Transcript ppt

Afterglow Plateau and Energy Injection from Magnetar:
A Clue to Cosmological Standard Candles
M. Xu and Y. F. Huang
Department of Astronomy, Nanjing University, China
2011.03.07
The Prompt Activity of Gamma-Ray Bursts:
their Progenitors, Engines, and Radiation Mechanisms
Raleigh, NC
Outline
Afterglow Plateau
Energy Injection (EI) from Magnetar
LT correlation
LTE correlation
Cosmological Standard Candles
2
Canonical X-ray afterglow light curve
Zhang et al. 2006; Nousek et al. 2006
3
Energy Injection from Magnetar
Energy
Injection
Kaspi et al. 2006
Fireball
4
Afterglow and EI
EI
Xu et al. 2008, 2009
5
Phenomenological model
Willingale et al. 2007
6
LX*∝Ta*-1.06
LT correlation
Ta*=Ta/(1+z)
Dainotti et al. 2010
7
EI from Magnetar
LX*∝Ta*-1.06
Assumptions：
∝
~
~ constant
~ constant
∝
-1
Same parameters for
new born magnetars
---Cosmological
standard candles
Energy Injection from Magnetar
e + eEI
Dai 2004
Fireball
9
Relativistic wind bubble
Dai 2004
10
Einjection < EFireball
Einjection ~ EFireball
Yu & Dai, 2007
Dai 2004
EFireball ~ Einjection~ LW T
LX* is related to fireball’s energy
LX*-T*-Eγ,iso correlation
12
LX*∝Ta*-0.82Eγ,iso0.78
LTE correlation
Xu & Huang 2011
13
LT vs LTE
LT:
Log[L/10
47erg/s
r=-0.73,
H=69.7, ΩM=0.291
]=0.77[±0.14] -1.16 [±0.16] Log[T/10 s]
3
P=5.6×10-8
σint=0.85±0.097
LTE correlation is much more tight than LT correlation.
LTE:
Log[L/10
47erg/s
r=0.92,
]=0.73[±0.07] -0.82 [±0.08] Log[T/10 s]
+0.78[±0.06] Log[Eiso/10
3
]
53erg
P=1.84×10-20
σint=0.38±0.05
14
Intermediate class GRBs
LT correlation
LTE correlation
Long
IC
Dainotti et al. 2010
Xu & Huang 2011
15
Constrain the Cosmological parameters
ΩM=0.42±0.26
Xu & Huang 2011
16
Summary
Afterglow plateau might be resulted from EI
from Magnetar
LTE-correlation is much more tight than LTcorrelation
Candidates of Cosmological Standard
Candles
Thank you!
17