The Hard X-Ray View of the Young Supernova Remnant G1.9+0.3
Abstract
NuSTAR observed G1.9+0.3, the youngest known supernova remnant in the Milky Way, for 350 ks and detected emission up to ~30 keV. The remnant's X-ray morphology does not change significantly across the energy range from 3 to 20 keV. A combined fit between NuSTAR and Chandra shows that the spectrum steepens with energy. The spectral shape can be well fitted with synchrotron emission from a power-law electron energy distribution with an exponential cutoff with no additional features. It can also be described by a purely phenomenological model such as a broken power law or a power law with an exponential cutoff, though these descriptions lack physical motivation. Using a fixed radio flux at 1 GHz of 1.17 Jy for the synchrotron model, we get a column density of N H = (7.23 ± 0.07) × 1022 cm-2, a spectral index of α = 0.633 ± 0.003, and a roll-off frequency of νrolloff = (3.07 ± 0.18) × 1017 Hz. This can be explained by particle acceleration, to a maximum energy set by the finite remnant age, in a magnetic field of about 10 μG, for which our roll-off implies a maximum energy of about 100 TeV for both electrons and ions. Much higher magnetic-field strengths would produce an electron spectrum that was cut off by radiative losses, giving a much higher roll-off frequency that is independent of magnetic-field strength. In this case, ions could be accelerated to much higher energies. A search for 44Ti emission in the 67.9 keV line results in an upper limit of 1.5 × 10-5 photons cm-2 s-1 assuming a line width of 4.0 keV (1 sigma).
- Publication:
-
The Astrophysical Journal
- Pub Date:
- January 2015
- DOI:
- 10.1088/0004-637X/798/2/98
- arXiv:
- arXiv:1411.6752
- Bibcode:
- 2015ApJ...798...98Z
- Keywords:
-
- ISM: supernova remnants;
- X-rays: individual: G1.9+0.3;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- 9 pages, 6 figures, accepted ApJ