The Intricate Role of Cold Gas and Dust in Galaxy Evolution at Early
... ! how can we measure dust-obscured part of the cosmic SF history?! ...
... ! how can we measure dust-obscured part of the cosmic SF history?! ...
Galaxies * Island universes
... Disk formed from later infalling gas of higher angular momentum, which dissipates against itself to settle into a thin disk A Galaxy’s color evolves from bluer, towards redder as stellar population ages, young blue stars die out Galaxy collisions common because they’re usually only 100 or fewer gala ...
... Disk formed from later infalling gas of higher angular momentum, which dissipates against itself to settle into a thin disk A Galaxy’s color evolves from bluer, towards redder as stellar population ages, young blue stars die out Galaxy collisions common because they’re usually only 100 or fewer gala ...
Lecture 17
... Blazars are a class of AGN that are radio sources and consist of both Optically Violent Variables (OVVs) and BL Lac objects (sources showing a featureless optical spectrum) and Flat Spectrum Radio Quasars (sources showing strong and broad emission lines) ...
... Blazars are a class of AGN that are radio sources and consist of both Optically Violent Variables (OVVs) and BL Lac objects (sources showing a featureless optical spectrum) and Flat Spectrum Radio Quasars (sources showing strong and broad emission lines) ...
supernova remnants: a link between massive stars and the
... (BSG) and became the prototype of the SN 1987Alike class. Models show that the progenitor could have been a ∼ 18M star in which the envelope mass is greater than the core mass, although there has been some mass loss (Chevalier 2005). The BSG circumstellar medium is complex, as can be seen from the ...
... (BSG) and became the prototype of the SN 1987Alike class. Models show that the progenitor could have been a ∼ 18M star in which the envelope mass is greater than the core mass, although there has been some mass loss (Chevalier 2005). The BSG circumstellar medium is complex, as can be seen from the ...
Stars: Their Life and Afterlife
... but gravity is negligible in this context). Because the weak force is so, well, weak, they rarely interact with other particles of matter. They play an important role in transporting energy out (cooling) of the cores of massive stars (both during late stages of evolution and supernovae) for this rea ...
... but gravity is negligible in this context). Because the weak force is so, well, weak, they rarely interact with other particles of matter. They play an important role in transporting energy out (cooling) of the cores of massive stars (both during late stages of evolution and supernovae) for this rea ...
First Light Sources at the End of the Dark Ages: Direct
... Photometric redshifts, combined with spectroscopic follow-up with JWST or GSMT, will allow the identification the most luminous sources at specific redshifts in the range 7 < z < 11, such as z ~ 7.7, where Lyman ! falls in an atmospheric window between night sky lines. By using narrow band imaging ( ...
... Photometric redshifts, combined with spectroscopic follow-up with JWST or GSMT, will allow the identification the most luminous sources at specific redshifts in the range 7 < z < 11, such as z ~ 7.7, where Lyman ! falls in an atmospheric window between night sky lines. By using narrow band imaging ( ...
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Gugus Bintang [Compatibility Mode]
... 2. Identify stellar types (such as blue giant stars and red giant stars), determine luminosity from the type, measure brightness, and then calculate distance. If the giant star is in a cluster, then we can determine the distance to the cluster by using several giant stars in the cluster to get its d ...
... 2. Identify stellar types (such as blue giant stars and red giant stars), determine luminosity from the type, measure brightness, and then calculate distance. If the giant star is in a cluster, then we can determine the distance to the cluster by using several giant stars in the cluster to get its d ...
Section 4 Formation of the Universe Chapter 19
... universe began with a tremendous explosion is called the big bang theory. • Cosmic Background Radiation In 1964, two scientists using a huge antenna accidentally found radiation coming from all directions in space. One explanation for this radiation is that it is cosmic background radiation left ove ...
... universe began with a tremendous explosion is called the big bang theory. • Cosmic Background Radiation In 1964, two scientists using a huge antenna accidentally found radiation coming from all directions in space. One explanation for this radiation is that it is cosmic background radiation left ove ...
On the nature of early-type emission line objects in NGC6611
... With WFI, we obtained ∼15000 spectra of the sources in NGC6611 and its surrounding field. Due to the fact that WFI in slitless mode is not sensitive to the ambient nebular emission, we listed the stars with and without circumstellar (CS) emission. However, this slitless mode cannot show the faint CS ...
... With WFI, we obtained ∼15000 spectra of the sources in NGC6611 and its surrounding field. Due to the fact that WFI in slitless mode is not sensitive to the ambient nebular emission, we listed the stars with and without circumstellar (CS) emission. However, this slitless mode cannot show the faint CS ...
astro2_lec1 - Astronomy & Astrophysics Group
... distances to dozens of nebulae. Even the nearest, in Andromeda, was millions of light ...
... distances to dozens of nebulae. Even the nearest, in Andromeda, was millions of light ...
Galaxies
... Modeling such collisions on a computer shows that two spiral galaxies can merge to make an elliptical ...
... Modeling such collisions on a computer shows that two spiral galaxies can merge to make an elliptical ...
It`s cosmic! - NSW Department of Education
... Each galaxy is a very large spinning structure. It contains billions of stars. It also contains clouds of gas and dust called nebulas. Some of the stars, like our Sun, have planets. All these things are held together in each galaxy by gravitational forces. (You feel a gravitational force on Earth. I ...
... Each galaxy is a very large spinning structure. It contains billions of stars. It also contains clouds of gas and dust called nebulas. Some of the stars, like our Sun, have planets. All these things are held together in each galaxy by gravitational forces. (You feel a gravitational force on Earth. I ...
AST1100 Lecture Notes
... normal ratio, and we have no reason to believe otherwise, then the planets can only explain a tiny part of the invisible matter. Brown dwarf stars (more about these in later lectures) are stars which had too little mass to start nuclear reactions. They emit thermal radiation, but their temperature i ...
... normal ratio, and we have no reason to believe otherwise, then the planets can only explain a tiny part of the invisible matter. Brown dwarf stars (more about these in later lectures) are stars which had too little mass to start nuclear reactions. They emit thermal radiation, but their temperature i ...
Supernovae and cosmology
... Pressure increases on gas surrounding core Potential energy is released as heat ...
... Pressure increases on gas surrounding core Potential energy is released as heat ...
presentation (PPT format)
... have their own motions relative to one another thanks to their mutual gravitational attraction-for distant galaxies the Hubble speed is much greater than any intrinsic motions that the galaxies might have • The value of H0? Depends on the determination of the distance (vary depending on the techniqu ...
... have their own motions relative to one another thanks to their mutual gravitational attraction-for distant galaxies the Hubble speed is much greater than any intrinsic motions that the galaxies might have • The value of H0? Depends on the determination of the distance (vary depending on the techniqu ...
Blowin` in the wind: both `negative` and `positive` feedback in an
... 320 km/s) is consistent with the systemic redshift of the host galaxy (Brusa et al. 2010), and it is interpreted as due to the star formation in the host galaxy. We map the spatial extent of the Hα narrow component by fitting in each spaxels of the datacube the single Gaussian derived from the integr ...
... 320 km/s) is consistent with the systemic redshift of the host galaxy (Brusa et al. 2010), and it is interpreted as due to the star formation in the host galaxy. We map the spatial extent of the Hα narrow component by fitting in each spaxels of the datacube the single Gaussian derived from the integr ...
Supermassive Black Holes and the Growth of Galaxies
... present observations have revealed two separate types of black holes. The first have relatively small masses, roughly tens of times that of the Sun, which we can observe in binary orbits around normal stars. In many such systems, the normal star has run out of hydrogen fuel in its core and begins to ...
... present observations have revealed two separate types of black holes. The first have relatively small masses, roughly tens of times that of the Sun, which we can observe in binary orbits around normal stars. In many such systems, the normal star has run out of hydrogen fuel in its core and begins to ...
lab 11 only - Penn State University
... spherical cloud of stars that surrounds the entire galaxy). The halo is much larger than the bulge. Our Milky Way Galaxy is made up of mostly stars, gas, and dust. The dust blocks out light from distant stars, and makes it hard to see a lot of the galaxy, especially the bulge and parts of the disk. ...
... spherical cloud of stars that surrounds the entire galaxy). The halo is much larger than the bulge. Our Milky Way Galaxy is made up of mostly stars, gas, and dust. The dust blocks out light from distant stars, and makes it hard to see a lot of the galaxy, especially the bulge and parts of the disk. ...
Structure of the solar system
... • The Milky Way is a disc galaxy with spiral arms • It contains about 200 billion stars ( 2 x 109 stars) •At the centre of our galaxy is a black hole with a mass of approx 100 million suns •It is 2000 ly thick and 100,000 ly long •The closest star in our galaxy, Proxima Centauri, is 4 ly away ...
... • The Milky Way is a disc galaxy with spiral arms • It contains about 200 billion stars ( 2 x 109 stars) •At the centre of our galaxy is a black hole with a mass of approx 100 million suns •It is 2000 ly thick and 100,000 ly long •The closest star in our galaxy, Proxima Centauri, is 4 ly away ...
VLT/FORS Surveys of Wolf-Rayet Stars beyond the
... past few years a direct connection has been established between certain Type Ic SNe and gamma-ray bursts (GRBs), supporting the collapsar model in which the GRB results from the death throes of a rapidly rotating WR star. Relative to lower-mass stars, the evolution of high-mass stars is complicated ...
... past few years a direct connection has been established between certain Type Ic SNe and gamma-ray bursts (GRBs), supporting the collapsar model in which the GRB results from the death throes of a rapidly rotating WR star. Relative to lower-mass stars, the evolution of high-mass stars is complicated ...
Chapter 6: Stellar Evolution (part 2)
... produced gamma rays become so energetic, their interaction with atomic nucleus can lead to the production of electron-position pairs. The pair production decreases the distance that gamma rays travel in the gas, which leads to an instability: as gamma ray travel distance decreases, the temperature a ...
... produced gamma rays become so energetic, their interaction with atomic nucleus can lead to the production of electron-position pairs. The pair production decreases the distance that gamma rays travel in the gas, which leads to an instability: as gamma ray travel distance decreases, the temperature a ...
Neutron Stars
... magnetic field lines, forming a radiation beam in parallel with the magnetic axis • The beam sweeps around the sky as the star rotates • If the Earth happens to lie in the path of the beam, the pulsar can be detected ...
... magnetic field lines, forming a radiation beam in parallel with the magnetic axis • The beam sweeps around the sky as the star rotates • If the Earth happens to lie in the path of the beam, the pulsar can be detected ...
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.