SGES 1302 INTRODUCTION TO EARTH SYSTEM
... The universe has no spatial boundary according to the standard Big Bang model, but nevertheless may be spatially finite (compact). This can be understood using a two-dimensional analogy: the surface of a sphere has no edge, but nonetheless has a finite area. ...
... The universe has no spatial boundary according to the standard Big Bang model, but nevertheless may be spatially finite (compact). This can be understood using a two-dimensional analogy: the surface of a sphere has no edge, but nonetheless has a finite area. ...
Formation of the Oort Cloud28 Mar Assignment for Fri •
... Visible: NASA, C.R. O'Dell and S.K. Wong (Rice University) Infrared: NASA; K.L. Luhman (Harvard‐Smithsonian Center for Astrophysics); & G. Schneider, E. Young, G. Rieke, A. Cotera, H. Chen, M. Rieke, R. Thompson (Steward Observatory) ...
... Visible: NASA, C.R. O'Dell and S.K. Wong (Rice University) Infrared: NASA; K.L. Luhman (Harvard‐Smithsonian Center for Astrophysics); & G. Schneider, E. Young, G. Rieke, A. Cotera, H. Chen, M. Rieke, R. Thompson (Steward Observatory) ...
The Life Cycle of Stars
... The Death of a Star After spending approximately 10 billion years as a main sequence star, a star’s available hydrogen will have been converted to helium by nuclear fusion. -> helium-rich core->less hydrogen to burn->core begins to contract->heats the core->fusion restart in the outer layer->outer ...
... The Death of a Star After spending approximately 10 billion years as a main sequence star, a star’s available hydrogen will have been converted to helium by nuclear fusion. -> helium-rich core->less hydrogen to burn->core begins to contract->heats the core->fusion restart in the outer layer->outer ...
! • Supermassive Black Holes (SMBH) at Work: Effects of
... to measure black hole outburst history – Measure energy, age, duration – SMBH governs correlation with bulge/halo – SMBH can disrupt star formation at early times (e .g., NGC4342 - see Bogdan poster) – Can break “tight” correlation of MSMBH with Mbulge ...
... to measure black hole outburst history – Measure energy, age, duration – SMBH governs correlation with bulge/halo – SMBH can disrupt star formation at early times (e .g., NGC4342 - see Bogdan poster) – Can break “tight” correlation of MSMBH with Mbulge ...
PHYSICS 015
... For the most massive stars, the Schwarzschild radius is already too big. For example, if you wanted to allow a 10-solar-mass star to settle down as a neutron star, about 10 km in diameter, it already inside its Schwarzschild radius and is doomed to collapse! Stars can’t ‘know’ that they should shed ...
... For the most massive stars, the Schwarzschild radius is already too big. For example, if you wanted to allow a 10-solar-mass star to settle down as a neutron star, about 10 km in diameter, it already inside its Schwarzschild radius and is doomed to collapse! Stars can’t ‘know’ that they should shed ...
Galaxy Formation Leading questions for today • How do visible
... • the timescale for this merger phase is typically 5 × 108 h−1 yr. • if the merger rate is constant, then for every observed merger now, 1010 /(5 × 108 )=20 happened in the past. past. • in total, 11*20 galaxies in NGC catalogue may have undergone merging, or ≈ 200. • there are 440 ellipticals in th ...
... • the timescale for this merger phase is typically 5 × 108 h−1 yr. • if the merger rate is constant, then for every observed merger now, 1010 /(5 × 108 )=20 happened in the past. past. • in total, 11*20 galaxies in NGC catalogue may have undergone merging, or ≈ 200. • there are 440 ellipticals in th ...
1_Introduction
... Stars in the solar neighborhood move randomly at speeds of about 40 km/sec relative to the Sun. But… Is it useful to think of stars’ velocity relative to the Sun? ...
... Stars in the solar neighborhood move randomly at speeds of about 40 km/sec relative to the Sun. But… Is it useful to think of stars’ velocity relative to the Sun? ...
Lecture 24, The local group
... are exceptions) Gasrich, highmass dwarfs (dIs) are found to be widely distributed Observed in nearby groups and clusters as well as the Local Group ...
... are exceptions) Gasrich, highmass dwarfs (dIs) are found to be widely distributed Observed in nearby groups and clusters as well as the Local Group ...
Where do you find yourself now??
... A spiral galaxy of at least two hundred billion stars. Our Sun is buried deep within the Orion Arm about 26 000 light years from the centre. Towards the centre of the Galaxy the stars are packed together much closer than they are where we live. Notice also the presence of small globular clusters of ...
... A spiral galaxy of at least two hundred billion stars. Our Sun is buried deep within the Orion Arm about 26 000 light years from the centre. Towards the centre of the Galaxy the stars are packed together much closer than they are where we live. Notice also the presence of small globular clusters of ...
distance to the centre of the Milky Way.
... The ‘Universe’ was Resized After Shapley: we knew we were about 2/3 of the way out from the very centre of a huge stellar system, now known to be about 100,000 light years in diameter. Note that Shapley actually overestimated the distances somewhat, because he didn’t fully understand the effects of ...
... The ‘Universe’ was Resized After Shapley: we knew we were about 2/3 of the way out from the very centre of a huge stellar system, now known to be about 100,000 light years in diameter. Note that Shapley actually overestimated the distances somewhat, because he didn’t fully understand the effects of ...
How Big is the Solar System?
... Another boundary that separates the Solar System from the rest of the galaxy is the heliosphere. This is the region where the solar wind collides with the interstellar medium and slows down. This region extends out to about 95 AU, or 3 times the orbit of Pluto. No spacecraft have ever reached the he ...
... Another boundary that separates the Solar System from the rest of the galaxy is the heliosphere. This is the region where the solar wind collides with the interstellar medium and slows down. This region extends out to about 95 AU, or 3 times the orbit of Pluto. No spacecraft have ever reached the he ...
AN INTRODUCTION TO ASTRONOMY Dr. Uri Griv •
... Explanation: How could a galaxy become shaped like a ring? The rim of the blue galaxy pictured on the right is an immense ring-like structure 150,000 light years in diameter composed of newly formed, extremely bright, massive stars. That galaxy, AM 0644-741, is known as a ring galaxy and was caused ...
... Explanation: How could a galaxy become shaped like a ring? The rim of the blue galaxy pictured on the right is an immense ring-like structure 150,000 light years in diameter composed of newly formed, extremely bright, massive stars. That galaxy, AM 0644-741, is known as a ring galaxy and was caused ...
characteristics of stars
... When a star ends its life it runs out of __________ and other fuels needed to produce energy. When this happens the star _________ _________ and begins to cool. RED GIANT - a star near the end of its life, that becomes larger and redder as it runs out of its hydrogen fuel. RED SUPERGIANT - a star wi ...
... When a star ends its life it runs out of __________ and other fuels needed to produce energy. When this happens the star _________ _________ and begins to cool. RED GIANT - a star near the end of its life, that becomes larger and redder as it runs out of its hydrogen fuel. RED SUPERGIANT - a star wi ...
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... We can in principle image H I condensations in the still neutral, prereionization universe using the 21cm line. Several experiments are now being constructed or planned to do this, e.g., the Mileura WideField Array in Australia, or the Square Kilometer Array (SKA) ...
... We can in principle image H I condensations in the still neutral, prereionization universe using the 21cm line. Several experiments are now being constructed or planned to do this, e.g., the Mileura WideField Array in Australia, or the Square Kilometer Array (SKA) ...
UNIVERSITY OF SOUTHAMPTON PHYS2013W1 SEMESTER 1
... is dominated by the 14 brightest cluster stars, and let us further assume that they are all of the same type (that is, they all have the same magnitude). What is the distance to the cluster in pc, and what is the apparent and absolute V-band magnitude of each of the 14 bright stars? ...
... is dominated by the 14 brightest cluster stars, and let us further assume that they are all of the same type (that is, they all have the same magnitude). What is the distance to the cluster in pc, and what is the apparent and absolute V-band magnitude of each of the 14 bright stars? ...
WHERE DO WE SEARCH FOR LIFE IN THE UNIVERSE?
... Elimination of Low Mass Stars If we eliminate all stars that have a luminosity that is less than 1% of the Sun’s, then we eliminate nearly 75% of all stars in the Milky Way! ...
... Elimination of Low Mass Stars If we eliminate all stars that have a luminosity that is less than 1% of the Sun’s, then we eliminate nearly 75% of all stars in the Milky Way! ...
pres
... Dwarf Irr galaxies are dominated by dark matter, but also the gas mass is dominating the stellar mass Obey the sDM/sHI = cste relation All rotation curves can be explained, when the observed surface density of gas is multiplied by a constant factor CDM would not be dominating in the center, as is ...
... Dwarf Irr galaxies are dominated by dark matter, but also the gas mass is dominating the stellar mass Obey the sDM/sHI = cste relation All rotation curves can be explained, when the observed surface density of gas is multiplied by a constant factor CDM would not be dominating in the center, as is ...
From galaxies to stars
... Aside: To an astronomer, every element other than hydrogen and helium is called a metal, so oxygen and carbon are described as metals. We saw last week how only hydrogen and helium were made in the Big Bang, so the first generation of stars, made from the primordial gas of hydrogen and helium, was ...
... Aside: To an astronomer, every element other than hydrogen and helium is called a metal, so oxygen and carbon are described as metals. We saw last week how only hydrogen and helium were made in the Big Bang, so the first generation of stars, made from the primordial gas of hydrogen and helium, was ...
The hierarchical structure of the Universe (go from little to large)
... - Everything you see is part of the Galaxy • The glow of the Milky Way • Stars • Star clusters (open clusters and globular clusters) • Planetary nebulae (dying stars) • Supernova remnants (stars that blew up) • Diffuse nebulae (glowing interstellar gas) ...
... - Everything you see is part of the Galaxy • The glow of the Milky Way • Stars • Star clusters (open clusters and globular clusters) • Planetary nebulae (dying stars) • Supernova remnants (stars that blew up) • Diffuse nebulae (glowing interstellar gas) ...
A Massive Molecular Gas Reservoir in the z= 5.3 Submillimeter
... We report the detection of CO J=2→1, 5→4, and 6→5 emission in the highest-redshift submillimeter galaxy (SMG) AzTEC-3 at z=5.298, using the Expanded Very Large Array and the Plateau de Bure Interferometer. These observations ultimately confirm the redshift, making AzTEC-3 the most submillimeter-lumi ...
... We report the detection of CO J=2→1, 5→4, and 6→5 emission in the highest-redshift submillimeter galaxy (SMG) AzTEC-3 at z=5.298, using the Expanded Very Large Array and the Plateau de Bure Interferometer. These observations ultimately confirm the redshift, making AzTEC-3 the most submillimeter-lumi ...
Galaxies - schoolphysics
... two giant plates held face to face with a diameter of a little over 100 000 light years and made up of some hundred thousand million (1011) stars as well as great clouds of gas. (See: 11-14/Astronomy/Text/Milky Way) ...
... two giant plates held face to face with a diameter of a little over 100 000 light years and made up of some hundred thousand million (1011) stars as well as great clouds of gas. (See: 11-14/Astronomy/Text/Milky Way) ...
Interstellar Medium (ISM) Interstellar Extinction Star Formation
... • As a protostar grows by the gravitational accretion of gases, KelvinHelmholtz contraction causes it to heat and begin glowing ...
... • As a protostar grows by the gravitational accretion of gases, KelvinHelmholtz contraction causes it to heat and begin glowing ...