- ORIGINS Space Telescope
... Origins Space Telescope: Cosmology and Reionization Joaquin Vieira (University of Illinois) for the Origins Space Telescope Science and Technology Definition Team ABSTRACT — The Origins Space Telescope (OST) is the mission concept for the Far-Infrared Surveyor, a study in development by NASA in prep ...
... Origins Space Telescope: Cosmology and Reionization Joaquin Vieira (University of Illinois) for the Origins Space Telescope Science and Technology Definition Team ABSTRACT — The Origins Space Telescope (OST) is the mission concept for the Far-Infrared Surveyor, a study in development by NASA in prep ...
The Hubble Mission - Indiana University Astronomy
... • A gamma-ray burst detected on 21 November 2001 by satellite • Hubble followed the fading optical counterpart from Dec. 4, 2001, to May 5, 2002 • At least some of the mysterious cosmic gamma-ray bursts are produced in the violent event which ends the lives of massive stars • These stars end in rapi ...
... • A gamma-ray burst detected on 21 November 2001 by satellite • Hubble followed the fading optical counterpart from Dec. 4, 2001, to May 5, 2002 • At least some of the mysterious cosmic gamma-ray bursts are produced in the violent event which ends the lives of massive stars • These stars end in rapi ...
ppt - MIT Haystack Observatory
... flaring introduces variability in correlated Lx-Lr which increases the spread , but generally falls within the order of magnitude range of GB relation radio variability appears to be a larger factor than X-ray variability there are situations where even these well-understood (?!) systems belie our e ...
... flaring introduces variability in correlated Lx-Lr which increases the spread , but generally falls within the order of magnitude range of GB relation radio variability appears to be a larger factor than X-ray variability there are situations where even these well-understood (?!) systems belie our e ...
15-3 Notes: Galaxies
... Irregular galaxies are galaxies that have no definite shape. The smallest irregular galaxies have only about 10 million stars. The largest irregular galaxies can contain several billion stars. Galaxies contain not only stars and planetary systems. Large features, such as gas clouds and star clusters ...
... Irregular galaxies are galaxies that have no definite shape. The smallest irregular galaxies have only about 10 million stars. The largest irregular galaxies can contain several billion stars. Galaxies contain not only stars and planetary systems. Large features, such as gas clouds and star clusters ...
What kind of stuff
... • Emission lines arise from gas “ionized” by very energetic radiation • Such high energy radiation is NOT produced by cold old stars, implying that very young stars (10 million years old) are present. • They also contain vast amounts of gas and dust ...
... • Emission lines arise from gas “ionized” by very energetic radiation • Such high energy radiation is NOT produced by cold old stars, implying that very young stars (10 million years old) are present. • They also contain vast amounts of gas and dust ...
Lecture2 - UCSB Physics
... • Emission lines arise from gas “ionized” by very energetic radiation • Such high energy radiation is NOT produced by cold old stars, implying that very young stars (10 million years old) are present. • They also contain vast amounts of gas and dust ...
... • Emission lines arise from gas “ionized” by very energetic radiation • Such high energy radiation is NOT produced by cold old stars, implying that very young stars (10 million years old) are present. • They also contain vast amounts of gas and dust ...
Chapter 23 The Milky Way Galaxy
... rather than as structures made up of particular stars, may be understood using a traffic jam as an analogy. The jam persists even though particular cars move in and out of it, and it can persist long after the event that triggered it is over. ...
... rather than as structures made up of particular stars, may be understood using a traffic jam as an analogy. The jam persists even though particular cars move in and out of it, and it can persist long after the event that triggered it is over. ...
Spiral Galaxies - Astronomy Centre
... focus attention on the nebulae • The debate was resolved in 1924 by Edwin Hubble who used the Mt Wilson 100-inch telescope to observe Cepheid variable stars in the Andromeda Nebula • Using the period-luminosity relation for these stars, and comparing with their observed (apparent) brightness, Hubble ...
... focus attention on the nebulae • The debate was resolved in 1924 by Edwin Hubble who used the Mt Wilson 100-inch telescope to observe Cepheid variable stars in the Andromeda Nebula • Using the period-luminosity relation for these stars, and comparing with their observed (apparent) brightness, Hubble ...
Document
... between yearly epochs at the 5 level with the CFHT Legacy Survey optical catalog. • Rule out sources with optical hosts with the colors and morphology of a star or quasar. • Follow up galaxy hosts that do not have an hard X-ray detection with optical spectroscopy to look for signs of an AGN. • Trig ...
... between yearly epochs at the 5 level with the CFHT Legacy Survey optical catalog. • Rule out sources with optical hosts with the colors and morphology of a star or quasar. • Follow up galaxy hosts that do not have an hard X-ray detection with optical spectroscopy to look for signs of an AGN. • Trig ...
3. Cosmology and the Origin and Evolution of Galaxies
... more than 60% of the brightest mm galaxies lie between redshifts z =1.8 - 3.58,9. If we take into account the small fraction (< 10%) of the sub-mm background that corresponds to these bright sub-mm sources, however, it is immediately apparent that some other method has to be found in order to measur ...
... more than 60% of the brightest mm galaxies lie between redshifts z =1.8 - 3.58,9. If we take into account the small fraction (< 10%) of the sub-mm background that corresponds to these bright sub-mm sources, however, it is immediately apparent that some other method has to be found in order to measur ...
The Milky Way
... Why can't we see visible radiation from the central region of the galaxy? 1. No visible light is emitted by the central region of the galaxy. 2. Interstellar dust blocks our view. 3. Too many stars are in the way. 4. Gravity curves the light away from the earth and Sun. ...
... Why can't we see visible radiation from the central region of the galaxy? 1. No visible light is emitted by the central region of the galaxy. 2. Interstellar dust blocks our view. 3. Too many stars are in the way. 4. Gravity curves the light away from the earth and Sun. ...
Diffuse Ultraviolet Emission in Galaxies
... of UV radiation each star produces. We focused on the hottest, most massive stars, which are the only ones capable of producing large amounts of UV radiation. We divided these stars into two groups, using their traditional names: “O-type” stars, with initial masses >20 Msun and lifespans < 5 Myr, a ...
... of UV radiation each star produces. We focused on the hottest, most massive stars, which are the only ones capable of producing large amounts of UV radiation. We divided these stars into two groups, using their traditional names: “O-type” stars, with initial masses >20 Msun and lifespans < 5 Myr, a ...
Research Topic: Supernovae
... Ib/c and Type II supernovas with HII regions in spiral and irregular galaxies • Determining if there is any difference between Type Ib/c and Type II progenitors ...
... Ib/c and Type II supernovas with HII regions in spiral and irregular galaxies • Determining if there is any difference between Type Ib/c and Type II progenitors ...
Pre-Lab
... category including gaseous nebulae, planetary nebulae, hazy star clusters, and faint lens-shaped formations. If these objects were nearby, with distances comparable to those of observable stars, they would have to be luminous clouds of gas within our Galaxy. If they were very remote, far beyond the ...
... category including gaseous nebulae, planetary nebulae, hazy star clusters, and faint lens-shaped formations. If these objects were nearby, with distances comparable to those of observable stars, they would have to be luminous clouds of gas within our Galaxy. If they were very remote, far beyond the ...
22 pm - Starmap
... Using binoculars, preferably with a tripod, will considerably enhance your star gazing experience. Many deep sky objects like galaxies and clusters will be within reach. Jupiter satellites and Saturn’s rings will also be visible. A spectacular experience for beginners in astronomy... Avoid the night ...
... Using binoculars, preferably with a tripod, will considerably enhance your star gazing experience. Many deep sky objects like galaxies and clusters will be within reach. Jupiter satellites and Saturn’s rings will also be visible. A spectacular experience for beginners in astronomy... Avoid the night ...
Properties of Supernovae
... Supernova explosions are the most powerful events in the Universe. In less than a second, about 1044 Joules of energy are released---about the same as the Sun has released in its entire lifetime! The explosion results from the death of a massive star which has consumed its entire fuel supply. The ap ...
... Supernova explosions are the most powerful events in the Universe. In less than a second, about 1044 Joules of energy are released---about the same as the Sun has released in its entire lifetime! The explosion results from the death of a massive star which has consumed its entire fuel supply. The ap ...
Astronomical Distance Ladder
... This proper motion technique is capable of giving reliable distances up to around 800 parsecs. With the distances to many stars in the galaxy calculated by parallax different ways to calculate distance was needed to extend the astronomical distance ladder. It was also discovered that stars radiated ...
... This proper motion technique is capable of giving reliable distances up to around 800 parsecs. With the distances to many stars in the galaxy calculated by parallax different ways to calculate distance was needed to extend the astronomical distance ladder. It was also discovered that stars radiated ...
Absolute Magnitudes of Supernovae
... supernovae are a particular type of exploding star that contains no hydrogen lines in its spectrum). The units on the x-axis are days, and on the y-axis are apparent magnitude. Each supernova was monitored for several weeks so that its rise to maximum light and its subsequent decline in brightness w ...
... supernovae are a particular type of exploding star that contains no hydrogen lines in its spectrum). The units on the x-axis are days, and on the y-axis are apparent magnitude. Each supernova was monitored for several weeks so that its rise to maximum light and its subsequent decline in brightness w ...
DTU_9e_ch14 - USD Home Pages
... Swirling around a 300-million-solar-mass black hole in the center of the galaxy NGC 7052, this disk of gas and dust is 3700 ly across. The gas is cascading into the black hole, which will consume it all over the next few billion years. The black hole appears bright because of light emitted by the ho ...
... Swirling around a 300-million-solar-mass black hole in the center of the galaxy NGC 7052, this disk of gas and dust is 3700 ly across. The gas is cascading into the black hole, which will consume it all over the next few billion years. The black hole appears bright because of light emitted by the ho ...
Program_files/40 Years of Microquasarsembed
... • Term first used by Martin Elvis 1984 “Microquasars and the Xray Background” (Weak AGN) • First used in the context of Xray binaries: Geldzahler, Fomalont and Cohen 1984, “Sco X-1 The Microquasar” • Now thought to be unrelated ...
... • Term first used by Martin Elvis 1984 “Microquasars and the Xray Background” (Weak AGN) • First used in the context of Xray binaries: Geldzahler, Fomalont and Cohen 1984, “Sco X-1 The Microquasar” • Now thought to be unrelated ...
The kinematics of Galaxies in Compact Groups
... agreement does not tell us much about the DM (outer halo). ...
... agreement does not tell us much about the DM (outer halo). ...
Research proposal uploaded for ESO fellowship
... How common are luminous Infrared galaxies at high-redshift? Are they representative of the entire high-redshift galaxy population? Are they Milky-Way progenitors? Galaxy formation models have shown to be very successful in explaining statistically, the properties of galaxies, suggesting that the phy ...
... How common are luminous Infrared galaxies at high-redshift? Are they representative of the entire high-redshift galaxy population? Are they Milky-Way progenitors? Galaxy formation models have shown to be very successful in explaining statistically, the properties of galaxies, suggesting that the phy ...
The Milky Way Galaxy
... gas. This gas is extremely heavily polluted by eject a from stars: if it were compressed to the density of air (i.e., by a factor ~ 1021 ) one could see only a few cm through it because light is absorbed by particles of dust (a better name might be smoke) suspended in the gas. Even at the extremely ...
... gas. This gas is extremely heavily polluted by eject a from stars: if it were compressed to the density of air (i.e., by a factor ~ 1021 ) one could see only a few cm through it because light is absorbed by particles of dust (a better name might be smoke) suspended in the gas. Even at the extremely ...
PPT 15MB - HubbleSOURCE
... Amazing network of long, straight filaments seen in great detail for first time in ionized gas; some of them follow magnetic field lines; New compact nebulae discovered with young massive stars, ranging from early to late stages of star formation Many candidate massive stars identified by brig ...
... Amazing network of long, straight filaments seen in great detail for first time in ionized gas; some of them follow magnetic field lines; New compact nebulae discovered with young massive stars, ranging from early to late stages of star formation Many candidate massive stars identified by brig ...
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.