Please use this identifier to cite or link to this item:
http://hdl.handle.net/2445/128499
Title: | Hard X-Ray emission from Sh 2-104: a NuSTAR search for Gamma-Ray counterparts |
Author: | Gotthelf, E. V. Mori, K. Aliu, E. Paredes i Poy, Josep Maria Tomsick, John A. Boggs, S. E. Christensen, F. E. Craig, W. W. Hailey, C. J. Harrison, F. A. Hong, J. S. Rahoui, F. Stern, D. Zhang, W. W. |
Keywords: | Astronomia de raigs X Raigs gamma Estels de neutrons X-ray astronomy Gamma rays Neutron stars |
Issue Date: | 20-Jul-2016 |
Publisher: | Institute of Physics (IOP) |
Abstract: | We present NuSTAR hard X-ray observations of Sh 2-104, a compact H ii region containing several young massive stellar clusters (YMSCs). We have detected distinct hard X-ray sources coincident with localized VERITAS TeV emission recently resolved from the giant gamma-ray complex MGRO J2019+37 in the Cygnus region. Fainter, diffuse X-rays coincident with the eastern YMSC in Sh2-104 likely result from the colliding winds of a component star. Just outside the radio shell of Sh 2-104 lies 3XMM J201744.7+365045 and a nearby nebula, NuSTAR J201744.3+364812, whose properties are most consistent with extragalactic objects. The combined XMM-Newton and NuSTAR spectrum of 3XMM J201744.7+365045 is well-fit to an absorbed power-law model with ${N}_{{\rm{H}}}=(3.1\pm 1.0)\times {10}^{22}$ cm−2 and a photon index ${\rm{\Gamma }}=2.1\pm 0.1$. Based on possible long-term flux variation and the lack of detected pulsations (≤43% modulation), this object is likely a background active galactic nucleus rather than a Galactic pulsar. The spectrum of the NuSTAR nebula shows evidence of an emission line at E = 5.6 keV, suggesting an optically obscured galaxy cluster at z = 0.19 ± 0.02 (d = 800 Mpc) and L X = 1.2 × 1044 erg s−1. Follow-up Chandra observations of Sh 2-104 will help identify the nature of the X-ray sources and their relation to MGRO J2019+37. We also show that the putative VERITAS excess south of Sh 2-104, is most likely associated with the newly discovered Fermi pulsar PSR J2017+3625 and not the H ii region. |
Note: | Reproducció del document publicat a: https://doi.org/10.3847/0004-637X/826/1/25 |
It is part of: | Astrophysical Journal, 2016, vol. 826, num. 25 |
URI: | http://hdl.handle.net/2445/128499 |
Related resource: | https://doi.org/10.3847/0004-637X/826/1/25 |
ISSN: | 0004-637X |
Appears in Collections: | Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) Articles publicats en revistes (Física Quàntica i Astrofísica) |
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670201.pdf | 1.93 MB | Adobe PDF | View/Open |
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