Clusters of galaxies
... 524 orbits with ACS and WFC3 24 clusters z ~ 0.15 – 0.9, in 14 passbands Headline science is gravitational lensing and supernovae, however far more interesting will be the multiband dataset on the cluster targets themselves. Spectroscopic followup of samples selected on colours and morphology. ...
... 524 orbits with ACS and WFC3 24 clusters z ~ 0.15 – 0.9, in 14 passbands Headline science is gravitational lensing and supernovae, however far more interesting will be the multiband dataset on the cluster targets themselves. Spectroscopic followup of samples selected on colours and morphology. ...
4P38.pdf
... the transition region and chromospheric FUV-UV emissions of the young Sun are expected to be 20-60 and 10-20 times stronger, respectively, than presently. In the entire XUV interval from 1 to 1200 Å, we find that the solar high-energy flux was about 3 times the present value 2.5 Gyr ago and about 6 ...
... the transition region and chromospheric FUV-UV emissions of the young Sun are expected to be 20-60 and 10-20 times stronger, respectively, than presently. In the entire XUV interval from 1 to 1200 Å, we find that the solar high-energy flux was about 3 times the present value 2.5 Gyr ago and about 6 ...
A Comparison of CCD Images Taken with Different Cameras Abstract
... its outer layers which expand outward. The gas in this expanding cloud is ionized by the central star and gives off its own light. The cloud is seen from Earth in one of a variety of shapes taken on by planetary nebulae. Step 4: The central star of the planetary nebula is the core of the original st ...
... its outer layers which expand outward. The gas in this expanding cloud is ionized by the central star and gives off its own light. The cloud is seen from Earth in one of a variety of shapes taken on by planetary nebulae. Step 4: The central star of the planetary nebula is the core of the original st ...
Chapter 12
... • How massive are newborn stars? —Stars greater than about 150MSun would be so luminous that radiation pressure would blow them apart. —Degeneracy pressure stops the contraction of objects <0.08MSun before fusion starts. ...
... • How massive are newborn stars? —Stars greater than about 150MSun would be so luminous that radiation pressure would blow them apart. —Degeneracy pressure stops the contraction of objects <0.08MSun before fusion starts. ...
Document
... • If you can see both stars in the spectrum, then you may be able to use Doppler shifts to measure the radial velocities of both stars. This gives you the mass ratio, regardless of the viewing angle (e.g. nearly face-on, nearly edgeon, etc.). This is usually useful information. • If you can find the ...
... • If you can see both stars in the spectrum, then you may be able to use Doppler shifts to measure the radial velocities of both stars. This gives you the mass ratio, regardless of the viewing angle (e.g. nearly face-on, nearly edgeon, etc.). This is usually useful information. • If you can find the ...
Procedurally Generating an Artificial Galaxy
... the location of the stars within each cube. We will generate three random numbers (U1, U2, and U3) from U(0,1) for each star. These numbers determine the stars position in the three dimensions where 0 is at one edge of the cube and 1 is at the other. The likelihood of any stars getting too close to ...
... the location of the stars within each cube. We will generate three random numbers (U1, U2, and U3) from U(0,1) for each star. These numbers determine the stars position in the three dimensions where 0 is at one edge of the cube and 1 is at the other. The likelihood of any stars getting too close to ...
ASTR 104 - Wagner Homework 1
... 1. The first neutron stars that were discovered were all pulsars. Explain why we do not see ALL neutron stars as pulsars. 2. A pulsar was observed to have a planetary system orbiting it. Explain why this was a great surprise to astronomers. 3. Explain what we mean when we discuss the event horizon o ...
... 1. The first neutron stars that were discovered were all pulsars. Explain why we do not see ALL neutron stars as pulsars. 2. A pulsar was observed to have a planetary system orbiting it. Explain why this was a great surprise to astronomers. 3. Explain what we mean when we discuss the event horizon o ...
A-level Physics A Mark scheme Unit 05 - Section 2A
... Universe expanding from an extremely dense and hot point over the past 13.6 billion years. The candidate also describes the evidence from, the relative abundances of H and He and the measurement of the microwave background radiation and states they support the big bang theory. Hubble’s Law may also ...
... Universe expanding from an extremely dense and hot point over the past 13.6 billion years. The candidate also describes the evidence from, the relative abundances of H and He and the measurement of the microwave background radiation and states they support the big bang theory. Hubble’s Law may also ...
Evolution of Warm Debris Around Sun-like Stars: Clues to Terrestrial
... from 10-100 Myr, and drops to nearly zero beyond 300 Myr. The magnitude of the excess appears to be correlated with the frequency of debris in that the preferred epoch of excess exhibits that largest dust signatures. The results are broadly consistent with previous results based on open cluster stud ...
... from 10-100 Myr, and drops to nearly zero beyond 300 Myr. The magnitude of the excess appears to be correlated with the frequency of debris in that the preferred epoch of excess exhibits that largest dust signatures. The results are broadly consistent with previous results based on open cluster stud ...
A Global Citizen of the Skies
... Q6: If you were a Viking living in Britain 1000 years ago, how would the stellar constellations you know be compared to today’s constellations? Here we develop an understanding that the UK has never been an isolated community. It demonstrates how even staying in your own country and cultural region, ...
... Q6: If you were a Viking living in Britain 1000 years ago, how would the stellar constellations you know be compared to today’s constellations? Here we develop an understanding that the UK has never been an isolated community. It demonstrates how even staying in your own country and cultural region, ...
The Parallax Activity: Measuring the Distances to
... 2. Running the activity to collect data Divide your class into teams of four students each. Pro- vide each team with a quadrant. If you have time, it would be good for each team to make their own quadrant. Take the class outside to where you have marked ...
... 2. Running the activity to collect data Divide your class into teams of four students each. Pro- vide each team with a quadrant. If you have time, it would be good for each team to make their own quadrant. Take the class outside to where you have marked ...
L87 THE b PICTORIS MOVING GROUP B. ZUCkERMAN AND
... The associations listed above are of interest for various reasons. But when one’s focus is the study of planets and circumstellar disks, the stars in the b Pic moving group have important advantages over all others because Table 1 stars are substantially closer than stars in TW Hydrae and h Chamaele ...
... The associations listed above are of interest for various reasons. But when one’s focus is the study of planets and circumstellar disks, the stars in the b Pic moving group have important advantages over all others because Table 1 stars are substantially closer than stars in TW Hydrae and h Chamaele ...
Galaxies – Island universes
... the first billion years or so after the Big Bang • Many have later infalling matter which has been pulled on by nearby mass and thus doesn’t fall straight in. It settles into a rotating disk, arranging itself into a flat, roughly circularly orbiting plane of material • This material gradually conden ...
... the first billion years or so after the Big Bang • Many have later infalling matter which has been pulled on by nearby mass and thus doesn’t fall straight in. It settles into a rotating disk, arranging itself into a flat, roughly circularly orbiting plane of material • This material gradually conden ...
ASTRO-114--Lecture 40-
... in composition. That’s only a minor change in the structure of the star. Most stars will look pretty much the same if they have the same mass, even if they differ a bit in composition. So the major thing that determines what a star looks like is its mass. A secondary characteristic would be its comp ...
... in composition. That’s only a minor change in the structure of the star. Most stars will look pretty much the same if they have the same mass, even if they differ a bit in composition. So the major thing that determines what a star looks like is its mass. A secondary characteristic would be its comp ...
Chapter 14 – Chemical Analysis
... • For neutral lines of ionized species (e.g. Fe I in the Sun) these effects cancel, so the COG is independent of gravity • For ionized lines of ionized species (e.g Fe II in the Sun), the curves shift to the right with increasing gravity, roughly as g1/3 ...
... • For neutral lines of ionized species (e.g. Fe I in the Sun) these effects cancel, so the COG is independent of gravity • For ionized lines of ionized species (e.g Fe II in the Sun), the curves shift to the right with increasing gravity, roughly as g1/3 ...
Reconnaissance of the TRAPPIST-1 exoplanet system in the Lyman
... Using the out-of-transit Ly-α line as a reference, we identified marginal flux decreases (Fig. 3) during the transit of TRAPPIST-1b (40±21% in [-95 ; -55] km s−1 ) and after the transit of TRAPPIST-1c (41±18% in [-135 ; -40] km s−1 ). Since the star has a variable corona (Wheatley et al. 2017), this ...
... Using the out-of-transit Ly-α line as a reference, we identified marginal flux decreases (Fig. 3) during the transit of TRAPPIST-1b (40±21% in [-95 ; -55] km s−1 ) and after the transit of TRAPPIST-1c (41±18% in [-135 ; -40] km s−1 ). Since the star has a variable corona (Wheatley et al. 2017), this ...
The Hipparcos Star Globe Booklet - Cosmos
... cluster, the ‘jaw’ of the bull in the Taurus constellation. The data showed that some of the stars that were apparently part of this cluster were impostors: they are not in fact travelling with the cluster, and over time will part company with its true members. ...
... cluster, the ‘jaw’ of the bull in the Taurus constellation. The data showed that some of the stars that were apparently part of this cluster were impostors: they are not in fact travelling with the cluster, and over time will part company with its true members. ...
The resolved stellar populations of M32 Monachesi, Antonela
... Figure 1: Left panel: An example of a face-on spiral galaxy: M74 (NGC 628). It is located 30 million light-years away toward the constellation Pisces. The design of the spiral arms of M74, traced by bright blue star clusters and dark cosmic dust lanes, is similar in many respects to our own Milky Wa ...
... Figure 1: Left panel: An example of a face-on spiral galaxy: M74 (NGC 628). It is located 30 million light-years away toward the constellation Pisces. The design of the spiral arms of M74, traced by bright blue star clusters and dark cosmic dust lanes, is similar in many respects to our own Milky Wa ...
Cygnus (constellation)
Cygnus /ˈsɪɡnəs/ is a northern constellation lying on the plane of the Milky Way, deriving its name from the Latinized Greek word for swan. The swan is one of the most recognizable constellations of the northern summer and autumn, it features a prominent asterism known as the Northern Cross (in contrast to the Southern Cross). Cygnus was among the 48 constellations listed by the 2nd century astronomer Ptolemy, and it remains one of the 88 modern constellations.Cygnus contains Deneb, one of the brightest stars in the night sky and one corner of the Summer Triangle, as well as some notable X-ray sources and the giant stellar association of Cygnus OB2. One of the stars of this association, NML Cygni, is one of the largest stars currently known. The constellation is also home to Cygnus X-1, a distant X-ray binary containing a supergiant and unseen massive companion that was the first object widely held to be a black hole. Many star systems in Cygnus have known planets as a result of the Kepler Mission observing one patch of the sky, the patch is the area around Cygnus. In addition, most of the eastern part of Cygnus is dominated by the Hercules–Corona Borealis Great Wall, a giant galaxy filament that is the largest known structure in the observable universe; covering most of the northern sky.