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Title: NuSTAR OBSERVATIONS OF MAGNETAR 1E 1048.1–5937

Journal Article · · The Astrophysical Journal (Online)
 [1]; ORCiD logo [2];  [3]; ORCiD logo [4]; ORCiD logo [2]; ORCiD logo [5];  [6];  [3]
  1. Beijing Inst. of Technology (China); McGill Univ., Montreal, QC (Canada)
  2. McGill Univ., Montreal, QC (Canada)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Stanford Univ., CA (United States)
  5. Pontifica Univ. Catolica De Chile, Santiago (Chile)
  6. Columbia Univ., New York, NY (United States)
+ Show Author Affiliations

We report on simultaneous Nuclear Spectroscopic Telescope Array (NuSTAR) and XMM-Newton observations of the magnetar 1E 1048.1-5937, along with Rossi X-ray Timing Explorer (RXTE) data for the same source. The NuSTAR data provide a clear detection of this magnetar’s persistent emission up to 20 keV. We detect a previously unreported small secondary peak in the average pulse profile in the 7–10 keV band, which grows to an amplitude comparable to that of the main peak in the 10–20 keV band. We show using RXTE data that this secondary peak is likely transient. We find that the pulsed fraction increases with energy from a value of ~0.55 at ~2 keV to a value of ~0.75 near 8 keV but shows evidence of decreasing at higher energies. After filtering out multiple bright X-ray bursts during the observation, we find that the phase-averaged spectrum from combined NuSTAR and XMM data is well described by an absorbed double blackbody plus power-law model, with no evidence for the spectral turn-up near ~10 keV as has been seen in some other magnetars. Our data allow us to rule out a spectral turn-up similar to those seen in magnetars 4U 0142+61 and 1E 2259+586 of ΔΓ≳2, where ΔΓ is the difference between the softband and hard-band photon indexes. The lack of spectral turn-up is consistent with what has been observed from an active subset of magnetars given previously reported trends suggesting that the degree of spectral turn-up is correlated with spin-down rate and/or spin-inferred magnetic field.

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1343044
Report Number(s):
LLNL-JRNL-678161; TRN: US1701314
Journal Information:
The Astrophysical Journal (Online), Vol. 831, Issue 1; ISSN 1538-4357
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

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Cited By (3)

The long-term enhanced brightness of the magnetar 1E 1547.0–5408 journal January 2020
X-Ray Monitoring of the Magnetar CXOU J171405.7–381031 in Supernova Remnant CTB 37B journal September 2019
Two New Outbursts and Transient Hard X-Rays from 1E 1048.1-5937 journal February 2020

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
Pulsars
Magnetars