9. Fascinating observations. But how much is well understood?
... fig. 9.5.A burst model has to consider fusion reactions on the surface of the NS. The most abundant element is hydrogen from the accretion disk with 25weight % He. Hydrogen will form a surface layer which burn in a fusion process (the CNO process) and generates helium. The high surface acceleration ...
... fig. 9.5.A burst model has to consider fusion reactions on the surface of the NS. The most abundant element is hydrogen from the accretion disk with 25weight % He. Hydrogen will form a surface layer which burn in a fusion process (the CNO process) and generates helium. The high surface acceleration ...
The Ultraluminous X-ray Source in Holmberg IX and its Environment
... The two main hypotheses to explain the high luminosity of ULXs are intermediate mass black holes (IMBHs) having 102 to 105 solar masses (Colbert & Mushotzky 1999) or non-isotropic emission beamed into our line-of-sight (King et al. 2001). Here, we are interested in one of these objects, Holmberg IX ...
... The two main hypotheses to explain the high luminosity of ULXs are intermediate mass black holes (IMBHs) having 102 to 105 solar masses (Colbert & Mushotzky 1999) or non-isotropic emission beamed into our line-of-sight (King et al. 2001). Here, we are interested in one of these objects, Holmberg IX ...
PowerPoint - Chandra X
... The X-ray luminosity of the jet is L = 4.4 x 1044 erg/s, about 1.6 times as great as the luminosity of the galactic nucleus. ...
... The X-ray luminosity of the jet is L = 4.4 x 1044 erg/s, about 1.6 times as great as the luminosity of the galactic nucleus. ...
X-ray Detectors
... of a windowed gas cell, subdivided into a number of low- and highelectric field regions by some arrangement of electrodes. The signals induced on these electrodes by the motions of electrons and ions in the counting gas mixture contain information on the energies, arrival times, and interaction posi ...
... of a windowed gas cell, subdivided into a number of low- and highelectric field regions by some arrangement of electrodes. The signals induced on these electrodes by the motions of electrons and ions in the counting gas mixture contain information on the energies, arrival times, and interaction posi ...
Discovery of 7-13 HZ quasi-periodic oscillations in the new X
... We have discovered quasi-periodic oscillations (QPO) with frequencies of 7-13 Hz (see the power density spectrum) in the recently discovered X-ray transient XTE J1806-246 (IAUC 6891 ) in data obtained on May 3 1998 21:03-22:31 UT with the proportional counter array (PCA) onboard the Rossi X-ray Timi ...
... We have discovered quasi-periodic oscillations (QPO) with frequencies of 7-13 Hz (see the power density spectrum) in the recently discovered X-ray transient XTE J1806-246 (IAUC 6891 ) in data obtained on May 3 1998 21:03-22:31 UT with the proportional counter array (PCA) onboard the Rossi X-ray Timi ...
The Big Four:
... • Effects on matter/light outside the horizon – gravitational attraction of other bodies – “dark star” with mass 3M Sun • distinguish from normal star, white dwarf, neutron star ...
... • Effects on matter/light outside the horizon – gravitational attraction of other bodies – “dark star” with mass 3M Sun • distinguish from normal star, white dwarf, neutron star ...
The activities of the Astronomical Institute of the Slovak Academy of
... We studied the multi-wavelength characteristics at high spatial resolution, as well as chromospheric evaporation signatures of solar microflares. To this end, we analyzed the fine structure and mass flow dynamics in the chromosphere, transition region and corona of three homologous microflares (GOES ...
... We studied the multi-wavelength characteristics at high spatial resolution, as well as chromospheric evaporation signatures of solar microflares. To this end, we analyzed the fine structure and mass flow dynamics in the chromosphere, transition region and corona of three homologous microflares (GOES ...
What is a Satellite?
... Why satellites? • A satellite is like a scientist being sent on a research trip: the scientist must bring his or her tools, as well as food, supplies, and shelter • Space Environment • Safe • In expensive ...
... Why satellites? • A satellite is like a scientist being sent on a research trip: the scientist must bring his or her tools, as well as food, supplies, and shelter • Space Environment • Safe • In expensive ...
Hitomi Observation of the Highly Obscured High-Mass X-ray
... power-law and three gaussians to account for the fluorescence lines. Comparing the spectral parameters with those obtained from Suzaku observation in 2006 (Barragan et al. 2009, A&A, 508, 1275), the flux of continuum and line components significantly decreased in this ten years while the equivalent ...
... power-law and three gaussians to account for the fluorescence lines. Comparing the spectral parameters with those obtained from Suzaku observation in 2006 (Barragan et al. 2009, A&A, 508, 1275), the flux of continuum and line components significantly decreased in this ten years while the equivalent ...
hotstar_xrays
... was full of emission lines that contained a lot of quantitative information about the large amounts of hot gas on t Sco. ...
... was full of emission lines that contained a lot of quantitative information about the large amounts of hot gas on t Sco. ...
Solar Orbiter
... The Solar Orbiter is a planned Sun-observing satellite, under development by the European Space Agency. It is estimated to be launched in October 2018. It will be launched with an Atlas V rocket at Cape Canaveral AFS in Florida. JOURNEY TO THE SUN This will require a cruise phase lasting approximate ...
... The Solar Orbiter is a planned Sun-observing satellite, under development by the European Space Agency. It is estimated to be launched in October 2018. It will be launched with an Atlas V rocket at Cape Canaveral AFS in Florida. JOURNEY TO THE SUN This will require a cruise phase lasting approximate ...
What Are the Faint X-ray Transients Near the Galactic Center?
... Another LMXB (0.1 pc from Sgr A*) with Periodic Eclipses ...
... Another LMXB (0.1 pc from Sgr A*) with Periodic Eclipses ...
X-ray spectrometer
... sensitivity (~ 10-11 erg/cm2/s), nearing the end of its lifetime – Swift: reasonable sensitivity, quick slew, all-sky pointing, but low Earth orbit, GRBs a priority – Chandra: v. good for structure studies (extended jets), but suffers from photon pile-up for bright sources. Great for difficult IDs! ...
... sensitivity (~ 10-11 erg/cm2/s), nearing the end of its lifetime – Swift: reasonable sensitivity, quick slew, all-sky pointing, but low Earth orbit, GRBs a priority – Chandra: v. good for structure studies (extended jets), but suffers from photon pile-up for bright sources. Great for difficult IDs! ...
- Fermi Gamma-ray Space Telescope
... fluctuations would look like to scale on the real sky above the BOOMERanG balloon launch facilities ...
... fluctuations would look like to scale on the real sky above the BOOMERanG balloon launch facilities ...
DoAr21_AAS2005 - Astronomy at Swarthmore College
... One of the few PMS stars that is x-ray bright enough to produce a highquality grating spectrum, DoAr 21 is perhaps the youngest PMS star observed with the Chandra gratings. In terms of its disk properties, it is an intermediate case between the CTTS TW Hya, which has x-ray properties that have been ...
... One of the few PMS stars that is x-ray bright enough to produce a highquality grating spectrum, DoAr 21 is perhaps the youngest PMS star observed with the Chandra gratings. In terms of its disk properties, it is an intermediate case between the CTTS TW Hya, which has x-ray properties that have been ...
Father of the X-Ray
... • The most important XRay astronomy mission of the current decade is NASA’s Chandra X-Ray Observatory, which was launched on July 23, 1999. It contains four sets off nested mirrors, and is the premier X-Ray observatory that has ever been launched. ...
... • The most important XRay astronomy mission of the current decade is NASA’s Chandra X-Ray Observatory, which was launched on July 23, 1999. It contains four sets off nested mirrors, and is the premier X-Ray observatory that has ever been launched. ...
Xray_image_chain
... – Count up the number of photons that landed in each grid cell (pixel) during the observation • For a 30,000 (1/3 day) second observation, 10,000 CCD frames are obtained • Hopefully, each grid cell will contain only 1 photon per frame ...
... – Count up the number of photons that landed in each grid cell (pixel) during the observation • For a 30,000 (1/3 day) second observation, 10,000 CCD frames are obtained • Hopefully, each grid cell will contain only 1 photon per frame ...
