2007ApJ...658.1144S

Query : 2007ApJ...658.1144S

2007ApJ...658.1144S - Astrophys. J., 658, 1144-1151 (2007/April-1)

Hard X-rays and fluorescent iron emission from the embedded infrared cluster in NGC 2071.

SKINNER S.L., SIMMONS A.E., AUDARD M. and GUDEL M.

Abstract (from CDS):

We present first results of XMM-Newton X-ray observations of the infrared cluster lying near the NGC 2071 reflection nebula in the Orion B region. This cluster is of interest because it is one of the closest regions known to harbor embedded high-mass stars. We report the discovery of hard X-ray emission from the dense central NGC 2071-IR subgroup, which contains at least three high-mass young stellar objects (NGC 2071 IRS 1, IRS 2, and IRS 3). A prominent X-ray source is detected within 1" of the infrared source IRS 1, which is thought to drive a powerful bipolar molecular outflow. The X-ray spectrum of this source is quite unusual compared to the optically thin plasma spectra normally observed in young stellar objects (YSOs). The spectrum is characterized by a hard broadband continuum plus an exceptionally broad emission line at ~6.4 keV from neutral or near-neutral iron. The fluorescent Fe line likely originates in cold material near the embedded star (i.e., a disk or envelope) that is irradiated by the hard, heavily absorbed X-ray source.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: Open Clusters and Associations: Individual: NGC Number: NGC 2071 - Stars: Formation - X-Rays: Stars

Nomenclature: Table 1: [SSA2007] NN (Nos 1-33).

Simbad objects: 54

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Number of rows : 54
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 V* DG Tau TT* 04 27 04.6921275888 +26 06 16.060169268 13.57 13.97 10.50 12.28   K6Ve 1092 1
2 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1498 0
3 LDN 1630 DNe 05 45.5 -00 59           ~ 392 0
4 2MASS J05464408+0018031 TT* 05 46 44.0933464440 +00 18 03.081565728           K5 17 0
5 [SSA2007] 2 X 05 46 44.91 +00 24 51.3           ~ 1 0
6 [SSA2007] 3 X 05 46 45.84 +00 17 00.3           ~ 1 0
7 2MASS J05465148+0019213 TT* 05 46 51.4828777824 +00 19 21.330627240           M3.5 19 0
8 2MASS J05465185+0019385 Or* 05 46 51.8558166288 +00 19 38.581916556           M4 7 0
9 2MASS J05465241+0020016 TT* 05 46 52.4159850048 +00 20 01.665353868           K9 22 0
10 [SSA2007] 7 X 05 46 53.47 +00 26 32.3           ~ 1 0
11 2MASS J05465653+0020529 TT* 05 46 56.5399723560 +00 20 52.925072460           K3 8 0
12 2MASS J05465836+0022362 * 05 46 58.3721643360 +00 22 36.332060772           ~ 1 0
13 2MASS J05465859+0020294 * 05 46 58.5980503680 +00 20 29.473253700           ~ 3 0
14 2MASS J05465902+0024578 Y*O 05 46 59.03 +00 24 57.9           ~ 4 0
15 2MASS J05470331+0023232 Y*O 05 47 03.3139100376 +00 23 23.273392848           M1.8 16 0
16 [WRA93] IRS 7 IR 05 47 04.01 +00 22 10.5           ~ 8 0
17 [TSM2020] HOPS-361-D IR 05 47 04.317 +00 21 38.03           ~ 7 0
18 NAME NGC 2071 IR SFR 05 47 04.4 +00 21 49           ~ 75 0
19 [PGS81] IRS 3 IR 05 47 04.63 +00 21 47.9           ~ 57 0
20 [PGS81] IRS 1 Y*O 05 47 04.78 +00 21 42.8           ~ 88 0
21 2MASS J05470494+0018316 TT* 05 47 04.9440069192 +00 18 31.643991936           M1.5 7 0
22 NVSS J054705+002147 Rad 05 47 05.01 +00 21 47.2           ~ 1 0
23 [PGS81] IRS 4 Y*O 05 47 05.129 +00 22 01.38           ~ 13 0
24 [SSA2007] 15 X 05 47 05.21 +00 23 08.4           ~ 1 0
25 2MASS J05470525+0022535 X 05 47 05.25 +00 22 53.6           ~ 1 0
26 [PGS81] IRS 2 Y*O 05 47 05.38752 +00 21 50.0508           ~ 35 0
27 HH 437 HH 05 47 05.68 +00 21 49.6           ~ 3 0
28 [WRA93] IRS 6 Y*O 05 47 05.70024 +00 22 10.3224           ~ 19 0
29 2MASS J05470625+0024539 Y*O 05 47 06.2580745368 +00 24 53.986166388           M1.6 11 0
30 EM* LkHA 308 TT* 05 47 07.2632601168 +00 19 32.170074348   18.0 15.9     M0 26 0
31 2MASS J05470764+0017407 * 05 47 07.6412417352 +00 17 40.761498156           ~ 4 0
32 IRAS 05445+0016 IR 05 47 07.8 +00 17 46           ~ 15 0
33 [HLB98] Onsala 59 Mas 05 47 07.8 +00 17 46           ~ 2 0
34 HD 290861A EB* 05 47 07.9122481367 +00 17 56.235172272   11.79 10.61     ~ 46 0
35 HD 290861 Y*O 05 47 07.9128323612 +00 17 56.226520463   11.004 9.954 9.593   F8 51 0
36 [SSA2007] 22 X 05 47 08.92 +00 20 26.5           ~ 1 0
37 2MASS J05470976+0022360 X 05 47 09.77 +00 22 36.1           ~ 1 0
38 NGC 2071 RNe 05 47 10 +00 18.0           ~ 661 1
39 [SSA2007] 24 X 05 47 10.21 +00 20 08.9           ~ 1 0
40 2MASS J05471036+0017218 Y*O 05 47 10.36 +00 17 21.8           ~ 3 0
41 [SSA2007] 27 X 05 47 10.70 +00 26 19.9           ~ 1 0
42 2MASS J05471072+0018462 Or* 05 47 10.7255370264 +00 18 46.270279584       18.7   M1 4 0
43 EM* LkHA 310 TT* 05 47 10.9810095480 +00 19 14.765040480   18.0 15.6     G6 28 0
44 2MASS J05471201+0017568 * 05 47 12.0161564481 +00 17 56.863775526           ~ 4 0
45 2MASS J05471291+0022064 Or* 05 47 12.9168312600 +00 22 06.537517212           M0 17 0
46 [SSA2007] 31 X 05 47 15.51 +00 18 43.2           ~ 1 0
47 2MASS J05471591+0023203 X 05 47 15.92 +00 23 20.4           ~ 1 0
48 2MASS J05471918+0019206 Y*O 05 47 19.1870045928 +00 19 20.629085376           M6 15 0
49 NAME Mon R2 IRS 2 * 06 07 45.83 -06 22 53.5           B0 122 0
50 NAME Mon R2 HII 06 07 47.58 -06 22 42.6           ~ 789 2
51 CXOU J174720.2-282305 X 17 47 20.15 -28 23 05.8           ~ 5 0
52 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2443 1
53 [WRA93] IRS 5 IR ~ ~           ~ 8 0
54 [WRA93] IRS 29 IR ~ ~           ~ 2 0

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