Long Ago and Far Away
... galaxy’s actual distance to the distance you worked out in Part II#3, estimate the angular size of this galaxy if it were observed at a distance corresponding to 5 billion years after the Big Bang. (The small angle formula breaks down for large cosmological distances, but just assume it works approx ...
... galaxy’s actual distance to the distance you worked out in Part II#3, estimate the angular size of this galaxy if it were observed at a distance corresponding to 5 billion years after the Big Bang. (The small angle formula breaks down for large cosmological distances, but just assume it works approx ...
Galactic Structure
... Extended star formation history obviously means either managed to retain significant gas after onset of star formation, or the gas went out, but came back in. Gas-free now – why? Ram pressure stripping? Low mean stellar metallicity, typically less than a tenth solar, combined with invariant IM ...
... Extended star formation history obviously means either managed to retain significant gas after onset of star formation, or the gas went out, but came back in. Gas-free now – why? Ram pressure stripping? Low mean stellar metallicity, typically less than a tenth solar, combined with invariant IM ...
Diffraction of Light - Flagstaff High School
... telescope can intercept and focus more starlight than does a small telescope. A larger telescope will produce brighter images and will be able to detect fainter objects. ...
... telescope can intercept and focus more starlight than does a small telescope. A larger telescope will produce brighter images and will be able to detect fainter objects. ...
Apparent magnitude
... shape and size, and the Sun is located asymmetrically more to the south rather than the north (1800’s) J. Kapteyn estimated the size of the G by counting stars, the Sun is in the centre, proof for galactic rotation (Kapteyn’s ...
... shape and size, and the Sun is located asymmetrically more to the south rather than the north (1800’s) J. Kapteyn estimated the size of the G by counting stars, the Sun is in the centre, proof for galactic rotation (Kapteyn’s ...
Diapositiva 1
... On a series of direct photographs taken with the Crosslyer reflector in 1946 and 1947 and centered on the diffuse nebula NGC 1999, there appear several peculiar nebulous objects. The brightest of these (referred to hereafter as "No. 1") resembles, on the best plates, a slightly diffuse star with a v ...
... On a series of direct photographs taken with the Crosslyer reflector in 1946 and 1947 and centered on the diffuse nebula NGC 1999, there appear several peculiar nebulous objects. The brightest of these (referred to hereafter as "No. 1") resembles, on the best plates, a slightly diffuse star with a v ...
May 2010 - Pomona Valley Amateur Astronomers
... Gary Thompson shared with us his experience doing an event for the blind with Project Bright Sky at Joshua Tree State Park. Take a look at the amazing events Club Member Frank Busutil puts on at http://brightsky.pvaa.us/. Our speaker was member Matt Wedel, teacher of Anatomy at Western University of ...
... Gary Thompson shared with us his experience doing an event for the blind with Project Bright Sky at Joshua Tree State Park. Take a look at the amazing events Club Member Frank Busutil puts on at http://brightsky.pvaa.us/. Our speaker was member Matt Wedel, teacher of Anatomy at Western University of ...
Stellar Pops 2
... – Are there IMF variations as evidenced by element mixes in different galaxies? – Detailed understanding of galaxies at z=0 is crucial to interpretation of integrated properties of galaxies at ...
... – Are there IMF variations as evidenced by element mixes in different galaxies? – Detailed understanding of galaxies at z=0 is crucial to interpretation of integrated properties of galaxies at ...
Does size matter (in the SFRs)?
... It is well known that the Hα luminosity is a good tracer of the star formation in a galaxy (Kennicutt 1983 ApJ, 273, 54). The Star Formation Rate (SFR) along the Hubble sequence has been studied extensively (e.g. Kennicutt 1998 ARA&A, 36, 189) and some of the main results are: -SFR increases for lat ...
... It is well known that the Hα luminosity is a good tracer of the star formation in a galaxy (Kennicutt 1983 ApJ, 273, 54). The Star Formation Rate (SFR) along the Hubble sequence has been studied extensively (e.g. Kennicutt 1998 ARA&A, 36, 189) and some of the main results are: -SFR increases for lat ...
1” “Sky-Notes” of the Open University Astronomy Club. April 2005
... Asteroids. The following asteroids can be located with binoculars and small telescopes using a suitable star chart. Pallas (2). Fades from 7th to 8th magnitude during the month. Crosses from Virgo into Coma an area rich in moderately bright galaxies. Worth imaging. See monthly periodicals/BAA Handb ...
... Asteroids. The following asteroids can be located with binoculars and small telescopes using a suitable star chart. Pallas (2). Fades from 7th to 8th magnitude during the month. Crosses from Virgo into Coma an area rich in moderately bright galaxies. Worth imaging. See monthly periodicals/BAA Handb ...
Time From the Perspective of a Particle Physicist
... • end up with core of Iron nuclei plus 26 unbound “free” electrons for every Fe • electrons are “degenerate” as so close together provide most of the pressure resisting gravity • enormous stress. electrons “give way” leaves “hole” size of Earth in center of star ...
... • end up with core of Iron nuclei plus 26 unbound “free” electrons for every Fe • electrons are “degenerate” as so close together provide most of the pressure resisting gravity • enormous stress. electrons “give way” leaves “hole” size of Earth in center of star ...
Theory of the Infinite Universe
... structure. But this process is not infinite. Eventually the structure will reach a point where the gravitational forces break up the building blocks of elementary particles (neutrons, protons, electrons) ...
... structure. But this process is not infinite. Eventually the structure will reach a point where the gravitational forces break up the building blocks of elementary particles (neutrons, protons, electrons) ...
3D maps of the local interstellar medium: searching for the imprints
... distances to a billion stars and, second, to the massive photometric/spectroscopic stellar surveys in progress or preparation that benefit from new multiplex techniques and large detectors. An example of IS absorption data inversion is shown in Figure 1. A merged catalog of color excess measurement ...
... distances to a billion stars and, second, to the massive photometric/spectroscopic stellar surveys in progress or preparation that benefit from new multiplex techniques and large detectors. An example of IS absorption data inversion is shown in Figure 1. A merged catalog of color excess measurement ...
Galaxies and the Universe
... distances to galaxies using a type of variable star called a Cephied, and plotted those distances against the redshifts of those galaxies (as measured by Vesto Slipher). ...
... distances to galaxies using a type of variable star called a Cephied, and plotted those distances against the redshifts of those galaxies (as measured by Vesto Slipher). ...
Chapter 4
... • Many astronomical objects radiate in wavelengths other than visible – Cold gas clouds radiate in the radio – Dust clouds radiate in the infrared – Hot gases around black holes emit x-rays ...
... • Many astronomical objects radiate in wavelengths other than visible – Cold gas clouds radiate in the radio – Dust clouds radiate in the infrared – Hot gases around black holes emit x-rays ...
File
... in the galaxy that we can’t see (not stars). This is dark matter. The dark matter comprises about 90% of the galaxy’s mass. Dark matter is made of… Active Galaxies ...
... in the galaxy that we can’t see (not stars). This is dark matter. The dark matter comprises about 90% of the galaxy’s mass. Dark matter is made of… Active Galaxies ...
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 ...
File
... • Hydrogen and most of the helium in the universe are primordial, that is they date from the earliest times. • All other elements in the universe are a result of stellar nucleosynthesis: they were formed by nuclear fusion in the heart of stars. (also by processes occurring in supernovae) ...
... • Hydrogen and most of the helium in the universe are primordial, that is they date from the earliest times. • All other elements in the universe are a result of stellar nucleosynthesis: they were formed by nuclear fusion in the heart of stars. (also by processes occurring in supernovae) ...
telescope as time machine - Galaxy Evolution Explorer
... So how is looking at far away galaxies like looking back in time? At 300,000 kilometers per second (186,000 miles per second), nothing travels faster than light. Even at this speed, though, it still takes time for light to get from one place to another. If you are looking at your girlfriend just acr ...
... So how is looking at far away galaxies like looking back in time? At 300,000 kilometers per second (186,000 miles per second), nothing travels faster than light. Even at this speed, though, it still takes time for light to get from one place to another. If you are looking at your girlfriend just acr ...
Super Giant
... Hubble’s Law shows this because the further away an object is, the faster it is moving away- thus RAPIDLY expanding…what might be the force causing it to speed up? 2. What is cosmic background radiation? Radiation, particles and energy leftover by the initial Big Bang. Not only found in NJ but Princ ...
... Hubble’s Law shows this because the further away an object is, the faster it is moving away- thus RAPIDLY expanding…what might be the force causing it to speed up? 2. What is cosmic background radiation? Radiation, particles and energy leftover by the initial Big Bang. Not only found in NJ but Princ ...
Volcanoes and Igneous Activity Earth
... 25.1 Properties of Stars Hertzsprung–Russell Diagram A Hertzsprung–Russell diagram shows the relationship between the absolute magnitude and temperature of stars. A main-sequence star is a star that falls into the main sequence category on the H–R diagram. This category contains the majority of ...
... 25.1 Properties of Stars Hertzsprung–Russell Diagram A Hertzsprung–Russell diagram shows the relationship between the absolute magnitude and temperature of stars. A main-sequence star is a star that falls into the main sequence category on the H–R diagram. This category contains the majority of ...
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.