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Title: DISCOVERY OF AN ENERGETIC 38.5 ms PULSAR POWERING THE GAMMA-RAY SOURCE IGR J18490-0000/HESS J1849-000

Abstract

We report the discovery of a 38.5 ms X-ray pulsar in observations of the soft {gamma}-ray source IGR J18490-0000 with the Rossi X-ray Timing Explorer (RXTE). PSR J1849-0001 is spinning down rapidly with period derivative 1.42 x 10{sup -14} s s{sup -1}, yielding a spin-down luminosity E-dot = 9.8 x 10{sup 36} erg s{sup -1}, characteristic age {tau}{sub c}{identical_to}P/2 P-dot = 42.9 kyr, and surface dipole magnetic field strength B{sub s} = 7.5 x 10{sup 11} G. Within the INTEGRAL/IBIS error circle lies a point-like XMM-Newton and Chandra X-ray source that shows evidence of faint extended emission consistent with a pulsar wind nebula (PWN). The XMM-Newton spectrum of the point source is well fitted by an absorbed power-law model with photon index {Gamma}{sub PSR} = 1.1 {+-} 0.2, N{sub H} = (4.3 {+-} 0.6) x 10{sup 22} cm{sup -2}, and F{sub PSR}(2-10 keV) = (3.8 {+-} 0.3) x 10{sup -12} erg cm{sup -2} s{sup -1}, while the spectral parameters of the extended emission are roughly {Gamma}{sub PWN} {approx} 2.1 and F{sub PWN}(2-10 keV) {approx} 9 x 10{sup -13} erg cm{sup -2} s{sup -1}. IGR J18490-0000 is also coincident with the compact TeV source HESS J1849-000. For an assumed distance ofmore » 7 kpc in the Scutum arm tangent region, the 0.35-10 TeV luminosity of HESS J1849-000 is 0.13% of the pulsar's spin-down energy, while the ratio F(0.35-10 TeV)/F{sub PWN}(2-10 keV) {approx} 2. These properties are consistent with leptonic models of TeV emission from PWNe, with PSR J1849-0001 in a stage of transition from a synchrotron X-ray source to an inverse Compton {gamma}-ray source.« less

Authors:
;  [1]; ;  [2]
  1. Columbia Astrophysics Laboratory, Columbia University, 550 West 120th Street, New York, NY 10027 (United States)
  2. Astroparticule et Cosmologie, Universite Paris 7/CNRS/CEA, Batiment Condorcet, 75013 Paris (France)
Publication Date:
OSTI Identifier:
21560456
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 729; Journal Issue: 2; Other Information: DOI: 10.1088/2041-8205/729/2/L16; Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; EMISSION; GAMMA SOURCES; LUMINOSITY; MAGNETIC FIELDS; PULSARS; SUPERNOVA REMNANTS; X-RAY SOURCES; COSMIC RADIO SOURCES; OPTICAL PROPERTIES; PHYSICAL PROPERTIES; RADIATION SOURCES

Citation Formats

Gotthelf, E V, Halpern, J P, Terrier, R, and Mattana, F. DISCOVERY OF AN ENERGETIC 38.5 ms PULSAR POWERING THE GAMMA-RAY SOURCE IGR J18490-0000/HESS J1849-000. United States: N. p., 2011. Web. doi:10.1088/2041-8205/729/2/L16.
Gotthelf, E V, Halpern, J P, Terrier, R, & Mattana, F. DISCOVERY OF AN ENERGETIC 38.5 ms PULSAR POWERING THE GAMMA-RAY SOURCE IGR J18490-0000/HESS J1849-000. United States. doi:10.1088/2041-8205/729/2/L16.
Gotthelf, E V, Halpern, J P, Terrier, R, and Mattana, F. Thu . "DISCOVERY OF AN ENERGETIC 38.5 ms PULSAR POWERING THE GAMMA-RAY SOURCE IGR J18490-0000/HESS J1849-000". United States. doi:10.1088/2041-8205/729/2/L16.
@article{osti_21560456,
title = {DISCOVERY OF AN ENERGETIC 38.5 ms PULSAR POWERING THE GAMMA-RAY SOURCE IGR J18490-0000/HESS J1849-000},
author = {Gotthelf, E V and Halpern, J P and Terrier, R and Mattana, F},
abstractNote = {We report the discovery of a 38.5 ms X-ray pulsar in observations of the soft {gamma}-ray source IGR J18490-0000 with the Rossi X-ray Timing Explorer (RXTE). PSR J1849-0001 is spinning down rapidly with period derivative 1.42 x 10{sup -14} s s{sup -1}, yielding a spin-down luminosity E-dot = 9.8 x 10{sup 36} erg s{sup -1}, characteristic age {tau}{sub c}{identical_to}P/2 P-dot = 42.9 kyr, and surface dipole magnetic field strength B{sub s} = 7.5 x 10{sup 11} G. Within the INTEGRAL/IBIS error circle lies a point-like XMM-Newton and Chandra X-ray source that shows evidence of faint extended emission consistent with a pulsar wind nebula (PWN). The XMM-Newton spectrum of the point source is well fitted by an absorbed power-law model with photon index {Gamma}{sub PSR} = 1.1 {+-} 0.2, N{sub H} = (4.3 {+-} 0.6) x 10{sup 22} cm{sup -2}, and F{sub PSR}(2-10 keV) = (3.8 {+-} 0.3) x 10{sup -12} erg cm{sup -2} s{sup -1}, while the spectral parameters of the extended emission are roughly {Gamma}{sub PWN} {approx} 2.1 and F{sub PWN}(2-10 keV) {approx} 9 x 10{sup -13} erg cm{sup -2} s{sup -1}. IGR J18490-0000 is also coincident with the compact TeV source HESS J1849-000. For an assumed distance of 7 kpc in the Scutum arm tangent region, the 0.35-10 TeV luminosity of HESS J1849-000 is 0.13% of the pulsar's spin-down energy, while the ratio F(0.35-10 TeV)/F{sub PWN}(2-10 keV) {approx} 2. These properties are consistent with leptonic models of TeV emission from PWNe, with PSR J1849-0001 in a stage of transition from a synchrotron X-ray source to an inverse Compton {gamma}-ray source.},
doi = {10.1088/2041-8205/729/2/L16},
journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 2,
volume = 729,
place = {United States},
year = {2011},
month = {3}
}