https://tel.archives-ouvertes.fr/file/index/docid/1058049/filename/HOU_XIAN_2013.pdf
... be a graduate student working on Fermi gamma-ray pulsars in the Astroparticle group in CENBG, and for having accompanied me in these three years with his fruitful instructive guidance in my work. I appreciate also his American humor and his optimistic attitude for the life, which have brought me hap ...
... be a graduate student working on Fermi gamma-ray pulsars in the Astroparticle group in CENBG, and for having accompanied me in these three years with his fruitful instructive guidance in my work. I appreciate also his American humor and his optimistic attitude for the life, which have brought me hap ...
Discovery and Study of Exotic Radio Pulsars Jason William Thomas
... imaging and timing of PSR J2021+3651 with the Chandra observatory revealed a pulsar wind nebula whose morphology is reminiscent of the equatorial tori seen around some young pulsars, along with thermal emission from an embedded point source (kT∞ = 0.15±0.02 keV). An observation in continuousclocking ...
... imaging and timing of PSR J2021+3651 with the Chandra observatory revealed a pulsar wind nebula whose morphology is reminiscent of the equatorial tori seen around some young pulsars, along with thermal emission from an embedded point source (kT∞ = 0.15±0.02 keV). An observation in continuousclocking ...
Dust in historical Galactic Type Ia supernova remnants with Herschel
... Morgan & Edmunds 2003; Dwek, Galliano & Jones 2007). Although recent work by Jones & Nuth (2011) suggest that the dustbudget problem is not as problematic as previous works suggest given the uncertainties in mass-loss rates and the efficiencies of dust formation in stellar winds, it is clear that si ...
... Morgan & Edmunds 2003; Dwek, Galliano & Jones 2007). Although recent work by Jones & Nuth (2011) suggest that the dustbudget problem is not as problematic as previous works suggest given the uncertainties in mass-loss rates and the efficiencies of dust formation in stellar winds, it is clear that si ...
MULTIFREQUENCY VLBI STUDIES OF COMPACT EXTRAGALACTIC JETS by
... In this doctoral thesis, multifrequency very long baseline interferometry (VLBI) observations of compact relativistic jets in active galactic nuclei are presented and analysed. Particularly, spectra of emission features in the parsec scale jet of the nearby quasar 3C 273 are measured by using simult ...
... In this doctoral thesis, multifrequency very long baseline interferometry (VLBI) observations of compact relativistic jets in active galactic nuclei are presented and analysed. Particularly, spectra of emission features in the parsec scale jet of the nearby quasar 3C 273 are measured by using simult ...
The XMM-Newton Bright Serendipitous Survey
... These two problems often limit the final scientific results that are based on the optical classification of medium/deep surveys. On the contrary, bright surveys offer the important possibility of obtaining a reliable optical classification for virtually all (with some exceptions, as discussed in the ...
... These two problems often limit the final scientific results that are based on the optical classification of medium/deep surveys. On the contrary, bright surveys offer the important possibility of obtaining a reliable optical classification for virtually all (with some exceptions, as discussed in the ...
The Lake Baikal Three Messenger Conference
... – TeV pulsed emission from the Crab pulsar detected by MAGIC Presenters: GALINDO, Daniel – MAGIC observations under extreme conditions Presenters: FRUCK, Christian – The future of gamma-ray astronomy Presenters: KNÖDLSEDER, Jürgen – Lunch – Perspectives for Gamma Astronomy at very high energy (E > 1 ...
... – TeV pulsed emission from the Crab pulsar detected by MAGIC Presenters: GALINDO, Daniel – MAGIC observations under extreme conditions Presenters: FRUCK, Christian – The future of gamma-ray astronomy Presenters: KNÖDLSEDER, Jürgen – Lunch – Perspectives for Gamma Astronomy at very high energy (E > 1 ...
Accretion Power in Astrophysics, Third Editiion
... the shift in attitude over active galaxies and quasars: the view that accretion is the energy source is now effectively standard, and the emphasis is much more on close comparison of observation and theory. This change, and the less spectacular but still profound one which has occurred in the study o ...
... the shift in attitude over active galaxies and quasars: the view that accretion is the energy source is now effectively standard, and the emphasis is much more on close comparison of observation and theory. This change, and the less spectacular but still profound one which has occurred in the study o ...
11115002
... studied in details to explore the implications in MHD instability scenarios etc[12]. After observing the Vela Nebula with advanced CCD Imagining Spectrometer (ACIS) via the Chandra X-ray Observatory, three observational studies have been penned down which were performed in July 2009 and eight more f ...
... studied in details to explore the implications in MHD instability scenarios etc[12]. After observing the Vela Nebula with advanced CCD Imagining Spectrometer (ACIS) via the Chandra X-ray Observatory, three observational studies have been penned down which were performed in July 2009 and eight more f ...
Massive Disruptions in the Cool Core of MACS J1931.8-2634 Steven Ehlert
... Turning the Cooling Rate up to 1000 ...
... Turning the Cooling Rate up to 1000 ...
optimizing the performance of as-manufactured grazing incidence x
... The field of X-ray astronomy is only forty (43) years old, and grazing incidence X-ray telescopes have only been conceived and designed for a little over fifty (50) years. The Wolter Type I design is particularly well suited for stellar astronomical telescopes (very small field-ofview). The first or ...
... The field of X-ray astronomy is only forty (43) years old, and grazing incidence X-ray telescopes have only been conceived and designed for a little over fifty (50) years. The Wolter Type I design is particularly well suited for stellar astronomical telescopes (very small field-ofview). The first or ...
... The Enhanced Resolution Imager and Spectrograph (ERIS) is the new Adaptive Optics based instrument for ESO’s VLT aiming at replacing NACO and SINFONI to form a single compact facility with AO fed imaging and integral field unit spectroscopic scientific channels. ERIS completes the instrument suite a ...
Cosmic Rays
... (arguments not valid for highest energies: - low contribution to 0 production - can escape/enter galactic field ==> highest energy CR probably extragal.) Graz, 29.Nov.2007 ...
... (arguments not valid for highest energies: - low contribution to 0 production - can escape/enter galactic field ==> highest energy CR probably extragal.) Graz, 29.Nov.2007 ...
The Emission Line Spectrum of Active Galactic
... average black-hole-to-bulge mass ratio is 0.0003 for AGNs (Wandel 1999) while it is 20 times larger for bright QSOs (Laor 1998). Despite intensive studies, the BLR is still poorly understood. It is now widely believed that accretion of gas into a central supermassive BH lies at the heart of the phen ...
... average black-hole-to-bulge mass ratio is 0.0003 for AGNs (Wandel 1999) while it is 20 times larger for bright QSOs (Laor 1998). Despite intensive studies, the BLR is still poorly understood. It is now widely believed that accretion of gas into a central supermassive BH lies at the heart of the phen ...
Full text - UvA/FNWI - University of Amsterdam
... explains QPOs observed in neutron star low mass X-ray binaries at frequencies of a few tens of Hz by the nodal precession of the orbits at the inner disk edge at a precession frequency, νLT , identical to the Lense-Thirring precession of a test particle orbit. A quadratic relation between νLT and th ...
... explains QPOs observed in neutron star low mass X-ray binaries at frequencies of a few tens of Hz by the nodal precession of the orbits at the inner disk edge at a precession frequency, νLT , identical to the Lense-Thirring precession of a test particle orbit. A quadratic relation between νLT and th ...
SN 2006gy: DISCOVERY OF THE MOST LUMINOUS
... galaxy center. Images at three wave bands (J, H, and Ks ) were obtained on 2006 November 4 using the AO system in LGS mode (Lloyd et al. 2000; Max et al. 1997) on the Shane 3 m telescope at Lick Observatory. The total integration time in each band was 480 s, accumulated over eight exposures. The nat ...
... galaxy center. Images at three wave bands (J, H, and Ks ) were obtained on 2006 November 4 using the AO system in LGS mode (Lloyd et al. 2000; Max et al. 1997) on the Shane 3 m telescope at Lick Observatory. The total integration time in each band was 480 s, accumulated over eight exposures. The nat ...
X-ray binaries in the Milky Way and other galaxies
... 6.8. Dependence of most probable value on number of the sources. . . . . . . . 6.9. Ratio of most probable value of total luminosity to its expectation value versus number of sources. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.10. Probability distribution of the maximum luminosity. . . ...
... 6.8. Dependence of most probable value on number of the sources. . . . . . . . 6.9. Ratio of most probable value of total luminosity to its expectation value versus number of sources. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.10. Probability distribution of the maximum luminosity. . . ...
A Technical Comparison of the TMT and the E-ELT
... but only if AO is employed. The TMT and E-ELT will be the first major observatories designed from the start, with AO as an integral part of the facility. Their AO systems are extensive and complex, and will push the technologies of adaptive mirrors, lasers, wavefront sensors and computation to the l ...
... but only if AO is employed. The TMT and E-ELT will be the first major observatories designed from the start, with AO as an integral part of the facility. Their AO systems are extensive and complex, and will push the technologies of adaptive mirrors, lasers, wavefront sensors and computation to the l ...
Low-dispersion Spectroscopy
... Due to O2 (A, B, ..) and H2 O (a, Z, ..) in the visible, plus CO2 , CH4 , etc… in the near-IR Not to confuse with stellar absorption bands… To correct: needs to observe a hot star (no intrinsic absorption lines) in the same conditions (similar airmass) and divide the object’s spectrum by the hot sta ...
... Due to O2 (A, B, ..) and H2 O (a, Z, ..) in the visible, plus CO2 , CH4 , etc… in the near-IR Not to confuse with stellar absorption bands… To correct: needs to observe a hot star (no intrinsic absorption lines) in the same conditions (similar airmass) and divide the object’s spectrum by the hot sta ...
Double relics in Abell 2345 and Abell 1240
... shocks and turbulence associated with these processes not only heat the ICM but also play an important role in non-thermal phenomena occurring in the ICM (see e.g. the review by Dolag et al. 2008). Although these processes are yet not completely understood, this energy input is supposed to accelerat ...
... shocks and turbulence associated with these processes not only heat the ICM but also play an important role in non-thermal phenomena occurring in the ICM (see e.g. the review by Dolag et al. 2008). Although these processes are yet not completely understood, this energy input is supposed to accelerat ...
Imaging detectors and UV technology
... CCDs vs CMOS-APS sensors UV detectors for solar observations hybrid sensors with wide bandgap materials ...
... CCDs vs CMOS-APS sensors UV detectors for solar observations hybrid sensors with wide bandgap materials ...
Plasma Diagnostics and Hydrodynamic Evolution of Solar Flares
... cooling model. The model is found to provide a well-defined lower limit to the observed cooling time of a flare, but does not well fit the distribution. The discrepancies between the model and observations are assumed to be due to additional heating which is then compared to the flares’ overall ther ...
... cooling model. The model is found to provide a well-defined lower limit to the observed cooling time of a flare, but does not well fit the distribution. The discrepancies between the model and observations are assumed to be due to additional heating which is then compared to the flares’ overall ther ...
A FUSE Survey of Coronal Forbidden Lines in Late
... The study of stellar coronae historically has been relegated to the X-ray wavelengths at which high-temperature plasmas predominately radiate. Unfortunately, observational limitations, including low spectral resolution, lack of precise wavelength calibrations, small effective areas, line blending, no ...
... The study of stellar coronae historically has been relegated to the X-ray wavelengths at which high-temperature plasmas predominately radiate. Unfortunately, observational limitations, including low spectral resolution, lack of precise wavelength calibrations, small effective areas, line blending, no ...
Fundamentals in Nuclear Physics
... which the same comment applies, and the study of energy and the environment. This latter subject was suggested to us by many of our students who felt a need for deeper understanding, given the world in which they were going to live. In other words, the aim was to write down the fundamentals of nucle ...
... which the same comment applies, and the study of energy and the environment. This latter subject was suggested to us by many of our students who felt a need for deeper understanding, given the world in which they were going to live. In other words, the aim was to write down the fundamentals of nucle ...
X-ray astronomy detector
X-ray astronomy detectors are instruments that detect X-rays for use in the study of X-ray astronomy.X-ray astronomy is an observational branch of astronomy which deals with the study of X-ray emission from celestial objects. X-radiation is absorbed by the Earth's atmosphere, so instruments to detect X-rays must be taken to high altitude by balloons, sounding rockets, and satellites. X-ray astronomy is part of space science.X-ray astronomy detectors have been designed and configured primarily for energy and occasionally for wavelength detection using a variety of techniques usually limited to the technology of the time.