ppt
... planets have slightly different properties than nontransiting planets. • Most likely explanation: Transit searches are not as biased as radial velocity searches. One looks for transits around all stars in a field, these are not preselected. The only bias comes with which ones are followed up with Do ...
... planets have slightly different properties than nontransiting planets. • Most likely explanation: Transit searches are not as biased as radial velocity searches. One looks for transits around all stars in a field, these are not preselected. The only bias comes with which ones are followed up with Do ...
Equipartition magnetic fields in normal galaxies
... to that of the total energy density of ISM gas (U gas ) as a function of star formation efficiency (ΣSFR /Σgas ) for the galaxy NGC 6946 at scales of ∼ 0.5 kpc. Here, Σgas is the surface density of the total neutral gas. The total energy density of gas is computed from the thermal energy density of ...
... to that of the total energy density of ISM gas (U gas ) as a function of star formation efficiency (ΣSFR /Σgas ) for the galaxy NGC 6946 at scales of ∼ 0.5 kpc. Here, Σgas is the surface density of the total neutral gas. The total energy density of gas is computed from the thermal energy density of ...
PPT presentation
... The main contaminants are background sources with emission lines redshifted into the on-band filter: [O II] 3727 at z=0.35 or Ly alpha at z=3.1. The contamination increases as the surface density of PNs decreases. Negligible near the galaxy’s center, the contamination may become a problem in the int ...
... The main contaminants are background sources with emission lines redshifted into the on-band filter: [O II] 3727 at z=0.35 or Ly alpha at z=3.1. The contamination increases as the surface density of PNs decreases. Negligible near the galaxy’s center, the contamination may become a problem in the int ...
How common are habitable planets?
... Astronomers answer key question: How common are habitable planets? 4 November 2013 temperature conducive to life. "What this means is, when you look up at the thousands of stars in the night sky, the nearest sunlike star with an Earth-size planet in its habitable zone is probably only 12 light years ...
... Astronomers answer key question: How common are habitable planets? 4 November 2013 temperature conducive to life. "What this means is, when you look up at the thousands of stars in the night sky, the nearest sunlike star with an Earth-size planet in its habitable zone is probably only 12 light years ...
GoSkyWatch User`s Guide
... display. North corresponds to a azimuth of zero degrees, east 90 degrees, south 180 degrees and west 270 degrees. An elevation of zero degrees corresponds to looking directly at the horizon and 90 degrees is directly above. The maximum zoom of 180 degrees is the full sky view. Turning on the celesti ...
... display. North corresponds to a azimuth of zero degrees, east 90 degrees, south 180 degrees and west 270 degrees. An elevation of zero degrees corresponds to looking directly at the horizon and 90 degrees is directly above. The maximum zoom of 180 degrees is the full sky view. Turning on the celesti ...
Here
... It is important to use appropriate units when measuring physical quantities, and to report those units when you report your results. Distances between objects in space are so great that specifying distance in miles is like giving the distance from here to St. Louis in millimeters. Scientists use lig ...
... It is important to use appropriate units when measuring physical quantities, and to report those units when you report your results. Distances between objects in space are so great that specifying distance in miles is like giving the distance from here to St. Louis in millimeters. Scientists use lig ...
GRADE 12A: Physics 7
... • The Milky Way is a spiral galaxy, and the Sun lies about two-thirds of the way out from the centre. • The nearest major galaxy to the Milky Way is the Andromeda galaxy (Andromeda nebula), which is also a spiral. • Even the nearest galaxy lies at a distance of a few million light-years. Light reach ...
... • The Milky Way is a spiral galaxy, and the Sun lies about two-thirds of the way out from the centre. • The nearest major galaxy to the Milky Way is the Andromeda galaxy (Andromeda nebula), which is also a spiral. • Even the nearest galaxy lies at a distance of a few million light-years. Light reach ...
Main-Sequence Stars and the Sun
... Once hydrogen burning begins in the core of a protostar, it becomes a mainsequence star. The main-sequence (hydrogen-burning) phase is by far the largest fraction of a star’s lifetime, and therefore most stars observed in the sky are mainsequence stars. During this time, stars burn quietly, and chan ...
... Once hydrogen burning begins in the core of a protostar, it becomes a mainsequence star. The main-sequence (hydrogen-burning) phase is by far the largest fraction of a star’s lifetime, and therefore most stars observed in the sky are mainsequence stars. During this time, stars burn quietly, and chan ...
Recent science results from VLTI commissioning
... • What will it become? Normal star after more eruptions? Collapse into SN or hypernova? • Is it rotating? What is the origin of the 5.5yr periodicity in some lines and x-rays? Is there a massive equatorial torus? • What is the physical mechanism responsible for the violent instability (outburst(s)), ...
... • What will it become? Normal star after more eruptions? Collapse into SN or hypernova? • Is it rotating? What is the origin of the 5.5yr periodicity in some lines and x-rays? Is there a massive equatorial torus? • What is the physical mechanism responsible for the violent instability (outburst(s)), ...
Supermassive Black Holes in Inactive Galaxies Encyclopedia of Astronomy & Astrophysics eaa.iop.org
... hierarchical structure formation and galaxy mergers (see GALAXIES: INTERACTIONS AND MERGERS). If most large galaxies contain BHs, then mergers produce binary BHs and, in three-body encounters, BH ejections with recoil. How much offset we see, and indeed whether we see two BHs or one or none at all, ...
... hierarchical structure formation and galaxy mergers (see GALAXIES: INTERACTIONS AND MERGERS). If most large galaxies contain BHs, then mergers produce binary BHs and, in three-body encounters, BH ejections with recoil. How much offset we see, and indeed whether we see two BHs or one or none at all, ...
The Final Flight of Atlantis - Westchester Amateur Astronomers
... Venus in our evening sky. Mars is slowly making its way into the constellation of Virgo where it will have a close encounter with Saturn at month’s end. The two planets are about the same brightness (anywhere between +1.0 and +1.5 magnitude) and will come within about 1° of each other on the 30th of ...
... Venus in our evening sky. Mars is slowly making its way into the constellation of Virgo where it will have a close encounter with Saturn at month’s end. The two planets are about the same brightness (anywhere between +1.0 and +1.5 magnitude) and will come within about 1° of each other on the 30th of ...
“Mystery of the Missing Seasons” Available in
... is actually a little closer to the sun when it's winter for Angelo than when it's summer! (Note: he's a Northern Hemisphere dweller.) Yet one has seasons and the other doesn't So they decide it must not be distance from the sun that causes Earth's seasons; the seasons must be caused by something el ...
... is actually a little closer to the sun when it's winter for Angelo than when it's summer! (Note: he's a Northern Hemisphere dweller.) Yet one has seasons and the other doesn't So they decide it must not be distance from the sun that causes Earth's seasons; the seasons must be caused by something el ...
Curiosities of the Sky
... stars whose actual distances apart is great, offers another quandary; persistent and sharply bordered apertures in such an assemblage are a priori as improbable, if not impossible, as straight, narrow holes running through a swarm of bees. The difficulty of these questions indicates one of the reaso ...
... stars whose actual distances apart is great, offers another quandary; persistent and sharply bordered apertures in such an assemblage are a priori as improbable, if not impossible, as straight, narrow holes running through a swarm of bees. The difficulty of these questions indicates one of the reaso ...
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... " ... The random error on a profile is determined by two contributions that we mentioned before: (1) the measurement noise which changes from one stellar source to another due to star magnitude and temperature differences, and (2) the uncorrected residual scintillation component. At the time of wri ...
... " ... The random error on a profile is determined by two contributions that we mentioned before: (1) the measurement noise which changes from one stellar source to another due to star magnitude and temperature differences, and (2) the uncorrected residual scintillation component. At the time of wri ...
Project Icarus: Astronomical Considerations Relating to the Choice
... that the above areas of scientific investigation be considered as listed in order of increasing priority. Thus, scientific investigations conducted en route are a low priority when it comes to the choice of target, not because such investigations are scientifically unimportant but because they can ( ...
... that the above areas of scientific investigation be considered as listed in order of increasing priority. Thus, scientific investigations conducted en route are a low priority when it comes to the choice of target, not because such investigations are scientifically unimportant but because they can ( ...
Lecture 12
... The light from the Andromeda galaxy left it about 1.5Myr ago, and the light from something in the Virgo Cluster about 65 Myr ago (about when the dinosaurs were killed). We’ll see we think the Universe is ~14Gyr old, so light from an object >14Glyr (5000Mpc) away will not have had enough time to reac ...
... The light from the Andromeda galaxy left it about 1.5Myr ago, and the light from something in the Virgo Cluster about 65 Myr ago (about when the dinosaurs were killed). We’ll see we think the Universe is ~14Gyr old, so light from an object >14Glyr (5000Mpc) away will not have had enough time to reac ...
Neutron Star
... B. Accretion Disk Observations C. Jets of Energy from Compact Objects D. Gamma-Ray Bursts ...
... B. Accretion Disk Observations C. Jets of Energy from Compact Objects D. Gamma-Ray Bursts ...
Slide 1
... our best estimates are around 9 billion years. To compare, our estimates for the Universe are that it is around 13 billion years old. So the Milky Way has been around for most of the life of the Universe. ...
... our best estimates are around 9 billion years. To compare, our estimates for the Universe are that it is around 13 billion years old. So the Milky Way has been around for most of the life of the Universe. ...
3 - Celestial Sphere
... SCP) and imaginary lines such as the Celestial Equator (CE) positioned on this sphere. Earth is located at the sphere’s center. Currently, the North Celestial Pole is very close to a star called Polaris. 2) The ecliptic is the apparent annual path of the Sun on the Celestial Sphere. Notice that the ...
... SCP) and imaginary lines such as the Celestial Equator (CE) positioned on this sphere. Earth is located at the sphere’s center. Currently, the North Celestial Pole is very close to a star called Polaris. 2) The ecliptic is the apparent annual path of the Sun on the Celestial Sphere. Notice that the ...
The Milky Way
... Galaxies seem to take one of four different appearances Ellipticals have no dust No cold gas: No star formation Made mostly of old stars ...
... Galaxies seem to take one of four different appearances Ellipticals have no dust No cold gas: No star formation Made mostly of old stars ...
Parallax - mjeffries
... A moving observer sees fixed objects move. Near objects appear to move more than far objects. Telephone poles whip by faster than distant trees. The effect is due to the change in observation point, and is used by our eyes for depth perception. angle A base angle B ...
... A moving observer sees fixed objects move. Near objects appear to move more than far objects. Telephone poles whip by faster than distant trees. The effect is due to the change in observation point, and is used by our eyes for depth perception. angle A base angle B ...
normal and active - FirstLight Astro
... ✴ irregulars are relatively small and non-luminous ✴ we are larger than most spirals but there are some 4x bigger, 10x more luminous ✴ ellipticals have a huge range, from 1% our size ➙ 5x bigger than us ...
... ✴ irregulars are relatively small and non-luminous ✴ we are larger than most spirals but there are some 4x bigger, 10x more luminous ✴ ellipticals have a huge range, from 1% our size ➙ 5x bigger than us ...
Energy production in stars
... From time immemorial people must have been curious to know what keeps the sun shining. The first scientific attempt at an explanation was by Helmholtz about one hundred years ago, and was based on the force most familiar to physicists at the time, gravitation. When a gram of matter falls to the sun’ ...
... From time immemorial people must have been curious to know what keeps the sun shining. The first scientific attempt at an explanation was by Helmholtz about one hundred years ago, and was based on the force most familiar to physicists at the time, gravitation. When a gram of matter falls to the sun’ ...
Corvus (constellation)
Corvus is a small constellation in the Southern Celestial Hemisphere. Its name comes from the Latin word ""raven"" or ""crow"". It includes only 11 stars with brighter than 4.02 magnitudes. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations. The four brightest stars, Gamma, Delta, Epsilon, and Beta Corvi from a distinctive quadrilateral in the night sky. The young star Eta Corvi has been found to have two debris disks.