ON THE PUZZLING HIGH-ENERGY PULSATIONS OF THE ENERGETIC RADIO-QUIET γ-RAY PULSAR J1813–1246
Abstract
In this study, we have analyzed the new deep XMM-Newton and Chandra observations of the energetic, radio-quiet pulsar J1813–1246. The X-ray spectrum is nonthermal, very hard, and absorbed. Based on spectral considerations, we propose that J1813 is located at a distance further than 2.5 kpc. J1813 is highly pulsed in the X-ray domain, with a light curve characterized by two sharp, asymmetrical peaks, separated by 0.5 in phase. We detected no significant X-ray spectral changes during the pulsar phase. We extended the available Fermi ephemeris to five years. We found two glitches. The γ-ray light curve is characterized by two peaks, separated by 0.5 in phase, with a bridge in between and no off-pulse emission. The spectrum shows clear evolution in phase, being softer at the peaks and hardening toward the bridge. Surprisingly, both X-ray peaks lag behind the γ-ray ones by a quarter of phase. We found a hint of detection in the 30-500 keV band with INTEGRAL, which is consistent with the extrapolation of both the soft X-ray and γ-ray emission of J1813. The unique X-ray and γ-ray phasing suggests a singular emission geometry. We discuss some possibilities within the current pulsar emission models. Finally, we develop anmore »
- Authors:
-
- INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica Milano (Italy)
- NASA/Goddard Space Flight Center, Greenbelt, MD (United States). Astrophysics Science Division
- INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica Milano (Italy); Universita degli Studi dell Insubria (Italy)
- INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica Milano (Italy); Istituto Nazionale di Fisica Nucleare, Sezione di Pavia (Italy)
- Naval Research Laboratory, Washington, DC (United States). Space Science Division
- The University of Hong Kong (China). Department of Physics; University of California, Santa Cruz, CA (United States). Santa Cruz Institute for Particle Physics
- Laboratoire AIM, CEA-IRFU/CNRS/Universit Paris Diderot, Service d Astrophysique (France)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE
- Contributing Org.:
- Fermi-LAT Collaboration
- OSTI Identifier:
- 1356432
- Grant/Contract Number:
- AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The Astrophysical Journal (Online)
- Additional Journal Information:
- Journal Name: The Astrophysical Journal (Online); Journal Volume: 795; Journal Issue: 2; Journal ID: ISSN 1538-4357
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; gamma rays: stars; pulsars: general; pulsars: individual (PSR J1813–1246); stars: neutron; X-rays: stars
Citation Formats
Marelli, M., Harding, A., Pizzocaro, D., De Luca, A., Wood, K. S., Caraveo, P., Salvetti, D., Saz Parkinson, P. M., and Acero, F. ON THE PUZZLING HIGH-ENERGY PULSATIONS OF THE ENERGETIC RADIO-QUIET γ-RAY PULSAR J1813–1246. United States: N. p., 2014.
Web. doi:10.1088/0004-637X/795/2/168.
Marelli, M., Harding, A., Pizzocaro, D., De Luca, A., Wood, K. S., Caraveo, P., Salvetti, D., Saz Parkinson, P. M., & Acero, F. ON THE PUZZLING HIGH-ENERGY PULSATIONS OF THE ENERGETIC RADIO-QUIET γ-RAY PULSAR J1813–1246. United States. https://doi.org/10.1088/0004-637X/795/2/168
Marelli, M., Harding, A., Pizzocaro, D., De Luca, A., Wood, K. S., Caraveo, P., Salvetti, D., Saz Parkinson, P. M., and Acero, F. Tue .
"ON THE PUZZLING HIGH-ENERGY PULSATIONS OF THE ENERGETIC RADIO-QUIET γ-RAY PULSAR J1813–1246". United States. https://doi.org/10.1088/0004-637X/795/2/168. https://www.osti.gov/servlets/purl/1356432.
@article{osti_1356432,
title = {ON THE PUZZLING HIGH-ENERGY PULSATIONS OF THE ENERGETIC RADIO-QUIET γ-RAY PULSAR J1813–1246},
author = {Marelli, M. and Harding, A. and Pizzocaro, D. and De Luca, A. and Wood, K. S. and Caraveo, P. and Salvetti, D. and Saz Parkinson, P. M. and Acero, F.},
abstractNote = {In this study, we have analyzed the new deep XMM-Newton and Chandra observations of the energetic, radio-quiet pulsar J1813–1246. The X-ray spectrum is nonthermal, very hard, and absorbed. Based on spectral considerations, we propose that J1813 is located at a distance further than 2.5 kpc. J1813 is highly pulsed in the X-ray domain, with a light curve characterized by two sharp, asymmetrical peaks, separated by 0.5 in phase. We detected no significant X-ray spectral changes during the pulsar phase. We extended the available Fermi ephemeris to five years. We found two glitches. The γ-ray light curve is characterized by two peaks, separated by 0.5 in phase, with a bridge in between and no off-pulse emission. The spectrum shows clear evolution in phase, being softer at the peaks and hardening toward the bridge. Surprisingly, both X-ray peaks lag behind the γ-ray ones by a quarter of phase. We found a hint of detection in the 30-500 keV band with INTEGRAL, which is consistent with the extrapolation of both the soft X-ray and γ-ray emission of J1813. The unique X-ray and γ-ray phasing suggests a singular emission geometry. We discuss some possibilities within the current pulsar emission models. Finally, we develop an alternative geometrical model where the X-ray emission comes from polar cap pair cascades.},
doi = {10.1088/0004-637X/795/2/168},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 795,
place = {United States},
year = {Tue Oct 28 00:00:00 EDT 2014},
month = {Tue Oct 28 00:00:00 EDT 2014}
}
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