Learning goals for Astronomy`s Final 2013
... Describe the Doppler shift, which is produced when a wave source moves relative to receptor Interpret Doppler diagrams Tell the difference between redshift and blueshift Describe how the Doppler shift is used on Astronomy o Ex. Be able to apply Doppler effect to explain the redshift in astronomy for ...
... Describe the Doppler shift, which is produced when a wave source moves relative to receptor Interpret Doppler diagrams Tell the difference between redshift and blueshift Describe how the Doppler shift is used on Astronomy o Ex. Be able to apply Doppler effect to explain the redshift in astronomy for ...
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 ...
30 Doradus - HubbleSOURCE
... where stars spend the majority of their life and where they convert H into He. ...
... where stars spend the majority of their life and where they convert H into He. ...
Robert_Minchin_Galaxies_2011_REU
... Measuring Dynamics • Dynamics can be measured by looking at emission and absorption lines from stars and star-forming regions, or from the gas in the ISM. • Dynamics for spiral and irregular galaxies are often measured using the 21-cm line of neutral hydrogen. • For elliptical and spheroidal galaxi ...
... Measuring Dynamics • Dynamics can be measured by looking at emission and absorption lines from stars and star-forming regions, or from the gas in the ISM. • Dynamics for spiral and irregular galaxies are often measured using the 21-cm line of neutral hydrogen. • For elliptical and spheroidal galaxi ...
PH607lec10-4gal2
... Half of all disk galaxies show a central bar which contains up to 1/3 of the total light Bars are almost as flat as surrounding disks. S0 galaxies can have bars – a bar can persist in the absence of gas Bar patterns are not static, they rotate with a pattern speed, but unlike spiral arms they are no ...
... Half of all disk galaxies show a central bar which contains up to 1/3 of the total light Bars are almost as flat as surrounding disks. S0 galaxies can have bars – a bar can persist in the absence of gas Bar patterns are not static, they rotate with a pattern speed, but unlike spiral arms they are no ...
Understanding the Astrophysics of Galaxy Evolution: the role of
... correlated with dark matter halo mass and so the best link to the underlying cosmological model. A survey must be large (∼ few ×105 galaxies) in order to disentangle covariances in the physical properties of galaxies. One reason it is so difficult to understand how galaxies form is because almost al ...
... correlated with dark matter halo mass and so the best link to the underlying cosmological model. A survey must be large (∼ few ×105 galaxies) in order to disentangle covariances in the physical properties of galaxies. One reason it is so difficult to understand how galaxies form is because almost al ...
9 Dwarf Galaxies
... resists the spiral’s tendency to wind up and causes a rigidly rotating spiral pattern Properties of spiral arms can be explained if they are not rotating with the stars, but rather density waves: • Spiral arms are locations where the stellar orbits are such that stars are more densely packed. • Gas ...
... resists the spiral’s tendency to wind up and causes a rigidly rotating spiral pattern Properties of spiral arms can be explained if they are not rotating with the stars, but rather density waves: • Spiral arms are locations where the stellar orbits are such that stars are more densely packed. • Gas ...
exam 3 review lecture
... Neutron stars can spin very rapidly, so these pulses can be quite close together in time! ...
... Neutron stars can spin very rapidly, so these pulses can be quite close together in time! ...
1. setting the scene 2. the cosmic dark ages and the first stars
... star. These familiar forms of matter, which astronomers often refer to as baryons, make up only about 1/6 of the total matter content of the Universe. The other 5/6 is presumed to be some as yet unidentified form of matter which does not interact with light — hence the term ‘dark matter’, but whose ...
... star. These familiar forms of matter, which astronomers often refer to as baryons, make up only about 1/6 of the total matter content of the Universe. The other 5/6 is presumed to be some as yet unidentified form of matter which does not interact with light — hence the term ‘dark matter’, but whose ...
Sample Exam for 3 rd Astro Exam
... A. In the galactic halo. B. In the galactic nuclear bulge C. Beyond the Sun above and below the galactic mid-plane D. Perpendicular to the galactic plane. E. In the galactic mid-plane 16. True or false: The Sun is located within the galactic gas layer of the Milky Way A. True B. False C. I have no @ ...
... A. In the galactic halo. B. In the galactic nuclear bulge C. Beyond the Sun above and below the galactic mid-plane D. Perpendicular to the galactic plane. E. In the galactic mid-plane 16. True or false: The Sun is located within the galactic gas layer of the Milky Way A. True B. False C. I have no @ ...
Cosmology with GMRT
... – Apply to a single object (optical results are averages over large redshift range) – Not subject to the same systematics – Currently probe a complementary redshift range ...
... – Apply to a single object (optical results are averages over large redshift range) – Not subject to the same systematics – Currently probe a complementary redshift range ...
... of energy from a tiny region in their core • Emitted radiation usually fluctuates • In many instances intense radio emission and other activity exists well outside the galaxy • Centers of active galaxies referred to as AGNs – active galactic nuclei • 10% of all galaxies are active • Three overlappin ...
21. Galaxy Evolution Agenda The Monty Hall Problem/Paradox 21.1
... • Schmidt realized that the emission lines belonged to Hydrogen, but they were highly redshifted. • This object is very (> 1010 light years) far away. • other such objects were subsequently discovered • they were called quasi-stellar radio sources or quasars for short ...
... • Schmidt realized that the emission lines belonged to Hydrogen, but they were highly redshifted. • This object is very (> 1010 light years) far away. • other such objects were subsequently discovered • they were called quasi-stellar radio sources or quasars for short ...
Lecture-25 Notes - Georgia Southern University Astrophysics
... These massive galaxies (and their super-massive black holes) had formed before the universe was 1-billion years old!! A z = 7.1 QSO has recently been discovered. It formed ~300-million years after the creation of the universe!! ...
... These massive galaxies (and their super-massive black holes) had formed before the universe was 1-billion years old!! A z = 7.1 QSO has recently been discovered. It formed ~300-million years after the creation of the universe!! ...
NGC 1808 - Rencontres de Moriond
... photons producing the observed emission line spectrum, and no more than 1/10 of the observed FIR luminosity. ...
... photons producing the observed emission line spectrum, and no more than 1/10 of the observed FIR luminosity. ...
Full Poster - Cool Cosmos
... moon rocks, astronomers must rely on collecting and analyzing the faint light from distant objects in order to study the cosmos. This fact is even more remarkable when you consider the vastness of space. Light may travel for billions of years before reaching our telescopes. Astronomy is primarily a ...
... moon rocks, astronomers must rely on collecting and analyzing the faint light from distant objects in order to study the cosmos. This fact is even more remarkable when you consider the vastness of space. Light may travel for billions of years before reaching our telescopes. Astronomy is primarily a ...
An introduce of the spectrograph of the GALEX
... but has remained nearly constant for red galaxies. These results imply that the number and total stellar mass of blue galaxies have been substantially constant since z~1, whereas those of red galaxies (near L*) have been significantly rising. To explain the new red galaxies, a ``mixed'' scenario is ...
... but has remained nearly constant for red galaxies. These results imply that the number and total stellar mass of blue galaxies have been substantially constant since z~1, whereas those of red galaxies (near L*) have been significantly rising. To explain the new red galaxies, a ``mixed'' scenario is ...
–1– 2. Milky Way We know a great deal, perhaps more than any
... • A similar, but much larger survey of nearby stars was done by Kapteyn around 1920. He used parallax, proper motions, radial velocities and spectra to infer the distance to stars. He inferred that the size of the MW is about 10 kpc, and the MW is flattened with an axial ratio of 1/5. The Sun is abo ...
... • A similar, but much larger survey of nearby stars was done by Kapteyn around 1920. He used parallax, proper motions, radial velocities and spectra to infer the distance to stars. He inferred that the size of the MW is about 10 kpc, and the MW is flattened with an axial ratio of 1/5. The Sun is abo ...
PH607lec12
... behind, instead of the same redshifts proportional to distance in all directions (Universe is isotropic). Thus we can measure our motion relative to the Hubble flow, which is also our motion relative to the observable Universe. A comoving observer is at rest in this special frame of reference. Our ...
... behind, instead of the same redshifts proportional to distance in all directions (Universe is isotropic). Thus we can measure our motion relative to the Hubble flow, which is also our motion relative to the observable Universe. A comoving observer is at rest in this special frame of reference. Our ...
Starburst Galaxies Under the Microscope: High
... sources of excitation can be spatially resolved. Both of these require high spatial resolution and will be discussed in some detail in the following sections. ...
... sources of excitation can be spatially resolved. Both of these require high spatial resolution and will be discussed in some detail in the following sections. ...
Ecosystems, from life, to the Earth, to the Galaxy
... independently of another. For instance, even geological processes are influenced by carbon deposition in limestone, built-up ultimately from that provided by the biota, as part of the endogenic cycle. The Gaia hypothesis (Lovelock 1995) has often been misinterpreted as implying that the Earth is ali ...
... independently of another. For instance, even geological processes are influenced by carbon deposition in limestone, built-up ultimately from that provided by the biota, as part of the endogenic cycle. The Gaia hypothesis (Lovelock 1995) has often been misinterpreted as implying that the Earth is ali ...
20 pm - Starmap
... A large globular cluster in Sagittarius, with a loose arrangement of stars. A good candidate for astrophotography. ...
... A large globular cluster in Sagittarius, with a loose arrangement of stars. A good candidate for astrophotography. ...
Gamma-ray burst
Gamma-ray bursts (GRBs) are flashes of gamma rays associated with extremely energetic explosions that have been observed in distant galaxies. They are the brightest electromagnetic events known to occur in the universe. Bursts can last from ten milliseconds to several hours. The initial burst is usually followed by a longer-lived ""afterglow"" emitted at longer wavelengths (X-ray, ultraviolet, optical, infrared, microwave and radio).Most observed GRBs are believed to consist of a narrow beam of intense radiation released during a supernova or hypernova as a rapidly rotating, high-mass star collapses to form a neutron star, quark star, or black hole. A subclass of GRBs (the ""short"" bursts) appear to originate from a different process – this may be due to the merger of binary neutron stars. The cause of the precursor burst observed in some of these short events may be due to the development of a resonance between the crust and core of such stars as a result of the massive tidal forces experienced in the seconds leading up to their collision, causing the entire crust of the star to shatter.The sources of most GRBs are billions of light years away from Earth, implying that the explosions are both extremely energetic (a typical burst releases as much energy in a few seconds as the Sun will in its entire 10-billion-year lifetime) and extremely rare (a few per galaxy per million years). All observed GRBs have originated from outside the Milky Way galaxy, although a related class of phenomena, soft gamma repeater flares, are associated with magnetars within the Milky Way. It has been hypothesized that a gamma-ray burst in the Milky Way, pointing directly towards the Earth, could cause a mass extinction event.GRBs were first detected in 1967 by the Vela satellites, a series of satellites designed to detect covert nuclear weapons tests. Hundreds of theoretical models were proposed to explain these bursts in the years following their discovery, such as collisions between comets and neutron stars. Little information was available to verify these models until the 1997 detection of the first X-ray and optical afterglows and direct measurement of their redshifts using optical spectroscopy, and thus their distances and energy outputs. These discoveries, and subsequent studies of the galaxies and supernovae associated with the bursts, clarified the distance and luminosity of GRBs. These facts definitively placed them in distant galaxies and also connected long GRBs with the explosion of massive stars, the only possible source for the energy outputs observed.