Ramin A. Skibba - Southern California Center for Galaxy Evolution
... We use the Yang et al. (2007) galaxy group catalog, which is constructed by applying a DM halo-based group-finding algorithm to the SDSS. We include galaxies with mr=-18 and 0.01 < z < 0.20, yielding 7234 groups with three or more galaxies that satisfy our selection criteria. We exclude groups in wh ...
... We use the Yang et al. (2007) galaxy group catalog, which is constructed by applying a DM halo-based group-finding algorithm to the SDSS. We include galaxies with mr=-18 and 0.01 < z < 0.20, yielding 7234 groups with three or more galaxies that satisfy our selection criteria. We exclude groups in wh ...
Cosmic variance in [O/Fe] in the Galactic disk
... of stars to the interstellar medium (ISM). At a given location within a galaxy, slower supernova (or star formation) rates and higher variance in the yields from different stars will contribute to higher cosmic variance in chemical abundances. If two metals are produced in the same proportions in su ...
... of stars to the interstellar medium (ISM). At a given location within a galaxy, slower supernova (or star formation) rates and higher variance in the yields from different stars will contribute to higher cosmic variance in chemical abundances. If two metals are produced in the same proportions in su ...
20_Testbank
... 1) Explain how we estimate that there are about 50-100 billion galaxies in the observable universe. Answer: Obviously it's impossible to count so many galaxies one by one, but by observing a small part in detail, we can extrapolate to get the total number. As an example, the Hubble deep field shows ...
... 1) Explain how we estimate that there are about 50-100 billion galaxies in the observable universe. Answer: Obviously it's impossible to count so many galaxies one by one, but by observing a small part in detail, we can extrapolate to get the total number. As an example, the Hubble deep field shows ...
Galaxies * Island universes
... disk can overwhelm the light from the rest of the galaxy and a Quasar may even result. Up to 1 solar mass/year infall. • Later, as the galaxy ages, the stuff that CAN fall in, pretty much HAS fallen in, and fueling rate drops. The core fades and instead of looking like a quasar it looks like a Seyfe ...
... disk can overwhelm the light from the rest of the galaxy and a Quasar may even result. Up to 1 solar mass/year infall. • Later, as the galaxy ages, the stuff that CAN fall in, pretty much HAS fallen in, and fueling rate drops. The core fades and instead of looking like a quasar it looks like a Seyfe ...
PEGASUS, THE FLYING HORSE Pegasus is a constellation in the
... NGC 7331 is a spiral galaxy located in Pegasus, 38 million light-years distant with a redshift of 0.0027. It was discovered by musician-astronomer William Herschel in 1784 and was later one of the first nebulous objects to be described as "spiral" by William Parsons. Another of Pegasus's galaxies is ...
... NGC 7331 is a spiral galaxy located in Pegasus, 38 million light-years distant with a redshift of 0.0027. It was discovered by musician-astronomer William Herschel in 1784 and was later one of the first nebulous objects to be described as "spiral" by William Parsons. Another of Pegasus's galaxies is ...
Lecture Notes – Galaxies
... Contain from 10 – 1000s of galaxies, and are gravitationally bound systems. Spacing of galaxies is realtively close, ≈ 100 times diameter of galaxy. (For comparison, in our Galaxy the spacing of stars ≈ 106 diameter of a typical star.) Rich clusters (> 100 members) contain mostly elliptical galaxies ...
... Contain from 10 – 1000s of galaxies, and are gravitationally bound systems. Spacing of galaxies is realtively close, ≈ 100 times diameter of galaxy. (For comparison, in our Galaxy the spacing of stars ≈ 106 diameter of a typical star.) Rich clusters (> 100 members) contain mostly elliptical galaxies ...
Andromeda *ruler of men*
... Andromeda is an autumn constellation that is V shaped the best time of year to view Andromeda is during the month of November with the suggested time being 9pm. It occupies 722 square degrees and is located close to the North Pole in the first quadrant of the Northern Hemisphere. Andromeda can be s ...
... Andromeda is an autumn constellation that is V shaped the best time of year to view Andromeda is during the month of November with the suggested time being 9pm. It occupies 722 square degrees and is located close to the North Pole in the first quadrant of the Northern Hemisphere. Andromeda can be s ...
Gamma Ray Bursts (GRB)
... in violation of the atmospheric nuclear test ban treaty. These satellites carried gamma ray detectors since a nuclear explosion produces gamma rays. ...
... in violation of the atmospheric nuclear test ban treaty. These satellites carried gamma ray detectors since a nuclear explosion produces gamma rays. ...
Effects of triple-α and C(α, γ )16 O reaction rates on the supernova
... presupernova stage is attained as before [2,3]. For the case of OKK–CF85, Si-ignition barely occurs and the evolution would lead to the formation of an Fe-core. In the present study, we stopped the calculation of Si-burning; since the shell burnings of O, Ne, and C are often very active, the computa ...
... presupernova stage is attained as before [2,3]. For the case of OKK–CF85, Si-ignition barely occurs and the evolution would lead to the formation of an Fe-core. In the present study, we stopped the calculation of Si-burning; since the shell burnings of O, Ne, and C are often very active, the computa ...
Milky Way Galaxy
... The Universe is filled with these star systems which themselves cluster together into larger systems. ...
... The Universe is filled with these star systems which themselves cluster together into larger systems. ...
Activity : Milky Way
... genetic damage in others. A local supernova explosion is a possible explanation for the extinction of the dinosaurs. The supermassive star Eta Carinae. 150 years ago, Eta Carinae suffered a violent outburst which gave the star its present strange appearance. Miraculously, the star survived the outbu ...
... genetic damage in others. A local supernova explosion is a possible explanation for the extinction of the dinosaurs. The supermassive star Eta Carinae. 150 years ago, Eta Carinae suffered a violent outburst which gave the star its present strange appearance. Miraculously, the star survived the outbu ...
Astronomy Chapter 17 – Galaxies A. Main Ideas 1. Discovering
... parallax to measure such large distances because the angle by which the galaxy’s position changes as we move around the Sun is too small to be measured. Astronomers use the method of standard candles to measure the distance to distant galaxies. Using the inverse-square law and the known luminosity o ...
... parallax to measure such large distances because the angle by which the galaxy’s position changes as we move around the Sun is too small to be measured. Astronomers use the method of standard candles to measure the distance to distant galaxies. Using the inverse-square law and the known luminosity o ...
1 - Piscataway High School
... occasionally see a new star appear in the sky, grow brighter, then fade away after a few weeks or a year. You will discover that what looks like a new star in the sky, is either a nova, the eruption of a very old dying star, or a supernova, the violent explosive death of an aging star. Modern astron ...
... occasionally see a new star appear in the sky, grow brighter, then fade away after a few weeks or a year. You will discover that what looks like a new star in the sky, is either a nova, the eruption of a very old dying star, or a supernova, the violent explosive death of an aging star. Modern astron ...
Distances in Cosmology One of the most basic measurements that
... If you know the distance between your viewing points and the angle of difference, you know the distance to an object. This principle was used to determine the distance to the Sun (by measuring the apparent times at which Venus crossed the Sun’s limb). Then, knowing this distance, parallax has been u ...
... If you know the distance between your viewing points and the angle of difference, you know the distance to an object. This principle was used to determine the distance to the Sun (by measuring the apparent times at which Venus crossed the Sun’s limb). Then, knowing this distance, parallax has been u ...
PDF format
... True or False? If you want to find elliptical galaxies, you'll have better luck looking in clusters of galaxies than elsewhere in the universe. a) True, galaxy clusters have a much higher percentage of elliptical galaxies than do other parts of the universe. b) True, elliptical galaxies are found ...
... True or False? If you want to find elliptical galaxies, you'll have better luck looking in clusters of galaxies than elsewhere in the universe. a) True, galaxy clusters have a much higher percentage of elliptical galaxies than do other parts of the universe. b) True, elliptical galaxies are found ...
Determining Distances to Other Galaxies
... position angle of these ellipses vary with radius, a spiral-shaped density wave can be formed from a set of nested ovals. Density wave theory is really based on the premise that mutual gravitational attraction of stars and gas clouds at different radii can offset the spiral’s tendency to wind-up. Th ...
... position angle of these ellipses vary with radius, a spiral-shaped density wave can be formed from a set of nested ovals. Density wave theory is really based on the premise that mutual gravitational attraction of stars and gas clouds at different radii can offset the spiral’s tendency to wind-up. Th ...
THREE INTRIGUER NEBULAE IN CONSTELLATION CARINA
... observing projects, have an empirical description of it, thus finding out how many and which members are in the range of an 8-inch telescope, getting conclusions and saving observations for other observers or for future new observations of this target. The inconspicuous constellation Antlia, visible ...
... observing projects, have an empirical description of it, thus finding out how many and which members are in the range of an 8-inch telescope, getting conclusions and saving observations for other observers or for future new observations of this target. The inconspicuous constellation Antlia, visible ...
Here
... of an image since, due to changes in the refractive index, the lightrays from a point-like object that reach the detector have to travel slightly different paths, and hence arrive at slightly different places on the detector. The shape on the detector of an otherwise pointlike source is called the P ...
... of an image since, due to changes in the refractive index, the lightrays from a point-like object that reach the detector have to travel slightly different paths, and hence arrive at slightly different places on the detector. The shape on the detector of an otherwise pointlike source is called the P ...
Pre-Lab
... The word “galaxy,” having been used in English since the fourteenth century, is as old as this language. Galaxy was derived from the French, Greek, and Latin words for milk. To pre-industrial people, lacking bright lights, the Milky Way, a band of diffuse light stretching across the dark sky, would ...
... The word “galaxy,” having been used in English since the fourteenth century, is as old as this language. Galaxy was derived from the French, Greek, and Latin words for milk. To pre-industrial people, lacking bright lights, the Milky Way, a band of diffuse light stretching across the dark sky, would ...
THE PERIOD OF ROTATION OF THE SUN
... We had to make several simplifications in the models for this activity. The models do not include the emission from the element argon, which is present in the Cas A spectrum, because the models published by Hwang & Laming do not include it. We also simplified the gas physics to create the models; we ...
... We had to make several simplifications in the models for this activity. The models do not include the emission from the element argon, which is present in the Cas A spectrum, because the models published by Hwang & Laming do not include it. We also simplified the gas physics to create the models; we ...
Refusing to Go Quietly: GRBs and Their Progenitors
... • If they are very far, their energies may be stupendous....something like the rest mass of the sun being turned into gamma-rays! ...
... • If they are very far, their energies may be stupendous....something like the rest mass of the sun being turned into gamma-rays! ...
An analogy
... – how does your own city look like? how big is it? what is its population? history? how did it develop? – how does it compare to other cities? is it bigger, smaller? are there many young people? old? – how are the cities distributed through the country? ...
... – how does your own city look like? how big is it? what is its population? history? how did it develop? – how does it compare to other cities? is it bigger, smaller? are there many young people? old? – how are the cities distributed through the country? ...
Finnish Centre for Astronomy with ESO
... telescopes, especially from the four 8m ESO Very Large Telescopes (VLT), and the Nordic Optical Telescope (NOT) on La Palma, Spain, in the optical and near-infrared. Observational research is supplemented by modelling, simulations and theoretical work, that are essential in understanding the physics ...
... telescopes, especially from the four 8m ESO Very Large Telescopes (VLT), and the Nordic Optical Telescope (NOT) on La Palma, Spain, in the optical and near-infrared. Observational research is supplemented by modelling, simulations and theoretical work, that are essential in understanding the physics ...
Our Local Group of Galaxies
... How complete is the list of Milky Way dSph companions? • Grey area shows region of the sky covered in Data Release 6 of the SDSS. Previously known MW satellites are marked in blue, new discoveries in red. Solid black line and middle grey stripe are at declination zero - inside is the region to be s ...
... How complete is the list of Milky Way dSph companions? • Grey area shows region of the sky covered in Data Release 6 of the SDSS. Previously known MW satellites are marked in blue, new discoveries in red. Solid black line and middle grey stripe are at declination zero - inside is the region to be s ...
Chapter 2 Surveying the stars 2.1 Star magnitudes
... more than a million million times less. With the Hubble Space Telescope the intensity is more than 10 000 million million times less. Astronomers in ancient times first classified stars in six magnitudes of brightness, a first magnitude star being one of the brightest in the sky and a sixth magnitud ...
... more than a million million times less. With the Hubble Space Telescope the intensity is more than 10 000 million million times less. Astronomers in ancient times first classified stars in six magnitudes of brightness, a first magnitude star being one of the brightest in the sky and a sixth magnitud ...
History of supernova observation
The known history of supernova observation goes back to 185 CE, when, supernova SN 185 appeared, the oldest appearance of a supernova recorded by humankind. Several additional supernovae within the Milky Way galaxy have been recorded since that time, with SN 1604 being the most recent supernova to be observed in this galaxy.Since the development of the telescope, the field of supernova discovery has expanded to other galaxies. These occurrences provide important information on the distances of galaxies. Successful models of supernova behavior have also been developed, and the role of supernovae in the star formation process is now increasingly understood.