XRF 060218 associated with SN 2006aj

1
XRF 060218 associated with SN 2006aj

• Nature, Val 442 Aug.31 issues
• Campana et al. p.1008
• Pian et al. P. 1011
• Soderberg et al. p.1014
• Paolo et al. p.1018

2
Contents

• Gamma-ray burst (GRB) and X-ray flash (XRF)
• XRF 060218 (associated with SN 2006aj)
• Progenitor of XRF (neutron star driven?)

3
GRBs
Flash gamma-ray emissions with E1051erg
Origin.. Long soft bursts (Tgt2s)-----Type Ic SN
Short hard bursts (Tlt2s)-----merging between
compacts objects
4
XRFs
5
What origin of XRFs
The less luminosity and soft emissions because of

• off axis long GRBs
• intrinsically dimmer and softer bursts than GRBs

GRBs
VS.
XRFs
6
XRF 060218 (todays report)

• Unusually long bursts detected by Swift

7
XRF 060218
V, B, U, UVW1, UVM1, UVW2
Host galaxy at z0.033 -secondary nearby burst
8
SN2006aj

• XRF 060218 is associated with SN 2006 aj.
• SN 2006aj is type Ic (owing to a lack of hydrogen
  and helium lines)

What is the progenitor of SN 2006aj???
9
Off axis GRB or intrinsically dim explosion
10

• Light curve in the radio bands will rule out the
  off axis GRB model, which predicts much bright
  radio emissions .

XRF 060218
Intrinsically dim explosion
11
Neutron star driven XRF

• Spectra of SN 2006aj can be fitted by synthetic
  model with M25Solar mass
• Neutron star driven?

12
Harrison et al.(99)
Break time ? Jet angle