Search for a Point-Source Counterpart of the Unidentified Gamma-Ray Source TeV J2032+4130 in Cygnus
| dc.creator | Mukherjee, R. | |
| dc.creator | Halpern, J. P. | |
| dc.creator | Gotthelf, E. V. | |
| dc.creator | Eracleous, M. | |
| dc.creator | Mirabal, N. | |
| dc.date | 2003-02-06 | |
| dc.date.accessioned | 2026-07-07T10:47:35Z | |
| dc.date.available | 2026-07-07T10:47:35Z | |
| dc.description | We have made a multiwavelength study of the overlapping error boxes of the unidentified gamma-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 sigma location (r = 4.8'). A possible eclipse or "dip" transition is seen in its light curve. With a peak 1-10 keV luminosity of 7 x 10^(32) (d/1.7 kpc})^2 ergs s^(-1), 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 due to 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 gamma-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. | |
| dc.description | 24 pages, 8 figures, accepted by ApJ | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0302130 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0302130 | |
| dc.identifier | Astrophys.J.589:487-494,2003 | |
| dc.identifier | doi:10.1086/374641 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/183581 | |
| dc.subject | Astrophysics | |
| dc.title | Search for a Point-Source Counterpart of the Unidentified Gamma-Ray Source TeV J2032+4130 in Cygnus | |
| dc.type | text |