High-energy gamma-ray study of the dynamically young SNR G150.3+4.5. (arXiv:2009.08397v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Devin_J/0/1/0/all/0/1">Justine Devin</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lemoine_Goumard_M/0/1/0/all/0/1">Marianne Lemoine-Goumard</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Grondin_M/0/1/0/all/0/1">Marie-Hélène Grondin</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Castro_D/0/1/0/all/0/1">Daniel Castro</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ballet_J/0/1/0/all/0/1">Jean Ballet</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cohen_J/0/1/0/all/0/1">Jamie Cohen</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hewitt_J/0/1/0/all/0/1">John W. Hewitt</a>
The supernova remnant (SNR) G150.3+4.5 was recently discovered in the radio
band; it exhibits a shell-like morphology with an angular size of $sim
3^{circ}$, suggesting either an old or a nearby SNR. Extended $gamma$-ray
emission spatially coincident with the SNR was reported in the Fermi Galactic
Extended Source Catalog, with a power-law spectral index of $Gamma$ = 1.91
$pm$ 0.09. Studying particle acceleration in SNRs through their $gamma$-ray
emission is of primary concern to assess the nature of accelerated particles
and the maximum energy they can reach. Using more than ten years of Fermi-LAT
data, we investigate the morphological and spectral properties of the SNR
G150.3+4.5 from 300 MeV to 3 TeV. We use the latest releases of the Fermi-LAT
catalog, the instrument response functions and the Galactic and isotropic
diffuse emissions. We use ROSAT all-sky survey data to assess any thermal and
nonthermal X-ray emission, and we derive minimum and maximum distance to
G150.3+4.5. We describe the $gamma$-ray emission of G150.3+4.5 by an extended
component which is found to be spatially coincident with the radio SNR. The
spectrum is hard and the detection of photons up to hundreds of GeV points
towards an emission from a dynamically young SNR. The lack of X-ray emission
gives a tight constraint on the ambient density $n_0 leq 3.6 times 10^{-3}$
cm$^{-3}$. Since G150.3+4.5 is not reported as a historical SNR, we impose a
lower limit on its age of $t$ = 1 kyr. We estimate its distance to be between
0.7 and 4.5 kpc. We find that G150.3+4.5 is spectrally similar to other
dynamically young and shell-type SNRs, such as RX J1713.7$-$3946 or Vela
Junior. The broadband nonthermal emission is explained with a leptonic
scenario, implying a downstream magnetic field of $B = 5$ $mu$G and
acceleration of particles up to few TeV energies.
The supernova remnant (SNR) G150.3+4.5 was recently discovered in the radio
band; it exhibits a shell-like morphology with an angular size of $sim
3^{circ}$, suggesting either an old or a nearby SNR. Extended $gamma$-ray
emission spatially coincident with the SNR was reported in the Fermi Galactic
Extended Source Catalog, with a power-law spectral index of $Gamma$ = 1.91
$pm$ 0.09. Studying particle acceleration in SNRs through their $gamma$-ray
emission is of primary concern to assess the nature of accelerated particles
and the maximum energy they can reach. Using more than ten years of Fermi-LAT
data, we investigate the morphological and spectral properties of the SNR
G150.3+4.5 from 300 MeV to 3 TeV. We use the latest releases of the Fermi-LAT
catalog, the instrument response functions and the Galactic and isotropic
diffuse emissions. We use ROSAT all-sky survey data to assess any thermal and
nonthermal X-ray emission, and we derive minimum and maximum distance to
G150.3+4.5. We describe the $gamma$-ray emission of G150.3+4.5 by an extended
component which is found to be spatially coincident with the radio SNR. The
spectrum is hard and the detection of photons up to hundreds of GeV points
towards an emission from a dynamically young SNR. The lack of X-ray emission
gives a tight constraint on the ambient density $n_0 leq 3.6 times 10^{-3}$
cm$^{-3}$. Since G150.3+4.5 is not reported as a historical SNR, we impose a
lower limit on its age of $t$ = 1 kyr. We estimate its distance to be between
0.7 and 4.5 kpc. We find that G150.3+4.5 is spectrally similar to other
dynamically young and shell-type SNRs, such as RX J1713.7$-$3946 or Vela
Junior. The broadband nonthermal emission is explained with a leptonic
scenario, implying a downstream magnetic field of $B = 5$ $mu$G and
acceleration of particles up to few TeV energies.
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