Nuclear Synthesis
... • Black holes can keep accumulating mass…including “colliding” Black holes. Very massive (million times mass Sun) at center of many galaxies ...
... • Black holes can keep accumulating mass…including “colliding” Black holes. Very massive (million times mass Sun) at center of many galaxies ...
Properties of Ellipticals and Spirals
... Ellipticals: Velocities of stars in ellipticals are more or less random Velocity dispersions are responsible for the overall shape of galaxies. Oblate and Prolate Ellipticals – how that? Spiral: Velocities of stars in spirals are more ordered. Stars rotate around the galactic center in a disk surrou ...
... Ellipticals: Velocities of stars in ellipticals are more or less random Velocity dispersions are responsible for the overall shape of galaxies. Oblate and Prolate Ellipticals – how that? Spiral: Velocities of stars in spirals are more ordered. Stars rotate around the galactic center in a disk surrou ...
Chapter 30 Notes
... The Milky Way • The galaxy in which we live, the Milky Way, is a spiral galaxy in which the sun is one of hundreds of billions of stars. • Two irregular galaxies, the Large Magellanic Cloud and Small Magellanic Cloud, are our closest neighbors. • These three galaxies are called the Local Group. qua ...
... The Milky Way • The galaxy in which we live, the Milky Way, is a spiral galaxy in which the sun is one of hundreds of billions of stars. • Two irregular galaxies, the Large Magellanic Cloud and Small Magellanic Cloud, are our closest neighbors. • These three galaxies are called the Local Group. qua ...
The X-ray/hard X-ray/gamma-ray connection of gamma
... If the disc dominates the apastron (suppose: having grown larger at the maximum of the superorbital variability); the transition to the propeller moves to the left, and depending on (P,B) the system could be a permanent propeller (to the right of the green line) or a flipflopper (to the left) ...
... If the disc dominates the apastron (suppose: having grown larger at the maximum of the superorbital variability); the transition to the propeller moves to the left, and depending on (P,B) the system could be a permanent propeller (to the right of the green line) or a flipflopper (to the left) ...
Conference Summary Richard Ellis (Caltech) ITALIA
... - 10-16 z-band dropouts to YAB~28.5 corresponding to 6.5
... - 10-16 z-band dropouts to YAB~28.5 corresponding to 6.5
Searching for stars in high-velocity clouds
... does not rule out the scenario proposed by Braun & Burton (1999) and Blitz et al. (1999), but it does rule out HVCs being of the same class of object as the other known dwarf galaxies. If extragalactic then for some reason these H I clouds, unlike other dwarf galaxies, have not formed many (if any) ...
... does not rule out the scenario proposed by Braun & Burton (1999) and Blitz et al. (1999), but it does rule out HVCs being of the same class of object as the other known dwarf galaxies. If extragalactic then for some reason these H I clouds, unlike other dwarf galaxies, have not formed many (if any) ...
Thermonuclear supernovae and cosmology
... Technology Dark matter, dark energy and their detection 2013 NSU, Novosibirsk 23 July 2013 ...
... Technology Dark matter, dark energy and their detection 2013 NSU, Novosibirsk 23 July 2013 ...
Finnish Centre for Astronomy with ESO
... in astronomical research. The ultimate goal of FINCA is to improve the scientific and industrial benefit of Finland’s membership in ESO, and Finland’s international competitiveness in astronomical research. The year 2014 marked the 5th year of operation for FINCA, administratively a Special Unit of ...
... in astronomical research. The ultimate goal of FINCA is to improve the scientific and industrial benefit of Finland’s membership in ESO, and Finland’s international competitiveness in astronomical research. The year 2014 marked the 5th year of operation for FINCA, administratively a Special Unit of ...
public_lector_10
... typically about 20: 1 The dark halos extend 5 to 10 times further out than the disks of these galaxies ...
... typically about 20: 1 The dark halos extend 5 to 10 times further out than the disks of these galaxies ...
Kepler-452b is not a new Earth A twin of the Sun
... calculate its diameter without uncertainties, the images taken by LORRI have confirmed the previous estimated value of 1,208 km. On 13 July, the picture shot from a distance of 768,000 km will be probably considered the iconic image of the entire mission, a spectacular overview ...
... calculate its diameter without uncertainties, the images taken by LORRI have confirmed the previous estimated value of 1,208 km. On 13 July, the picture shot from a distance of 768,000 km will be probably considered the iconic image of the entire mission, a spectacular overview ...
Lecture9
... mass and the collapsed core will have mass larger than the neutron star maximum mass limit ~ 3M☉ So, if the remnant collapsed mass is larger than ~3M☉, the core keeps collapsing to singularity, and hence becomes a black hole. Note: Though nothing can come out of a black hole itself, the gas around t ...
... mass and the collapsed core will have mass larger than the neutron star maximum mass limit ~ 3M☉ So, if the remnant collapsed mass is larger than ~3M☉, the core keeps collapsing to singularity, and hence becomes a black hole. Note: Though nothing can come out of a black hole itself, the gas around t ...
The Virgo interferometer for Gravitational Wave detection
... Ap. J.:http://iopscience.iop.org/0004-637X/715/2/1453. • Search for gravitational waves from compact binary coalescence in LIGO and Virgo data from S5 and VSR1 provisionally accepted in Phys. Rev, D ...
... Ap. J.:http://iopscience.iop.org/0004-637X/715/2/1453. • Search for gravitational waves from compact binary coalescence in LIGO and Virgo data from S5 and VSR1 provisionally accepted in Phys. Rev, D ...
View from the space
... certain types of radiation from reaching the ground. In fact if the Earth’s atmosphere was permeable to harmful X rays, gama rays and ultra violet rays then perhaps life would not have been possible on earth. Astronomers has to go above enough of the Earth's atmosphere to observe some infrared wavel ...
... certain types of radiation from reaching the ground. In fact if the Earth’s atmosphere was permeable to harmful X rays, gama rays and ultra violet rays then perhaps life would not have been possible on earth. Astronomers has to go above enough of the Earth's atmosphere to observe some infrared wavel ...
Elliptical Galaxies
... •similar in form to globular clusters (i.e. nearly spherical) •little gas and dust -- no disk -- little or no star formation •little or no rotation •normal ellipticals can contain from 1 to 100 billion stars. •giant elliptical galaxies are found at the center of dense clusters of galaxies. •a giant ...
... •similar in form to globular clusters (i.e. nearly spherical) •little gas and dust -- no disk -- little or no star formation •little or no rotation •normal ellipticals can contain from 1 to 100 billion stars. •giant elliptical galaxies are found at the center of dense clusters of galaxies. •a giant ...
Lecture19
... rotating neutron stars that act like lighthouses. Beams of radiation coming from the poles look like pulses as they sweep past Earth. ...
... rotating neutron stars that act like lighthouses. Beams of radiation coming from the poles look like pulses as they sweep past Earth. ...
Galaxies - SD43 Teacher Sites
... Life on Earth seems to exist everywhere. Scientists are constantly discovering new species of organisms on this planet in places no one had previously imagined anything could live. We now know there is life beneath the frozen land mass of Antarctica, inside sulphur deposits several kilometres underg ...
... Life on Earth seems to exist everywhere. Scientists are constantly discovering new species of organisms on this planet in places no one had previously imagined anything could live. We now know there is life beneath the frozen land mass of Antarctica, inside sulphur deposits several kilometres underg ...
![arXiv:1505.07406v1 [hep-ph] 27 May 2015](http://s1.studyres.com/store/data/007750137_1-1343a5635a0dda57ac4b2d01226e2ce5-300x300.png)
arXiv:1505.07406v1 [hep-ph] 27 May 2015
... gµν R being added to the determinantal action is analysed from a cosmological point of view. It corresponds to the most general action constructed from a rank two tensor that contains up to first order terms in curvature. This term can equally be seen as a conformal factor multiplying the metric gµν ...
... gµν R being added to the determinantal action is analysed from a cosmological point of view. It corresponds to the most general action constructed from a rank two tensor that contains up to first order terms in curvature. This term can equally be seen as a conformal factor multiplying the metric gµν ...
Lecture 22 - Cosmic distance scale
... As the Earth moves from one side of the Sun to the other, a nearby star will seem to change its position relative to the distant background stars. ...
... As the Earth moves from one side of the Sun to the other, a nearby star will seem to change its position relative to the distant background stars. ...
Galaxies - cloudfront.net
... billions of stars. Galaxies are divided into three types according to shape: spiral, elliptical, and irregular galaxies. • Spiral galaxies spin and appear as a rotating disk of stars and dust, with a bulge in the middle. Several spiral arms reach outward from the central bulge like the arms of a pin ...
... billions of stars. Galaxies are divided into three types according to shape: spiral, elliptical, and irregular galaxies. • Spiral galaxies spin and appear as a rotating disk of stars and dust, with a bulge in the middle. Several spiral arms reach outward from the central bulge like the arms of a pin ...
Astrophysics Questions (DRAFT)
... evolution. What stars leave (i) white dwarfs, (ii) neutron stars, or (iii) black holes? 58. What is a white dwarf star? Why is the radius of a white dwarf a decreasing function of its mass? What is the basic physics that leads to the upper limit on the mass of a white dwarf (i.e., the Chandrasekhar ...
... evolution. What stars leave (i) white dwarfs, (ii) neutron stars, or (iii) black holes? 58. What is a white dwarf star? Why is the radius of a white dwarf a decreasing function of its mass? What is the basic physics that leads to the upper limit on the mass of a white dwarf (i.e., the Chandrasekhar ...
Microsoft Word 97
... 1) The Nuclear Bulge – Our galaxy has the general shape of a pancake with a bulge at its center that contains millions of stars, primarily old ones. This nuclear bulge has the galactic nucleus at its center. The nucleus itself if only about 10 light-years across. 2) The Disk – The part of the pancak ...
... 1) The Nuclear Bulge – Our galaxy has the general shape of a pancake with a bulge at its center that contains millions of stars, primarily old ones. This nuclear bulge has the galactic nucleus at its center. The nucleus itself if only about 10 light-years across. 2) The Disk – The part of the pancak ...
Systematics of Galaxy Properties and Scaling Relations Ay 127
... Virial Theorem connects mass, density, and kinetic temperature, and is thus an equation of a plane in that (theoretical) parameter space. Assumptions about the dynamical structure of ellipticals and their (M/ L) ratios then map the VT into the tilted FP in the observable parameter space of measured ...
... Virial Theorem connects mass, density, and kinetic temperature, and is thus an equation of a plane in that (theoretical) parameter space. Assumptions about the dynamical structure of ellipticals and their (M/ L) ratios then map the VT into the tilted FP in the observable parameter space of measured ...
Chapter 13 The Stellar Graveyard
... Because the mass of white dwarfs when they explode as supernovae is always around 1.0 M⊙, its luminosity is very consistent, and can be used as a standard candle for the measurement of distance to distant galaxies (Chapter 15). The amount of energy produced by white dwarf supernovae and massive star ...
... Because the mass of white dwarfs when they explode as supernovae is always around 1.0 M⊙, its luminosity is very consistent, and can be used as a standard candle for the measurement of distance to distant galaxies (Chapter 15). The amount of energy produced by white dwarf supernovae and massive star ...
GLAST Proposal Review
... – 194 photomultiplier tube sensors (2/tile) – 12 electronics boards (two sets of 6), each handling up to 18 phototubes. High voltage power supply on each board. ...
... – 194 photomultiplier tube sensors (2/tile) – 12 electronics boards (two sets of 6), each handling up to 18 phototubes. High voltage power supply on each board. ...
The Extragalactic Distance Database: Color–Magnitude Diagrams
... magnitude of a particular galaxy’s TRGB we are then able to calculate a distance modulus. The absolute magnitude of stars at the TRGB is MI ≈ −4.0 with only a weak dependence on age and metallicity in this wavelength range. Rizzi et al. (2007) present a zero-point calibration that is adjusted for me ...
... magnitude of a particular galaxy’s TRGB we are then able to calculate a distance modulus. The absolute magnitude of stars at the TRGB is MI ≈ −4.0 with only a weak dependence on age and metallicity in this wavelength range. Rizzi et al. (2007) present a zero-point calibration that is adjusted for me ...
Gamma-ray burst
Gamma-ray bursts (GRBs) are flashes of gamma rays associated with extremely energetic explosions that have been observed in distant galaxies. They are the brightest electromagnetic events known to occur in the universe. Bursts can last from ten milliseconds to several hours. The initial burst is usually followed by a longer-lived ""afterglow"" emitted at longer wavelengths (X-ray, ultraviolet, optical, infrared, microwave and radio).Most observed GRBs are believed to consist of a narrow beam of intense radiation released during a supernova or hypernova as a rapidly rotating, high-mass star collapses to form a neutron star, quark star, or black hole. A subclass of GRBs (the ""short"" bursts) appear to originate from a different process – this may be due to the merger of binary neutron stars. The cause of the precursor burst observed in some of these short events may be due to the development of a resonance between the crust and core of such stars as a result of the massive tidal forces experienced in the seconds leading up to their collision, causing the entire crust of the star to shatter.The sources of most GRBs are billions of light years away from Earth, implying that the explosions are both extremely energetic (a typical burst releases as much energy in a few seconds as the Sun will in its entire 10-billion-year lifetime) and extremely rare (a few per galaxy per million years). All observed GRBs have originated from outside the Milky Way galaxy, although a related class of phenomena, soft gamma repeater flares, are associated with magnetars within the Milky Way. It has been hypothesized that a gamma-ray burst in the Milky Way, pointing directly towards the Earth, could cause a mass extinction event.GRBs were first detected in 1967 by the Vela satellites, a series of satellites designed to detect covert nuclear weapons tests. Hundreds of theoretical models were proposed to explain these bursts in the years following their discovery, such as collisions between comets and neutron stars. Little information was available to verify these models until the 1997 detection of the first X-ray and optical afterglows and direct measurement of their redshifts using optical spectroscopy, and thus their distances and energy outputs. These discoveries, and subsequent studies of the galaxies and supernovae associated with the bursts, clarified the distance and luminosity of GRBs. These facts definitively placed them in distant galaxies and also connected long GRBs with the explosion of massive stars, the only possible source for the energy outputs observed.