2006ApJ...643..238B

Query : 2006ApJ...643..238B

2006ApJ...643..238B - Astrophys. J., 643, 238-244 (2006/May-3)

Deeper Chandra follow-up of Cygnus TeV source perpetuates mystery.

BUTT Y.M., DRAKE J., BENAGLIA P., COMBI J.A., DAME T., MINIATI F. and ROMERO G.E.

Abstract (from CDS):

A 50 ks Chandra observation of the unidentified TeV source in Cygnus reported by the HEGRA collaboration reveals no obvious diffuse X-ray counterpart. However, 240 pointlike X-ray sources are detected within or nearby the extended TeV J2032+4130 source region, of which at least 36 are massive stars and two may be radio emitters. That the HEGRA source is a composite, having as a counterpart the multiple pointlike X-ray sources we observe, cannot be ruled out. Indeed, the distribution of pointlike X-ray sources appears nonuniform and concentrated broadly within the extent of the TeV source region. We offer a hypothesis for the origin of the very high energy gamma-ray emission in Cyg OB2 based on the local acceleration of TeV-range cosmic rays and the differential distribution of OB versus less massive stars in this association.

Abstract Copyright: ∼

Journal keyword(s): Acceleration of Particles - ISM: Cosmic Rays - Gamma Rays: Observations - ISM: Bubbles - Galaxy: Open Clusters and Associations: Individual: Name: Cygnus OB2

VizieR on-line data: <Available at CDS (J/ApJ/643/238): table1.dat>

Nomenclature: Table 1: [BDB2006] NNN (Nos 1-240).

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 39

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Number of rows : 39
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 ATO J307.8657+41.4880 EB* 20 31 27.7928658696 +41 29 17.189810448   16.4 15.0     ~ 5 0
2 GSC 03161-00908 * 20 31 33.5856503160 +41 28 57.819263808   13.4 12.7     ~ 3 0
3 RLP 569 * 20 31 34.7716704288 +41 29 32.975840328   17.05 15.86     ~ 3 0
4 2MASS J20313727+4123356 * 20 31 37.2730113384 +41 23 35.382737184   13.9 12.38     G6V 8 0
5 2MASS J20313736+4124134 * 20 31 37.3589857560 +41 24 13.377724884   17.23 15.30     ~ 3 0
6 TeV J2032+4130 gam 20 31.7 +41 31           ~ 148 0
7 Schulte 20 SB* 20 31 49.6575031512 +41 28 26.510600388 12.67 12.63 11.52     O9III+B 50 0
8 GSC 03161-01075 * 20 31 50.8790361600 +41 31 17.339590812   14.23 13.64 13.42   ~ 4 1
9 2MASS J20315139+4129526 * 20 31 51.3846803160 +41 29 52.638675864   16.6 15.7     ~ 3 0
10 GSC 03161-00619 * 20 31 53.8299655272 +41 37 29.203782744   13.9 13.2     ~ 4 0
11 2MASS J20315408+4134395 * 20 31 54.0768583872 +41 34 39.440590392   16.6 15.7     ~ 2 0
12 NAME Cyg Complex reg 20 32 +45.0           ~ 667 0
13 GSC 03161-01061 * 20 32 06.12 +41 24 36.7   13.3 12.66     ~ 3 0
14 [MT91] 198 * 20 32 06.17 +41 24 39.3   13.34 12.68     ~ 2 0
15 2MASS J20320978+4126405 Y*? 20 32 09.78792 +41 26 40.5564           ~ 3 0
16 2MASS J20321004+4130188 Y*? 20 32 10.0403596992 +41 30 18.912291588   16.55 15.31     ~ 4 0
17 [BDB2006] 22 X 20 32 12.240 +41 26 49.19           ~ 2 0
18 [MT91] 213 Psr 20 32 13.1247390384 +41 27 24.346666440 13.12 13.08 11.266     B0Vp 334 0
19 [BDB2006] 47 X 20 32 13.440 +41 27 11.52           ~ 2 0
20 BD+40 4219 * 20 32 13.8219154968 +41 27 12.006516060 11.50 11.40 10.22     O7III((f)) 115 0
21 RLP 526 * 20 32 14.2141505136 +41 26 31.294810140   16.35 15.5     ~ 4 0
22 [BDB2006] 30 X 20 32 14.390 +41 26 34.80           ~ 2 0
23 RLP 229 * 20 32 15.1 +41 33 21   16.6 15.7     ~ 2 0
24 Schulte 14 Em* 20 32 16.5622071096 +41 25 35.670679176 12.84 12.27 11.47     O9V 53 0
25 RLP 230 Pu* 20 32 19.9319447880 +41 33 55.030476888   16.4 15.5 14.75 13.86 ~ 3 0
26 RLP 531 * 20 32 21.3196901424 +41 28 25.756918572   16.6 15.62     ~ 3 0
27 BD+40 4220 s*b 20 32 22.4238071594 +41 18 18.942475904 11.32 10.61 9.185     O7Iafep 414 0
28 TYC 3161-1042-1 * 20 32 25.3353099648 +41 34 01.810314876   12.54 12.06     ~ 5 0
29 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 2035 2
30 RLP 499 * 20 32 27.2 +41 29 41   16.49 15.48     ~ 4 0
31 Schulte 15 SB* 20 32 27.6544131144 +41 26 22.073616744 12.39 12.30 11.10     O8V+B 55 0
32 Schulte 21 * 20 32 27.7375852104 +41 28 52.248099612 12.39 12.01 11.30 11.05   B0Ib 50 0
33 RLP 512 * 20 32 29.0 +41 25 50   16.6 15.7     ~ 2 0
34 2MASS J20323835+4128567 * 20 32 38.3435626200 +41 28 56.719109964   15.68 14.43     B3V 16 0
35 Schulte 16 * 20 32 38.5694704320 +41 25 13.776724056 12.05 11.88 11.12     O7.5IV(n) 55 0
36 2MASS J20323886+4125208 * 20 32 38.8624280376 +41 25 20.817913620 14.29 14.26 13.05     B1V 18 0
37 BD+40 4221 * 20 32 45.4494231552 +41 25 37.543209348 12.06 11.93 10.68     O8.5V(n) 64 0
38 BD+41 3798 * 20 32 46.1930637864 +41 36 16.076264436   11.20 10.61     ~ 4 0
39 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 1023 0

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