Jun 22 2010 HKU Fermi Workshop Neutron Star Zoo radio pulsars magnetars RRATs CCOs and more Special thanks to Vicky Kaspi for some materials in this talk Overview Since the first pulsar discovered 40 yrs ago they are ID: 631836
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Slide1
Stephen C.-Y. NgMcGill University
Jun 22, 2010
HKU Fermi Workshop
Neutron Star Zoo: radio pulsars, magnetars, RRATs, CCOs, and more
Special thanks to Vicky
Kaspi
for some materials in this talk Slide2
OverviewSince the first pulsar discovered 40 yrs ago, they are
all thought to be:b
orn spinning fast in SNRswith magnetic fields
1012 Gemitting radio pulses
Jun 22, 2010
HKU Fermi WorkshopSlide3
The Zoo of Isolated NSRPP (radio pulsar)
INS (nearby old pulsar)AXP/SGR (Magnetar
)CCO (Anti-magnetar?)RRAT (Part-time pulsar)
MSP (Recycled pulsar)Jun 22, 2010
HKU Fermi Workshop
from Cupcake
Cutiees
NS
ZooSlide4
Observational PropertiesObservable
Characteristic ageSpin-down luminosity
Surface dipole field
Jun 22, 2010HKU Fermi WorkshopSlide5
P-P Diagram
Jun 22, 2010
HKU Fermi WorkshopSlide6
Radio Pulsars
Powered by rotational energy, i.e. spin-downRadio to Gamma-ray emissionPower
PWNe1500 knownCould be radio-quiet,
e.g. GemingaJun 22, 2010
HKU Fermi Workshop
NASA/CXC/SAO/
F.Seward
et al
See
Lupin
Chun-
Che
Lin ‘s talkSlide7
Rotation-Powered Pulsars
Jun 22, 2010
HKU Fermi Workshop
\
RPPsSlide8
Broadband EmissionJun 22, 2010
HKU Fermi WorkshopSlide9
EGRET pulsars
young
pulsars
discovered
using radio ephemeris
pulsars discovered in blind search
millisecond pulsars discovered using radio ephemeris
Pulses at 1/10
th
real rate
Abdo
et al./ Fermi LAT Team
See talks by
Jumpei
Takata
, K.S. Cheng and Yu Wang
31+ Gamma-ray and radio pulsars (including 8+
MSPs)
16
+ Gamma-ray only pulsars
Fermi Pulsars
HKU Fermi WorkshopSlide10
Magnetars: AXPs and SGRs
Anomalous X-ray Pulsar (AXP)Soft-Gamma Repeater (SGR)
Lx >> EP=2-12s, large P => B
1014G13 known, only 2 in radioYoung, volatileSpectacular outbursts
Jun 22, 2010
HKU Fermi Workshop
see
Yunwei
Yu’s talkSlide11
Magnetars
Jun 22, 2010
HKU Fermi Workshop
MagnetarsSlide12
MagnetarsJun 22, 2010
HKU Fermi Workshop
0-10s
0-10Myr
>10Myr
RPP
Magnetar
Newborn
Neutron
Star
Massive
StarSlide13
Giant Flare of SGR 1806-20
Dec 27, 2004100x more luminous than any Galactic transients ever seen10
8 LEdd
Jun 22, 2010
HKU Fermi Workshop
Hurley et al.
(2005)Slide14
Jun 22, 2010HKU Fermi WorkshopSlide15
Jun 22, 2010
HKU Fermi WorkshopSlide16
2009 Jan Outburst
Dust scattering rings, i.e. light echoes
=> distance
1E 1547.0-5408
ESA/
Tiengo
et al.
Swift
XMM-NewtonSlide17
High-B Rotation-Powered PSRs
Jun 22, 2010
HKU Fermi Workshop
High-B
RRPsSlide18
High-B RRPs
Name
P (s)
Pdot
B (G)
D (
kpc
)
J1119-6127
0.4
4.1e-12
4.1e13
8.4
J1718-3718
3.4
1.6e-12
7.4e13
4.9
J1734-3333
1.2
2.3e-12
5.2e13
7.4
J1814-1744
4.0
7.4e-13
5.5e13
9.8
J1819-1458
4.3
5.7e-13
5.0e13
3.6
J1846-0258
0.3
7.1e-12
4.8e13
6
J1847-0130
6.7
1.3e-12
9.3e13
8.4
Jun 22, 2010
HKU Fermi WorkshopSlide19
PSR J1846-0258
0.3 s X-ray pulsar
in SNR Kes 75
B = 5x1013GYoungest pulsar: 884 yr
No radio emission
Jun 22, 2010
HKU Fermi Workshop
NASA/CXC/GSFC/
F.P.Gavriil
et al.Slide20
Jun 22, 2010
Gavriil
et
al. (2008)
2006
2000
Magnetar
-like
Outbursts
in a
Rotation-Powered
PulsarSlide21
Chandra Observations of Kes 75
Jun 22, 2010
HKU Fermi Workshop
2000
2006
2009
Livingstone, SN,
Kaspi
, in prep.Slide22
Rotating Radio Transients (RRATs)
Sporadic radio pulse emitters12 knownLong periods
Bright in radioGiant pulses?Intermittent or nulling
pulsars?Nearly dead pulsars? Asteroid belts?Jun 22, 2010
HKU Fermi Workshop
T
2-30ms
4m-3h
McLaughlin et al. 2007
Rea et al. 2009Slide23
Rotating RAdio Transients
Jun 22, 2010
HKU Fermi Workshop
RRATsSlide24
Isolated Neutron Stars
7+1 known (Magnificent Seven + Calvera)Nearby (most < 1kpc)
Inferred B-fields 1-3x1013GNo radio emission
Believed to be old pulsarsJun 22, 2010
HKU Fermi WorkshopSlide25
Isolated Neutron Stars
Jun 22, 2010
HKU Fermi Workshop
INSsSlide26
Central Compact Objects
7 known
Found near the center of SNRs => youngNo radio, IR, optical counterparts
Isolated, no PWNThermal X-ray spectrum, hot temp small RCas A: Chandra first light
Jun 22, 2010
HKU Fermi Workshop
NASA/CXC/SAO/
D.Patnaude
et al.
First CCOSlide27
CCOs as “Anti-Magnetars
”?
Only 3 CCOs show X-ray pulsations:
CCO in PKS 1209-52: B<3x1011G (Gotthelf & Halpern
2007)
CCO in
Puppis
A: B<10
12G
(Gotthelf &
Halpern 2009)CCO in Kes 79: B=3x10
10
G!
(
Halpern
&
Gotthelf
2010)
Jun 22, 2010
Halpern & Gotthelf (2010) CCOs as “Anti-
magnetars
”, born with weak
B
?Slide28
Central Compact Objects
Jun 22, 2010
HKU Fermi Workshop
CCOsSlide29
Millisecond Pulsars
P=0.001s – 0.01sAge > 1MyrSpun up by accretion
Recycled pulsarsFermi detection
Jun 22, 2010HKU Fermi Workshop
See talks by David
Hui
and Yi Jung Yang Slide30
Millisecond Second PSRs
Jun 22, 2010
HKU Fermi Workshop
MSPsSlide31
Unification?Jun 22, 2010
Log Age
Log B
2
6
4
10
8
8
10
12
14
Millisecond pulsars
Magnetars
Radio Pulsars
RRATs
“anti-
magnetars
”
Isolated Neutron Stars
Kaspi
(2010)Slide32
Summary
RPP (radio pulsar)
INS (nearby old pulsar)
AXP/SGR (Magnetar)CCO (Anti-magnetar?)RRAT (Part-time pulsar)
MSP (Recycled pulsar)
Jun 22, 2010
HKU Fermi Workshop