Galaxies
... underlying dark matter. We have started to understand how baryonic gas within the dark matter halos cools and collapses to form stars, and how the energy from star formation can feed back into the surrounding gas and regulate subsequent star formation. However, at a fundamental level we still lack a ...
... underlying dark matter. We have started to understand how baryonic gas within the dark matter halos cools and collapses to form stars, and how the energy from star formation can feed back into the surrounding gas and regulate subsequent star formation. However, at a fundamental level we still lack a ...
Gamma Ray Burst Afterglows and Host Galaxies
... Deaths of Massive Stars Afterglow data suggests that GRBs occur… • in galaxies with active star formation, • often in regions with a lot of gas, which is where new stars form and where the most massive stars spend their entire brief lives. However, GRBs are so rare that only a tiny fraction of massi ...
... Deaths of Massive Stars Afterglow data suggests that GRBs occur… • in galaxies with active star formation, • often in regions with a lot of gas, which is where new stars form and where the most massive stars spend their entire brief lives. However, GRBs are so rare that only a tiny fraction of massi ...
A catalogue of the Chandra Deep Field South with multi
... 3.1. Image reduction and object search All procedures used for the data reduction are based on the MIDAS package. A WFI image processing pipeline was developed by Wolf et al. (2001) and makes intensive use of programmes developed by K. Meisenheimer, H.-J. Röser and H. Hippelein for the Calar Alto D ...
... 3.1. Image reduction and object search All procedures used for the data reduction are based on the MIDAS package. A WFI image processing pipeline was developed by Wolf et al. (2001) and makes intensive use of programmes developed by K. Meisenheimer, H.-J. Röser and H. Hippelein for the Calar Alto D ...
EROs and submm galaxies: Expectations for FMOS in the
... formation. The starbursting EROs are sites of extreme star formation at moderate redshifts identification with submm sources below SCUBA confusion limit? sites of major mergers? ...
... formation. The starbursting EROs are sites of extreme star formation at moderate redshifts identification with submm sources below SCUBA confusion limit? sites of major mergers? ...
Chapter 20 Notes
... • Quasars may be infant galaxies. • In 1960, a faint object was matched with a strong radio signal. This object was called a quasar. ...
... • Quasars may be infant galaxies. • In 1960, a faint object was matched with a strong radio signal. This object was called a quasar. ...
Galaxies - hwchemistry
... of galaxies, however, they find that the measured masses are much larger than expected from the luminosities of the galaxies. • This seems to be true of most galaxies. – Measured masses of galaxies amount to 10 to 100 times more mass than you would expect from the appearance of galaxies. ...
... of galaxies, however, they find that the measured masses are much larger than expected from the luminosities of the galaxies. • This seems to be true of most galaxies. – Measured masses of galaxies amount to 10 to 100 times more mass than you would expect from the appearance of galaxies. ...
Article PDF - IOPscience
... galaxies, as seen through their stellar light distributions, contain enough physical information to offer this classification. We argue through the use of 240 images of nearby galaxies that three model-independent parameters measured on a single galaxy image reveal its major ongoing and past formation ...
... galaxies, as seen through their stellar light distributions, contain enough physical information to offer this classification. We argue through the use of 240 images of nearby galaxies that three model-independent parameters measured on a single galaxy image reveal its major ongoing and past formation ...
Quantitative constraints on starburst cycles in galaxies with stellar
... In Figure 2, we plot galaxies in the stellar mass range 109.75 −1010 M⊙ in the plane of log SFR/M∗ versus Dn (4000) and log SFR/M∗ versus HδA . We colour-code the points according to their classification: black refers to continuous, blue to ongoing burst and red to past burst. This particular mass r ...
... In Figure 2, we plot galaxies in the stellar mass range 109.75 −1010 M⊙ in the plane of log SFR/M∗ versus Dn (4000) and log SFR/M∗ versus HδA . We colour-code the points according to their classification: black refers to continuous, blue to ongoing burst and red to past burst. This particular mass r ...
25 Years of the Hubble Space Telescope - Speaker
... As a first example, this image of the Carina Nebula was released for Hubble’s 17th anniversary. At the time (2007), it was one of the largest panoramic images ever taken with Hubble’s Advanced Camera for Surveys. It is a 50-light-year-wide view of the central region of the Carina Nebula, where a mae ...
... As a first example, this image of the Carina Nebula was released for Hubble’s 17th anniversary. At the time (2007), it was one of the largest panoramic images ever taken with Hubble’s Advanced Camera for Surveys. It is a 50-light-year-wide view of the central region of the Carina Nebula, where a mae ...
Galaxies - WordPress.com
... A an enormous luminous cloud of gas and dust in the interstellar space. B a collection of planets with a parent star similar to the solar system. C a collection of hundreds of billions of stars sometimes called a galaxy. D a figment of the imagination of early astronomers like, the "seas" of the moo ...
... A an enormous luminous cloud of gas and dust in the interstellar space. B a collection of planets with a parent star similar to the solar system. C a collection of hundreds of billions of stars sometimes called a galaxy. D a figment of the imagination of early astronomers like, the "seas" of the moo ...
Astronomy and Astrophysics (ASTRO)
... mathematical and observational fundamentals associated with the origin, structure, and evolution of the Universe. Scale of the Universe, Hubble's Law, the cosmic microwave background, Big Bang nucleosynthesis, the origin of elements, dark energy and the accelerating universe, and dark matter. For se ...
... mathematical and observational fundamentals associated with the origin, structure, and evolution of the Universe. Scale of the Universe, Hubble's Law, the cosmic microwave background, Big Bang nucleosynthesis, the origin of elements, dark energy and the accelerating universe, and dark matter. For se ...
book_text4
... galaxies in the most distant reaches of the Universe. He started his career at the Royal Greenwich Observatory (RGO) in Herstmonceux, England in 1969 and was awarded his DPhil by the nearby University of Sussex in 1973. He then became one of the very first Research Fellows at the newly constructed A ...
... galaxies in the most distant reaches of the Universe. He started his career at the Royal Greenwich Observatory (RGO) in Herstmonceux, England in 1969 and was awarded his DPhil by the nearby University of Sussex in 1973. He then became one of the very first Research Fellows at the newly constructed A ...
A Spectroscopically Confirmed Excess of 24 micron Sources in a
... i.e. higher early-type fractions and lower mean star formation rates than the field (Zabludoff & Mulchaey 1998; Hashimoto et al. 1998; Tran et al. 2001; Blanton & Berlind 2007; Rasmussen et al. 2008). With the advent of large spectroscopic studies such as CNOC (Yee et al. 1996) and SDSS (Abazajian e ...
... i.e. higher early-type fractions and lower mean star formation rates than the field (Zabludoff & Mulchaey 1998; Hashimoto et al. 1998; Tran et al. 2001; Blanton & Berlind 2007; Rasmussen et al. 2008). With the advent of large spectroscopic studies such as CNOC (Yee et al. 1996) and SDSS (Abazajian e ...
The Swift satellite lives up to its name, revealing cosmic
... The old saying ‘the early bird catches the worm’ is never more true than when studying the most powerful explosions in the Universe - Gamma-ray Bursts. These monster events - second only to the Big Bang in energy release - are occurring every day all across the Universe, and were discovered accident ...
... The old saying ‘the early bird catches the worm’ is never more true than when studying the most powerful explosions in the Universe - Gamma-ray Bursts. These monster events - second only to the Big Bang in energy release - are occurring every day all across the Universe, and were discovered accident ...
Module 11.1.1: Galaxies: Morphology and the Hubble Sequence
... doesn't have a lot of active star formation. And just like other spiral galaxies, these S0's, or lenticulars, because their shape resembles a lens, could also contain bars. [slide 10] Among the ...
... doesn't have a lot of active star formation. And just like other spiral galaxies, these S0's, or lenticulars, because their shape resembles a lens, could also contain bars. [slide 10] Among the ...
Light on Dark Matter with Weak Gravitational Lensing
... Section 2 aims at giving an overview of weak gravitational lensing : the basics of the lensing theory and a brief description of the weak lensing data analysis. Section 3 will be dedicated to the presentation of the shear estimation problem. It requires the measurement of the shape of millions of ga ...
... Section 2 aims at giving an overview of weak gravitational lensing : the basics of the lensing theory and a brief description of the weak lensing data analysis. Section 3 will be dedicated to the presentation of the shear estimation problem. It requires the measurement of the shape of millions of ga ...
ASTRONOMY AND ASTROPHYSICS (ASTRO)
... stars, to understand the past and future of our Sun, the Milky Way galaxy and the other galaxies in the universe. Basic concepts of cosmology, dark matter and dark energy. Use of computer models to calculate the structure and evolution of stars and protostars, and to analyze actual astronomical data ...
... stars, to understand the past and future of our Sun, the Milky Way galaxy and the other galaxies in the universe. Basic concepts of cosmology, dark matter and dark energy. Use of computer models to calculate the structure and evolution of stars and protostars, and to analyze actual astronomical data ...
Lecture 2
... • Lyman- is characteristically asymmetric due to galaxyscale outflows • Absorption by the intervening IGM suppresses flux shortwards of Lyman- • The degree of suppression increases with redshift • This leads to a characteristic spectral break ...
... • Lyman- is characteristically asymmetric due to galaxyscale outflows • Absorption by the intervening IGM suppresses flux shortwards of Lyman- • The degree of suppression increases with redshift • This leads to a characteristic spectral break ...
Far-ultraviolet and far-infrared bivariate luminosity function of galaxies:
... evolution. Hence, luminosities of galaxies representative of SF activity would be ideal. As for the directly-visible SF, obviously the UV emission is appropriate for this purpose. We define the FUV luminosity of galaxies, L FUV , as L FUV ≡ ν L ν @FUV. For z = 0 galaxies, FUV corresponds to 1530 Å. ...
... evolution. Hence, luminosities of galaxies representative of SF activity would be ideal. As for the directly-visible SF, obviously the UV emission is appropriate for this purpose. We define the FUV luminosity of galaxies, L FUV , as L FUV ≡ ν L ν @FUV. For z = 0 galaxies, FUV corresponds to 1530 Å. ...
Luminosity and Mass Functions of Galaxies
... Malmquist Bias: brighter galaxies are easier to detect and are detectable at greater distances. Weight galaxies by 1/Vmax , the maximum volume over which they can be detected. Φ = Σi 1/Vmax,i Accounts for many selection effects: luminosity, redshift, etc. Agrees well with fancier methods. Not strong ...
... Malmquist Bias: brighter galaxies are easier to detect and are detectable at greater distances. Weight galaxies by 1/Vmax , the maximum volume over which they can be detected. Φ = Σi 1/Vmax,i Accounts for many selection effects: luminosity, redshift, etc. Agrees well with fancier methods. Not strong ...
Clusters as laboratories for the study of galaxy evolution
... merging, it took place at higher redshifts (z >> 1 ) than is predicted by current semianalytical models.” p.s. van Dokkum and Stanford, 2003 ApJ, 585, 78, have measured velocity “…bright endfor of the was already in dispersions 3 ofLF the bright galaxies in this cluster, which confirm the large mass ...
... merging, it took place at higher redshifts (z >> 1 ) than is predicted by current semianalytical models.” p.s. van Dokkum and Stanford, 2003 ApJ, 585, 78, have measured velocity “…bright endfor of the was already in dispersions 3 ofLF the bright galaxies in this cluster, which confirm the large mass ...
Document
... their host galaxies in less than 1Gyr?? – The universe was ~20 tedd old – Initial assembly from seed BH at z>>10 – Little or no feedback to stop BH/galaxy growth ...
... their host galaxies in less than 1Gyr?? – The universe was ~20 tedd old – Initial assembly from seed BH at z>>10 – Little or no feedback to stop BH/galaxy growth ...
Chapter 24
... consumption. Now entire galaxies become the “atoms” from which the universe is built—distant realms completely unknown to scientists just a century ago. We know of literally millions of galaxies beyond our own. Most are smaller than the Milky Way, some comparable in size, a few much larger. Many are ...
... consumption. Now entire galaxies become the “atoms” from which the universe is built—distant realms completely unknown to scientists just a century ago. We know of literally millions of galaxies beyond our own. Most are smaller than the Milky Way, some comparable in size, a few much larger. Many are ...
David AJ Seargent
... series—Weird Worlds—took a somewhat broader view insofar as recent discoveries about other planets have uncovered many features and phenomena which may certainly be regarded as “weird” or anomalous in comparison with anything experienced on Earth. The present volume continues this approach. Strange ...
... series—Weird Worlds—took a somewhat broader view insofar as recent discoveries about other planets have uncovered many features and phenomena which may certainly be regarded as “weird” or anomalous in comparison with anything experienced on Earth. The present volume continues this approach. Strange ...
Hubble Space Telescope Imaging of Post
... At HSTs resolution (∼0.0500 ) and an average redshift of hzi ∼ 0.319, an galaxy with a 500 diameter corresponds to a physical distance of about 22 kpc. It is important to note that since the PSQs were selected using an apparent magnitude cut the total luminosity given in Table 1 reflects contributio ...
... At HSTs resolution (∼0.0500 ) and an average redshift of hzi ∼ 0.319, an galaxy with a 500 diameter corresponds to a physical distance of about 22 kpc. It is important to note that since the PSQs were selected using an apparent magnitude cut the total luminosity given in Table 1 reflects contributio ...
Observable universe
The observable universe consists of the galaxies and other matter that can, in principle, be observed from Earth at the present time because light and other signals from these objects has had time to reach the Earth since the beginning of the cosmological expansion. Assuming the universe is isotropic, the distance to the edge of the observable universe is roughly the same in every direction. That is, the observable universe is a spherical volume (a ball) centered on the observer. Every location in the Universe has its own observable universe, which may or may not overlap with the one centered on Earth.The word observable used in this sense does not depend on whether modern technology actually permits detection of radiation from an object in this region (or indeed on whether there is any radiation to detect). It simply indicates that it is possible in principle for light or other signals from the object to reach an observer on Earth. In practice, we can see light only from as far back as the time of photon decoupling in the recombination epoch. That is when particles were first able to emit photons that were not quickly re-absorbed by other particles. Before then, the Universe was filled with a plasma that was opaque to photons.The surface of last scattering is the collection of points in space at the exact distance that photons from the time of photon decoupling just reach us today. These are the photons we detect today as cosmic microwave background radiation (CMBR). However, with future technology, it may be possible to observe the still older relic neutrino background, or even more distant events via gravitational waves (which also should move at the speed of light). Sometimes astrophysicists distinguish between the visible universe, which includes only signals emitted since recombination—and the observable universe, which includes signals since the beginning of the cosmological expansion (the Big Bang in traditional cosmology, the end of the inflationary epoch in modern cosmology). According to calculations, the comoving distance (current proper distance) to particles from the CMBR, which represent the radius of the visible universe, is about 14.0 billion parsecs (about 45.7 billion light years), while the comoving distance to the edge of the observable universe is about 14.3 billion parsecs (about 46.6 billion light years), about 2% larger.The best estimate of the age of the universe as of 2015 is 7010137990000000000♠13.799±0.021 billion years but due to the expansion of space humans are observing objects that were originally much closer but are now considerably farther away (as defined in terms of cosmological proper distance, which is equal to the comoving distance at the present time) than a static 13.8 billion light-years distance. It is estimated that the diameter of the observable universe is about 28 gigaparsecs (91 billion light-years, 8.8×1026 metres or 5.5×1023 miles), putting the edge of the observable universe at about 46–47 billion light-years away.