2018ApJ...852...62V


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.12CEST14:28:02

2018ApJ...852...62V - Astrophys. J., 852, 62-62 (2018/January-1)

High-energy emission from nonrelativistic radiative shocks: application to gamma-ray novae.

VURM I. and METZGER B.D.

Abstract (from CDS):

The observation of GeV gamma-rays from novae by Fermi/LAT demonstrates that the nonrelativistic radiative shocks in these systems can accelerate particles to energies of at least ∼10 GeV. The low-energy extension of the same nonthermal particle distribution inevitably gives rise to emission in the hard X-ray band. Above 10 keV, this radiation can escape the system without significant absorption/attenuation, and can potentially be detected by NuSTAR. We present theoretical models for hard X-ray and gamma-ray emission from radiative shocks in both leptonic and hadronic scenarios, accounting for the rapid evolution of the downstream properties due to the fast cooling of thermal plasma. We find that due to strong Coulomb losses, only a fraction of 10–4–10–3 of the gamma-ray luminosity is radiated in the NuSTAR band; nevertheless, this emission could be detectable simultaneously with the LAT emission in bright gamma-ray novae with a ∼50 ks exposure. The spectral slope in hard X-rays is α~0 for typical nova parameters, thus serving as a testable prediction of the model. Our work demonstrates how combined hard X-ray and gamma-ray observations can be used to constrain properties of the nova outflow (velocity, density, and mass outflow rate) and particle acceleration at the shock. A very low X-ray to gamma-ray luminosity ratio (LX/Lγ 5×10–4) would disfavor leptonic models for the gamma-ray emission. Our model can also be applied to other astrophysical environments with radiative shocks, including SNe IIn and colliding winds in massive star binaries.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): novae, cataclysmic variables - radiation mechanisms: nonthermal - shock waves - shock waves

Simbad objects: 9

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Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NOVA Mon 2012 No* 06 39 38.74 +05 53 52.0           ~ 119 0
2 V* V712 Car bL* 10 23 58.0120989646 -57 45 48.938103165 15.466 15.473 13.5 12.6   O3If*/WN6+O3If*/WN6 147 1
3 NOVA Cen 2013 No* 13 54 45.3629118204 -59 09 04.170026638   15.5   15.1   ~ 52 0
4 NOVA Sgr 2012 No* 17 45 28.03 -23 05 22.8           ~ 28 0
5 NOVA Sco 2012 No* 17 50 53.9100383498 -32 37 21.088676666           ~ 67 0
6 V* V5856 Sgr No* 18 20 52.25 -28 22 12.1           ~ 19 0
7 NOVA Sgr 2015 b No* 18 36 57.00 -28 55 42.0           ~ 71 0
8 HD 193793 WR* 20 20 27.9763345925 +43 51 16.289775091 6.90 7.25 6.85 4.58   WC7p+O5 649 1
9 NOVA Del 2013 No* 20 23 30.6864752010 +20 46 03.777415270   17.50 16.86     ~ 157 0

    Equat.    Gal    SGal    Ecl

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2020.07.12-14:28:02

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