Powerpoint presentation, Created by Jim Ulvestad, NRAO, 2002
... The Expanded VLA (EVLA) More than 700 astronomers use the VLA every year … However, most of the electronic equipment dates back to the late 1970s ...
... The Expanded VLA (EVLA) More than 700 astronomers use the VLA every year … However, most of the electronic equipment dates back to the late 1970s ...
Document
... The Expanded VLA (EVLA) More than 700 astronomers use the VLA every year … However, most of the electronic equipment dates back to the late 1970s ...
... The Expanded VLA (EVLA) More than 700 astronomers use the VLA every year … However, most of the electronic equipment dates back to the late 1970s ...
The Stromgren sphere around the highest-redshift QSOs
... disks: – Disk winds, infalling material deposited onto the disk, instabilities, self-gravitating disks, star formation … • Binary black holes and coevolution of galaxies and QSOs/AGNs ...
... disks: – Disk winds, infalling material deposited onto the disk, instabilities, self-gravitating disks, star formation … • Binary black holes and coevolution of galaxies and QSOs/AGNs ...
What We Might Learn from Gravitational Waves
... Most promising GW+EM source: Short/hard Gamma-ray burst GRBs definitely exist ~1/day in the Universe GRBs are very bright/relativistic GRBs can be detected “all sky” throughout the Universe GRBs have been observed “nearby” Some long, and some short (2 second divide) ...
... Most promising GW+EM source: Short/hard Gamma-ray burst GRBs definitely exist ~1/day in the Universe GRBs are very bright/relativistic GRBs can be detected “all sky” throughout the Universe GRBs have been observed “nearby” Some long, and some short (2 second divide) ...
Cataclysmic Cosmic Events and How to Observe Them www.springer.com/series/5338
... their violence and energy output. Active galaxies, containing supermassive black holes at their centers, can swallow a solar mass every month, releasing huge amounts of energy that amateur astronomers can observe as a fluctuation in light output. The luminosity of some of these objects is truly mind ...
... their violence and energy output. Active galaxies, containing supermassive black holes at their centers, can swallow a solar mass every month, releasing huge amounts of energy that amateur astronomers can observe as a fluctuation in light output. The luminosity of some of these objects is truly mind ...
Chapter14 The Bizarre Stellar Graveyard-pptx
... – A ball of neutrons left over from a massive star supernova and supported by neutron degeneracy pressure • How were neutron stars discovered? – Beams of radiation from a rotating neutron star sweep through space like lighthouse beams, making them appear to pulse. – Observations of these pulses were ...
... – A ball of neutrons left over from a massive star supernova and supported by neutron degeneracy pressure • How were neutron stars discovered? – Beams of radiation from a rotating neutron star sweep through space like lighthouse beams, making them appear to pulse. – Observations of these pulses were ...
ppt - chris.engelbrecht.nithep.ac.za
... 1E 0102.2-7219 (Figure 1) is an oxygen-rich supernova remnant in the Small Magellanic Cloud. X-ray observations reveal the blast wave andyield a shock radius of 22 arcseconds at the 60 kpc distance of the SMC. The spectrum of the blast wave yields a temperature of kTx 0.8 keV and an ionization tim ...
... 1E 0102.2-7219 (Figure 1) is an oxygen-rich supernova remnant in the Small Magellanic Cloud. X-ray observations reveal the blast wave andyield a shock radius of 22 arcseconds at the 60 kpc distance of the SMC. The spectrum of the blast wave yields a temperature of kTx 0.8 keV and an ionization tim ...
A massive hypergiant star as the progenitor of the supernova SN
... point source detected in 1997 was a compact cluster of many stars, with a combined luminosity of the order of 106 solar luminosities (106L[). Second, the spatial coincidence of the putative single star with SN 2005gl alone did not provide conclusive evidence that the supernova explosion was actually ...
... point source detected in 1997 was a compact cluster of many stars, with a combined luminosity of the order of 106 solar luminosities (106L[). Second, the spatial coincidence of the putative single star with SN 2005gl alone did not provide conclusive evidence that the supernova explosion was actually ...
The Sun and Stars 4.1 Energy formation and layers of the Sun 4.2
... Prominences and Solar Flares. It is important for us to follow the Sunspot cycle to know when there is going to be an increase in Sunspots, because they cause Solar Flares and Prominences. Although the Earth’s magnetic field can deflect or pull in much of the energy that is carried in a solar flare, ...
... Prominences and Solar Flares. It is important for us to follow the Sunspot cycle to know when there is going to be an increase in Sunspots, because they cause Solar Flares and Prominences. Although the Earth’s magnetic field can deflect or pull in much of the energy that is carried in a solar flare, ...
the chandra deep field–north survey. xvii. evolution of
... investigate the expected long-term decay of magnetic activity of late-type stars due to the gradual spin-down of stellar rotation from a magnetized stellar wind. Thirteen X-ray sources are associated with late-type stars; 11 of these constitute a well-defined sample for statistical analysis. This sa ...
... investigate the expected long-term decay of magnetic activity of late-type stars due to the gradual spin-down of stellar rotation from a magnetized stellar wind. Thirteen X-ray sources are associated with late-type stars; 11 of these constitute a well-defined sample for statistical analysis. This sa ...
ISOCAM 4 m imaging of the nuclear starburst in M83
... the mechanism that governs the magnitude of the burst in the central regions of galaxies and the way it may propagate, are important issues because they relate to the more general questions of the origin of the AGNs and their occurence since Sanders et al.(1988) proposed that the most important star ...
... the mechanism that governs the magnitude of the burst in the central regions of galaxies and the way it may propagate, are important issues because they relate to the more general questions of the origin of the AGNs and their occurence since Sanders et al.(1988) proposed that the most important star ...
Properties of simulated galaxies at z~4-7
... Extension to lower redshift to test further the interplay between galactic winds & AGN feedback. LAEs at z ~ 3: ANGUS + CRASHα, in collaboration with Akila Jeeson-Daniel (UoM). ...
... Extension to lower redshift to test further the interplay between galactic winds & AGN feedback. LAEs at z ~ 3: ANGUS + CRASHα, in collaboration with Akila Jeeson-Daniel (UoM). ...
![arXiv:1102.4757v1 [astro-ph.SR] 23 Feb 2011](http://s1.studyres.com/store/data/017735077_1-cb16692362fed9e2a0fe2690d128f0ce-300x300.png)
Main-Sequence Stars and the Sun
... to 2nd transition in hydrogen will be relevant. The variation of the prominent absorption lines in the visible part of the spectrum with spectral class, and their relation to the surface temperature of the star is as follows. Hydrogen Balmer lines. Absorption lines caused by hydrogen atoms that are ...
... to 2nd transition in hydrogen will be relevant. The variation of the prominent absorption lines in the visible part of the spectrum with spectral class, and their relation to the surface temperature of the star is as follows. Hydrogen Balmer lines. Absorption lines caused by hydrogen atoms that are ...
STC-Scripting Guide for Celestia
... When iron is heated it starts first to glow deep red, going through yellow and finally being bright white, at the same time its luminosity also increases. The same is in principle true for stars; the luminosity only depends on their surface temperature (color) and their emitting area (or rather thei ...
... When iron is heated it starts first to glow deep red, going through yellow and finally being bright white, at the same time its luminosity also increases. The same is in principle true for stars; the luminosity only depends on their surface temperature (color) and their emitting area (or rather thei ...
On the anomalous mass defect of strange stars in the Field
... were considered to represent confinement in Refs. [20–23]. In a recent work, the Richardson potential [24], which incorporates the asymptotic freedom and linear quark confinement, and also used in Refs. [22, 23], was considered to investigate the SQM in strong magnetic field by the authors of Ref. [ ...
... were considered to represent confinement in Refs. [20–23]. In a recent work, the Richardson potential [24], which incorporates the asymptotic freedom and linear quark confinement, and also used in Refs. [22, 23], was considered to investigate the SQM in strong magnetic field by the authors of Ref. [ ...
5 Report of the Panel on Stars and Stellar Evolution
... The opening of new parts of the electromagnetic spectrum dramatically broadened our view of stellar phenomena, leading to a number of breakthrough discoveries. Newly discovered radio pulsars in binaries, including the unique double pulsar system, provide some of the most stringent tests of general r ...
... The opening of new parts of the electromagnetic spectrum dramatically broadened our view of stellar phenomena, leading to a number of breakthrough discoveries. Newly discovered radio pulsars in binaries, including the unique double pulsar system, provide some of the most stringent tests of general r ...
Cosmological dynamics with non-minimally coupled scalar field and
... components in order to distinguish spectroscopic pairs from false pairs created by projection along the line of sight. Of six pair candidates observed, companions (estimated mass ratios 5:1 and 7:1) are detected for two galaxies down to a 3σ limiting emission-line flux of ∼ 10−17 erg s−1 cm−2 . This ...
... components in order to distinguish spectroscopic pairs from false pairs created by projection along the line of sight. Of six pair candidates observed, companions (estimated mass ratios 5:1 and 7:1) are detected for two galaxies down to a 3σ limiting emission-line flux of ∼ 10−17 erg s−1 cm−2 . This ...
P - Inaf
... least the final sample of model galaxies is biased in a similar way as the real data, thus allowing for a more meaningful comparison.2 Fig. 6 shows the average metallicity and mass-weighted stellar ages of the W08 model galaxies as functions of stellar and halo mass, with central and satellite galax ...
... least the final sample of model galaxies is biased in a similar way as the real data, thus allowing for a more meaningful comparison.2 Fig. 6 shows the average metallicity and mass-weighted stellar ages of the W08 model galaxies as functions of stellar and halo mass, with central and satellite galax ...
critical angular momentum distributions in collapsars: quiescent
... the distributions of specific angular momentum we considered were constant in the equatorial plane, and smoothly decreasing toward the rotation axis. This is unrealistic, as the specific angular momentum increases outward in the core and envelope, with marked transitions at the boundaries between di ...
... the distributions of specific angular momentum we considered were constant in the equatorial plane, and smoothly decreasing toward the rotation axis. This is unrealistic, as the specific angular momentum increases outward in the core and envelope, with marked transitions at the boundaries between di ...
PowerPoint Presentation - Isolated Neutron Stars, solid crust
... Over the last few years, intense observational resources have been devoted to study the faint thermal emission from neutron stars and to search for features in their spectrum. Isolated neutron stars play a key role in compact objects astrophysics: these are the only sources in which we can see direc ...
... Over the last few years, intense observational resources have been devoted to study the faint thermal emission from neutron stars and to search for features in their spectrum. Isolated neutron stars play a key role in compact objects astrophysics: these are the only sources in which we can see direc ...
Formation of elliptical galaxies
... •Disk merger remnants, as well as ULIRGS, can follow the Fundamental Plane and the MBH-relation (Robertson et al. 2005; Springel et al. 2005) •Mergers trigger strong central and extended starbursts and AGN activity (Barnes 2002, di Matteo et al 2006) •So far most dynamical, kinematical and photome ...
... •Disk merger remnants, as well as ULIRGS, can follow the Fundamental Plane and the MBH-relation (Robertson et al. 2005; Springel et al. 2005) •Mergers trigger strong central and extended starbursts and AGN activity (Barnes 2002, di Matteo et al 2006) •So far most dynamical, kinematical and photome ...
Cygnus X-1
Cygnus X-1 (abbreviated Cyg X-1) is a well-known galactic X-ray source, thought to be a black hole, in the constellation Cygnus. It was discovered in 1964 during a rocket flight and is one of the strongest X-ray sources seen from Earth, producing a peak X-ray flux density of 6977229999999999999♠2.3×10−23 Wm−2 Hz−1 (7003230000000000000♠2.3×103 Jansky). Cygnus X-1 was the first X-ray source widely accepted to be a black hole and it remains among the most studied astronomical objects in its class. The compact object is now estimated to have a mass about 14.8 times the mass of the Sun and has been shown to be too small to be any known kind of normal star, or other likely object besides a black hole. If so, the radius of its event horizon is about 7004440000000000000♠44 km.Cygnus X-1 belongs to a high-mass X-ray binary system about 7019574266339685654♠6070 ly from the Sun that includes a blue supergiant variable star designated HDE 226868 which it orbits at about 0.2 AU, or 20% of the distance from the Earth to the Sun. A stellar wind from the star provides material for an accretion disk around the X-ray source. Matter in the inner disk is heated to millions of degrees, generating the observed X-rays. A pair of jets, arranged perpendicular to the disk, are carrying part of the energy of the infalling material away into interstellar space.This system may belong to a stellar association called Cygnus OB3, which would mean that Cygnus X-1 is about five million years old and formed from a progenitor star that had more than 7001400000000000000♠40 solar masses. The majority of the star's mass was shed, most likely as a stellar wind. If this star had then exploded as a supernova, the resulting force would most likely have ejected the remnant from the system. Hence the star may have instead collapsed directly into a black hole.Cygnus X-1 was the subject of a friendly scientific wager between physicists Stephen Hawking and Kip Thorne in 1975, with Hawking betting that it was not a black hole. He conceded the bet in 1990 after observational data had strengthened the case that there was indeed a black hole in the system. This hypothesis has not been confirmed due to a lack of direct observation but has generally been accepted from indirect evidence.