Tom Maccarone (Texas Tech University)
... Jay Strader, Laura Chomiuk (MSU) Anil Seth (Utah) Oleg Gnedin (Michigan), Dimitrios Psaltis (Arizona) ...
... Jay Strader, Laura Chomiuk (MSU) Anil Seth (Utah) Oleg Gnedin (Michigan), Dimitrios Psaltis (Arizona) ...
Lecture 16, AGN Evolution
... Accretion History of the Universe We can now infer the present-day supermassive black hole mass density accreted by AGN and compare it with the ...
... Accretion History of the Universe We can now infer the present-day supermassive black hole mass density accreted by AGN and compare it with the ...
stars - Chandra X
... • On the main sequence: from the Sun back to ZAMS • Younger still: Protoplanetary disks and accretion • More massive: Herbig stars • More embedded: Jets and outflows • Eruptive variables ...
... • On the main sequence: from the Sun back to ZAMS • Younger still: Protoplanetary disks and accretion • More massive: Herbig stars • More embedded: Jets and outflows • Eruptive variables ...
THE DAWN OF X-RAY ASTRONOMY
... and MIT groups. These observations clarified that the observed pulsations were not periodic but chaotic (Holt et al., 1971)16 (Rappaport et al., 1971).17 By 1974, the GSFC group had achieved a temporal resolution of 1 millisecond and showed large chaotic fluctuations occurring even on this time scal ...
... and MIT groups. These observations clarified that the observed pulsations were not periodic but chaotic (Holt et al., 1971)16 (Rappaport et al., 1971).17 By 1974, the GSFC group had achieved a temporal resolution of 1 millisecond and showed large chaotic fluctuations occurring even on this time scal ...
NGC 1808 - Rencontres de Moriond
... photons producing the observed emission line spectrum, and no more than 1/10 of the observed FIR luminosity. ...
... photons producing the observed emission line spectrum, and no more than 1/10 of the observed FIR luminosity. ...
Equation of state constraints for the cold dense matter inside neutron
... Kazan Federal University, 420008, Kremlevskaya 18, Kazan, Russia ...
... Kazan Federal University, 420008, Kremlevskaya 18, Kazan, Russia ...
Source Variability - Center for Astrophysics and Space
... On the left is the probability distribution function for two sources in the same field of view. The central source has an energy half that of the source that is displaced to the lower left. The image on the right shows 9000 total events for this system with the lower energy source having twice the ...
... On the left is the probability distribution function for two sources in the same field of view. The central source has an energy half that of the source that is displaced to the lower left. The image on the right shows 9000 total events for this system with the lower energy source having twice the ...
The Satellites of Uranus and Neptune: A New Astrometrie Programme
... Schmidt plates will be used to measure the positions of the faint stars in relation to the brighter, standard stars, and in turn the positions of the satellites can then be measured relative to the faint stars, ensuring the astrometrie tie-in to the brighter (standard) stars. Preliminary observation ...
... Schmidt plates will be used to measure the positions of the faint stars in relation to the brighter, standard stars, and in turn the positions of the satellites can then be measured relative to the faint stars, ensuring the astrometrie tie-in to the brighter (standard) stars. Preliminary observation ...
Part B
... • Hypernovae - collapse of stars of greater than 30 solar masses which are spinning rapidly. • The black hole forms before star outer layers contract very much. ...
... • Hypernovae - collapse of stars of greater than 30 solar masses which are spinning rapidly. • The black hole forms before star outer layers contract very much. ...
AmiraPoster3
... • SMC X-1 is an eclipsing X-ray pulsar located in the Small Magellanic Cloud (SMC). • Optical counterpart is the B0I supergiant Sk 160. • Long quasi stable period of 50-60 days - believed to be result of quasi periodic obscuration of the neutron star by a precessing accretion disk. • Mode of mass tr ...
... • SMC X-1 is an eclipsing X-ray pulsar located in the Small Magellanic Cloud (SMC). • Optical counterpart is the B0I supergiant Sk 160. • Long quasi stable period of 50-60 days - believed to be result of quasi periodic obscuration of the neutron star by a precessing accretion disk. • Mode of mass tr ...
The X-ray/hard X-ray/gamma-ray connection of gamma
... On short timescales, this is governed by the accretion rate; this is large if the orbit is eccentric. Alternating systems are a natural consequence. ...
... On short timescales, this is governed by the accretion rate; this is large if the orbit is eccentric. Alternating systems are a natural consequence. ...
Summary - Chandra X
... Homan: BHXRB State Transitions Mdot does not uniquely determine spectral state at high luminosities. Peak luminosity is determined by hard to soft transition luminosity. Brighter sources show flaring, resulting in additional structure in hardness-intensity diagram. Associated with steep power law st ...
... Homan: BHXRB State Transitions Mdot does not uniquely determine spectral state at high luminosities. Peak luminosity is determined by hard to soft transition luminosity. Brighter sources show flaring, resulting in additional structure in hardness-intensity diagram. Associated with steep power law st ...
The Super-slow Pulsation X-ray Pulsars in High Mass X
... • 1E 1613.48−5055 in a young supernova remnant RCW 103 P = 6.67 hours (single or binary?) ...
... • 1E 1613.48−5055 in a young supernova remnant RCW 103 P = 6.67 hours (single or binary?) ...
Alanna Connors, for the AstroStatistics Working Group at Harvard
... Bin size>PSF; Many counts/bin; NO processing ...
... Bin size>PSF; Many counts/bin; NO processing ...
The new X-ray universe
... region. The emission line spectrum of the Seyfert 2 galaxy NGC 1068 looks remarkably similar to that of NGC 4151, but with a relatively weaker continuum. The spectra of two high-redshift quasars were searched for evidence of resonance absorption lines from an enriched warm intergalactic medium, but ...
... region. The emission line spectrum of the Seyfert 2 galaxy NGC 1068 looks remarkably similar to that of NGC 4151, but with a relatively weaker continuum. The spectra of two high-redshift quasars were searched for evidence of resonance absorption lines from an enriched warm intergalactic medium, but ...
File
... Mass of 2nd most massive BH at Z=3 is 7.15 108 h1M Accretion rate is 0.240M / year Mass of the host halo of this black hole 4.711013 M ...
... Mass of 2nd most massive BH at Z=3 is 7.15 108 h1M Accretion rate is 0.240M / year Mass of the host halo of this black hole 4.711013 M ...
Document
... Space spectroscopic observations in the UV, visible, and IR requiring long observation times would be much more sensitive with high quantum efficiency (QE) and zero read noise. Techniques are sought which improve the QE of photon counters, or eliminate the read noise of solid-state detectors; and X- ...
... Space spectroscopic observations in the UV, visible, and IR requiring long observation times would be much more sensitive with high quantum efficiency (QE) and zero read noise. Techniques are sought which improve the QE of photon counters, or eliminate the read noise of solid-state detectors; and X- ...
Shockingly Bright Pulsar - Astronomical Society of the Pacific
... (NuSTAR) is the first satellite to focus high-energy X-rays into sharp images. It includes two focusing X-ray telescopes which capture images, and also measure the energy of each incoming X-ray. Essential to the NuSTAR design is a deployable mast which extended to 10 meters after launch. This mast s ...
... (NuSTAR) is the first satellite to focus high-energy X-rays into sharp images. It includes two focusing X-ray telescopes which capture images, and also measure the energy of each incoming X-ray. Essential to the NuSTAR design is a deployable mast which extended to 10 meters after launch. This mast s ...
zaneposter
... These extreme objects comprise the Anomalous X-ray Pulsars (AXPs) and the Soft Gamma-ray Repeaters (SGRs), two classes of sources observationally very similar in many respects (see Mereghetti et al. 2008 for a review).They are all slow X-ray pulsars with spin periods clustered in a narrow range (P ~ ...
... These extreme objects comprise the Anomalous X-ray Pulsars (AXPs) and the Soft Gamma-ray Repeaters (SGRs), two classes of sources observationally very similar in many respects (see Mereghetti et al. 2008 for a review).They are all slow X-ray pulsars with spin periods clustered in a narrow range (P ~ ...
Using a distant X-ray source to detect small Transneptunian Objects
... used measurements from the satellite ROSSI X-ray Timing Explorer of the brightest X-ray object in the sky, Scorpius X-1, which is a pulsar (a neutron star). The team used 90 hours of data obtained between 1996 and 2002. Computer searches of the satellite’s data revealed 58 breaks in the X-rays which ...
... used measurements from the satellite ROSSI X-ray Timing Explorer of the brightest X-ray object in the sky, Scorpius X-1, which is a pulsar (a neutron star). The team used 90 hours of data obtained between 1996 and 2002. Computer searches of the satellite’s data revealed 58 breaks in the X-rays which ...
Draft A101 Slide Set #1 - Astronomical Society of the Pacific
... •The newly identified pulsar is one of a class of objects called “ultraluminous X-ray sources,” or ULXs—which are extremely bright in X-ray emissions. •ULXs were previously all suspected to be “intermediate mass” black holes—black holes up to a few hundred solar masses--accreting matter that heated ...
... •The newly identified pulsar is one of a class of objects called “ultraluminous X-ray sources,” or ULXs—which are extremely bright in X-ray emissions. •ULXs were previously all suspected to be “intermediate mass” black holes—black holes up to a few hundred solar masses--accreting matter that heated ...
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.