NuSTAR Observations of G11.2–0.3

Madsen, K. K.; Fryer, C. L.; Grefenstette, B. W.; Lopez, L. A.; Reynolds, S.; Zoglauer, A.

doi:10.3847/1538-4357/ab54ca

Title: NuSTAR Observations of G11.2–0.3

Journal Article · 20 January 2020 · The Astrophysical Journal (Online)

DOI: https://doi.org/10.3847/1538-4357/ab54ca · OSTI ID:1774423

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California Institute of Technology (CalTech), Pasadena, CA (United States). Cahill Center for Astronomy and Astrophysics
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
The Ohio State Univ., Columbus, OH (United States)
North Carolina State Univ., Raleigh, NC (United States)
Univ. of California, Berkeley, CA (United States). Space Sciences Lab.

In this work, we present the hard X-ray view of the pulsar wind nebula in G11.2-0.3 and its central pulsar powered pulsar J1811-1925 as seen by NuSTAR. We complement the data with Chandra for a more complete picture and confirm the existence of a hard, power-law component in the shell with photon index $${\rm{\Gamma }}=2.1\pm 0.1$$, which we attribute to synchrotron emission. Our imaging observations of the shell show a slightly smaller radius at higher energies, consistent with Chandra results, and we find shrinkage as a function of increased energy along the jet direction, indicating that the electron outflow in the PWN may be simpler than that seen in other young PWNe. Combining NuSTAR with INTEGRAL, we find that the pulsar spectrum can be fit by a power law with $${\rm{\Gamma }}=1.32\pm 0.07$$ up to 300 keV without evidence of curvature.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: National Aeronautic and Space Administration (NASA); USDOE National Nuclear Security Administration (NNSA). Office of Defense Programs (DP)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1774423

Report Number(s):: LA-UR--19-23251

Journal Information:: The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 1 Vol. 889; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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