2023ApJ...949...82D

Query : 2023ApJ...949...82D

2023ApJ...949...82D - Astrophys. J., 949, 82 (2023/June-1)

Surveying the Giant H II Regions of the Milky Way with SOFIA: V. DR7 and K3-50.

DE BUIZER J.M., LIM W., RADOMSKI J.T. and LIU M.

Abstract (from CDS):

We present our fifth set of results from our mid-infrared imaging survey of Milky Way Giant H II (GH II) regions with our detailed analysis of DR7 and K3-50. We obtained 20/25 and 37 μm imaging maps of both regions using the FORCAST instrument on the Stratospheric Observatory For Infrared Astronomy. We investigate the multiscale properties of DR7 and K3-50 using our data in conjunction with previous multiwavelength observations. Near- to far-infrared spectral energy distributions of individual compact infrared sources were constructed and fitted with massive young stellar object (MYSO) models. We find eight out of the ten (80%) compact sources in K3-50 and three out of the four (75%) sources in DR7 are likely to be MYSOs. We derived luminosity-to-mass ratios of the extended radio subregions of DR7 and K3-50 to estimate their relative ages. The large spread in evolutionary state for the subregions in K3-50 likely indicates that the star-forming complex has undergone multiple star-forming events separated more widely in time, whereas the smaller spread in DR7 likely indicates the star formation subregions are more co-eval. DR7 and K3-50 have Lyman continuum photon rates just above the formal threshold criterion for being categorized as a GH II region (1050 photons s–1) but with large enough errors that this classification is uncertain. By measuring other observational characteristics in the infrared, we find that K3-50 has properties more akin to previous bona fide GH II regions we have studied, whereas DR7 has values more like those of the non-GH II regions we have previously studied.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): H II regions - Compact H II region - Star formation - Star forming regions - Massive stars - Interstellar medium - Protostars - Infrared astronomy - Infrared sources

Nomenclature: Table 1: [DLR2023] DR7 N N=6. Table 2: [DLR2023] K3-50 N N=8. Table 2: [DLR2023] K3-50 G = [W69] AN (No. G) added.

Simbad objects: 55

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Number of rows : 55
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 NAME Per Arm PoG 03 30 +45.0           ~ 1672 0
2 * tet01 Ori C SB* 05 35 16.4662967280 -05 23 22.921811880 4.20 5.15 5.13 4.91 4.73 O7Vp 1479 1
3 NAME Ori A MoC 05 38 -07.1           ~ 3187 0
4 GUM 29 HII 10 24 14.6 -57 46 58           ~ 219 0
5 NGC 3603 OpC 11 14 57.9 -61 14 32           ~ 1136 1
6 NAME Sgr D MoC 17 48 41.75 -28 01 45.0           ~ 137 1
7 NAME M 17S HII 18 20 25.1 -16 11 37           ~ 25 1
8 NAME M 17 North MoC 18 20 40.19 -16 09 29.0           ~ 50 0
9 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1700 0
10 GRS G024.80 +00.10 SFR 18 38 14.8 -06 47 39           ~ 120 0
11 W 49a SFR 19 10 15.7 +09 06 05           ~ 325 2
12 W 49 SFR 19 10 20 +09 07.7           ~ 601 1
13 [M72b] G49.4a PoC 19 23 04.0 +14 27 59           ~ 5 0
14 GAL 049.4-00.3 Cld 19 23 14 +14 26.9           ~ 25 0
15 [M72b] G49.4c PoC 19 23 19.0 +14 29 20           ~ 5 0
16 W 51a HII 19 23 29.3 +14 31 38           ~ 186 0
17 GAL 049.5-00.4 MoC 19 23 44 +14 30.7           ~ 27 0
18 MR 97 WR* 20 00 19.1223016752 +33 15 51.099973956 12.93 13.050 12.080     WN7h 84 0
19 LBN 070.13+01.71 HII 20 00 53.25 +33 29 26.0   13.79 12.86     ~ 57 2
20 GAL 070.33+01.63 Rad 20 01 33.0 +33 35 36           ~ 4 0
21 [DLR2023] K3-50 1 MIR 20 01 41.80 +33 32 39.7           ~ 1 0
22 CTB 82 Mas 20 01.7 +33 33           ~ 40 0
23 [DLR2023] K3-50 2 Y*? 20 01 42.70 +33 32 27.8           ~ 1 0
24 [DLR2023] K3-50 3 Y*? 20 01 43.00 +33 32 54.5           ~ 1 0
25 [DLR2023] K3-50 4 Y*? 20 01 43.80 +33 33 14.8           ~ 1 0
26 GAL 070.31+01.66 Rad 20 01 44.0 +33 35 42           ~ 5 0
27 LBN 070.24+01.53 HII 20 01 44.7 +33 31 14           ~ 40 1
28 [DLR2023] K3-50 6 MIR 20 01 44.80 +33 32 02.6           ~ 1 0
29 [DLR2023] K3-50 5 Y*? 20 01 44.80 +33 32 02.6           ~ 1 0
30 [DLR2023] K3-50 7 Y*? 20 01 45.10 +33 33 06.6           ~ 1 0
31 NAME K 3-50A HII 20 01 45.6 +33 32 42           ~ 85 0
32 W 58a HII 20 01 45.8 +33 32 43           ~ 294 4
33 [DLR2023] K3-50 8 MIR 20 01 47.50 +33 32 04.6           ~ 1 0
34 NGC 6857 HII 20 01 47.71 +33 31 33.4           ~ 88 3
35 [DLR2023] K3-50 G MIR 20 01 52.00 +33 32 23.8           ~ 1 0
36 OH 070.33+01.59 Y*? 20 01 54.03 +33 34 14.2           ~ 35 0
37 [W69] C Rad 20 01 54.2 +33 34 15           ~ 18 0
38 W 58c2 Y*? 20 01 55.21 +33 34 17.5           ~ 10 0
39 [DLR2023] DR7 1 MIR 20 28 02.30 +40 52 14.8           ~ 1 0
40 [DLR2023] DR7 2 MIR 20 28 04.60 +40 52 34.0           ~ 1 0
41 [DLR2023] DR7 4 Y*? 20 28 05.10 +40 52 21.4           ~ 1 0
42 [DLR2023] DR7 3 MIR 20 28 05.20 +40 51 17.3           ~ 1 0
43 [OSC86] DR7 A Rad 20 28 08.80 +40 51 53.9           ~ 1 0
44 [OSC86] DR7 C Rad 20 28 09.40 +40 52 38.5           ~ 1 0
45 DR 7 HII 20 28 09.5 +40 51 43           ~ 49 0
46 MSX6C G079.3202+01.3131 Y*O 20 28 10.2 +40 53 38           ~ 6 1
47 [KCW94] 079.320+01.313 Rad 20 28 10.235 +40 53 37.96           ~ 5 0
48 [KCW94] 079.321+01.291 Rad 20 28 16.045 +40 52 54.78           ~ 2 0
49 [OSC86] DR7 B Rad 20 28 16.50 +40 52 57.3           ~ 1 0
50 [DLR2023] DR7 6 Y*? 20 28 18.30 +40 52 58.4           ~ 1 0
51 [KMH2014] J202820.47+405259.34 Y*O 20 28 20.470 +40 52 59.34           ~ 2 0
52 NAME Cyg X Cld 20 30 04.7973633 +40 51 36.002197           ~ 962 1
53 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 1023 0
54 NAME Outer Arm PoG 21 48 +69.4           ~ 370 0
55 NAME Local Arm reg ~ ~           ~ 649 0

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