2021ApJS..256....7B

Query : 2021ApJS..256....7B

2021ApJS..256....7B - Astrophys. J., Suppl. Ser., 256, 7-7 (2021/September-0)

Search for collisionally pumped 1720 MHz OH masers in star-forming regions: a VLA survey of 18 cm OH masers toward 80 class I methanol masers.

BAYANDINA O.S., VAL'TTS I.E., KURTZ S.E. and SHAKHVOROSTOVA N.N.

Abstract (from CDS):

Class I methanol masers (cIMMs) and 1720 MHz OH masers are believed to arise from a common collisional pumping mechanism, and both trace shocked gas regions in supernova remnants (SNRs). However, their coexistence in star formation regions (SFRs) and their association with a front of bipolar outflow (a source of shock-stimulated collisional pumping) remain unclear. To search for collisionally pumped OH(1720) masers, we conducted a Very Large Array survey of the 18 cm OH masers and continuum emission toward a sample of 80 SFRs associated with 44 GHz cIMMs. Main-line OH maser emission was detected in 50% of the sample, and OH(1720) maser emission was detected in 20%. Continuum emission was detected in 28% of sources. A catalog of the detected OH masers is presented. Individual OH masers are found in close proximity, and the regions of masers of different transitions are often overlapping. A typical linear projected offset between the OH(1720) and OH(1665) masers is ∼0.04 pc. A remarkable number of ∼81% of the OH(1720) masers are associated with the continuum emission. The median separation between the targeted 44 GHz cIMMs and OH(1720) masers is ∼0.2 pc, which is similar to reported distances between cIMMs and H II regions. The observed properties of the detected OH(1720) masers are different from those in SNRs and indicate that a nonlocal line overlap mechanism is responsible for their excitation. Thus, while both 44 GHz cIMMs and OH(1720) masers trace shocked gas in SNRs, physical conditions favorable for excitation of cIMMs, but not OH(1720) masers, are present in SFRs.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Star-forming regions - Hydroxyl masers - Astrophysical masers - Very Large Array - Shocks - Surveys

VizieR on-line data: <Available at CDS (J/ApJS/256/7): table1.dat table2.dat table3.dat table4.dat>

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 80

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Number of rows : 80
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 LBN 119.83-06.05 MoC 00 28 43.5075 +56 41 56.868           ~ 72 0
2 IRAS 00420+5530 Y*? 00 44 57.31 +55 47 18.1           ~ 61 0
3 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2924 2
4 LDN 1359 DNe 02 25.8 +62 04           ~ 5 0
5 JCMTSE J022553.6+620412 Mas 02 25 53.6 +62 04 11           ~ 15 0
6 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 1064 2
7 NAME HH 7-11 FIR 03 29 03.9 +31 16 06           ~ 357 0
8 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 770 1
9 IRAS 05168+3634 mul 05 20 16.2 +36 37 21           ~ 48 0
10 HH 190 HH 05 30 45.56 +33 47 53.0           ~ 5 0
11 GAL 174.20-00.08 Cld 05 30 45.9 +33 47 56           ~ 210 2
12 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2421 1
13 [TSO2008] 18 mm 05 35 26.0 -05 05 42           ~ 47 1
14 OMC 2 MoC 05 35 27 -05 10.1           ~ 475 1
15 NAME Ori A MoC 05 38 -07.1           ~ 3187 0
16 SH 2-231 Y*O 05 39 13.2 +35 45 48           ~ 135 0
17 RNO 49 ISM 05 39.3 +35 47           ~ 3 0
18 SH 2-235 B HII 05 40 52.366 +35 41 29.43   17       ~ 180 1
19 RNO 52 ISM 05 40.9 +35 42           ~ 3 0
20 SH 2-235 HII 05 41.1 +35 50           ~ 236 0
21 LDN 1630 DNe 05 45.5 -00 59           ~ 392 0
22 NAME HH 25MMS Y*O 05 46 07.8 -00 13 41           ~ 59 0
23 NGC 2071 RNe 05 47 10 +00 18.0           ~ 661 1
24 RAFGL 6366S HII 06 08 41.0 +21 31 01           ~ 95 0
25 SH 2-257 HII 06 12 43.57 +17 59 33.1           ~ 135 1
26 IC 2162 HII 06 13 04.1 +17 58 44           ~ 372 2
27 RAFGL 5186 HII 06 13 16.34 +15 22 42.2           ~ 29 1
28 NGC 2264 OpC 06 40 53.7 +09 52 32           ~ 1876 0
29 OHIO N 001 Rad 12 03 08.09 +07 15 30.1           ~ 23 1
30 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
31 GAL 353.41-00.36 HII 17 30 26.2 -34 41 45           ~ 54 1
32 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
33 RCW 142 HII 17 50 15.3 -28 54 03           ~ 64 0
34 RAFGL 2046 HII 18 00 32.1 -24 04 03           ~ 380 0
35 M 8 OpC 18 03 37 -24 23.2           ~ 644 1
36 NGC 6530 OpC 18 04 31 -24 21.5           ~ 443 0
37 RAFGL 2059 Y*O 18 04 53.1586569336 -24 26 41.642012796 19.905 21.910 18.914   14.078 ~ 146 0
38 LBN 018.45+01.87 HII 18 17 52.5 -11 40 58           ~ 60 1
39 RAFGL 7009S HII 18 34 20.911 -05 59 42.23           ~ 231 0
40 SNR G023.3-00.3 SNR 18 34 51.80 -08 44 38.2           ~ 240 0
41 GRS G024.80 +00.10 SFR 18 38 14.8 -06 47 39           ~ 120 0
42 Mol 65 Rad 18 38 40.3 -05 35 06           ~ 4 0
43 W 43 SFR 18 47 32 -01 56.5           ~ 604 0
44 W 43s Rad 18 47 41.68 -02 00 24.3           ~ 30 0
45 Mol 73 Rad 18 51 24.8 +00 04 19           ~ 2 0
46 RAFGL 5542 Y*O 18 53 37.88832 +01 50 30.5844           ~ 78 0
47 IRAS 18517+0437 SFR 18 54 13.8 +04 41 32           ~ 89 0
48 [ERG2015] 6375 smm 18 55 16.778 +03 05 07.47           ~ 30 0
49 SH 2-76 E SFR 18 56 12 +07 53.4           ~ 35 0
50 IRAS 18565+0349 Rad 18 59 03.4 +03 53 22           ~ 16 0
51 IRAS 19043+0726 Rad 19 06 47.7 +07 31 38           ~ 16 0
52 W 49n HII 19 10 13.2 +09 06 12           ~ 497 3
53 IRAS 19088+0902 Rad 19 11 15.9 +09 07 27           ~ 22 0
54 W 51e1 HII 19 23 43.785 +14 30 26.11           ~ 141 0
55 NAME W 51 Main reg 19 23 43.8 +14 30 37           ~ 147 0
56 W 51e2 Ma* 19 23 43.906 +14 30 34.48           ~ 222 0
57 Mol 110 Rad 19 40 59.4 +24 04 39           ~ 10 0
58 Mol 114 Rad 20 07 06.7 +27 28 53           ~ 7 0
59 Mol 116 Rad 20 08 09.8 +35 59 20           ~ 7 0
60 IRAS 20126+4104 Y*O 20 14 25.8816769656 +41 13 36.879427236           B2.5-B0.5 469 0
61 EM* LkHA 225 Ae* 20 20 30.5955531672 +41 21 26.370826704   18.2 19.17     A4:Ve 88 0
62 HH 425 HH 20 20 31.683 +41 21 39.54           ~ 1 0
63 LBN 077.61+01.59 HII 20 20 39.3 +39 37 52           ~ 80 0
64 OHIO N 002 Rad 20 21 +37.5           ~ 13 1
65 NAME Cyg X FIR 33 Y*O 20 38 35.9 +42 37 22           B1.5 423 1
66 NAME DR 21(OH) M Rad 20 39 01 +42 29.8           ~ 91 0
67 W 75(OH) Rad 20 39 01.01 +42 22 49.9           ~ 39 0
68 DR 21 (OH) cor 20 39 01.01 +42 22 50.2           ~ 427 0
69 NAME LDN 1157-mm Y*O 20 39 06.2 +68 02 15           ~ 204 0
70 [DE95] LDN 1157 B1 out 20 39 11 +68 01.3           ~ 288 0
71 IRAS 21307+5049 Y*O 21 32 30.59280 +51 02 16.0368           ~ 49 0
72 NAME IC 1396 North CGb 21 40 42.6537 +58 16 01.882           ~ 193 1
73 NGC 7129 OpC 21 43 01.1 +66 07 04     11.5     ~ 271 0
74 NAME SH 2-140 IRS 1 Y*O 22 19 18.277 +63 18 45.82           ~ 201 0
75 LDN 1204 DNe 22 26.7 +63 15           ~ 88 1
76 IRAS 22506+5944 Y*O 22 52 38.09760 +60 01 01.1928           ~ 60 0
77 HH 377 HH 23 03 +61.7           ~ 23 2
78 NGC 7538 OpC 23 13 37 +61 30.0           ~ 920 1
79 [WBN74] NGC 7538 IRS 1 Y*O 23 13 45.318 +61 28 11.69           ~ 433 3
80 Mol 160 Rad 23 40 54.5 +61 10 28           ~ 121 0

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