Volume 561, January 2014
|Number of page(s)||5|
|Published online||16 January 2014|
The counterpart/s of IGR J20159+3713/SWIFT J2015.9+3715: dissecting a complex region with emission from keV to TeV
INAF/IASF Bologna, via Piero Gobetti 101, 40129 Bologna Italy
2 INAF/IAPS Rome, via Fosso del Cavaliere 100, 00133 Rome, Italy
3 School of Physics and Astronomy, University of Southampton, Highfield, SO17 1BJ, UK
Accepted: 15 October 2013
We report on the identification of a new soft gamma-ray source, namely IGR J20159+3713/SWIFT J2015.9+3715, first detected by INTEGRAL/IBIS and then confirmed by Swift/BAT. The source, which has an observed 20−100 keV flux in the range (0.7−1.4) × 10-11 erg cm-2 s-1, encloses a Fermi variable source (2FGL J2015.6+3709) and is spatially close to a TeV emitter (VER J2016+372). Thanks to X-ray follow-up observations performed with the X-ray telescope on board Swift, we have been able to identify the new IBIS/BAT detection with the combined emission of the blazar B2013+370 and the cataclysmic variable RX J2015.6+3711. Both objects show variability in X-rays, with the cataclysmic variable being the most variable of the two. At high energies (above 20 keV) the emission is likely dominated by B2013+370, but the contribution from RX J2015.6+3711 is not negligible, The blazar emits up to GeV frequencies where it is seen by Fermi, while the cataclysmic variable has a bremsstrahlung temperature which is too low to provide any contribution at these high energies. These findings also indicate that the INTEGRAL/Swift source is not associated with the TeV emission, which is most likely due to the supernova remnant (SNR)/pulsar wind nebula (PWN) CTB 87.
Key words: gamma rays: general / X-rays: general
© ESO, 2014
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