NEW NEWS today

1
NEW NEWS today

• Tails of Geminga

2
Comet-Like Trail on a Pulsar

• Dec 27, 2005 - A team of Italian astronomers have
  discovered that a pulsar racing through the Milky
  Way has a comet-like trail blazing behind it. The
  object is called Geminga, and it was previously
  found to have twin jets of material blasting from
  its poles. This new, longer tail, was uncovered
  by studying data archived by NASA's Chandra X-Ray
  Observatory. Geminga is only 500 light-years away
  from Earth, and moving quickly across our field
  of view giving astronomers a unique opportunity
  to study such an exotic object.

Composite Image of Geminga. Image credit
XMM-Newton
3
Discovery of the Binary Pulsar PSR B1259-63 in
Very-High-Energy Gamma Rays around Periastron
with H.E.S.SAharonian, F. et al., Oct 2005, AA

• ??? Hsu Pei-Chun
• Institute of Astronomy, NTHU

4
Observation

• H.E.S.S.
• February to June 2004
• binary system PSR B1259-63/SS 2883
  r 1013 cm (periastron) P 3.4 years
  d 1.5 kpc

5
Spectrum
6
Light curve
7
The orbit of PSR B1259-63
8
discussion

• B 1G
• Acceleration happens very near the pulsar ?

9
reference

• Astronomy and Astrophysics, Volume 442, Issue 1,
  October IV 2005, pp.1-10

10
The H.E.S.S. project an Array of Imaging
Atmospheric Cherenkov Telescopes

• High Energy Stereoscopic System
• for the investigation of cosmic gamma rays in the
  100 GeV energy range
• located in Namibia (23o16'18'' S, 16o30'00'' E,
  at 1800 m asl. )

11
(No Transcript)
12
(No Transcript)
13
(No Transcript)
14
(No Transcript)