2009ApJ...690..850P

Query : 2009ApJ...690..850P

2009ApJ...690..850P - Astrophys. J., 690, 850-861 (2009/January-1)

GGD 27: X-rays from a massive protostar with an outflow.

PRAVDO S.H., TSUBOI Y., SUZUKI Y., THOMPSON T.J. and REBULL L.

Abstract (from CDS):

We report the discovery of a cluster of Class I protostars in GGD 27. One of these protostars is the previously known, centrally located, GGD 27-ILL, which powers a massive bipolar outflow. We show that GGD 27-ILL, which is known to be the bright infrared (IR) source, IRAS 18162-2048, and a compact radio continuum source, is also the newly discovered hard X-ray source, GGD 27-X. The observations were made with the ACIS instrument on the Chandra X-ray Observatory. The X-rays from GGD 27-X are variable when compared with 4 years earlier, with an unabsorbed 2-10 keV X-ray luminosity in this observation of 1.5-12x1031 erg/s and a plasma temperature of ≥ 107 K. The X-rays are probably associated with the underlying B0 star (rather than outflowing material), providing a rare glimpse in hard X-rays of an optically obscured massive protostar with an outflow. The X-ray luminosity and spectrum appear to be consistent with stars of its type in other star formation regions. Several other variable X-ray sources are also detected in the IR cluster that contains GGD 27-X. We also discuss another nearby cluster. In each of the clusters there is an object that is X-ray hard, highly absorbed at low energies, in a blank optical/IR/radio field, and variable in X-ray intensity by a factor of ≥ 10 on a timescale of 4 years. These latter objects may arise from more recent episodes of star formation or may be "hidden" Class III sources.

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Journal keyword(s): infrared: stars - stars: pre-main sequence - X-rays: stars

Nomenclature: Table 1: [PTS2009] NNa N=19 among (Nos 1-16). Table 2: [PTS2009] NNa N=9 among (Nos 21-26).

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 RAFGL 5123 Y*O 04 31 34.07736 +18 08 04.9020           K3V/M3III 900 0
2 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2514 0
3 * tet01 Ori B EB* 05 35 16.1339860056 -05 23 06.784444248 7.71 8.20 7.96     B1V 380 1
4 [PGS81] IRS 1 Y*O 05 47 04.78 +00 21 42.8           ~ 88 0
5 NGC 2071 RNe 05 47 10 +00 18.0           ~ 661 1
6 NAME Orion Molecular Cloud MoC 05 56 -01.8           ~ 1227 1
7 V* R Mon Ae* 06 39 09.9542000448 +08 44 09.539482632 10.76 12.46 11.85 10.96 10.25 B8IIIe 525 0
8 NGC 2264 OpC 06 40 53.7 +09 52 32           ~ 1876 0
9 [CLC98] TC1 PoC 18 02 24.7 -23 01 18           ~ 8 0
10 SSTGLMC G007.0097-00.2542 Y*O 18 02 24.70680 -23 01 17.7204           ~ 14 0
11 M 20 OpC 18 02 42 -22 58.3           ~ 456 1
12 [PTS2009] 8 X 18 19 04.126 -20 47 29.11           ~ 1 0
13 NAME HH 80-81 HH 18 19 06 -20 51.4           ~ 236 0
14 HH 80 HH 18 19 06.1 -20 51 49           ~ 104 0
15 [HL85] GGD 27-28 25 * 18 19 07.4719925808 -20 46 22.736865360           ~ 4 0
16 2MASS J18190822-2045158 LP? 18 19 08.2256115408 -20 45 15.888680928           ~ 7 0
17 2MASS J18190910-2047149 Y*O 18 19 09.0950393832 -20 47 14.990480232           ~ 3 0
18 2MASS J18190984-2047155 Y*O 18 19 09.841 -20 47 15.57           ~ 2 0
19 [PTS2009] 12b X 18 19 10.48 -20 47 40.3           ~ 1 0
20 2MASS J18191051-2046578 Y*O 18 19 10.5152674584 -20 46 57.813394620   12.61   11.74 10.54 ~ 14 0
21 [PTS2009] 12a X 18 19 10.529 -20 47 40.38           ~ 1 0
22 2MASS J18191078-2047481 X 18 19 10.7892912096 -20 47 48.228349272           ~ 2 0
23 [PTS2009] 16 X 18 19 10.903 -20 48 02.30           ~ 1 0
24 NAME GGD 27 IR Cluster Cl* 18 19 11 -20 47.3           ~ 3 0
25 [PTS2009] 6b X 18 19 11.414 -20 47 23.86           ~ 1 0
26 2MASS J18191146-2047229 NIR 18 19 11.469 -20 47 22.97           ~ 2 0
27 [HL85] GGD 27-28 34 * 18 19 11.66 -20 47 27.5           ~ 3 0
28 [PTS2009] 3 X 18 19 11.741 -20 47 04.38           ~ 2 0
29 2MASS J18191175-2047264 X 18 19 11.7580079256 -20 47 26.241013392           ~ 2 0
30 NAME HH 80-81 IRS HII 18 19 11.8 -20 47 35           ~ 157 0
31 CXOPTM J181911.8-204740 X 18 19 11.848 -20 47 40.64           ~ 2 0
32 NAME GGD 27-ILL SFR 18 19 12.00 -20 47 31.1           ~ 16 1
33 NAME GGD 27 IRS RNe 18 19 12.0870647616 -20 47 50.901137556           ~ 26 1
34 [KCW94] 010.841-02.592 Rad 18 19 12.098 -20 47 30.90           ~ 6 0
35 2MASS J18191220-2047297 Y*O 18 19 12.21 -20 47 29.7           B1 137 0
36 [PTS2009] 9b X 18 19 12.245 -20 47 31.27           ~ 1 0
37 CXOPTM J181912.4-204733 X 18 19 12.463 -20 47 35.38           ~ 2 0
38 [PTS2009] 11 X 18 19 12.948 -20 47 38.00           ~ 1 0
39 [PTS2009] 2 X 18 19 13.109 -20 46 58.80           ~ 1 0
40 2MASS J18192006-2045412 X 18 19 20.0617033800 -20 45 41.313736908           ~ 1 0
41 [PTS2009] 24d X 18 19 20.371 -20 45 49.86           ~ 1 0
42 [PTS2009] 24c X 18 19 20.539 -20 45 48.35           ~ 1 0
43 2MASS J18192066-2045464 X 18 19 20.6727505224 -20 45 46.215294768           ~ 1 0
44 [PTS2009] 24a X 18 19 20.916 -20 45 43.16           ~ 1 0
45 2MASS J18192095-2046095 Y*O 18 19 20.9542004328 -20 46 09.574359816   20.41   16.43 15.89 ~ 4 0
46 2MASS J18192109-2045558 Y*? 18 19 21.098 -20 45 55.88           ~ 3 0
47 2MASS J18192177-2045359 Y*O 18 19 21.7762036080 -20 45 35.996939352           ~ 3 0
48 NAME MRR 32 Cluster Cl* 18 19 22.06 -20 45 36.7           ~ 1 0
49 2MASS J18192208-2045368 Y*O 18 19 22.0893639600 -20 45 36.908831664           ~ 8 0
50 [HL85] GGD 27-28 17 * 18 22 07.212 -20 43 45.70           ~ 3 0
51 NAME SH 2-106 IR Y*O 20 27 26.502 +37 22 42.03           ~ 168 1
52 SH 2-106 HII 20 27 26.8 +37 22 49           ~ 453 1
53 [BGE2002] BIMA 2 Y*O 21 40 42.36 +58 16 09.7           ~ 123 0
54 NAME IC 1396 North CGb 21 40 42.6537 +58 16 01.882           ~ 193 1

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