CHANDRA on ,
... high-resolution spectrum taken for this source as well as the longest uninterrupted observation of any γ Cas analog. The Chandra light curve shows a high variability but its analysis fails to detect any coherent periodicity up to a frequency of 0.05 Hz. Hardness ratio versus intensity analyses demon ...
... high-resolution spectrum taken for this source as well as the longest uninterrupted observation of any γ Cas analog. The Chandra light curve shows a high variability but its analysis fails to detect any coherent periodicity up to a frequency of 0.05 Hz. Hardness ratio versus intensity analyses demon ...
Mysterious transient objects - NCRA
... Most luminous events in the universe since big bang Flashes of gamma-rays from random directions in sky Few milliseconds to few seconds timescale Even 100 times more energetic than supernovae Brightest sources of cosmic gamma-ray photons in the universe In universe roughly 1 GRB is detected pe ...
... Most luminous events in the universe since big bang Flashes of gamma-rays from random directions in sky Few milliseconds to few seconds timescale Even 100 times more energetic than supernovae Brightest sources of cosmic gamma-ray photons in the universe In universe roughly 1 GRB is detected pe ...
15 Years of Science with XMM-Newton
... by XMM-Newton and NuSTAR: relativistic disk features through broadened Fe-line emission and an associated Compton scattering excess at 10-30 keV temporal and spectral analyses allow to disentangle continuum changes due to time-variable absorption from reflection, which arises from a region withi ...
... by XMM-Newton and NuSTAR: relativistic disk features through broadened Fe-line emission and an associated Compton scattering excess at 10-30 keV temporal and spectral analyses allow to disentangle continuum changes due to time-variable absorption from reflection, which arises from a region withi ...
PSR J1833-1034
... – No X-rays pulsation detection – It is a young pulsar, maybe the youngest in our Galaxy – Its gamma-rays light curve show two peaks separated by ~0.435 in phase and also the Interpulse – The ratio P1/P2 decrease with increasing energies – From the SED seems that the FERMI-LAT data points are well c ...
... – No X-rays pulsation detection – It is a young pulsar, maybe the youngest in our Galaxy – Its gamma-rays light curve show two peaks separated by ~0.435 in phase and also the Interpulse – The ratio P1/P2 decrease with increasing energies – From the SED seems that the FERMI-LAT data points are well c ...
Diapositiva 1
... • They show a series of bright, almost equidistant, knots inside the body of the jet. ...
... • They show a series of bright, almost equidistant, knots inside the body of the jet. ...
ppt - ciera
... fields reveals no new 530 s pulsars, so there is a <0.5% chance of finding a magnetar in any field (Nechita, Gaensler, Muno, et al. in prep). • The pulsar is well within the cluster, with a <10% chance of being an unrelated X-ray source. ...
... fields reveals no new 530 s pulsars, so there is a <0.5% chance of finding a magnetar in any field (Nechita, Gaensler, Muno, et al. in prep). • The pulsar is well within the cluster, with a <10% chance of being an unrelated X-ray source. ...
Solar-type dynamo behaviour in fully convective stars without a
... this is not a critical ingredient in the solar dynamo and supports models in which the dynamo originates throughout the convection zone. Stars across the Hertzsprung–Russell diagram are known to emit X-rays, with only a few exceptions. In main-sequence solar-type and low-mass stars, the X-rays arise ...
... this is not a critical ingredient in the solar dynamo and supports models in which the dynamo originates throughout the convection zone. Stars across the Hertzsprung–Russell diagram are known to emit X-rays, with only a few exceptions. In main-sequence solar-type and low-mass stars, the X-rays arise ...
The Be/X-ray transient V0332153: evidence for a tilt between the
... discuss the evolution of the circumstellar envelope. Owing to the low inclination of the system, parameters are strongly constrained. We find strong evidence for a tilt of the orbital plane with respect to the circumstellar disc (presumably on the equatorial plane). Even though the periastron distan ...
... discuss the evolution of the circumstellar envelope. Owing to the low inclination of the system, parameters are strongly constrained. We find strong evidence for a tilt of the orbital plane with respect to the circumstellar disc (presumably on the equatorial plane). Even though the periastron distan ...
X-ray emission from young pulsar, PWN and SNRs
... • Most of the filaments contain point-like sources at their heads. • All the filaments cometaryare morphology. The X-ray show filaments most • The spectra are non-thermal, with photon indices probably close to Sgr A* and ...
... • Most of the filaments contain point-like sources at their heads. • All the filaments cometaryare morphology. The X-ray show filaments most • The spectra are non-thermal, with photon indices probably close to Sgr A* and ...
X-ray binaries
... The latest large catalogue (Li et al. arXiv: 0707.0544) includes 187 galactic and Magellanic Clouds LMXBs with NSs and BHs as accreting components. Donors can be WDs, or normal low-mass stars (main sequence or sub-giants). Many sources are found in globular clusters. Also there are more and more LMX ...
... The latest large catalogue (Li et al. arXiv: 0707.0544) includes 187 galactic and Magellanic Clouds LMXBs with NSs and BHs as accreting components. Donors can be WDs, or normal low-mass stars (main sequence or sub-giants). Many sources are found in globular clusters. Also there are more and more LMX ...
X-ray binaries
... The latest large catalogue (Li et al. arXiv: 0707.0544) includes 187 galactic and Magellanic Clouds LMXBs with NSs and BHs as accreting components. Donors can be WDs, or normal low-mass stars (main sequence or sub-giants). Many sources are found in globular clusters. Also there are more and more LMX ...
... The latest large catalogue (Li et al. arXiv: 0707.0544) includes 187 galactic and Magellanic Clouds LMXBs with NSs and BHs as accreting components. Donors can be WDs, or normal low-mass stars (main sequence or sub-giants). Many sources are found in globular clusters. Also there are more and more LMX ...
Interstellar Medium and Star Formation
... First detected by Reber (1940): Nonthermal Explanation as synchrotron radiation by ...
... First detected by Reber (1940): Nonthermal Explanation as synchrotron radiation by ...
! • Supermassive Black Holes (SMBH) at Work: Effects of
... is partly due to gas removal and partly due to environment (galaxies in the centers of “groups”) ...
... is partly due to gas removal and partly due to environment (galaxies in the centers of “groups”) ...
poster
... (Wassell et al. 2006). Thus, while the number of counts is small, this feature is compatible with what we expect from a real knot, which was 3 times brighter in 2011. ...
... (Wassell et al. 2006). Thus, while the number of counts is small, this feature is compatible with what we expect from a real knot, which was 3 times brighter in 2011. ...
X-ray Binaries in Nearby Galaxies
... long-standing problem with distance estimates: very hard to study the X-ray luminosity function and spatial distribution other properties, e.g., orbital period, donor masses known only for a few systems ...
... long-standing problem with distance estimates: very hard to study the X-ray luminosity function and spatial distribution other properties, e.g., orbital period, donor masses known only for a few systems ...
ATNF Steering Committee – Astrophysics highlights
... distribution which varies from 40 K in the northeast to 80 K in the southwest. This appears to be the first interferometrically-derived temperature map derived for any extragalactic object using the Ammonia transition. Further observations of southern galaxies are planned. 4. A new spiral arm in the ...
... distribution which varies from 40 K in the northeast to 80 K in the southwest. This appears to be the first interferometrically-derived temperature map derived for any extragalactic object using the Ammonia transition. Further observations of southern galaxies are planned. 4. A new spiral arm in the ...
ASTRONOMY AND ASTROPHYSICS
... nuclear excitation followed by deexcitation, (2) production of neutral pions (and h¡ etc) and their subsequent decay into gamma-rays, (3) bremstrahlung by high energy electrons, (4) inverse-Compton scattering, (5) particle-antiparticle annihilation, and (6) cyclotron line emission in intense magneti ...
... nuclear excitation followed by deexcitation, (2) production of neutral pions (and h¡ etc) and their subsequent decay into gamma-rays, (3) bremstrahlung by high energy electrons, (4) inverse-Compton scattering, (5) particle-antiparticle annihilation, and (6) cyclotron line emission in intense magneti ...
The Fate of the X-ray Emitting Gas in the Early
... A few of the GMAs are obviously correlated with dust. A few of GMAs trace the dust filament to the NW. Many GMAs are not associated with dust or Ha emission. ...
... A few of the GMAs are obviously correlated with dust. A few of GMAs trace the dust filament to the NW. Many GMAs are not associated with dust or Ha emission. ...
Accretion
... Accretion Disk Luminosity • For most accretion disks, total mass of gas in the disk is << M so we may neglect self-gravity • Hence the disk material is in circular Keplerian orbits with angular velocity WK = (GM/R3)1/2 = v/R • Energy of particle with mass m in the Kepler orbit of radius R just graz ...
... Accretion Disk Luminosity • For most accretion disks, total mass of gas in the disk is << M so we may neglect self-gravity • Hence the disk material is in circular Keplerian orbits with angular velocity WK = (GM/R3)1/2 = v/R • Energy of particle with mass m in the Kepler orbit of radius R just graz ...
ppt 3.8 Mb - Bogoliubov Laboratory of Theoretical Physics
... lower than the luminosities of all but one anomalous Xray pulsar. The properties of this pulsar prove that inferred dipolar magnetic field strength and period cannot alone be responsible for the unusual high-energy properties of the magnetars and create new challenges for understanding the possible ...
... lower than the luminosities of all but one anomalous Xray pulsar. The properties of this pulsar prove that inferred dipolar magnetic field strength and period cannot alone be responsible for the unusual high-energy properties of the magnetars and create new challenges for understanding the possible ...
poster
... objects (YSOs) in this region, which lacks high UV flux, and compare evolutionary trends with other young star forming clusters. We present results of our multiwavelength study of IRAS 20050+2720 which includes observations by Chandra, Spitzer, and 2MASS and UBVRI photometry. In total, about 300 YSO ...
... objects (YSOs) in this region, which lacks high UV flux, and compare evolutionary trends with other young star forming clusters. We present results of our multiwavelength study of IRAS 20050+2720 which includes observations by Chandra, Spitzer, and 2MASS and UBVRI photometry. In total, about 300 YSO ...
A Dozen Colliding-Wind X-Ray Binaries in the Star - UvA-DARE
... We analyzed archival Chandra X-ray observations of the central portion of the 30 Doradus region in the Large Magellanic Cloud. The image contains 20 X-ray point sources with luminosities between 5 1032 and 2 1035 ergs s1 (0.2–3.5 keV). A dozen sources have bright WN Wolf-Rayet or spectral type ...
... We analyzed archival Chandra X-ray observations of the central portion of the 30 Doradus region in the Large Magellanic Cloud. The image contains 20 X-ray point sources with luminosities between 5 1032 and 2 1035 ergs s1 (0.2–3.5 keV). A dozen sources have bright WN Wolf-Rayet or spectral type ...
Natasha Wood
... How will you be doing the comparisons? An active galactic nucleus (AGN) is a relatively small region of space at the center of a galaxy that is very luminous over all or part of the electromagnetic spectrum1. This radiation is theorized to be a product of massive black holes at the center of all AGN ...
... How will you be doing the comparisons? An active galactic nucleus (AGN) is a relatively small region of space at the center of a galaxy that is very luminous over all or part of the electromagnetic spectrum1. This radiation is theorized to be a product of massive black holes at the center of all AGN ...
X-ray astronomy
X-ray astronomy is an observational branch of astronomy which deals with the study of X-ray observation and detection from astronomical 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 the space science related to a type of space telescope that can see farther than standard light-absorption telescopes, such as the Mauna Kea Observatories, via x-ray radiation.X-ray emission is expected from astronomical objects that contain extremely hot gasses at temperatures from about a million kelvin (K) to hundreds of millions of kelvin (MK). Although X-rays have been observed emanating from the Sun since the 1940s, the discovery in 1962 of the first cosmic X-ray source was a surprise. This source is called Scorpius X-1 (Sco X-1), the first X-ray source found in the constellation Scorpius. The X-ray emission of Scorpius X-1 is 10,000 times greater than its visual emission, whereas that of the Sun is about a million times less. In addition, the energy output in X-rays is 100,000 times greater than the total emission of the Sun in all wavelengths. Based on discoveries in this new field of X-ray astronomy, starting with Scorpius X-1, Riccardo Giacconi received the Nobel Prize in Physics in 2002. It is now known that such X-ray sources as Sco X-1 are compact stars, such as neutron stars or black holes. Material falling into a black hole may emit X-rays, but the black hole itself does not. The energy source for the X-ray emission is gravity. Infalling gas and dust is heated by the strong gravitational fields of these and other celestial objects.Many thousands of X-ray sources are known. In addition, the space between galaxies in galaxy clusters is filled with a very hot, but very dilute gas at a temperature between 10 and 100 megakelvins (MK). The total amount of hot gas is five to ten times the total mass in the visible galaxies.