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The PoGO plus view on Crab off-pulse hard X-ray polarization

Chauvin, Maxime (author)
KTH,Partikel- och astropartikelfysik,AlbaNova Univ Ctr, Oskar Klein Ctr Cosmoparticle Phys, SE-10691 Stockholm, Sweden
Florén, Hans-Gustav (author)
Stockholms universitet,Institutionen för astronomi,Stockholm Univ, Dept Astron, SE-10691 Stockholm, Sweden
Friis, Mette (author)
KTH,Partikel- och astropartikelfysik,AlbaNova Univ Ctr, Oskar Klein Ctr Cosmoparticle Phys, SE-10691 Stockholm, Sweden.
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Jackson, Miranda (author)
KTH,Partikel- och astropartikelfysik
Kamae, T. (author)
Univ Tokyo, Dept Phys, Tokyo 1130033, Japan.
Kataoka, J. (author)
Waseda Univ, Res Inst Sci & Engn, Tokyo 1698555, Japan.
Kawano, T. (author)
Hiroshima Univ, Dept Phys Sci, Hiroshima 7398526, Japan.
Kiss, Mózsi, 1982- (author)
KTH,Partikel- och astropartikelfysik,AlbaNova Univ Ctr, Oskar Klein Ctr Cosmoparticle Phys, SE-10691 Stockholm, Sweden.
Mikhalev, Victor (author)
KTH,Partikel- och astropartikelfysik,AlbaNova Univ Ctr, Oskar Klein Ctr Cosmoparticle Phys, SE-10691 Stockholm, Sweden.
Mizuno, T. (author)
Hiroshima Univ, Dept Phys Sci, Hiroshima 7398526, Japan.
Tajima, H. (author)
Nagoya Univ, Inst Space Earth Environm Res, Nagoya, Aichi 4648601, Japan.
Takahashi, H. (author)
Hiroshima Univ, Dept Phys Sci, Hiroshima 7398526, Japan.
Uchida, N. (author)
Hiroshima Univ, Dept Phys Sci, Hiroshima 7398526, Japan.
Pearce, Mark, 1970- (author)
KTH,Partikel- och astropartikelfysik,AlbaNova Univ Ctr, Oskar Klein Ctr Cosmoparticle Phys, SE-10691 Stockholm, Sweden.
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 (creator_code:org_t)
2018-02-26
2018
English.
In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press. - 0035-8711 .- 1365-2966 .- 1745-3925 .- 1745-3933. ; 477:1, s. L45-L49
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • The linear polarization fraction (PF) and angle of the hard X-ray emission from the Crab provide unique insight into high-energy radiation mechanisms, complementing the usual imaging, timing, and spectroscopic approaches. Results have recently been presented by two missions operating in partially overlapping energy bands, PoGO+ (18-160 keV) and AstroSat CZTI (100-380 keV). We previously reported PoGO+ results on the polarization parameters integrated across the light curve and for the entire nebula-dominated off-pulse region. We now introduce finer phase binning, in light of the AstroSat CZTI claim that the PF varies across the off-pulse region. Since both missions are operating in a regime where errors on the reconstructed polarization parameters are non-Gaussian, we adopt a Bayesian approach to compare results from each mission. We find no statistically significant variation in off-pulse polarization parameters, neither when considering the mission data separately nor when they are combined. This supports expectations from standard high-energy emission models.

Subject headings

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
NATURVETENSKAP  -- Fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences (hsv//eng)

Keyword

instrumentation: polarimeters
methods: statistical

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