Galaxy Assembly through Mergers
... another challenge, even though, given their massive nature, they may be responsible for the high mass end of the mass function. Understanding the latter in the local universe, dubbed dry mergers, constitutes the basis of this work. With the availability of large dedicated surveys such as the Sloan D ...
... another challenge, even though, given their massive nature, they may be responsible for the high mass end of the mass function. Understanding the latter in the local universe, dubbed dry mergers, constitutes the basis of this work. With the availability of large dedicated surveys such as the Sloan D ...
Niraj D. Welikala Thesis - D-Scholarship@Pitt
... dark matter halos and just like the dark matter halos, undergo hierarchical merging, with smaller galaxies merging to become larger ones. In this picture, the clusters of galaxies we see today, such as the Coma cluster, shown in the top left panel of Figure 1.2 must have been assembled from this mas ...
... dark matter halos and just like the dark matter halos, undergo hierarchical merging, with smaller galaxies merging to become larger ones. In this picture, the clusters of galaxies we see today, such as the Coma cluster, shown in the top left panel of Figure 1.2 must have been assembled from this mas ...
physics with electronic - Yaba College of Technology
... the need to introduce the semester credit units which will enable a student who so wish to transfer the units already completed in an institution of similar standard from which he is transferring. In designing the units, the principle of the modular system by product has been adopted, thus making ea ...
... the need to introduce the semester credit units which will enable a student who so wish to transfer the units already completed in an institution of similar standard from which he is transferring. In designing the units, the principle of the modular system by product has been adopted, thus making ea ...
ROSAT Ian R. Stevens* and David K. Strickland*
... l4686. Of these only one, Mrk 49, a blue compact dwarf galaxy (also classified as Mrk 1318), has been observed. However, there seems to be emission from a point source near to but not coincident with Mrk 49 (the X-ray emission is centred about 45 arcsec away from the centre of Mrk 49 – too large to ...
... l4686. Of these only one, Mrk 49, a blue compact dwarf galaxy (also classified as Mrk 1318), has been observed. However, there seems to be emission from a point source near to but not coincident with Mrk 49 (the X-ray emission is centred about 45 arcsec away from the centre of Mrk 49 – too large to ...
The most metal-poor galaxies
... of spiral galaxies. At the time of this discovery the general wisdom that most galaxies (in particular the ellipticals) had been formed over a short period during a dynamical free fall time of few 107 years (Eggen et al. 1962) started to be challenged (e.g. Searle and Zinn 1978). It is also during t ...
... of spiral galaxies. At the time of this discovery the general wisdom that most galaxies (in particular the ellipticals) had been formed over a short period during a dynamical free fall time of few 107 years (Eggen et al. 1962) started to be challenged (e.g. Searle and Zinn 1978). It is also during t ...
environmental effects on galaxy evolution in nearby clusters
... The environmental effects on galaxy evolution in nearby clusters are investigated using a multiwavelength dataset. The present analysis is focused on the properties of three (Abell 1367, Virgo and Coma) among the best studied clusters in the local Universe. Due to the variety of their environmental ...
... The environmental effects on galaxy evolution in nearby clusters are investigated using a multiwavelength dataset. The present analysis is focused on the properties of three (Abell 1367, Virgo and Coma) among the best studied clusters in the local Universe. Due to the variety of their environmental ...
The correlation between galaxy morphology and star
... et al. 2010; Cassata et al. 2010). The number density of these galaxies rapidly increases, by a factor of five, from z ∼ 2 to z ∼ 1, and they are up to 5 times more compact in size than local ones with similar mass (Cassata et al. 2011, 2013). Recent works have suggested, however, that a large fract ...
... et al. 2010; Cassata et al. 2010). The number density of these galaxies rapidly increases, by a factor of five, from z ∼ 2 to z ∼ 1, and they are up to 5 times more compact in size than local ones with similar mass (Cassata et al. 2011, 2013). Recent works have suggested, however, that a large fract ...
The VIMOS Ultra-Deep Survey (VUDS): Fast Increase in the Fraction
... Deharveng et al. 2008; Hayes et al. 2014). As a result of their nature, Lyα photons are found to be scattered at much larger scales than UV photons (Steidel et al. 2011; Momose et al. 2014). Predicting the escape fraction of the Lyα photons as a function of the galaxy properties involves including a ...
... Deharveng et al. 2008; Hayes et al. 2014). As a result of their nature, Lyα photons are found to be scattered at much larger scales than UV photons (Steidel et al. 2011; Momose et al. 2014). Predicting the escape fraction of the Lyα photons as a function of the galaxy properties involves including a ...
Galaxy Formation and Evolution.
... The rapidly expanding field of galaxy formation lies at the interfaces of astronomy, particle physics, and cosmology. Covering diverse topics from these disciplines, all of which are needed to understand how galaxies form and evolve, this book is ideal for researchers entering the field. Individual ...
... The rapidly expanding field of galaxy formation lies at the interfaces of astronomy, particle physics, and cosmology. Covering diverse topics from these disciplines, all of which are needed to understand how galaxies form and evolve, this book is ideal for researchers entering the field. Individual ...
Preliminary Talk Abstract Book - MoCA
... Galactic winds are necessary to reduce the star formation rate in simulated galaxies to match observations. However, these outflows can be so violent that they completely destroy the gas disc. Maintaining a gas disc for a sufficiently long time in order to form a stellar disc thus becomes difficult. ...
... Galactic winds are necessary to reduce the star formation rate in simulated galaxies to match observations. However, these outflows can be so violent that they completely destroy the gas disc. Maintaining a gas disc for a sufficiently long time in order to form a stellar disc thus becomes difficult. ...
Elliptical Galaxies
... have a short axis about 65% of the length of the long axis with a dispersion of about 15%. This picture remained current until the late 1970s but has been dramatically revised since then. In recent years attempts to produce a physical classification for ellipticals, and new ways of estimating their ...
... have a short axis about 65% of the length of the long axis with a dispersion of about 15%. This picture remained current until the late 1970s but has been dramatically revised since then. In recent years attempts to produce a physical classification for ellipticals, and new ways of estimating their ...
Observational evidence for AGN feedback in early
... and assemble the last, contrary to what has been deduced from observations. For a critical example, these models struggle to match the observed chemical abundance ratios and their trends with galaxy mass (Thomas 1999; Nagashima et al. 2005). The reason for this failure in the early models is that SF ...
... and assemble the last, contrary to what has been deduced from observations. For a critical example, these models struggle to match the observed chemical abundance ratios and their trends with galaxy mass (Thomas 1999; Nagashima et al. 2005). The reason for this failure in the early models is that SF ...
Worlds Beyond The Poles
... His perception’s view extended a million miles and more beyond the mathematical boundaries of a fallaciously assumed “isolated globe” Earth. It penetrated through the sublime celestial domain, where deceptive lights, like flashing eyes of artful courtesans, had for untold centuries beckoned and woo ...
... His perception’s view extended a million miles and more beyond the mathematical boundaries of a fallaciously assumed “isolated globe” Earth. It penetrated through the sublime celestial domain, where deceptive lights, like flashing eyes of artful courtesans, had for untold centuries beckoned and woo ...
THE STAR FORMATION AND NUCLEAR ACCRETION HISTORIES OF NORMAL GALAXIES
... Given their similar evolution, spectral shapes (e.g., Ptak et al. 1999), and potentially similar luminosities, it may be difficult to disentangle the X-ray emission from AGNs and star formation at z < ∼ 1. Probing the X-ray evolution of normal galaxies between z ' 0.1 and z ' 1 is also difficult bec ...
... Given their similar evolution, spectral shapes (e.g., Ptak et al. 1999), and potentially similar luminosities, it may be difficult to disentangle the X-ray emission from AGNs and star formation at z < ∼ 1. Probing the X-ray evolution of normal galaxies between z ' 0.1 and z ' 1 is also difficult bec ...
Modeling Spatially and Spectrally Resolved Observations to
... of stellar evolutionary processes and merge into supermassive black holes (SMBH) at the centers of, so far as we know, every massive galaxy. However, the universe did not begin in such a heterogeneous fashion. Instead, 13.8 billion years ago, the distribution of matter was nearly perfectly uniform, ...
... of stellar evolutionary processes and merge into supermassive black holes (SMBH) at the centers of, so far as we know, every massive galaxy. However, the universe did not begin in such a heterogeneous fashion. Instead, 13.8 billion years ago, the distribution of matter was nearly perfectly uniform, ...
Article PDF - IOPscience
... and broadband colors with the clumpiness parameter S, the uniquely large asymmetries of 66 galaxies undergoing mergers, and the correlation of bulge to total light ratios, and stellar masses, with the concentration index. As an obvious goal is to use this system at high redshifts to trace evolution, ...
... and broadband colors with the clumpiness parameter S, the uniquely large asymmetries of 66 galaxies undergoing mergers, and the correlation of bulge to total light ratios, and stellar masses, with the concentration index. As an obvious goal is to use this system at high redshifts to trace evolution, ...
The Day We Found the Universe
... He goes to the world's largest and best-equipped telescope and, voilà, he reveals a cosmos populated with myriad galaxies spread over space as far as the telescopic eye could see. The Milky Way suddenly becomes a minor player ...
... He goes to the world's largest and best-equipped telescope and, voilà, he reveals a cosmos populated with myriad galaxies spread over space as far as the telescopic eye could see. The Milky Way suddenly becomes a minor player ...
Lecture 2
... spacially resolved kinematic structure of most of the gas…which resides in the cold phase” (Carilli & Blain ...
... spacially resolved kinematic structure of most of the gas…which resides in the cold phase” (Carilli & Blain ...
SPICA Yellow Book
... A complete understanding of the formation and evolution of galaxies, stars and planets can only be reached through the investigation of the cold and obscured parts of the Universe, where the basic processes of formation and evolution occur. Deep exploration of the cold Universe using high spatial re ...
... A complete understanding of the formation and evolution of galaxies, stars and planets can only be reached through the investigation of the cold and obscured parts of the Universe, where the basic processes of formation and evolution occur. Deep exploration of the cold Universe using high spatial re ...
Hubble 2006: Science Year in Review
... The final servicing mission in 2008 will install two new instruments, the Cosmic Origins Spectrograph (COS) and Wide Field Camera 3 (WFC3). COS is the most sensitive ultraviolet spectrograph ever built for Hubble. The instrument will probe the cosmic web—the large-scale structure of the universe—who ...
... The final servicing mission in 2008 will install two new instruments, the Cosmic Origins Spectrograph (COS) and Wide Field Camera 3 (WFC3). COS is the most sensitive ultraviolet spectrograph ever built for Hubble. The instrument will probe the cosmic web—the large-scale structure of the universe—who ...
Mapping the Pathways of Galaxy Transformation Across Time and
... that accelerate evolution. They led to a paradigm in which the decline in activity of SF galaxies since z∼2; the removal of systems from that population; and the correlations between environment, SFR, and morphology all reflect the same underlying phenomenon: the initial configuration of the matter ...
... that accelerate evolution. They led to a paradigm in which the decline in activity of SF galaxies since z∼2; the removal of systems from that population; and the correlations between environment, SFR, and morphology all reflect the same underlying phenomenon: the initial configuration of the matter ...
Clusters as laboratories for the study of galaxy evolution
... “Clusters…are laboratories for the study of galaxy evolution and may become as useful as star clusters are in the study of stellar evolution” -- Dressler, 1984 Annual Reviews Back in 1984, (and still?) the prevalent view was that clusters were themselves agents that influenced the evolution of gala ...
... “Clusters…are laboratories for the study of galaxy evolution and may become as useful as star clusters are in the study of stellar evolution” -- Dressler, 1984 Annual Reviews Back in 1984, (and still?) the prevalent view was that clusters were themselves agents that influenced the evolution of gala ...
Galaxies - hwchemistry
... • To hold stars in such small, short-period orbits, the centers of galaxies must contain masses of a million to a few billion solar masses. • Yet, no object is visible. – The evidence seems to require that the nuclei of galaxies contain supermassive black holes. – You have learned that Milky Way con ...
... • To hold stars in such small, short-period orbits, the centers of galaxies must contain masses of a million to a few billion solar masses. • Yet, no object is visible. – The evidence seems to require that the nuclei of galaxies contain supermassive black holes. – You have learned that Milky Way con ...
The visibility of Lyman Alpha Emitters: constraining reionization
... This work is quite close in spirit to the calculations presented in Dayal et al. (2011) wherein the authors used (a) cosmological hydrodynamic simulations run with GADGET-2 to obtain the physical properties of z ≃ 5.7 galaxies, (b) a dust model that took into account the entire star formation histor ...
... This work is quite close in spirit to the calculations presented in Dayal et al. (2011) wherein the authors used (a) cosmological hydrodynamic simulations run with GADGET-2 to obtain the physical properties of z ≃ 5.7 galaxies, (b) a dust model that took into account the entire star formation histor ...
Non-standard cosmology
A non-standard cosmology is any physical cosmological model of the universe that has been, or still is, proposed as an alternative to the Big Bang model of standard physical cosmology. In the history of cosmology, various scientists and researchers have disputed parts or all of the Big Bang due to a rejection or addition of fundamental assumptions needed to develop a theoretical model of the universe. From the 1940s to the 1960s, the astrophysical community was equally divided between supporters of the Big Bang theory and supporters of a rival steady state universe. It was not until advances in observational cosmology in the late 1960s that the Big Bang would eventually become the dominant theory, and today there are few active researchers who dispute it.The term non-standard is applied to any cosmological theory that does not conform to the scientific consensus, but is not used in describing alternative models where no consensus has been reached, and is also used to describe theories that accept a ""big bang"" occurred but differ as to the detailed physics of the origin and evolution of the universe. Because the term depends on the prevailing consensus, the meaning of the term changes over time. For example, hot dark matter would not have been considered non-standard in 1990, but would be in 2010. Conversely, a non-zero cosmological constant resulting in an accelerating universe would have been considered non-standard in 1990, but is part of the standard cosmology in 2010.