75298.8 mas
1498.8 mas
359.953693
-0.057047
2
C
Sgr A
Calibrator
2.1
+17 45 49.36
-28 58 53.3
156599 mas
87698.8 mas
359.984421
-0.061441
3
E
Sgr A
45.2
0.93
+17 45 49.56
-28 59 0.6
159599 mas
80398.8 mas
359.983070
-0.063119
4
E
Sgr A
46.5
1.43
+17 45 49.67
-28 58 55.2
161249 mas
85798.8 mas
359.984559
-0.062681
5
E
Sgr A
42.7
2.42
+17 45 49.89
-28 59 4.5
164549 mas
76498.8 mas
359.982771
-0.064710
6
E
Sgr A
36.9
1.47
+17 45 50.48
-29 00 05
173399 mas
15998.8 mas
359.969542
-0.075296
7
D
Sgr A
49.9
0.55
+17 45 50.48
-28 58 48.7
173399 mas
92298.8 mas
359.987638
-0.064261
8
E
Sgr A
59.5
0.5
+17 45 50.49
-28 59 7.6
173549 mas
73398.8 mas
359.983174
-0.067026
9
E
Sgr A
42.8
0.45
+17 45 50.65
-28 59 8.8
175949 mas
72198.8 mas
359.983193
-0.067697
10
E
Sgr A
28
0.74
+17 45 51.41
-28 59 10.2
187349 mas
70798.8 mas
359.984303
-0.070264
11
E
Sgr A
44.2
0.45
+17 45 51.55
-28 58 53.7
189449 mas
87298.8 mas
359.988482
-0.068314
12
E
Sgr A
46.7
0.51
+17 45 51.62
-28 58 26.5
190499 mas
114499 mas
359.995066
-0.064599
13
E
Sgr A
52.7
0.56
+17 45 51.88
-28 58 52.9
194399 mas
88098.8 mas
359.989298
-0.069225
14
E
Sgr A
47.1
2.39
+17 45 52.12
-28 58 55.4
197999 mas
85598.8 mas
359.989161
-0.070334
15
E
Sgr A
45.9
0.64
+17 45 52.16
-28 58 22.3
198599 mas
118699 mas
359.997087
-0.065672
16
E
Sgr A
55.4
1.11
+17 45 52.43
-28 58 58.2
202649 mas
82798.8 mas
359.989085
-0.071703
17
E
Sgr A
43.7
0.58
+17 45 52.55
-28 58 56.8
204449 mas
84198.8 mas
359.989644
-0.071874
18
E
Sgr A
45.7
0.6
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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.url) as url,MAX(met1_data_all.image) as image,MAX(met1_data_all.image2) as image2,MAX(met1_data_all.image3) as image3,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,1 as dist_parallax,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.url,met1_data_all.image,met1_data_all.image2,met1_data_all.image3,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.dist_parallax,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
