multiwavelength observations of the gamma-ray
... We present multiwavelength observations of the ultraluminous blazar-type radio loud quasar PKS 0528+134 in quiescence during the period 2009 July–December. Four Target-of-Opportunity observations with the XMM-Newton satellite in the 0.2–10 keV range were supplemented with optical observations at the ...
... We present multiwavelength observations of the ultraluminous blazar-type radio loud quasar PKS 0528+134 in quiescence during the period 2009 July–December. Four Target-of-Opportunity observations with the XMM-Newton satellite in the 0.2–10 keV range were supplemented with optical observations at the ...
Astronomy Astrophysics A VLT/FLAMES survey for massive binaries in Westerlund 1 &
... accompanied by photometric modulation with an identical period in both WR 1 & 6, but Bonanos (2007) demonstrate that such behaviour is absent in W239. Moreover, phase resolved near-IR spectral analysis of 5 WR binaries reveals that variability due to wind-wind interaction driven asymmetries – rather ...
... accompanied by photometric modulation with an identical period in both WR 1 & 6, but Bonanos (2007) demonstrate that such behaviour is absent in W239. Moreover, phase resolved near-IR spectral analysis of 5 WR binaries reveals that variability due to wind-wind interaction driven asymmetries – rather ...
and other gamma-ray telescopes
... was originally called GLAST by itself) LAT field of view ~2.5 sr GLAST Burst Monitor GBM: 10 keV – 25 MeV GBM field of view ~9 sr Launch: This Winter Lifetime: 5 years minimum, 10 years goal ...
... was originally called GLAST by itself) LAT field of view ~2.5 sr GLAST Burst Monitor GBM: 10 keV – 25 MeV GBM field of view ~9 sr Launch: This Winter Lifetime: 5 years minimum, 10 years goal ...
The X-ray/radio and UV luminosity expected from symbiotic systems
... Foley et al. (2012a) even find that SNe Ia with blueshifted circumstellar/interstellar absorption systematically have higher ejecta velocities, which could mean that the SNe Ia comes from a variety of progenitor systems and that SNe Ia from systems with possible winds tends to have more kinetic ener ...
... Foley et al. (2012a) even find that SNe Ia with blueshifted circumstellar/interstellar absorption systematically have higher ejecta velocities, which could mean that the SNe Ia comes from a variety of progenitor systems and that SNe Ia from systems with possible winds tends to have more kinetic ener ...
radiation and matter interaction in strong magnetic field of accreting
... It is obvious nowadays that quantum processes are very important to understand the physics of a number of astrophysical objects as well as for the understanding of the processes in the early Universe (Raffelt, 1996). Extreme conditions, including high temperature and density as well as strong electr ...
... It is obvious nowadays that quantum processes are very important to understand the physics of a number of astrophysical objects as well as for the understanding of the processes in the early Universe (Raffelt, 1996). Extreme conditions, including high temperature and density as well as strong electr ...
An X-Ray, Optical and Infra-red study of High-Mass X
... is continually growing and is now a similar size to that of the Milky Way, despite a significant mass difference between the two galaxies. In this thesis, I present multi-wavelength observations of Be/X-ray binaries that have undergone an outburst during the past three years, including the discovery ...
... is continually growing and is now a similar size to that of the Milky Way, despite a significant mass difference between the two galaxies. In this thesis, I present multi-wavelength observations of Be/X-ray binaries that have undergone an outburst during the past three years, including the discovery ...
Modeling non-thermal emission from stellar bow shocks
... bow shock with Suzaku. From their observation, they obtained an X-ray luminosity lower limit at 1.1 × 1032 erg s−1 , well over our predictions. ...
... bow shock with Suzaku. From their observation, they obtained an X-ray luminosity lower limit at 1.1 × 1032 erg s−1 , well over our predictions. ...
Point Spread Function of real Wolter-I X-ray mirrors
... where α is the grazing incidence angle of X-rays, should be classified as roughness. Fourier components exceeding this limit should instead contribute to the geometric errors. Although reasonable, this criterion can apparently be applied only to a discrete power spectrum. In addition, it seems more l ...
... where α is the grazing incidence angle of X-rays, should be classified as roughness. Fourier components exceeding this limit should instead contribute to the geometric errors. Although reasonable, this criterion can apparently be applied only to a discrete power spectrum. In addition, it seems more l ...
Vicky Kaspi Chandra Anomalous X-ray Pulsars Fotis Gavriil
... – How are SGRs and AXPs related? One evolves to the other? – How are both related to high-B radio pulsars and other neutron stars? – Distinguishing property: Age? Mass? ...
... – How are SGRs and AXPs related? One evolves to the other? – How are both related to high-B radio pulsars and other neutron stars? – Distinguishing property: Age? Mass? ...
THE SOFT STATE OF CYGNUS X-1 OBSERVED WITH
... models is calculated assuming a slab temperature of 10 eV. This is appropriate for accretion disks around active galaxies, but is much cooler than the disk temperatures observed from X-ray binaries, and thus the Compton broadening of the iron emission emerging from the accretion disk will be underpr ...
... models is calculated assuming a slab temperature of 10 eV. This is appropriate for accretion disks around active galaxies, but is much cooler than the disk temperatures observed from X-ray binaries, and thus the Compton broadening of the iron emission emerging from the accretion disk will be underpr ...
High-Energy Emission from the PSR B1259
... ∼ 4 mCrab, corresponding to a luminosity of a few x 1034 erg/s at the distance of 2 kpc. The hard X-ray flux and spectrum detected by CGRO agrees with the X-ray emission measured by simultaneous ASCA observations. EGRET upper limits are significant, and exclude strong inverse Compton cooling in the ...
... ∼ 4 mCrab, corresponding to a luminosity of a few x 1034 erg/s at the distance of 2 kpc. The hard X-ray flux and spectrum detected by CGRO agrees with the X-ray emission measured by simultaneous ASCA observations. EGRET upper limits are significant, and exclude strong inverse Compton cooling in the ...
part 2
... The X-ray study of rotation-powered or radio pulsars has had a close link with Xray astronomy from its very beginning. After the discovery of Sco X−1 as the first extra-solar X-ray source by rocket-borne Geiger counters (Giacconi et al. 1962), the next source of celestial X-rays identified was the C ...
... The X-ray study of rotation-powered or radio pulsars has had a close link with Xray astronomy from its very beginning. After the discovery of Sco X−1 as the first extra-solar X-ray source by rocket-borne Geiger counters (Giacconi et al. 1962), the next source of celestial X-rays identified was the C ...
models for low-mass x-ray binaries in the elliptical
... (2007) independently found that the two XLFs (GCs and field sources) show significant differences at low luminosities (below 1037 ergs s1), pointing to a different LMXB formation mechanism in GCs. The natural question that arises is whether (1) all LMXBs were formed in GCs through dynamical interac ...
... (2007) independently found that the two XLFs (GCs and field sources) show significant differences at low luminosities (below 1037 ergs s1), pointing to a different LMXB formation mechanism in GCs. The natural question that arises is whether (1) all LMXBs were formed in GCs through dynamical interac ...
Clumpy wind accretion in supergiant neutron star high mass X
... 2010; Bodaghee et al. 2010; Romano et al. 2013, 2014b). The spectroscopic properties of the SFXT X-ray emission is typical of wind accreting NS systems, and can be usually described by using a power-law model with a cut-off around 10-30 keV (see, e.g., Romano et al. 2008; Sidoli et al. 2009; Romano ...
... 2010; Bodaghee et al. 2010; Romano et al. 2013, 2014b). The spectroscopic properties of the SFXT X-ray emission is typical of wind accreting NS systems, and can be usually described by using a power-law model with a cut-off around 10-30 keV (see, e.g., Romano et al. 2008; Sidoli et al. 2009; Romano ...
The Reflection Component from Cygnus X
... the complex iron line region as well as the rest of the reflection component. The iron line is clearly broadened and is well-described by a relativistic blurring model, providing an opportunity to constrain the black hole spin. Although the spin constraint depends somewhat on which continuum model i ...
... the complex iron line region as well as the rest of the reflection component. The iron line is clearly broadened and is well-described by a relativistic blurring model, providing an opportunity to constrain the black hole spin. Although the spin constraint depends somewhat on which continuum model i ...
ASTRONOMY AND ASTROPHYSICS The 10–200µm spectral
... 1993), broad emission lines are extinguished in Seyfert 2 galaxies by a dusty torus located at ≤ 100 pc from the nucleus, but they should be scattered into our line of sight by free electrons around the torus and should be observed in polarized light. However, Heisler et al. (1997) did not detect br ...
... 1993), broad emission lines are extinguished in Seyfert 2 galaxies by a dusty torus located at ≤ 100 pc from the nucleus, but they should be scattered into our line of sight by free electrons around the torus and should be observed in polarized light. However, Heisler et al. (1997) did not detect br ...
A wide Chandra view of the core of the Perseus cluster
... there is a progressive steep increase of bubbles radius with distance from the nucleus (see also Randall et al 2011 for a sequence of bubbles in an elliptical galaxy). Diehl et al (2008) discuss bubbles which are continuously fed energy from the nucleus, which seems unlikely for Perseus. We note tha ...
... there is a progressive steep increase of bubbles radius with distance from the nucleus (see also Randall et al 2011 for a sequence of bubbles in an elliptical galaxy). Diehl et al (2008) discuss bubbles which are continuously fed energy from the nucleus, which seems unlikely for Perseus. We note tha ...
Gamma-ray burst investigation via polarimetry and spectroscopy
... above 2.5 μm are too faint by many magnitudes for 8–10 m telescopes. Thus, a completely different strategy is needed to step beyond redshift 13 to measure when the first stars formed. Fortunately, nuclear physics offers such a new strategy. Similar to X-ray and optical absorption lines due to transi ...
... above 2.5 μm are too faint by many magnitudes for 8–10 m telescopes. Thus, a completely different strategy is needed to step beyond redshift 13 to measure when the first stars formed. Fortunately, nuclear physics offers such a new strategy. Similar to X-ray and optical absorption lines due to transi ...
ROSAT Ian R. Stevens* and David K. Strickland*
... noting that the fit quality of the spectra for the other Seyfert galaxies in Turner et al. (1993) was substantially better than for NGC 1365. Iyomoto et al. (1997) reported on ASCA observations of NGC 1365, finding evidence for a soft thermal component, which dominates at low energies, a hard power- ...
... noting that the fit quality of the spectra for the other Seyfert galaxies in Turner et al. (1993) was substantially better than for NGC 1365. Iyomoto et al. (1997) reported on ASCA observations of NGC 1365, finding evidence for a soft thermal component, which dominates at low energies, a hard power- ...
THE STAR FORMATION AND NUCLEAR ACCRETION HISTORIES OF NORMAL GALAXIES
... We combine IR, optical and X-ray data from the overlapping, 9.3 deg2 NOAO Deep Wide-Field Survey (NDWFS), AGN and Galaxy Evolution Survey (AGES), and XBoötes Survey to measure the Xray evolution of 6146 normal galaxies as a function of absolute optical luminosity, redshift, and spectral type over t ...
... We combine IR, optical and X-ray data from the overlapping, 9.3 deg2 NOAO Deep Wide-Field Survey (NDWFS), AGN and Galaxy Evolution Survey (AGES), and XBoötes Survey to measure the Xray evolution of 6146 normal galaxies as a function of absolute optical luminosity, redshift, and spectral type over t ...
Radiatively driven Rayleigh-Taylor instability candidates around a
... optically thin gaps in between the RTI allowed radiation to escape, and the overdense material falls back to the disk plane. On largers scales, infalling gas is thought to strike the walls of the outflow cavity bubble, which effectively slides and settles down to the disk plane. The simulations of KK ...
... optically thin gaps in between the RTI allowed radiation to escape, and the overdense material falls back to the disk plane. On largers scales, infalling gas is thought to strike the walls of the outflow cavity bubble, which effectively slides and settles down to the disk plane. The simulations of KK ...
THE MYSTERIOUS SICKLE OBJECT IN THE CARINA NEBULA: A
... can be found in Preibisch et al. (2012). The angular resolution of the Herschel maps is 5′′ , 12′′ , 18′′ , 25′′ , and 36′′ for the 70, 160, 250, 350, and 500 µm band, respectively. At a distance of 2.3 kpc this corresponds to physical scales ranging from 0.06 to 0.4 pc. The clump near the Sickle ne ...
... can be found in Preibisch et al. (2012). The angular resolution of the Herschel maps is 5′′ , 12′′ , 18′′ , 25′′ , and 36′′ for the 70, 160, 250, 350, and 500 µm band, respectively. At a distance of 2.3 kpc this corresponds to physical scales ranging from 0.06 to 0.4 pc. The clump near the Sickle ne ...
CEA
... GCN position notice (WXM) given 22 s after the beginning of the burst Raptor (LANL) observed 65 sec after burst Optical afterglow extremely faint after 2 hours GRB may have occurred on region with no surrouding gas or dust, so the shock wave had little material to smash into may support the binary ...
... GCN position notice (WXM) given 22 s after the beginning of the burst Raptor (LANL) observed 65 sec after burst Optical afterglow extremely faint after 2 hours GRB may have occurred on region with no surrouding gas or dust, so the shock wave had little material to smash into may support the binary ...
erice_091014 - Astronomy & Astrophysics Group
... BUT Still strong case for a wide-spectrum high-energy monitoring satellite. e.g. 5 of the 9 SGBs in Berger et al (2007) had only X-ray positions, but these were measured to ~6 arcseconds. GW triggers from ET network would locate source to ~10 sq. deg. With only optical afterglows, that leaves ~107 g ...
... BUT Still strong case for a wide-spectrum high-energy monitoring satellite. e.g. 5 of the 9 SGBs in Berger et al (2007) had only X-ray positions, but these were measured to ~6 arcseconds. GW triggers from ET network would locate source to ~10 sq. deg. With only optical afterglows, that leaves ~107 g ...
MULTI-FREQUENCY TIME VARIABILITY OF ACTIVE GALACTIC NUCLEI RITABAN CHATTERJEE
... and “may be also after that.” It read, “Welcome to the Blazar group, Ritaban”, and in the next five years I never hesitated to knock on his door. He was always there. At first, to answer my questions, then, as time went by, to direct me to the idea instead of giving a simple answer, and toward the e ...
... and “may be also after that.” It read, “Welcome to the Blazar group, Ritaban”, and in the next five years I never hesitated to knock on his door. He was always there. At first, to answer my questions, then, as time went by, to direct me to the idea instead of giving a simple answer, and toward the e ...
History of X-ray astronomy
The history of X-ray astronomy begins in the 1920s, with interest in short wave communications for the U.S. Navy. This was soon followed by extensive study of the earth's ionosphere. By 1927, interest in the detection of X-ray and ultraviolet (UV) radiation at high altitudes inspired researchers to launch Goddard's rockets into the upper atmosphere to support theoretical studies and data gathering. The first successful rocket flight equipped with instrumentation able to detect solar ultraviolet radiation occurred in 1946. X-ray solar studies began in 1949. By 1973 a solar instrument package orbited on Skylab providing significant solar data.In 1965 the Goddard Space Flight Center program in X-ray astronomy was initiated with a series of balloon-borne experiments. In the 1970s this was followed by high altitude sounding rocket experiments, and that was followed by orbiting (satellite) observatories.The first rocket flight to successfully detect a cosmic source of X-ray emission was launched in 1962 by a group at American Science and Engineering (AS&E).X-ray wavelengths reveal information about the bodies (sources) that emit them.