2001ApJ...557..747I

Query : 2001ApJ...557..747I

2001ApJ...557..747I - Astrophys. J., 557, 747-760 (2001/August-3)

Chandra observation of the ρ Ophiuchi cloud.

IMANISHI K., KOYAMA K. and TSUBOI Y.

Abstract (from CDS):

We observed a 17'x17' region of the ρ Oph molecular cloud, using the ACIS-I array on board the Chandra X-Ray Observatory. A 100 ks exposure observation revealed ∼100 X-ray sources above the detection limit of ∼1028 ergs.s–1. About two-thirds of the X-ray sources are identified with an optical and/or IR counterpart, including significant numbers of class I, II, and III sources and a few brown dwarfs. The X-ray detection rate of class I sources is a surprisingly high 70%. Many X-ray flares, possibly because of the magnetic activity, are found from all of the classes. We make systematic spectral studies of the quiescent and flare X-rays for all the X-ray sources. The X-ray temperatures and absorptions of class I sources are generally larger than those of class II and III sources. In addition, X-ray flares from class I sources show slightly higher duty ratio, temperature, and luminosity than those of more evolved classes. We further give brief results on brown dwarfs, sources in a younger phase than class I, unclassified, and unidentified sources. Details for several selected young stellar objects, including the first detection of a neutral iron line (6.4 keV) from a class I source (YLW 16A), are separately addressed.

Abstract Copyright: ∼

Journal keyword(s): ISM: Clouds - ISM: Individual: Name: ρ Ophiuchi Cloud - Stars: Formation - Stars: Pre-Main-Sequence - X-Rays: Stars

Nomenclature: Table 1: [IKT2001] NN (Nos 1-87).

Errata: erratum vol. 579, p. 920 (2002)

Simbad objects: 90

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Number of rows : 90
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 VSSG 30 Y*O 16 26 44.19504 -24 34 48.3492           ~ 138 0
2 WL 2 Y*O 16 26 48.48624 -24 28 38.9064           ~ 64 1
3 WL 18 TT* 16 26 48.9809680488 -24 38 25.152593208       19.33 17.38 M3.5 77 0
4 BBRCG 13 Y*O 16 26 51.97104 -24 30 39.4956           M4-M6 31 1
5 [INT2003] A-65 X 16 26 52.51 -24 31 33.9           ~ 2 0
6 [INT2003] BF-6 X 16 26 53.96 -24 39 24.7           ~ 2 0
7 VSSG 5 Y*O 16 26 54.44376 -24 26 20.7204           ~ 46 1
8 WL 21 Y*O 16 26 57.33000 -24 35 38.8032           M6 45 0
9 WL 14 Or* 16 26 59.04984 -24 35 56.8788           ~ 53 0
10 WL 22 TT* 16 26 59.16720 -24 34 58.8072           ~ 66 0
11 AT20G J162700-242640 HII 16 27 00.00 -24 26 40.3           ~ 18 1
12 [GY92] 188 Y*O 16 27 03.00720 -24 26 14.6976           ~ 32 1
13 VSSG 31 Or* 16 27 04.10688 -24 28 29.9136           ~ 63 1
14 [GY92] 195 Or* 16 27 04.57464 -24 27 15.6636           ~ 34 1
15 ROXN 16 X 16 27 05.44 -24 41 14.4           ~ 4 0
16 YLW 10A TT* 16 27 05.97576 -24 26 18.5172           ~ 24 1
17 [GY92] 204 TT* 16 27 06.5924837856 -24 41 48.871282992       17.57 15.43 M5 113 0
18 WL 17 Y*O 16 27 06.77616 -24 38 14.9964           ~ 113 0
19 2MASSI J1627075-244104 Y*O 16 27 07.505 -24 41 04.07           ~ 3 0
20 [INT2003] BF-23 X 16 27 08.40 -24 39 40.3           ~ 2 0
21 WL 10 Or* 16 27 09.1062090672 -24 34 08.278196304           K9 79 0
22 [GY92] 213 Y*O 16 27 09.35328 -24 40 22.4292           ~ 33 0
23 Elia 2-29 Y*O 16 27 09.43032 -24 37 18.7716           ~ 296 1
24 WLY 1-43 Y*O 16 27 11.17992 -24 40 46.6680           ~ 62 0
25 WL 19 Y*O 16 27 11.71416 -24 38 32.0604           ~ 71 0
26 YLW 10B Y*O 16 27 15.45432 -24 26 39.8004           ~ 52 0
27 WLY 2-35 Y*O 16 27 15.51408 -24 30 53.6832           ~ 34 0
28 [INT2003] BF-34 X 16 27 15.55 -24 33 01.8           ~ 2 0
29 WL 20 TT* 16 27 15.69840 -24 38 43.4364           M0 86 0
30 NAME WL 20E TT* 16 27 15.8951829912 -24 38 43.788560604           K7 78 0
31 2MASS J16271643-2431145 Y*O 16 27 16.438 -24 31 14.55           ~ 19 0
32 [INT2003] BF-37 X 16 27 16.98 -24 36 21.2           ~ 2 0
33 [INT2003] BF-38 X 16 27 17.47 -24 36 27.1           ~ 2 0
34 YLW 12A Y*O 16 27 17.57160 -24 28 56.2944           ~ 72 0
35 WL 5 TT* 16 27 18.17064 -24 28 52.6800           ~ 91 0
36 BBRCG 39 Y*O 16 27 18.38040 -24 39 14.6844           ~ 47 0
37 VSSG 26 Or* 16 27 18.48720 -24 29 05.9136           ~ 97 0
38 [INT2003] BF-43 X 16 27 18.99 -24 33 44.3           ~ 2 0
39 WL 3 Y*O 16 27 19.21584 -24 28 43.8528           K7 69 0
40 [IKT2001] 39 X 16 27 19.34 -24 31 30.4           ~ 3 0
41 EM* SR 12 Or* 16 27 19.5054789229 -24 41 40.414828505     13.28 12.15 10.855 M0IVe 193 1
42 [INT2003] BF-47 X 16 27 19.91 -24 35 31.8           ~ 2 0
43 [INT2003] BF-48 X 16 27 20.01 -24 30 13.6           ~ 2 0
44 YLW 13B Y*O 16 27 21.46872 -24 41 43.0692           ~ 96 0
45 WL 6 Y*O 16 27 21.80448 -24 29 53.3616           ~ 116 0
46 BBRCG 43 Y*O 16 27 21.97560 -24 29 39.7716           ~ 27 0
47 [IKT2001] 46 X 16 27 22.64 -24 34 14.9           ~ 3 0
48 [INT2003] BF-54 X 16 27 23.64 -24 31 57.3           ~ 2 0
49 [GY92] 257 Y*O 16 27 24.19872 -24 29 29.4720           ~ 22 0
50 [GY92] 258 TT* 16 27 24.39000 -24 41 47.5620           ~ 23 0
51 [GY92] 259 Y*O 16 27 24.63624 -24 29 35.3976           ~ 26 0
52 [INT2003] BF-58 X 16 27 25.02 -24 34 35.4           ~ 2 0
53 YLW 16C Or* 16 27 26.48952 -24 39 23.0760           M1 56 0
54 [GY92] 264 LM* 16 27 26.5812811008 -24 25 54.395321448       17.90 15.72 M8 60 0
55 YLW 15 Y*O 16 27 26.906 -24 40 50.81           ~ 281 1
56 BBRCG 46 Y*O 16 27 27.06864 -24 32 17.5200           ~ 18 0
57 Elia 2-31 TT* 16 27 27.3786513768 -24 31 16.442242464           ~ 74 1
58 YLW 16A Y*O 16 27 28.02744 -24 39 33.5052           K8 205 0
59 Elia 2-32 Y*O 16 27 28.44576 -24 27 21.0348           K6.5 121 1
60 [INT2003] BF-65 X 16 27 28.46 -24 29 42.2           ~ 2 0
61 YLW 16B Or* 16 27 29.43528 -24 39 16.1892           ~ 108 0
62 BBRCG 50 NIR 16 27 29.6 -24 31 54           ~ 6 0
63 BBRCG 53 Y*O 16 27 29.96424 -24 33 36.5688           ~ 21 0
64 [INT2003] BF-70 X 16 27 30.13 -24 38 03.7           ~ 2 0
65 Elia 2-33 Y*O 16 27 30.18024 -24 27 43.3656           M2 125 1
66 BBRCG 56 Or* 16 27 31.0593237432 -24 34 03.262655028           ~ 22 0
67 ROXN 54 X 16 27 31.33 -24 31 10.1           ~ 4 0
68 BBRCG 60 Y*O 16 27 32.67576 -24 33 23.9328           ~ 36 0
69 BBRCG 61 Y*O 16 27 32.85048 -24 32 34.8324           ~ 33 0
70 [INT2003] BF-77 X 16 27 33.04 -24 31 48.3           ~ 2 0
71 YLW 18 TT* 16 27 33.1157754648 -24 41 15.259932924       17.66 15.65 K5-K6 88 0
72 [GY92] 295 TT* 16 27 35.2627683216 -24 38 33.428056416       16.16 14.08 M4.5 53 0
73 [INT2003] BF-80 X 16 27 36.01 -24 32 18.0           ~ 2 0
74 [GY92] 301 Y*O 16 27 37.24944 -24 42 38.0160           ~ 43 0
75 [INT2003] BF-83 X 16 27 37.83 -24 36 04.7           ~ 2 0
76 WLY 2-50 Or* 16 27 38.1256099368 -24 30 42.980129964           ~ 37 0
77 YLW 47 TT* 16 27 38.3206405584 -24 36 58.594880844       17.69 15.52 M0 104 0
78 [GY92] 310 Or* 16 27 38.6295993720 -24 38 39.214842072         17.40 M8 70 0
79 [GY92] 312 Y*O 16 27 38.94456 -24 40 20.6724           M2.5 52 0
80 ROX 27 TT* 16 27 39.4295731464 -24 39 15.527230272       15.76 14.03 M0+M4 137 0
81 YLW 45 Y*O 16 27 39.82824 -24 43 15.0672           ~ 120 0
82 [GY92] 322 Y*O 16 27 41.49432 -24 35 37.6656           ~ 19 0
83 [GY92] 326 TT* 16 27 42.7019158944 -24 38 50.619050052         17.30 M2 45 0
84 ROXN 67 X 16 27 43.63 -24 31 26.5           ~ 6 0
85 ROXN 69 X 16 27 49.16 -24 39 06.9           ~ 4 0
86 2CXO J162750.3-243149 X 16 27 50.39 -24 31 49.5           ~ 5 0
87 WLY 2-55 TT* 16 27 52.0872222936 -24 40 50.723707476     16.28 14.48 12.78 K7.5 85 0
88 [INT2003] BF-97 X 16 27 54.71 -24 37 14.8           ~ 2 0
89 [GY92] 397 Y*O 16 27 55.25496 -24 28 39.5580           M6 29 0
90 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1

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