2003ApJ...589..487M

Query : 2003ApJ...589..487M

2003ApJ...589..487M - Astrophys. J., 589, 487-494 (2003/May-3)

Search for a point-source counterpart of the unidentified gamma-ray TeV J2032+4130 in Cygnus.

MUKHERJEE R., HALPERN J.P., GOTTHELF E.V., ERACLEOUS M. and MIRABAL N.

Abstract (from CDS):

We have made a multiwavelength study of the overlapping error boxes of the unidentified γ-ray sources TeV J2032+4130 and 3EG J2033+4118 in the direction of the Cygnus OB2 association (d=1.7 kpc) in order to search for a point-source counterpart of the first unidentified TeV source. Optical identifications and spectroscopic classifications for the brighter X-ray sources in ROSAT PSPC and Chandra ACIS images are obtained, without finding a compelling counterpart. The classified X-ray sources are a mix of early- and late-type stars, with one exception. The brightest source in the Chandra observation is a new, hard absorbed source that is both transient and rapidly variable. It lies 7' from the centroid of the TeV emission, which places it outside of the claimed 2 σ location (r~4'.8). A possible eclipse or ``dip'' transition is seen in its light curve. With a peak 1-10 keV luminosity of ~7x1032(d/1.7 kpc)2 ergs/s, this source could be a quiescent low-mass X-ray binary that lies beyond the Cyg OB2 association. A coincident, reddened optical object of R=20.4, J=15.4, H=14.2, and K=13.4 is observed but not yet classified as a result of the lack of obvious emission or absorption features in its spectrum. Alternatively, this Chandra and optical source might be a considered a candidate for a ``proton blazar'', a long hypothesized type of radio-weak γ-ray source. More detailed observations will be needed to determine the nature of this variable X-ray source and to assess the possibility of its connection with TeV J2032+4130.

Abstract Copyright: ∼

Journal keyword(s): Gamma Rays: Observations - X-Rays: Stars

Nomenclature: Figs 1, 3, Table 1: [MHG2003] a (Nos a-r). Fig. 4, Table 2: [MHG2003] NN (Nos 1-27).

CDS comments: TeV J2032+4130 = NAME TeV J2032+4130 in SIMBAD.

Simbad objects: 62

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Number of rows : 62
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 NAME MONOCEROS NEB SNR 06 38 43 +06 30.2           ~ 264 0
2 4U 1624-49 LXB 16 28 02.825 -49 11 54.61           ~ 250 0
3 NGC 6251 Bla 16 32 31.96989253 +82 32 16.3999044 15.24 14.66 12.89 7.62   ~ 772 1
4 PSR J1836+5925 Psr 18 36 13.661 +59 25 29.77           ~ 153 0
5 [VV2006] J200556.6-231027 Bla 20 05 56.59553204 -23 10 27.0097030     19.30     ~ 86 1
6 QSO J2015+371 BLL 20 15 28.72978661 +37 10 59.5147372     21.82 21.4   ~ 324 2
7 GRO J2021+37 gam 20 22 37.2 +37 16 53           ~ 94 2
8 ZTF J203123.56+412948.9 RS* 20 31 23.5645058256 +41 29 48.897657636       15.83 14.91 ~ 5 0
9 NVSS J203131+412512 Rad 20 31 31.18 +41 25 12.6           ~ 1 0
10 [MHG2003] 19 * 20 31 33.650 +41 26 51.71           ~ 1 0
11 2MASS J20313727+4123356 * 20 31 37.2730113384 +41 23 35.382737184   13.9 12.38     G6V 8 0
12 BD+40 4212 SB* 20 31 37.5053189952 +41 13 21.001757520 12.46 11.5 10.214     O6IV:+O9III 83 1
13 [MHG2003] 9 * 20 31 39.1018637568 +41 30 17.969731488           ~ 1 0
14 TeV J2032+4130 gam 20 31.7 +41 31           ~ 148 0
15 2MASS J20314376+4135548 Y*? 20 31 43.7686357128 +41 35 55.059619164           ~ 2 0
16 NVSS J203145+413534 Rad 20 31 45.08 +41 35 34.2           ~ 1 0
17 [MHG2003] 24 * 20 31 47.5422342888 +41 24 47.924780400           ~ 1 0
18 NVSS J203148+413358 Rad 20 31 48.17 +41 33 58.3           ~ 1 0
19 GSC 03161-01433 * 20 31 51.3156183351 +41 23 23.290924534   13.51 12.71 12.59   G3V 18 0
20 [BDB2006] 234 X 20 31 51.840 +41 31 18.84           ~ 4 0
21 [BDB2006] 227 X 20 31 56.426 +41 37 23.35           ~ 2 0
22 NVSS J203156+413531 Rad 20 31 56.81 +41 35 31.4           ~ 1 0
23 NVSS J203201+413722 Rad 20 32 01.34 +41 37 22.7           ~ 3 0
24 [MHG2003] 5 X 20 32 05.328 +41 33 12.38           ~ 1 0
25 2MASS J20320684+4125101 * 20 32 06.85 +41 25 10.1           ~ 1 0
26 [MHG2003] q X 20 32 07.330 +41 08 50.56   14.7       ~ 1 0
27 NVSS J203208+412917 Rad 20 32 08.33 +41 29 17.4           ~ 1 0
28 [MHG2003] 3 * 20 32 10.2266527776 +41 35 10.949464284           ~ 1 0
29 [MT91] 213 Psr 20 32 13.1247390384 +41 27 24.346666440 13.12 13.08 11.266     B0Vp 334 0
30 BD+40 4219 * 20 32 13.8219154968 +41 27 12.006516060 11.50 11.40 10.22     O7III((f)) 115 0
31 [MT91] 221 * 20 32 14.6955487680 +41 27 39.686180652   14.92 13.62     B2V 14 0
32 NVSS J203217+412621 Rad 20 32 17.04 +41 26 21.4           ~ 1 0
33 [MHG2003] 11 * 20 32 18.8328754968 +41 29 32.409947760           ~ 1 0
34 RLP 528 * 20 32 19.2581280792 +41 27 57.407293188   15.86 14.89 14.62   G8V 4 0
35 BD+40 4220 s*b 20 32 22.4238071594 +41 18 18.942475904 11.32 10.61 9.185     O7Iafep 414 0
36 TYC 3161-1042-1 * 20 32 25.3353099648 +41 34 01.810314876   12.54 12.06     ~ 5 0
37 2MASS J20322575+4128425 Pu* 20 32 25.7252557069 +41 28 42.351760913       17.75 16.38 ~ 3 0
38 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 2035 2
39 [MHG2003] 6 X 20 32 27.456 +41 32 50.78           ~ 1 0
40 Schulte 15 SB* 20 32 27.6544131144 +41 26 22.073616744 12.39 12.30 11.10     O8V+B 55 0
41 2MASS J20322804+4128287 * 20 32 28.04 +41 28 28.8           ~ 2 0
42 [MHG2003] 8 * 20 32 30.4459684056 +41 31 02.530728372           ~ 1 0
43 RLP 887 SB* 20 32 31.5336715464 +41 14 08.190216276   15.44 13.00 12.15   O7Ib(f) 43 0
44 [MHG2003] 12 EB? 20 32 37.8541609464 +41 28 52.575974904       16.56 15.26 ~ 3 0
45 Schulte 12 s*b 20 32 40.9572199728 +41 14 29.279036940 16.1 14.45 11.702     B3-4Ia+ 453 0
46 2MASS J20324154+4127430 * 20 32 41.54 +41 27 43.0   16.8       ~ 1 0
47 LSPM J2032+4127 PM* 20 32 42.0097182840 +41 27 47.739249360   17.4   15.6   M3 6 0
48 BD+40 4221 * 20 32 45.4494231552 +41 25 37.543209348 12.06 11.93 10.68     O8.5V(n) 64 0
49 2MASS J20325224+4128173 * 20 32 52.25 +41 28 17.3           ~ 1 0
50 NVSS J203252+413009 Rad 20 32 52.27 +41 30 09.5           ~ 1 0
51 [BBC2003] XS 04358.B3-017 * 20 32 54.7895274768 +41 25 15.800665836   17.41 16.33     ~ 4 0
52 2MASS J20330176+4111107 CV* 20 33 01.7776959048 +41 11 10.798287972     16.73 18.10 16.95 ~ 8 0
53 ZTF J203303.92+412408.5 BY* 20 33 03.9186534360 +41 24 08.442979776   16.4 15.7     ~ 5 0
54 Schulte 22 SB* 20 33 08.799 +41 13 18.21 14.33 13.59 11.55     O3If*+O6V((f)) 76 0
55 Schulte 9 s*b 20 33 10.7362926720 +41 15 08.222370372 13.38 12.77 10.96     O5I+O4III 243 0
56 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 1023 0
57 Schulte 7 * 20 33 14.1095938872 +41 20 21.904113804 12.24 12.00 10.55     O3If* 153 0
58 BD+40 4227A SB* 20 33 15.0781182864 +41 18 50.479292556 10.42 10.27 8.98 8.03 6.83 O6Ib(fc)+O4.5:III:(fc) 253 0
59 RLP 841 ** 20 33 23.472072 +41 09 12.90312 14.97 14.23 11.83 10.98   O6IV((f)) 43 0
60 TYC 3157-495-1 * 20 33 42.0612250176 +41 07 53.945994684   12.12 11.405     ~ 7 0
61 GeV J2035+4214 gam 20 35.0 +42 13           ~ 12 0
62 PSR J2229+6114 Psr 22 29 05.262 +61 14 08.48           ~ 252 2

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