Exploring the region encompassing gamma Cygni SNR and MAGIC J2019+408 with the GMRT at 325 and 610 MHz

Abstract

Gamma Cygni is a young supernova remnant located in the Cygnus region. MAGIC (Major Atmospheric Gamma Imaging Cherenkov) telescopes detected TeV emission (MAGIC J2019+408) to the north-west of this remnant, about 5 arcmin from its border. We want to identify the radio sources within the region encompassing gamma Cygni and MAGIC J2019+408 to shed light on their nature and investigate if these radio sources could be potential contributors to gamma-ray emission. We carried out a detailed study of the data we obtained with a survey of the Cygnus region at 325 and 610 MHz with the Giant Metrewave Radio Telescope (GMRT). We detected several radio sources in the region where the radio and the TeV emission overlap, as well as several areas of enhanced radio emission. In particular, two of these areas of diffuse enhanced emission may correspond to the supernova remnant interacting with a high density region, which seems to be the best candidate for the MAGIC source. Another two radio sources, which may or may not contribute to the gamma rays, are also spatially coincident with the emission peak of the MAGIC TeV source. One of them displays a rather peculiar extended morphology whose nature is completely unknown. We have identified the radio sources overlapping gamma Cygni and MAGIC J2019+408 and have shown that their potential gamma-ray contribution is likely not dominant. In addition, some of the studied sources show peculiar physical characteristics that deserve deeper multi-wavelength observations.

arXiv comment8 pages, 6 figures, Accepted for publication in Astronomy & Astrophysics

References in corpus (23)

• Energy spectra of gamma-rays, electrons and neutrinos produced at proton-proton interactions in the very high energy regime
• The GMRT 150 MHz All-sky Radio Survey: First Alternative Data Release TGSS ADR1
• The UKIDSS Galactic Plane Survey
• The XMM-Newton serendipitous survey IX. The fourth XMM-Newton serendipitous source catalogue
• Detection of 16 Gamma-Ray Pulsars Through Blind Frequency Searches Using the Fermi LAT
• Search for Spatially Extended Fermi-LAT Sources Using Two Years of Data
• Radio Jets from Young Stellar Objects
• Pulsar Wind Nebulae Created by Fast-Moving Pulsars
• ASCA View of the Supernova Remnant Gamma Cygni (G78.2+2.1): Bremsstrahlung X-ray Spectrum from Loss-flattened Electron Distribution
• Discovery of TeV Gamma-ray Emission Toward Supernova Remnant SNR G78.2+2.1
• The Dependence of Protostellar Luminosity on Environment in the Cygnus-X Star-Forming Complex
• Large-scale flow dynamics and radiation in pulsar gamma-ray binaries
• X-ray and Radio Observations of the gamma Cygni Supernova Remnant G78.2+2.1
• Non-thermal emission from cosmic rays accelerated in HII regions
• Giant Metrewave Radio Telescope Observations of Head-Tail Radio Galaxies
• The termination region of high-mass microquasar jets
• Jet trails and Mach cones: The interaction of microquasars with the ISM
• The GeV counterpart of VER J2019+407 in the northern shell of the supernova remnant G78.2+2.1 ($\gamma$ Cygni)
• Hard X-ray Emission Clumps in the gamma-Cygni Supernova Remnant: an INTEGRAL-ISGRI View
• Radio counterparts of gamma-ray sources in the Cygnus region
• AGILE study of the gamma-ray emission from the SNR G78.2+2.1 (Gamma Cygni)
• Cygnus survey with the Giant Metrewave Radio Telescope at 325 and 610 MHz: the catalog
• A multiwavelength study of the ultracompact HII region associated with IRAS 20178+4046