Populations of Galaxies and their Formation at z < 7
... integrated stellar mass in the universe increases gradually throughout this time suggesting that galaxy formation does not happen all at once. 3. Galaxies at high redshifts are peculiar and are likely undergoing mergers. The transition from mergers to normal Hubble types occurs at about z~1.5. Calcu ...
... integrated stellar mass in the universe increases gradually throughout this time suggesting that galaxy formation does not happen all at once. 3. Galaxies at high redshifts are peculiar and are likely undergoing mergers. The transition from mergers to normal Hubble types occurs at about z~1.5. Calcu ...
Summary of Talks at Growing Black Holes 2004 in Garching
... Also running another survey with SCUBA , find overdensity of sources in the z>6 fields. Are they at the same redshift? Follow up with deep VLA map shows one object to be a FRII source, one that may be associated with a galaxy, and possibly the quasar itself. Summary: They don’t see an excess of ...
... Also running another survey with SCUBA , find overdensity of sources in the z>6 fields. Are they at the same redshift? Follow up with deep VLA map shows one object to be a FRII source, one that may be associated with a galaxy, and possibly the quasar itself. Summary: They don’t see an excess of ...
ray emission from the distant BL Lac PG 1553+113
... object detected at VHE energies. Therefore, the observed VHE spectrum is expected to be affected by EBL absorption. Unfortunately the unknown redshift of this object does not allow its VHE spectrum to be used in constraining the poorly-measured EBL flux density (see e.g. Aharonian et al. 2005d). Howe ...
... object detected at VHE energies. Therefore, the observed VHE spectrum is expected to be affected by EBL absorption. Unfortunately the unknown redshift of this object does not allow its VHE spectrum to be used in constraining the poorly-measured EBL flux density (see e.g. Aharonian et al. 2005d). Howe ...
Galactic Evolution - Harvard-Smithsonian Center for Astrophysics
... however, could not account for the rapid assembly of such huge systems; even aided by the gravity, chance alone cannot collect ~1068 atoms to form even a single galaxy in the entire age of the Universe, and accelerants in the earlier Universe could not then be discerned to enhance the origin of gala ...
... however, could not account for the rapid assembly of such huge systems; even aided by the gravity, chance alone cannot collect ~1068 atoms to form even a single galaxy in the entire age of the Universe, and accelerants in the earlier Universe could not then be discerned to enhance the origin of gala ...
BBO
... using those same ~1000 galaxies to create a new synthetic data set, giving the “calibration” binaries random orientations and coalescence times. Analyze the data 2 different ways: with and without the benefit of the exact sky location. The difference is an estimate of the systematic bias. 2) Include ...
... using those same ~1000 galaxies to create a new synthetic data set, giving the “calibration” binaries random orientations and coalescence times. Analyze the data 2 different ways: with and without the benefit of the exact sky location. The difference is an estimate of the systematic bias. 2) Include ...
Chapter 15 Stars, Galaxies, and Universe
... The bright star Deneb is about 3,230 light-years from Earth. To express this number in scientific notation, first insert a decimal point in the original number so that you have a number between one and ten. In this case, the number is 3.23. To determine the power of 10, count the number of places th ...
... The bright star Deneb is about 3,230 light-years from Earth. To express this number in scientific notation, first insert a decimal point in the original number so that you have a number between one and ten. In this case, the number is 3.23. To determine the power of 10, count the number of places th ...
XLII RENCONTRES DE MORIOND WORKSHOP ON …
... To produce an anti-Malmquist bias in the simulations we employ an OA LF that evolves with z. GRBs OA optical brightness must be evolving with z? Are the high-z ...
... To produce an anti-Malmquist bias in the simulations we employ an OA LF that evolves with z. GRBs OA optical brightness must be evolving with z? Are the high-z ...
The Animate and the Inanimate
... it might be concluded that all physical laws must in consequence be reversible, and that, therefore, there can be no essential difference between the real universe and the reverse universe. And this much is true, that, provided we examine the motions of the particles of matter, everything that happe ...
... it might be concluded that all physical laws must in consequence be reversible, and that, therefore, there can be no essential difference between the real universe and the reverse universe. And this much is true, that, provided we examine the motions of the particles of matter, everything that happe ...
... • Galaxies and other objects may have motions that have nothing to do with the expansion of space • When galaxies orbit each other, sometimes their orbital speed is much larger than the redshift caused by expansion. • We cannot use Hubble’s law for nearby galaxies, and certainly not for any objects ...
The Animate and the Inanimate
... But at the same time, if we take the most ordinary events of the real universe and attempt to find out what is the corresponding event in the reverse universe, something strange will at once impress us about the reverse universe. Take this, for example: a ball rolls down a staircase, bounces a littl ...
... But at the same time, if we take the most ordinary events of the real universe and attempt to find out what is the corresponding event in the reverse universe, something strange will at once impress us about the reverse universe. Take this, for example: a ball rolls down a staircase, bounces a littl ...
Light on Dark Matter with Weak Gravitational Lensing
... Abstract— This paper reviews statistical methods recently developed to reconstruct and analyze dark matter mass maps from weak lensing observations. The field of weak lensing is motivated by the observations made in the last decades showing that the visible matter represents only about 4-5% of the U ...
... Abstract— This paper reviews statistical methods recently developed to reconstruct and analyze dark matter mass maps from weak lensing observations. The field of weak lensing is motivated by the observations made in the last decades showing that the visible matter represents only about 4-5% of the U ...
AGN surveys to study galaxy evolution along cosmic times
... “The observed line intensities [....] in NGC1068 and 4151 closely resemble the line intensities of the planetary nebula NGC7027” and “The hydrogen lines in NGC4151 and 7469 are of unusual interest, being composed of relatively narrow cores (1100 km/sec wide) superposed on very wide wings (7500 km/se ...
... “The observed line intensities [....] in NGC1068 and 4151 closely resemble the line intensities of the planetary nebula NGC7027” and “The hydrogen lines in NGC4151 and 7469 are of unusual interest, being composed of relatively narrow cores (1100 km/sec wide) superposed on very wide wings (7500 km/se ...
Galaxy Notes File
... Rather than occurring individually in space, galaxies are grouped in clusters ranging in size from a few dozens to thousands of galaxies. The Coma Cluster, shown at right, is 300 million light years from the Milky Way and contains more than 1,000 (and possibly as many as 10,000) galaxies. The Milky ...
... Rather than occurring individually in space, galaxies are grouped in clusters ranging in size from a few dozens to thousands of galaxies. The Coma Cluster, shown at right, is 300 million light years from the Milky Way and contains more than 1,000 (and possibly as many as 10,000) galaxies. The Milky ...
physics for beginners - The Nature of Things
... technology that drives our society has been driven in turn by fundamental discoveries of physics. But, just what is physics? It derives its present name from the Greek word for nature; it was previously called natural philosophy. Physics can be defined as the science that deals with matter, energy, ...
... technology that drives our society has been driven in turn by fundamental discoveries of physics. But, just what is physics? It derives its present name from the Greek word for nature; it was previously called natural philosophy. Physics can be defined as the science that deals with matter, energy, ...
The Formation and Evolution of Massive Black Holes - Ira-Inaf
... massive star is to collapse into a black hole with a mass similar to that of its progenitor. However, this is not the case when the content of heavy elements increases. In today’s universe, a very massive star would lose most of its mass in powerful winds before collapsing into a stellar mass black ...
... massive star is to collapse into a black hole with a mass similar to that of its progenitor. However, this is not the case when the content of heavy elements increases. In today’s universe, a very massive star would lose most of its mass in powerful winds before collapsing into a stellar mass black ...
1. The "Q" word and its meaning
... Q1: Quenching and the cessation of star-formation 1. The "Q" word and its meaning a. Is quenching a good word to describe the end of star-formation in galaxies ? b. What are the timescale(s) for quenching? Pablo , Jarle c. Is quenching due to starvation or gas expulsion? Romeel 2. What do we learn f ...
... Q1: Quenching and the cessation of star-formation 1. The "Q" word and its meaning a. Is quenching a good word to describe the end of star-formation in galaxies ? b. What are the timescale(s) for quenching? Pablo , Jarle c. Is quenching due to starvation or gas expulsion? Romeel 2. What do we learn f ...
Inflation
... • Big bang nucleosythesis (BBN) at t ∼ 102 s. As the temperature drops below MeV isotopes of light nuclei (hydrogen, helium, lithium,...) are formed from protons and neutrons. Theoretical predictions and observations are in excellent agreement about the primordial abundances (75% hydrogen, 25% heli ...
... • Big bang nucleosythesis (BBN) at t ∼ 102 s. As the temperature drops below MeV isotopes of light nuclei (hydrogen, helium, lithium,...) are formed from protons and neutrons. Theoretical predictions and observations are in excellent agreement about the primordial abundances (75% hydrogen, 25% heli ...
A Project Underway to Build an Inexpensive 8-Meter Telescope
... 10-20 parameters. By finding the covariance of luminosity in a single bin with this parameter set we should be able to reduce the scatter significantly by producing a detailed luminosity model, or at least discard outriggers. ...
... 10-20 parameters. By finding the covariance of luminosity in a single bin with this parameter set we should be able to reduce the scatter significantly by producing a detailed luminosity model, or at least discard outriggers. ...
1Cmoles.pdf
... spectroscopic surveys cannot go as deep as the photometric surveys, reaching only I ≈ 24 with the use of large telescopes. The covered fields are necessarily small and cannot cope with the complex variety of objects in the Universe. To get the optimum compromise between large area and depth, good sp ...
... spectroscopic surveys cannot go as deep as the photometric surveys, reaching only I ≈ 24 with the use of large telescopes. The covered fields are necessarily small and cannot cope with the complex variety of objects in the Universe. To get the optimum compromise between large area and depth, good sp ...
Exploring the Most Bizarre Ideas in Cosmology Astronomers
... simply fails to deliver the goods; fails to give a satisfactory account of observed phenomena. Yet, at other times a theory looks good but simply does not jell with the general line of thinking at the time. Sometimes, theories of this type eventually have their day in the Sun as evidence in their fa ...
... simply fails to deliver the goods; fails to give a satisfactory account of observed phenomena. Yet, at other times a theory looks good but simply does not jell with the general line of thinking at the time. Sometimes, theories of this type eventually have their day in the Sun as evidence in their fa ...
View the pdf here
... Poe’s mind was by no means commonplace. In the last year of his life he wrote a prose poem, Eureka, which would have established this fact beyond doubt—if it had not been so full of intuitive insight that neither his contemporaries nor subsequent generations, at least until the late twentieth centur ...
... Poe’s mind was by no means commonplace. In the last year of his life he wrote a prose poem, Eureka, which would have established this fact beyond doubt—if it had not been so full of intuitive insight that neither his contemporaries nor subsequent generations, at least until the late twentieth centur ...
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.