afterglow plateau and energy injection from magnetar: a clue to cosmological standard candles
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
Afterglow Plateau and Energy Injection from Magnetar:A Clue to Cosmological Standard Candles
M. Xu and Y. F. HuangDepartment 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
3Zhang et al. 2006; Nousek et al. 2006
Energy Injection from Magnetar
4
Kaspi et al. 2006 Fireball
Energy Injection
Afterglow and EI
5
EI
Xu et al. 2008, 2009
Phenomenological model
6Willingale et al. 2007
LT correlation
7Dainotti et al. 2010
Ta*=Ta/(1+z)
LX*∝ Ta
*-1.06
EI from Magnetar
Assumptions:
∝~
~ constant~ constant
∝ -1Same parameters for new born magnetars---Cosmological standard candles
LX*∝ Ta
*-1.06
Energy Injection from Magnetar
9Fireball
EI
Dai 2004
e+e-
Relativistic wind bubble
10Dai 2004
Yu & Dai, 2007
Einjection < EFireball
Einjection ~ EFireball
12
EFireball ~ Einjection~ LW T
Dai 2004
LX* is related to fireball’s energy
LX*-T*-Eγ,iso correlation
LTE correlation
13Xu & Huang 2011
LX*∝ Ta
*-0.82Eγ,iso0.78
r=-0.73, P=5.6×10-8
LT: Log[L/1047erg/s]=0.77[±0.14] -1.16 [±0.16] Log[T/103s]
r=0.92, P=1.84×10-20
LTE: Log[L/1047erg/s]=0.73[±0.07] -0.82 [±0.08] Log[T/103s] +0.78[±0.06] Log[Eiso/1053erg]
H=69.7, ΩM=0.291
σint=0.85±0.097
σint=0.38±0.05
LT vs LTE
LTE correlation is much more tight than LT correlation.
14
Intermediate class GRBs
15
Xu & Huang 2011Dainotti et al. 2010
Long
IC
LT correlation LTE correlation
Constrain the Cosmological parameters
16Xu & Huang 2011
ΩM=0.42±0.26
Summary
Afterglow plateau might be resulted from EI from Magnetar
LTE-correlation is much more tight than LT-correlation
Candidates of Cosmological Standard Candles
17
Thank you!