Long term spectral variability in the soft gamma-ray repeater SGR 1900+14

By A. Tiengo, P. Esposito, S. Mereghetti, L. Sidoli, D. Götz, M. Feroci, R. Turolla, S. Zane, G. Israel, Luigi Stella and 1 more. 2006

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Abstract We present a systematic analysis of all the BeppoSAX data of SGR1900+14. The observations spanning five years show that the source was brighter than usual on two occasions: ∼20 days after the August 1998 giant flare and during the 105 s long X-ray afterglow following the April 2001 intermediate flare. In the latter case, we explore the possibility of describing the observed short term spectral evolution only with a change of the temperature of the blackbody component. In the only BeppoSAX observation performed before the giant flare, the spectrum of the SGR1900+14 persistent emission was significantly harder and detected also above 10 keV with the PDS instrument. In the last BeppoSAX observation (April 2002) the flux was at least a factor 1.2 below the historical level, suggesting that the source was entering a quiescent period.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/55c5213465e94330bac9549c9b7c01f0e62d9a39

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Synchrotron Self-Compton Analysis of TeV X-Ray-Selected BL Lacertae Objects (2008, methodology): “Blazar modeling has generally concentrated on leptonic processes to model simultaneous multi-wavelength data (e.g., Ghisellini & Madau 1996; Li & Kusunose 2000; Böttcher & Chiang 2002; Böttcher et al. 2002; Joshi & Böttcher 2007).”
THE THIRD CATALOG OF ACTIVE GALACTIC NUCLEI DETECTED BY THE FERMI LARGE AREA TELESCOPE (2015, background): “The large fraction of HSPs in this sample is not surprising, as the detection of LSPs and ISPs in the hard X-ray band is hampered by their SEDs exhibiting a valley between the low- and high-energy humps in this band (see Böttcher 2007).”
Canonical high power blazars (2009, background): “…one resulting from cascades initiated ⋆ Email: gabriele.ghisellini@brera.inaf.it by ultra–relativistic protons (Mannheim 1993; Mücke et al. 2003; Böttcher 2007); iii) Ultrarelativistic protons emit by the proton– synchrotron process at high energies (Aharonian 2000; Mücke & Protheroe…”
Opacity in compact extragalactic radio sources and its effect on astrophysical and astrometric studies (2008, methodology): “Broad-band modeling of blazar spectral energy distribution supports this hypothesis (see, e.g., recent review by Böttcher 2007).”
BRIGHT ACTIVE GALACTIC NUCLEI SOURCE LIST FROM THE FIRST THREE MONTHS OF THE FERMI LARGE AREA TELESCOPE ALL-SKY SURVEY (2009, background): “…dominant radiation process;745 self-Compton scattering of the jet electron’s synchrotron emission in the case of BL Lac objects,746 and Compton scattering of external radiation fields in the case of FSRQs if leptonic processes747 dominate the radiation output (recently reviewed in Böttcher 2007).”
Reconnection-driven plasmoids in blazars: fast flares on a slow envelope (2012, background): “Blazar variability on timescales ranging from hours to decades has been commonly observed at various wavelengths of the electromagnetic spectrum (see, e.g., Böttcher 2007).”
FROM THE BLAZAR SEQUENCE TO THE BLAZAR ENVELOPE: REVISITING THE RELATIVISTIC JET DICHOTOMY IN RADIO-LOUD ACTIVE GALACTIC NUCLEI (2011, background): “The typical blazar spectrum exhibits a double peak (in νFν), attributed to synchrotron and inverse Compton (IC) radiation from the relativistic jet, which dominates in blazars due to the alignment of the jet axis near to our line-of-sight (for a review of leptonic blazar models, see Böttcher 2007).”
CONSTRAINING EMISSION MODELS OF LUMINOUS BLAZAR SOURCES (2009, background): “…directly accelerated within the jet (and producing the observed synchrotron continuum), synchrotron radiation of pair cascades powered by hadronic processes, and synchrotron emission of ultra-high-energy protons and muons (see reviews by Sikora & Madejski 2001; Levinson 2006; Böttcher 2007).”