2020ApJ...888...98L


Query : 2020ApJ...888...98L

2020ApJ...888...98L - Astrophys. J., 888, 98-98 (2020/January-2)

Surveying the giant H II regions of the Milky Way with SOFIA. II. M17.

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

Abstract (from CDS):

We present our second set of results from our mid-infrared imaging survey of Milky Way giant H II regions. We used the FORCAST instrument on the Stratospheric Observatory For Infrared Astronomy (SOFIA) to obtain 20 and 37 µm images of the central ∼10' x 10' area of M17. We investigate the small- and large-scale properties of M17 using our data in conjunction with previous multiwavelength observations. The spectral energy distributions of individual compact sources were constructed with Spitzer-IRAC, SOFIA-FORCAST, and Herschel-PACS photometry data and fitted with massive young stellar object (MYSO) models. Seven sources were found to match the criteria for being MYSO candidates, four of which are identified here for the first time, and the stellar mass of the most massive object, UC 1, is determined to be 64 M. We resolve the extended mid-infrared emission from the KW object and suggest that the angle of this extended emission is influenced by outflow. It is shown that IRS 5 decreases in brightness as a function of wavelength from the mid- to far-infrared and has several other indicators that point to it being an intermediate-mass Class II object and not an MYSO. We find that the large-scale appearance of emission in M17 at 20 µm is significantly affected by contamination from the [S III] emission line from the ionized gas of the giant H II region. Finally, a number of potential evolutionary tracers yield a consistent picture suggesting that the southern bar of M17 is likely younger than the northern bar.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

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

Status at CDS : Examining the need for a new acronym.

CDS comments: Sources P1-P4 from 2007ApJ...660..346P are not in SIMBAD.

Simbad objects: 28

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Number of rows : 28
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 NAME M17 EB bub 01 01.6 -00 45           ~ 9 0
2 MSX6C G014.9790-00.6649 MIR 18 20 15.6 -16 14 10           ~ 2 0
3 [BFT2007] 123 Y*O 18 20 19.472 -16 13 29.89           ~ 6 0
4 MSX5C G014.9957-00.6735 MIR 18 20 19.7 -16 13 31           ~ 37 2
5 Cl* NGC 6618 B 358 * 18 20 21.3564651432 -16 09 59.556267072           O8V 12 0
6 Cl* NGC 6618 B 331 * 18 20 21.6385852800 -16 11 17.906098776           B0V 21 0
7 [NCJ2001] Anon 1 IR 18 20 22.7 -16 11 49           ~ 4 0
8 CXOU J182022.8-161148 Y*O 18 20 22.856 -16 11 48.47           ~ 4 0
9 2MASS J18202294-1611528 Y*O 18 20 22.9376838120 -16 11 52.731136644           ~ 4 0
10 NAME M 17 SW SFR 18 20 23.1 -16 11 43           ~ 269 0
11 [NCJ2001] Anon 3 IR 18 20 23.2 -16 11 57           ~ 3 0
12 2MASS J18202432-1613529 Y*O 18 20 24.3275730072 -16 13 52.932251100           ~ 4 0
13 [CW98] IRS 5 IR 18 20 24.6 -16 11 40           ~ 19 1
14 [CNC2015] IRS5A IR 18 20 24.60 -16 11 39.4           ~ 4 0
15 NAME M 17 UC1 HII 18 20 24.82 -16 11 34.9           ~ 56 1
16 2MASS J18202508-1611339 Y*O 18 20 25.0787858376 -16 11 33.926740656           ~ 8 0
17 NAME M 17S HII 18 20 25.1 -16 11 37           ~ 24 1
18 NAME M17-SO1 Y*O 18 20 26.3 -16 12 10           ~ 12 0
19 2MASS J18203452-1606236 NIR 18 20 34.52448 -16 06 23.6988           ~ 1 0
20 M17WF 24 sg? 18 20 34.5978987720 -16 06 28.214721180           ~ 10 0
21 2MASS J18203482-1606262 Y*O 18 20 34.8226803528 -16 06 26.216423784           ~ 4 0
22 NAME M 17 North MoC 18 20 40.19 -16 09 29.0           ~ 47 0
23 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1605 0
24 W 51a HII 19 23 29.3 +14 31 38           ~ 172 0
25 W 51b SFR 19 23 32.8 +14 29 56           ~ 84 0
26 [CHK2004] KW 1 * ~ ~           ~ 3 1
27 [FCM84] M17 S-Bar ? ~ ~           ~ 6 0
28 [CHK2004] KW 2 * ~ ~           ~ 3 1

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