An unidentified TeV source in the vicinity of Cygnus OB2

By F. Aharonian, A. Akhperjanian, M. Beilicke, K. Bernlöhr, H. Börst, H. Bojahr, O. Bolz, T. Coarasa, J. Contreras, J. Cortina and 52 more. 2002

165 citations recorded by the source corpus.

Deep observation (113 hrs) of the Cygnus region at TeV energies using the HEGRA stereoscopic system of air ˇ Cerenkov telescopes has serendipitously revealed a signal positionally inside the core of the OB association Cygnus OB2, at the edge of the 95% error circle of the EGRET source 3EG J2033+4118, and0:5 north of Cyg X-3. The source centre of gravity is RAJ2000 :2 0 hr 32 m 07 s 9:2 s 2:2 s ,D ecJ2000:+4130 0 30 00 2:0 0 0:4 0. The source is steady, has a post-trial significance of+4.6, indication for extension with radius 5:6 0 at the3 level, and has a dierential power-law flux with hard photon index of 1:9 0:3stat 0:3sys. The integral flux above 1 TeV amounts3% that of the Crab. No counterpart for the TeV source at other wavelengths is presently identified, and its extension would disfavour an exclusive pulsar or AGN origin. If associated with Cygnus OB2, this dense concentration of young, massive stars provides an environment conducive to multi-TeV particle acceleration and likely subsequent interaction with a nearby gas cloud. Alternatively, one could envisage-ray production via a jet-driven termination shock.

Subfields: Astronomy and Astrophysics, Electrical and Electronic Engineering, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/96ad93bc42a298895726e1b3e5619db0a48904fa

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. E. Orlando
2. J. Hinton
3. W. Hofmann
4. F. Najarro
5. C. Dermer
6. I. Grenier
7. A. Reimer
8. A. Herrero

In Electrical and Electronic Engineering

1. I. Grenier
2. S. Gabici
3. R. Blandford
4. R. Kudritzki
5. O. Kouznetsov

In Nuclear and High Energy Physics

1. C. Dermer
2. E. Orlando
3. J. Hinton
4. W. Hofmann
5. I. Grenier
6. F. Aharonian
7. et al
8. D. Horns

Citations in the corpus

• Teraelectronvolt Astronomy (2010, background): “The association of massive stars CygOB2 has also been suggested as the counterpart of the unidentified Galactic plane source discovered using HEGRA (Aharonian et al. 2002).”
• The H.E.S.S. Survey of the Inner Galaxy in Very High Energy Gamma Rays (2005, methodology): “The HEGRA instrument was the first array of imaging air Cerenkov telescopes to be used to survey a part of the Galactic plane (Aharonian et al. 2002b).”
• Is the Giant Radio Galaxy M 87 a TeV Gamma-Ray Emitter? (2003, methodology): “Recently, the BL Lac type objects 1ES 1959+650 (z = 0.047) (Nishiyama et al. 1999; Aharonian et al. 2003b) and the much more distant H 1426+428 (z = 0.129) (Horan et al. 2002; Aharonian et al. 2002a) have also been established as TeV γ-ray emitters.”
• Evaluation of three methods for calculating statistical significance when incorporating a systematic uncertainty into a test of the background-only hypothesis for a Poisson process (2007, unknown): “Reference: [40] [41] [42] [43] [44] [44] [45] [46] [47] [48] non 4 6 9 17 50 67 200 523 498426 2119449 noff 5 18.”
• The Crab Nebula and Pulsar between 500 GeV and 80 TeV: Observations with the HEGRA Stereoscopic Air Cerenkov Telescopes (2004, methodology): “The feasibility of survey-type observations is demonstrated by the first serendipitous discovery of an unidentified object with this instrument, named TeV J2035+4130 (Aharonian et al. 2002a).”
• The 2HWC HAWC Observatory Gamma-Ray Catalog (2017, background): “Source 2HWC J2031+415 is associated with TeV J2031 +4130, a PWN first reported as unidentified in TeV by HEGRA (Aharonian et al. 2002).”
• FERMI/LARGE AREA TELESCOPE BRIGHT GAMMA-RAY SOURCE LIST (2009, background): “2+4122, conclusively identified as a PSR, is spatially coincident with TeV 2032+4130 seen by HEGRA (Aharonian et al. 2002) and Milagro source MGRO J2031+41(Abdo et al. 2007).”
• Broad-band non-thermal emission from molecular clouds illuminated by cosmic rays from nearby supernova remnants (2009, background): “Following this rationale, Gabici and Aharonian (2007) proposed that some of the unidentified TeV sources detected by HEGRA (Aharonian et al. 2002), H.E.S.S. (Aharonian et al. 2006b) and MILAGRO (Abdo et al. 2007) might in fact be such clouds illuminated by a nearby SNR.”
• Discovery of an Extraordinarily Massive Cluster of Red Supergiants (2006, background): “Indeed, there is precedence for associating extended high energy sources with a cluster of massive stars, i.e. in CYG OB2 (Aharonian et al. 2002).”
• MILAGRO OBSERVATIONS OF MULTI-TeV EMISSION FROM GALACTIC SOURCES IN THE FERMI BRIGHT SOURCE LIST (2009, background): “2+4122 is a LAT identified pulsar that is spatially coincident with the HEGRA source J2032+41 (Aharonian et al. 2002), MGRO J2031+41, and the MAGIC source J2032+4130 (Albert et al. 2008).”