File - Mr. Catt`s Class
... includes the Milky Way Galaxy, the Andromeda galaxy, and the two Magellanic Clouds. 3. A third method of measuring the masses of galaxies takes advantage of their clustering. It uses the Doppler effect to find the speed (and thus period) of a galaxy at the outskirts of a cluster. ...
... includes the Milky Way Galaxy, the Andromeda galaxy, and the two Magellanic Clouds. 3. A third method of measuring the masses of galaxies takes advantage of their clustering. It uses the Doppler effect to find the speed (and thus period) of a galaxy at the outskirts of a cluster. ...
The Perseid Meteor Shower
... A meteor shower is worth watching. Perseid meteor showers are known for their regularity. Every year, around the 12th of August, people watch the Perseids. These falling stars have been seen for almost 2000 years. Every year, there is a good number of falling stars. It may be possible to see as many ...
... A meteor shower is worth watching. Perseid meteor showers are known for their regularity. Every year, around the 12th of August, people watch the Perseids. These falling stars have been seen for almost 2000 years. Every year, there is a good number of falling stars. It may be possible to see as many ...
Populations of Galaxies and their Formation at z < 7
... Galaxy formation is still ongoing –for low mass systems ...
... Galaxy formation is still ongoing –for low mass systems ...
Document
... break technique in combination with the new generation of 8- to 10-m telescopes made it possible to identify significant samples of high-redshift objects. Lyman Break Galaxies (LBGs) are color-selected, luminous, star forming galaxies that emitted their light more than 10 billion years ago, e.g., at ...
... break technique in combination with the new generation of 8- to 10-m telescopes made it possible to identify significant samples of high-redshift objects. Lyman Break Galaxies (LBGs) are color-selected, luminous, star forming galaxies that emitted their light more than 10 billion years ago, e.g., at ...
Have You Seen Canopus Tonight?
... know, is brightest looking of all. Who then follows? It is Canopus, of course. Usually forgotten, Canopus should dazzle us too. Most stars familiar to us appear four to sixteen times fainter than Sirius; only Canopus can compete with the Dog Star. Half as bright, we should all know this star. But, h ...
... know, is brightest looking of all. Who then follows? It is Canopus, of course. Usually forgotten, Canopus should dazzle us too. Most stars familiar to us appear four to sixteen times fainter than Sirius; only Canopus can compete with the Dog Star. Half as bright, we should all know this star. But, h ...
Marking Scheme of Observational Sessions
... Eg : - Observer can mark Orion nebula (by a Symbol) in its position ( at the constellation of “Orion”) in his/her constellation mapping drawing. But drawing Orion nebula IS NOT ACCEPTABLE ! Maximum Minus marks that can be given for each report is (-2 ) Observers should make a Relative apparent magni ...
... Eg : - Observer can mark Orion nebula (by a Symbol) in its position ( at the constellation of “Orion”) in his/her constellation mapping drawing. But drawing Orion nebula IS NOT ACCEPTABLE ! Maximum Minus marks that can be given for each report is (-2 ) Observers should make a Relative apparent magni ...
PPT
... Usually, z = v/c and so z = 0.2 20% speed of light But quasars with z = 6 have been found. This does NOT mean a velocity = 6x the speed of light!!! Why? Because the redshift is cosmological – due to expansion of space – NOT due to the Doppler Effect, so z is not equal to v/c In fact, 1/1+z is the ...
... Usually, z = v/c and so z = 0.2 20% speed of light But quasars with z = 6 have been found. This does NOT mean a velocity = 6x the speed of light!!! Why? Because the redshift is cosmological – due to expansion of space – NOT due to the Doppler Effect, so z is not equal to v/c In fact, 1/1+z is the ...
PH607lec08
... point . • Cores may exhibit unusual kinematics; for example, about a quarter of all elliptical galaxies have cores which appear to counter-rotate with respect to the rest of the galaxy . • Although such `kinematically decoupled' cores are generally not photometrically distinct, several E galaxies wi ...
... point . • Cores may exhibit unusual kinematics; for example, about a quarter of all elliptical galaxies have cores which appear to counter-rotate with respect to the rest of the galaxy . • Although such `kinematically decoupled' cores are generally not photometrically distinct, several E galaxies wi ...
Cataclysmic Cosmic Events and How to Observe Them www.springer.com/series/5338
... those telescopes took hours to reach such limits, and then the photographic plates had to be developed, fixed, and examined by eye. In the modern era digital images can be obtained in minutes and analyzed ‘on the fly’ while more images are being downloaded. Developments can be e-mailed to other inte ...
... those telescopes took hours to reach such limits, and then the photographic plates had to be developed, fixed, and examined by eye. In the modern era digital images can be obtained in minutes and analyzed ‘on the fly’ while more images are being downloaded. Developments can be e-mailed to other inte ...
WORD - Astrophysics
... overcome crowding, and a 100m class telescope is required to study the brighter galaxies at their half-light radius - without it work is limited to the less representative outer regions where crowding is less of an issue. The more luminous elliptical ...
... overcome crowding, and a 100m class telescope is required to study the brighter galaxies at their half-light radius - without it work is limited to the less representative outer regions where crowding is less of an issue. The more luminous elliptical ...
Ch. 16 - Astro1010
... Once many stars are plotted on an H–R diagram, a pattern begins to form. These are the 80 closest stars to us; note the dashed lines of constant radius. The darkened band is called the main sequence, as this is where most stars are. ...
... Once many stars are plotted on an H–R diagram, a pattern begins to form. These are the 80 closest stars to us; note the dashed lines of constant radius. The darkened band is called the main sequence, as this is where most stars are. ...
Lecture 14
... • The process of measuring the apparent brightnesses of objects is called Photometry. • Two ways to express apparent brightness: – as Stellar Magnitudes – as Absolute Fluxes (energy per second per area) ...
... • The process of measuring the apparent brightnesses of objects is called Photometry. • Two ways to express apparent brightness: – as Stellar Magnitudes – as Absolute Fluxes (energy per second per area) ...
Observational Data
... 1) actively star forming galaxies (>100-500Mo/yr) 2) irregular light distribution, clumpy SF regions, high detected asymmetries, ongoing mergers? 3) low light concentration similar to local starbursts and ULIRGs 4) old underlyings, half light radii~6kpc (large) ...
... 1) actively star forming galaxies (>100-500Mo/yr) 2) irregular light distribution, clumpy SF regions, high detected asymmetries, ongoing mergers? 3) low light concentration similar to local starbursts and ULIRGs 4) old underlyings, half light radii~6kpc (large) ...
Age-Dating of Young Stars and Stellar Systems
... massive-star population of single age, stars with vastly different zero-age-mainsequence masses can have similar Teff and L and contribute to the integrated light. Any age determination is therefore dependent on an assumption on the IMF. Since massive stars are rare and have much larger luminosities ...
... massive-star population of single age, stars with vastly different zero-age-mainsequence masses can have similar Teff and L and contribute to the integrated light. Any age determination is therefore dependent on an assumption on the IMF. Since massive stars are rare and have much larger luminosities ...
ALFALFA H-alpha: The Star-Formation-Rate Density
... For astronomers studying past star-formation rates (SFRs), distances play the role of a time machine. Light travels at a finite speed; it travels slowly enough that astronomers can still view light from the Big Bang. Light emitted by the Sun takes more than eight minutes to reach Earth, roughly five ...
... For astronomers studying past star-formation rates (SFRs), distances play the role of a time machine. Light travels at a finite speed; it travels slowly enough that astronomers can still view light from the Big Bang. Light emitted by the Sun takes more than eight minutes to reach Earth, roughly five ...
Finnish Centre for Astronomy with ESO
... Within the GAMA survey, a large multi-wavelength study of 250,000 galaxies in the local universe, Roberto De Propris and his co-workers have been studying the galaxy merger rate via the fraction of objects in close pairs. Using the large GAMA dataset, they have measured how the merger fraction depen ...
... Within the GAMA survey, a large multi-wavelength study of 250,000 galaxies in the local universe, Roberto De Propris and his co-workers have been studying the galaxy merger rate via the fraction of objects in close pairs. Using the large GAMA dataset, they have measured how the merger fraction depen ...
Chapter 16--Properties of Stars
... Despite these similarities, stars appear different from one another for two primary reasons: They differ in mass, and we see different stars at different stages of their lives. The key that finally unlocked these secrets of stars was an appropriate classification system. Before the twentieth century ...
... Despite these similarities, stars appear different from one another for two primary reasons: They differ in mass, and we see different stars at different stages of their lives. The key that finally unlocked these secrets of stars was an appropriate classification system. Before the twentieth century ...
The Milky Way - The Independent School
... of galaxies visible in the sky. This chapter will expand your horizon to discuss the different kinds of galaxies and their complex histories. Here you can expect answers to five essential questions: • What do galaxies look like? • How do astronomers measure the distances to galaxies? ...
... of galaxies visible in the sky. This chapter will expand your horizon to discuss the different kinds of galaxies and their complex histories. Here you can expect answers to five essential questions: • What do galaxies look like? • How do astronomers measure the distances to galaxies? ...
Archaeoastronomical Study of the Main Pyramids of Giza
... (see Belmonte, Shaltout, & Fekri, 2008, and references therein). It was well documented that, as early as the Middle Kingdom, the Egyptian astronomers were able to track the movements (recording the times of rising, culmination, setting, the period of invisibility and so on) of a set of 36 stars, or ...
... (see Belmonte, Shaltout, & Fekri, 2008, and references therein). It was well documented that, as early as the Middle Kingdom, the Egyptian astronomers were able to track the movements (recording the times of rising, culmination, setting, the period of invisibility and so on) of a set of 36 stars, or ...
Chapter 1 The Discovery of Open Clusters - Willmann-Bell
... was obtained by Dr. William Watson, who sent it to his friend William Herschel (1738–1822). Herschel is one of the most remarkable figures in the history of astronomy. Born in Hanover Germany, he moved to England in November 1757; eventually settling in Bath, where he was joined by his sister Caroli ...
... was obtained by Dr. William Watson, who sent it to his friend William Herschel (1738–1822). Herschel is one of the most remarkable figures in the history of astronomy. Born in Hanover Germany, he moved to England in November 1757; eventually settling in Bath, where he was joined by his sister Caroli ...
Jupiter from 1927 to 2026
... Finding your Natal Jupiter Some years Jupiter retrograded back into the previous sign, so be sure to note the dates to locate the sign of Jupiter during that year to find where Jupiter was at the time of your birth. On the days that Jupiter is changing signs the only way to know for sure is to have ...
... Finding your Natal Jupiter Some years Jupiter retrograded back into the previous sign, so be sure to note the dates to locate the sign of Jupiter during that year to find where Jupiter was at the time of your birth. On the days that Jupiter is changing signs the only way to know for sure is to have ...
What Can You See With a Telescope
... Asteroid Brightness—Another Factor to Consider The size of the majority of asteroids is quite small, but that is not the whole story. An asteroid’s brightness varies according to its orbital position and its distance from Earth. It also depends on what is on its surface. Another factor is the shape ...
... Asteroid Brightness—Another Factor to Consider The size of the majority of asteroids is quite small, but that is not the whole story. An asteroid’s brightness varies according to its orbital position and its distance from Earth. It also depends on what is on its surface. Another factor is the shape ...
Aries (constellation)
Aries is one of the constellations of the zodiac. It is located in the northern celestial hemisphere between Pisces to the west and Taurus to the east. The name Aries is Latin for ram, and its symbol is 20px (Unicode ♈), representing a ram's horns. It is one of the 48 constellations described by the 2nd century astronomer Ptolemy, and remains one of the 88 modern constellations. It is a mid-sized constellation, ranking 39th overall size, with an area of 441 square degrees (1.1% of the celestial sphere).Although Aries came to represent specifically the ram whose fleece became the Golden Fleece of Ancient Greek mythology, it has represented a ram since late Babylonian times. Before that, the stars of Aries formed a farmhand. Different cultures have incorporated the stars of Aries into different constellations including twin inspectors in China and a porpoise in the Marshall Islands. Aries is a relatively dim constellation, possessing only four bright stars: Hamal (Alpha Arietis, second magnitude), Sheratan (Beta Arietis, third magnitude), Mesarthim (Gamma Arietis, fourth magnitude), and 41 Arietis (also fourth magnitude). The few deep-sky objects within the constellation are quite faint and include several pairs of interacting galaxies. Several meteor showers appear to radiate from Aries, including the Daytime Arietids and the Epsilon Arietids.