Outline What are pulsar wind nebulae? Physical properties and
evolution Why study PWNe? Common TeV sources, particle accelerators
Multiwavelength observations of PWNe Broadband SED Surprise from
Fermi: Crab flaring FAN 4, Jul 9 2013Stephen Ng
Slide 3
Pulsar Winds Where does pulsar rotational energy go? >10 35
erg/s < 10% in radiation (mostly -rays) > 90% in pulsar winds
FAN 4, Jul 9 2013Stephen Ng Credit: D. Page
Slide 4
Pulsar Wind FAN 4, Jul 9 2013Stephen Ng Credit:
CXC/D.Berry
Slide 5
Termination Shock FAN 4, Jul 9 2013Stephen Ng Termination shock
c c/3 Free -streaming pulsar wind Ejecta/ISM Credit: P. Slane
Shocked pulsar wind Pulsar wind nebulae: broadband synchrotron
bubbles (see reviews by Gaensler & Slane 2006; Cheng 2009)
Gaensler & Slane (2006)
Slide 6
Pulsar Wind Nebula Stephen NgFAN 4, Jul 9 2013
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NASA/CXC/ESA/2MASS/NRAO Broadband Emission FAN 4, Jul 9
2013Stephen Ng
Slide 8
Crab Nebula FAN 4, Jul 9 2013 Abdo et al. (2010) Synchrotron IC
Fermi LAT
Slide 9
Why study PWNe? Relativistic shock physics Cosmic ray
acceleration Important TeV sources FAN 4, Jul 9 2013Stephen Ng
Sironi & Spitkovsky (2011)
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Why study PWNe? Relativistic shock physics Cosmic ray
acceleration Important TeV sources FAN 4, Jul 9 2013Stephen Ng
Aguilar et al. (2013) e + excess: dark matter decay? Or
pulsars/PWNe?
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Why study PWNe Relativistic shock physics Cosmic ray
acceleration Important TeV sources FAN 4, Jul 9 2013Stephen Ng 35
TeV PWNe: largest group, ~1/4 identified TeV sources
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PWN Evolution FAN 4, Jul 9 2013Stephen Ng van der Swaluw et al.
(2003)
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Free Expansion FAN 4, Jul 9 2013Stephen Ng van der Swaluw et
al. (2003)
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Axisymmetric Structure FAN 4, Jul 9 2013Stephen Ng
CXC/D.BerryLyubarsky (2002)
Torus Modelling CrabVelaB1706-44 J2221+6114 J1930+1852 /
G54.1+0.3 B0540-69J0205+6449 / 3C58 J0537-6910 / N157B B1800-21
J2021+3651 J1833+1034 / G21.5-0.9 J1124-5916 / G292.0+1.8 Stephen
Ng Ng & Romani (2004; 2008) FAN 4, Jul 9 2013
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Hand of God: FAN 4, Jul 9 2013Stephen Ng Aharonian et al.
(2005) HESS TeV MSH 1552 / PSR B150958 NASA/CXC/SAO/Slane et al.
Chandra
Slide 18
Hand of God: FAN 4, Jul 9 2013Stephen Ng MSH 1552 / PSR B150958
NASA/CXC/SAO/Slane et al. Chandra Radio Ng et al. (2013,in
prep.)
Slide 19
Free Expansion FAN 4, Jul 9 2013Stephen Ng van der Swaluw et
al. (2003)
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Reverse-Shock Interaction FAN 4, Jul 9 2013Stephen Ng van der
Swaluw et al. (2003)
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NASA/PSU/Pavlov Vela X Stephen Ng Aharonian et al. (2006) TeV
Abdo et al. (2010) Fermi Mattana et al. (2011) NASA/SAO/CXC
X-rays
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G327.11.1 FAN 4, Jul 9 2013Stephen Ng Acero et al. (2012) TeV
Temim et al. (2009) Radio + X-ray Ng et al. (2013, in prep.) Radio
preliminary No Fermi Detection
Slide 23
Bow Shock FAN 4, Jul 9 2013Stephen Ng van der Swaluw et al.
(2003)
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Bow Shocks Supersonic motion in the ISM bow shocks Stephen Ng
CXC/Weiss ISM ram pressure Pulsar wind pressure FAN 4, Jul 9
2013
Slide 25
The Frying Pan G315.90.0 / PSR J14375959 ~ 2000 km/s Longest
pulsar tail > 20pc FAN 4, Jul 9 2013Stephen Ng Ng et al. (2012
)
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PSR J15095850 / G319.90.7 Ng et al. (2010) FAN 4, Jul 9
2013Stephen Ng Kargaltsev et al. (2008); Ng et al. (2010) X-ray +
Radio Radio
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Multiwavelength Studies FAN 4, Jul 9 2013Stephen Ng Crab PWN
Abdo et al. (2010) Synchrotron IC
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Multiwavelength Studies FAN 4, Jul 9 2013Stephen Ng Abdo et al.
(2010) MSH 15 52 / PSR B1509 58
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1D Modelling FAN 4, Jul 9 2013Stephen Ng Gelfand et al.
(2009)
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Time Variability FAN 4, Jul 9 2013Stephen Ng
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Crab Nebula: A Standard Candle? Cospar 7/16/2012Stephen Ng
Wilson-Hodge et al. (2011)
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Time Variability FAN 4, Jul 9 2013Stephen Ng
NASA/ASU/Hester
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Crab PWN FAN 4, Jul 9 2013 NASA/ASU/Hester Stephen Ng
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Vela Jet FAN 4, Jul 9 2013Stephen Ng NASA/CXC/PSU/Pavlov et
al.
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Vela Jet FAN 4, Jul 9 2013Stephen Ng Durant et al. (2013)
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Ng et al. (2008); Livingstone, Ng et al. (2011) PSR J1846 0258
/ Kes 75 FAN 4, Jul 9 2013 200020062009 Stephen Ng
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Crab -ray Flares FAN 4, Jul 9 2013Stephen Ng
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Crab Flares FAN 4, Jul 9 2013Stephen Ng Striani et al.
(2013)
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2013 Mar Flare FAN 4, Jul 9 2013Stephen Ng Striani et al.
(2013); Tavani et al. (2013)
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Flare Spectrum FAN 4, Jul 9 2013Stephen Ng Striani et al.
(2013)
Slide 41
Flare Spectrum FAN 4, Jul 9 2013Stephen Ng Weisskopf et al.
(2013)
Slide 42
Summary What are pulsar wind nebulae? Physical properties and
evolution Why study PWNe? Common TeV sources, particle accelerators
Multiwavelength observations of PWNe Broadband SED Surprise from
Fermi: Crab flaring FAN 4, Jul 9 2013Stephen Ng