hete- 2 observations of the extremely soft x-ray flash xrf 020903 liang jau-shian institute of...
Post on 22-Dec-2015
217 views
TRANSCRIPT
![Page 1: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/1.jpg)
HETE- 2 OBSERVATIONS OF THE EXTREMELY
SOFT X-RAY FLASH XRF 020903
Liang Jau-shianInstitute of Physics, NTHU
![Page 2: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/2.jpg)
Introduction The Vela satellites
• The discovery of GRB was published in the year 1973.
![Page 3: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/3.jpg)
IPN (Interplanetary Network)
• 1980s• Helios 2, Pioneer Venus Orbiter, Intern
ational Sun-Earth Explorer, Venera 11, Venera 12, the Earth orbiter Prognoz 7
![Page 4: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/4.jpg)
The Compton Gamma-Ray Observatory
• April 1991• The Burst and Transient Source Exper
iment (BATSE) (10keV ~ MeV)
![Page 5: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/5.jpg)
![Page 6: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/6.jpg)
Observational properties
• GRB light curves
![Page 7: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/7.jpg)
Durations
![Page 8: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/8.jpg)
Classes of Bursts
duration/fluence/spectrum• Long/bright/soft bursts (59%)• Short/faint/hard bursts (23%)• Intermediate (2-5 s)/intermediate/soft
busts (18%)
![Page 9: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/9.jpg)
GRB energy spectra
• Range: 1keV-18GeV
![Page 10: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/10.jpg)
The Band function
),exp()100
()(0E
E
keV
EAENE
,)100
)(exp(100
)( 0
keV
E
keV
EA
breakEEE 0)(
breakEEE 0)(
1~
)2( 0
EEpeak Epeak is the energy of the peak ofSpectrum.
F
![Page 11: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/11.jpg)
![Page 12: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/12.jpg)
XRF
• no gamma ray counterpart• The XRF spectra are also well
described by the Band function.
![Page 13: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/13.jpg)
• X-ray rich GRB : Epeak < 50keV• XRF : Epeak at a few keV
![Page 14: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/14.jpg)
XRF 020903
Observations• HETE-2• the French Gamma Telescope (
FREGATE) • the wide-field X-ray monitor (WXM) • the soft X-ray cameras (SXC)
![Page 15: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/15.jpg)
French Gamma Telescope
![Page 16: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/16.jpg)
Wide Field X-ray Monitor
![Page 17: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/17.jpg)
Soft X-ray Camera
![Page 18: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/18.jpg)
![Page 19: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/19.jpg)
Temporal properties
• Two peaks: 2-5 and 5-10 keV• No significant flux above 10 keV• The duration of the burst is longer in t
he lower energy band. this trend is similar to long bright G
RBs.
![Page 20: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/20.jpg)
![Page 21: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/21.jpg)
![Page 22: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/22.jpg)
Spectrum
![Page 23: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/23.jpg)
![Page 24: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/24.jpg)
![Page 25: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/25.jpg)
![Page 26: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/26.jpg)
The constrained Band function method
Result:• Best-fit value Epeak = 2.7 keV• 1.1 keV < Epeak < 3.6keV with 68% prob
ability• Epeak < 5.0 keV with 99.7% probability
![Page 27: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/27.jpg)
![Page 28: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/28.jpg)
![Page 29: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/29.jpg)
Discussion• XRF 020903 is an XRF and not a type I X-ray b
urst• The observes spectrum of XRF 020903 were
not the redshifted spectrum of a typical GRB.• The properties of XRF 020903 are consistent
with the relation between S7-30 and S30-400 found by Barraud et al.(2003)
• Figures 6-8 provide evidence that XRFs, X-ray rich GRBs, and GRBs from a continuum and are therefore the same phenomenon.
![Page 30: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/30.jpg)
![Page 31: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/31.jpg)
![Page 32: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/32.jpg)
![Page 33: HETE- 2 OBSERVATIONS OF THE EXTREMELY SOFT X-RAY FLASH XRF 020903 Liang Jau-shian Institute of Physics, NTHU](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d805503460f94a63f8f/html5/thumbnails/33.jpg)
Thank you