Polarized emission from astrophysical jets: theory€¦ · Polarized emission from astrophysical...
Transcript of Polarized emission from astrophysical jets: theory€¦ · Polarized emission from astrophysical...
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Polarized emission from astrophysical jets: theory Monika MoscibrodzkaRadboud University(RU, Netherlands)
H. Falcke (RU), C. Gammie (UIUC), J. Dexter (MPE), J. Davelaar (RU) and BHC collaboration (ERC)
Ierapetra - 12 June 2017
RadioNet has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 730562
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Outline
● General Relativistic MHD models
● Modeling polarized radiation in GR
● Appearance of accreting black holes in polarized light
● Linear (circular) polarization ● Faraday rotation
● Other types of jets
● Summary
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Class of sources discussed: Low Luminosity AGN
Ho 2008
DeGasperin+2012
Mertens+2016
EHT will resolve inner 100 μas
Ichimaru 1977Narayan et al. 1994
Bla
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General relativistic MHD simulations of RIAF
Ideal-MHD in 3D
No cooling
Disk: MRI turbulence
Magnetized outflows, jets
Other models Collisionless, two-
temperature plasma, model for electron distribution function assumed
ρ
β
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Disk jets (jet sheath)
~ li
ne
of
sig
ht
Ressler, Tchekhovkoy et al. 2017: Extended GRMHD Sgr A* model
Moscibrodzka et al. 2013, 2014, 2016, 2017
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Modeling emission from GRMHD models of RIAF
● We model millimeter emission ● 43,86,230GHz-limited by the model size (larger scale jets see
e.g., C. Fromm talk)● synchrotron emission ● near horizon emission – Doppler boosts, gravitational lensing
● The goal is to constrain the model free parameters:● accretion rate , i ● spin ● Geometry of near horizon B fields
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Relativistic Polarized Radiative Transport by ray-tracing
Faraday rotation – rotates plane of linear polarization (polarization ticks)(ne,B,Te, θ, ν2)
Faraday conversion-Conversion of linear to circular polarization(ne,B,Te, θ, ν2)
Synchrotron Absorptivity (ne,B,Te, θ, ν)
Synchrotron emissivities (ne,B,Te, θ, ν)
Optical thickness – frequency dependent τ~> 1Faraday optical thickness τF>> 1 ~ 106 (equations can be stiff)
StokesPar.
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Fully covariant equations for polarized radiative transport
Relativistic Polarized Radiative Transport by ray-tracingipole
Gammie & Leung 2012Weinberg “Cosmology”
Other GR polarized codes:
Vray (Broderick 2006) Astroray (Scherbakov Huang 2011-2012)Grtrans (Dexter 2016)RAPTOR (Bronzwaer et al. 2017)
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Carefully tested in curvilinear coordinates
Relativistic Polarized Radiative Transport by ray-tracingipole
Moscibrodzka & Gammie
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LP, CP, RM (Macc) at 230 GHz [M=6x109 M
SUN,i=10°,a=0.94,Te]
Kuo et al. 2014,see talk by K. Asada
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100 GM/c2 = 0.36 masMoscibrodzka et al. 2016
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Moscibrodzka et al. 2016
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Moscibrodzka et al. 2016, Moscibrodzka, Dexter et al. 2017, and Dexter 2012
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Jet launching point
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Strong Faraday rotation/conversion
No Faraday effects
Similar effect in Sgr A* - see talk by Jimenez-Rosales
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Variability at jet launching point
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Variability at jet launching point
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Jet spine
~ li
ne
of
sig
ht
a
a
Goldreich Julian 1969Blandford Znajek 1977Beskin 1992Hirotani Okamoto 1998Levinson et al. 2011Broderick, Tchekhovkoy 2016 and others
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Jet spine
~ li
ne
of
sig
ht
a
a
Moscibrodzka et al. 2011Explicit pair creation model using GRMHD and GR RT
Goldreich Julian 1969Blandford Znajek 1977Beskin 1992Hirotani & shibata1999, Hirotani et al. 2016Levinson et al. 2011Broderick, Tchekhovkoy 2016 and others
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Jet spine
~ li
ne
of
sig
ht
a
a
Goldreich Julian 1969Blandford Znajek 1977Beskin 1992Hirotani & shibata1999, Hirotani et al. 2016Levinson et al. 2011Broderick, Tchekhovkoy 2016 and others
MM et al. 2017
Broderick Loeb 2009
Jet-spine?
Jet-sheath
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Summary
● I showed first synthetic polarized simulations of M87 jet near BH
● The largest uncertainty in models: particle content and particle acceleration (impact on image morphology and SED)
● Structure of B fields and surrounding (RM)
● Detailed comparison of all models to the EHT data ( M87, Sgr A*) in preparation by EHT collaboration
Davelaar, MM 2017