Endre søk
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Measuring energy dependent polarization in soft gamma-rays using compton scattering in PoGOLite
KTH, Skolan för teknikvetenskap (SCI), Fysik.
KTH, Skolan för teknikvetenskap (SCI), Fysik, Partikel- och astropartikelfysik.ORCID-id: 0000-0002-9769-8016
Vise andre og tillknytning
2007 (engelsk)Inngår i: Astroparticle physics, ISSN 0927-6505, E-ISSN 1873-2852, Vol. 28, nr 3, s. 327-337Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Linear polarization in X-and gamma-rays is an important diagnostic of many astrophysical sources, foremost giving information about their geometry, magnetic fields, and radiation mechanisms. However, very few X-ray polarization measurements have been made, and then only mono-energetic detections, whilst several objects are assumed to have energy dependent polarization signatures. In this paper, we investigate whether detection of energy dependent polarization from cosmic sources is possible using the Compton technique, in particular with the proposed PoGOLite balloon-experiment, in the 25-100 keV range. We use Geant4 simulations of a PoGOLite model and input photon spectra based on Cygnus X-1 and accreting magnetic pulsars (100 mCrab). Effective observing times of 6 and 35 h were simulated, corresponding to a standard and a long duration flight, respectively. Both smooth and sharp energy variations of the polarization are investigated and compared to constant polarization signals using chi-square statistics. We can reject constant polarization, with energy, for the Cygnus X-1 spectrum (in the hard state), if the reflected component is assumed to be completely polarized, whereas the distinction cannot be made for weaker polarization. For the accreting pulsar, constant polarization can be rejected in the case of polarization in a narrow energy band with at least 50% polarization, and similarly for a negative step distribution from 30% to 0% polarization.

sted, utgiver, år, opplag, sider
Elsevier, 2007. Vol. 28, nr 3, s. 327-337
Emneord [en]
polarization, X-rays, gamma-rays, compton technique, PoGOLite, Geant4, simulations, x-ray, crab-nebula, accretion disks, beam test, hxd-ii, emission, detector, radiation, flux, polarimeter
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-17106DOI: 10.1016/j.astropartphys.2007.06.006ISI: 000250887400007Scopus ID: 2-s2.0-35248829556OAI: oai:DiVA.org:kth-17106DiVA, id: diva2:335149
Merknad

QC 20100525

Tilgjengelig fra: 2010-08-05 Laget: 2010-08-05 Sist oppdatert: 2017-12-12bibliografisk kontrollert

Open Access i DiVA

Fulltekst mangler i DiVA

Andre lenker

Forlagets fulltekstScopus

Personposter BETA

Axelsson, MagnusRyde, FelixPearce, MarkKiss, Mószi

Søk i DiVA

Av forfatter/redaktør
Axelsson, MagnusEngdegard, OlleRyde, FelixPearce, MarkKiss, MósziBettolo, C. MariniCarlson, PerKlamra, Wlodzimierz
Av organisasjonen
I samme tidsskrift
Astroparticle physics

Søk utenfor DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric

doi
urn-nbn
Totalt: 158 treff
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf