2016ApJ...825...54B


Query : 2016ApJ...825...54B

2016ApJ...825...54B - Astrophys. J., 825, 54-54 (2016/July-1)

A mid-infrared view of the high mass star formation region W51A.

BARBOSA C.L., BLUM R.D., DAMINELI A., CONTI P.S. and GUSMAO D.M.

Abstract (from CDS):

In this paper we present the results of a mid-infrared study of G49.5-0.4, or W51A, part of the massive starbirth complex W51. Combining public data from the Spitzer IRAC camera, and Gemini mid-infrared camera T-ReCS at 7.73, 9.69, 12.33, and 24.56 µm, with a spatial resolution of ∼0.''5, we have identified the mid-infrared counterparts of eight ultracompact H ii regions, showing that two radio sources are deeply embedded in molecular clouds and another is a cloud of ionized gas. From the T-ReCS data we have unveiled the central core of the W51 region, revealing massive young stellar candidates. We modeled the spectral energy distribution of the detected sources. The results suggest that the embedded objects are sources with spectral types ranging from B3 to O5, but the majority of the fits indicate stellar objects with B1 spectral types. We also present an extinction map of IRS 2, showing that a region with lower extinction corresponds to the region where a proposed jet of gas has impacted the foreground cloud. From this map, we also derived the total extinction toward the enigmatic source IRS 2E, which amounts to ∼60 mag in the V band. We calculated the color temperature due to thermal emission of the circumstellar dust of the detected sources; the temperatures are in the interval of ∼100-150 K, which corresponds to the emission of dust located at 0.1 pc from the central source. Finally, we show a possible mid-infrared counterpart of a detected source at millimeter wavelengths that was found by Zapata et al. to be a massive young stellar object undergoing a high accretion rate.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): circumstellar matter - infrared: ISM - infrared: stars - stars: early-type - stars: formation - stars: massive

Simbad objects: 44

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Number of rows : 44
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 3576 HII 11 11 49.8 -61 18 14           ~ 230 2
2 NGC 3603 OpC 11 15 18.6 -61 15 26           ~ 992 1
3 Cl Danks 1 OpC 13 12 27 -62 42.1           ~ 65 0
4 NAME Car-Sgr Arm PoG 15 00 -40.0           ~ 450 1
5 GAL 333.1-00.4 Cl* 16 21 03.3 -50 36 19           ~ 31 1
6 Cl Westerlund 1 OpC 16 47 04.00 -45 51 04.9           ~ 497 0
7 * alf Her ** 17 14 38.85818 +14 23 25.2262   4.51 3.06     M5Ib-II+G5III+F2V: 191 0
8 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 672 0
9 W 31 SFR 18 10 28.6 -19 55 51           ~ 246 0
10 GRS G024.80 +00.10 SFR 18 38 14.8 -06 47 39           ~ 104 0
11 SNR G030.8-00.0 SNR 18 47 32 -01 56.5           ~ 473 0
12 W 49 SFR 19 10 20 +09 07.7           ~ 529 1
13 GAL 049.4-00.3 Cld 19 23 14 +14 26.9           ~ 19 0
14 [OMN2000] Region 3 PoC 19 23 29.3 +14 31 38           ~ 155 0
15 W 51b SFR 19 23 32.8 +14 29 56           ~ 78 0
16 W 51b1 PoC 19 23 35.2 +14 32 09           ~ 4 0
17 2MASX J19233591+1431288 Y*O 19 23 35.918 +14 31 28.83           ~ 5 0
18 W 51b3 Rad 19 23 36.6 +14 32 23           ~ 3 0
19 [WBN74] W 51 IRS 2W Y*O 19 23 39.787 +14 31 07.46           ~ 16 0
20 OKYM W51 IRS 2 6 IR 19 23 39.816 +14 31 05.07           ~ 22 0
21 NAME W 51 North Rad 19 23 40.0 +14 30 51           ~ 147 0
22 [WBN74] W 51 IRS 2 SFR 19 23 40.05 +14 31 07.1           ~ 258 0
23 [WBN74] W 51 IRS 2E Y*O 19 23 40.167 +14 31 06.63           ~ 21 0
24 KJD 3 IR 19 23 40.18 +14 31 06.1           ~ 6 0
25 KJD 4 IR 19 23 40.24 +14 31 07.7           ~ 2 0
26 OKYM 2 IR 19 23 40.26 +14 31 06.6           ~ 4 0
27 W 51c1 PoC 19 23 41.4 +14 29 45           ~ 3 0
28 W 51e6 PoC 19 23 41.7 +14 31 02           ~ 4 0
29 NAME W 51 IRS 1 PoC 19 23 41.9 +14 30 36           ~ 102 0
30 [KJB2003] G49.480-0.386 HII 19 23 42.0 +14 30 32           ~ 9 0
31 NAME W 51 South Rad 19 23 43 +14 29.7           ~ 20 0
32 2MASS J19234318+1430500 Y*O 19 23 43.18 +14 30 50.1           ~ 7 0
33 W 51e1 Rad 19 23 43.77 +14 30 25.9           ~ 118 0
34 NAME W 51 Main reg 19 23 43.8 +14 30 37           ~ 134 0
35 W 51e2 Rad 19 23 43.90 +14 30 34.8           ~ 189 0
36 GAL 049.5-00.4 MoC 19 23 44 +14 30.7           ~ 22 0
37 W 51e7 PoC 19 23 44.80 +14 29 10.3           ~ 5 0
38 W 51f PoC 19 23 47.8 +14 33 13           ~ 11 0
39 W 51 SNR 19 23 50 +14 06.0           ~ 1192 1
40 W 51g PoC 19 23 50.7 +14 32 51           ~ 10 0
41 * alf Aql dS* 19 50 46.99855 +08 52 05.9563 1.07 0.98 0.76 0.62 0.49 A7Vn 835 0
42 W 51d1 Rad ~ ~           ~ 12 0
43 OKYM W51 IRS 2 4 IR ~ ~           ~ 2 0
44 OKYM W51 IRS 2 5 HII ~ ~           ~ 2 0

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2021.09.27-17:45:34

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