scholarly journals A method of calibrating effective area of focusing X-ray detector by using normal spectrum of Crab pulsar

2018 ◽  
Vol 67 (5) ◽  
pp. 050701
Author(s):  
Zhou Qing-Yong ◽  
Wei Zi-Qing ◽  
Jiang Kun ◽  
Deng Lou-Lou ◽  
Liu Si-Wei ◽  
...  
Keyword(s):  
Effective Area ◽  
Crab Pulsar ◽  
X Ray ◽  
Normal Spectrum

scholarly journals A New View on Young Pulsars in Supernova Remnants: Slow, Radio-quiet & X-ray Bright

2000 ◽  
Vol 177 ◽  
pp. 699-702 ◽  
Author(s):  
E. V. Gotthelf ◽  
G. Vasisht
Keyword(s):  
Magnetic Field ◽  
Neutron Stars ◽  
Supernova Remnants ◽  
Simple Explanation ◽  
Crab Pulsar ◽  
Radio Pulsars ◽  
Substantial Fraction ◽  
Subsequent Evolution ◽  
X Ray ◽  
Field Decay

AbstractWe propose a simple explanation for the apparent dearth of radio pulsars associated with young supernova remnants (SNRs). Recent X-ray observations of young remnants have revealed slowly rotating (P∼ 10s) central pulsars with pulsed emission above 2 keV, lacking in detectable radio emission. Some of these objects apparently have enormous magnetic fields, evolving in a manner distinct from the Crab pulsar. We argue that these X-ray pulsars can account for a substantial fraction of the long sought after neutron stars in SNRs and that Crab-like pulsars are perhaps the rarer, but more highly visible example of these stellar embers. Magnetic field decay likely accounts for their high X-ray luminosity, which cannot be explained as rotational energy loss, as for the Crab-like pulsars. We suggest that the natal magnetic field strength of these objects control their subsequent evolution. There are currently almost a dozen slow X-ray pulsars associated with young SNRs. Remarkably, these objects, taken together, represent at least half of the confirmed pulsars in supernova remnants. This being the case, these pulsars must be the progenitors of a vast population of previously unrecognized neutron stars.

Kernel density estimators applied to fast timing hard X-ray observations of the crab pulsar

1991 ◽  
Vol 11 (8) ◽  
pp. 95-99 ◽  
Author(s):  
I.R. Carstairs ◽  
A. Bazzano ◽  
A.J. Court ◽  
A.J. Dean ◽  
N.A. Dipper ◽  
...  
Keyword(s):  
Kernel Density ◽  
Crab Pulsar ◽  
X Ray ◽  
Kernel Density Estimators ◽  
Fast Timing ◽  
Density Estimators

scholarly journals In-flight calibration of Hitomi Soft X-ray Spectrometer. (3) Effective area

2018 ◽  
Vol 70 (2) ◽  
Author(s):  
Masahiro Tsujimoto ◽  
Takashi Okajima ◽  
Megan E Eckart ◽  
Takayuki Hayashi ◽  
Akio Hoshino ◽  
...  
Keyword(s):  
Effective Area ◽  
X Ray

scholarly journals X-ray spectra of the Crab pulsar and Nebula

1981 ◽  
Vol 246 ◽  
pp. 484 ◽  
Author(s):  
S. H. Pravdo ◽  
P. J. Serlemitsos
Keyword(s):  
Crab Pulsar ◽  
X Ray

ASCA Observations of White Dwarfs, Neutron Stars and Black Holes

1996 ◽  
Vol 165 ◽  
pp. 321-331
Author(s):  
H. Inoue
Keyword(s):  
Black Holes ◽  
Focal Plane ◽  
Thin Foil ◽  
Effective Area ◽  
Wide Energy Range ◽  
Ccd Cameras ◽  
X Ray ◽  
Different Types ◽  
Wide Energy ◽  
Large Effective Area

ASCA, the fourth Japanese X-ray astronomy satellite, was launched by the Institute of Space and Astronautical Science (ISAS) on 1993 February 20. ASCA is designed to be a high-capability X-ray observatory (Tanaka et al. 1994). It is equipped with nested thin-foil mirrors which provide a large effective area over a wide energy range from 0.5 to 10 keV. Two different types of detectors, CCD cameras (SIS) and imaging gas scintillation proportional counters (GIS) are employed as the focal plane instruments.

scholarly journals The Gamma-ray Large Area Space Telescope (GLAST)

2002 ◽  
Vol 187 ◽  
pp. 73-77
Author(s):  
Taro Kotani
Keyword(s):  
International Collaboration ◽  
Gamma Ray ◽  
Angular Resolution ◽  
Effective Area ◽  
Low Earth Orbit ◽  
Gamma Ray Bursts ◽  
Earth Orbit ◽  
Large Area ◽  
X Ray ◽  
Primary Instrument

AbstractGLAST, the next U.S. general gamma-ray astrophysics mission scheduled to be launched into low Earth orbit in April, 2006, for 5–10 years of operation, is described. A product of a NASA/DOE and international collaboration, the Large Area Telescope (LAT) is the primary instrument that covers the < 20 MeV to > 300 GeV band with an effective area > 8000 cm2. The angular resolution ranges from < 3.5° at 100 MeV to < 0.15° at 10 GeV. The GLAST Burst Monitor (GBM) consists of a group of NaI and BGO detectors to extend GLAST’s sensitivity to gamma-ray bursts to the < 10 keV to > 25 MeV band. GLAST’s localizations enables us to identify the X-ray, optical and radio counterparts of thousands of gamma-ray sources and to determine their nature.

scholarly journals Searching for fast extragalactic X-ray transients in Chandra surveys

2019 ◽  
Vol 487 (4) ◽  
pp. 4721-4736 ◽  
Author(s):  
G Yang (杨光) ◽  
W N Brandt ◽  
S F Zhu (朱世甫) ◽  
F E Bauer ◽  
B Luo (罗斌) ◽  
...  
Keyword(s):  
Event Rate ◽  
Large Population ◽  
Physical Nature ◽  
Effective Area ◽  
The Other ◽  
Field Of View ◽  
Stellar Objects ◽  
Large Sample ◽  
X Ray ◽  
Future Work

ABSTRACT Recent works have discovered two fast (≈10 ks) extragalactic X-ray transients in the Chandra Deep Field-South (CDF-S XT1 and XT2). These findings suggest that a large population of similar extragalactic transients might exist in archival X-ray observations. We develop a method that can effectively detect such transients in a single Chandra exposure, and systematically apply it to Chandra surveys of CDF-S, CDF-N, DEEP2, UDS, COSMOS, and E-CDF-S, totaling 19 Ms of exposure. We find 13 transient candidates, including CDF-S XT1 and XT2. With the aid of available excellent multiwavelength observations, we identify the physical nature of all these candidates. Aside from CDF-S XT1 and XT2, the other 11 sources are all stellar objects, and all of them have z-band magnitudes brighter than 20. We estimate an event rate of ${59^{+77}_{-38}\ \rm {evt\ yr^{-1}\, deg^{-2}}}$ for CDF-S XT-like transients with 0.5–7 keV peak fluxes log Fpeak ≳ −12.6 (erg cm−2 s−1). This event rate translates to ${\approx 15^{+20}_{-10}}$ transients existing among Chandra archival observations at Galactic latitudes |b| &gt; 20°, which can be probed in future work. Future missions such as Athena and the Einstein Probe with large grasps (effective area × field of view) are needed to discover a large sample (∼thousands) of fast extragalactic X-ray transients.

scholarly journals EMERGENCE OF A FILAMENTARY STRUCTURE IN THE FIREBALL FROM GRB SPECTRA

2005 ◽  
Vol 14 (01) ◽  
pp. 97-105 ◽  
Author(s):  
REMO RUFFINI ◽  
CARLO LUCIANO BIANCO ◽  
SHE-SHENG XUE ◽  
PASCAL CHARDONNET ◽  
FEDERICO FRASCHETTI ◽  
...  
Keyword(s):  
Radio Emission ◽  
Gamma Ray ◽  
Surrounding Medium ◽  
Effective Area ◽  
Gamma Ray Bursts ◽  
Moving Frame ◽  
Filamentary Structure ◽  
X Ray ◽  
Spectral Changes ◽  
Analytic Expressions

It is shown that the concept of a fireball with a definite filamentary structure naturally emerges from the analysis of the spectra of Gamma-Ray Bursts (GRBs). These results, made possible by the recently obtained analytic expressions of the equitemporal surfaces in the GRB afterglow, depend crucially on the single parameter ℛ describing the effective area of the fireball emitting the X-ray and gamma-ray radiation. The X-ray and gamma-ray components of the afterglow radiation are shown to have a thermal spectrum in the co-moving frame of the fireball and originate from a stable shock front described self-consistently by the Rankine–Hugoniot equations. Precise predictions are presented on a correlation between spectral changes and intensity variations in the prompt radiation verifiable, e.g., by the Swift and future missions. The highly variable optical and radio emission depends instead on the parameters of the surrounding medium. The GRB 991216 is used as a prototype for this model.

Sign in / Sign up

Export Citation Format

Share Document