Gravitational lensing evidence against extended dark matter halos
... hidden baryonic matter might be found in galaxies, with a distribution comparable with that of luminous matter. The main goal of the present paper is to test the hypothesis that early-type lens galaxies are embedded in extended dark matter halos, as are generally found around spiral galaxies. The co ...
... hidden baryonic matter might be found in galaxies, with a distribution comparable with that of luminous matter. The main goal of the present paper is to test the hypothesis that early-type lens galaxies are embedded in extended dark matter halos, as are generally found around spiral galaxies. The co ...
GALAXY FORMATION AND EVOLUTION WITH K
... Sample size : N(m<23)= 1190, N(zphot>1.4)= 390 , 210 in 6 spectroscopic masks Ultradeep spectroscopy to B=27, I=26, 11h-30h integration ...
... Sample size : N(m<23)= 1190, N(zphot>1.4)= 390 , 210 in 6 spectroscopic masks Ultradeep spectroscopy to B=27, I=26, 11h-30h integration ...
Star Factories at the End of the World - Max-Planck
... that not even a billion years after the birth of the universe. And yet another observation that Walter and his colleagues have made in relation to quasars shortly after the Big Bang is an enigma: Although the objects are extremely young, their black hole is already similar in mass to today’s galaxie ...
... that not even a billion years after the birth of the universe. And yet another observation that Walter and his colleagues have made in relation to quasars shortly after the Big Bang is an enigma: Although the objects are extremely young, their black hole is already similar in mass to today’s galaxie ...
The Extragalactic Group of MPE and USM
... of Massive Galaxies in the FORS Deep and GOODS South fields • Study evolution of galaxies with broadband deep U to K surveys. • LFs, Mass Functions, SFRs do not require spectroscopy but can be derived with accurate photometric redshifts. • Advantage of photo z: no color selection bias, fainter lumin ...
... of Massive Galaxies in the FORS Deep and GOODS South fields • Study evolution of galaxies with broadband deep U to K surveys. • LFs, Mass Functions, SFRs do not require spectroscopy but can be derived with accurate photometric redshifts. • Advantage of photo z: no color selection bias, fainter lumin ...
sections 23-25 powerpoint
... Lenticular galaxies get their name because they are “lenslike,” but are more like spiral and barred spiral galaxies in possessing a flattened disk, rather than like elliptical galaxies which mostly possess ellipsoidal symmetry. The distinguishing feature of lenticulars is that they do not have spir ...
... Lenticular galaxies get their name because they are “lenslike,” but are more like spiral and barred spiral galaxies in possessing a flattened disk, rather than like elliptical galaxies which mostly possess ellipsoidal symmetry. The distinguishing feature of lenticulars is that they do not have spir ...
HST Frontier Fields - HubbleSOURCE
... Deep observations of the Frontier Fields will: + map out dark matter, substructure in clusters + use 100s of multiple images as probe of distance, DE + search for (lensed) SN, transients in distant universe + deep and high-spatial resolution studies of z~1-4 galaxies, (UV escape fraction, sub-kpc s ...
... Deep observations of the Frontier Fields will: + map out dark matter, substructure in clusters + use 100s of multiple images as probe of distance, DE + search for (lensed) SN, transients in distant universe + deep and high-spatial resolution studies of z~1-4 galaxies, (UV escape fraction, sub-kpc s ...
Lecture 32 Quasars
... matter onto a supermassive black hole at the center of a galaxy. These are all Active Galactic Nuclei ("AGN's") • Accretion onto compact object is a great way of producing energy, since the efficiency is so high. – hydrogen fusion in the Sun: E(out) = 0.007 Mc2 – In accretion disks: E(out) = 0.25 Mc ...
... matter onto a supermassive black hole at the center of a galaxy. These are all Active Galactic Nuclei ("AGN's") • Accretion onto compact object is a great way of producing energy, since the efficiency is so high. – hydrogen fusion in the Sun: E(out) = 0.007 Mc2 – In accretion disks: E(out) = 0.25 Mc ...
instructor notes: weeks 9/10
... Spiral galaxies are sometimes classified on the basis of the length of the spiral arms and their degree of “tightness.” However, a more universal criterion is the relative size of the central bulge, which is always largest in the Sa galaxies and smallest at Sc. van den Bergh suggested using disk to ...
... Spiral galaxies are sometimes classified on the basis of the length of the spiral arms and their degree of “tightness.” However, a more universal criterion is the relative size of the central bulge, which is always largest in the Sa galaxies and smallest at Sc. van den Bergh suggested using disk to ...
Evolution of galaxy morphology - Lecture 1 - NCRA-TIFR
... M/L defined in units of M /L For galaxies, M/L reflects the average M/L over the population Pop I (young) : massive stars dominate light; low mass stars dominate mass Pop II (old) : giants dominate light; M.S. stars dominate mass Typical galaxy (& solar neighborhood) has M/LV 6, M/LB ∼ 10 In gener ...
... M/L defined in units of M /L For galaxies, M/L reflects the average M/L over the population Pop I (young) : massive stars dominate light; low mass stars dominate mass Pop II (old) : giants dominate light; M.S. stars dominate mass Typical galaxy (& solar neighborhood) has M/LV 6, M/LB ∼ 10 In gener ...
Big Bang
... redshifts up to 95% of the speed of light have been measured!! ultraviolet wavelengths can be shifted into the visible, or infrared ...
... redshifts up to 95% of the speed of light have been measured!! ultraviolet wavelengths can be shifted into the visible, or infrared ...
The Spiral Galaxy Messier 81 - Cool Cosmos
... arms of a nearby spiral galaxy, Messier 81, are illuminated in this image from NASA's Spitzer Space Telescope. Located in the northern constellation of Ursa Major (which also includes the Big Dipper), this galaxy is easily visible through binoculars or a small telescope. Located 12 million light-yea ...
... arms of a nearby spiral galaxy, Messier 81, are illuminated in this image from NASA's Spitzer Space Telescope. Located in the northern constellation of Ursa Major (which also includes the Big Dipper), this galaxy is easily visible through binoculars or a small telescope. Located 12 million light-yea ...
What the UV SED Tells us About Stellar Populations and
... various contributors to b via case study of galaxy, I Zw 18 4. Results of case study: • The full SED is needed to make a quantitative interpretation of b • Improvements will be possible through: – New stellar evolution/spectra models – Inclusion of nebular gas & dust in model SED’s ...
... various contributors to b via case study of galaxy, I Zw 18 4. Results of case study: • The full SED is needed to make a quantitative interpretation of b • Improvements will be possible through: – New stellar evolution/spectra models – Inclusion of nebular gas & dust in model SED’s ...
The Diverse Galaxies
... The spheroidal population of stars (including the globular clusters) was formed before the galaxy collapsed into a disk and has more randomly oriented orbits. This explains the basic structure of spiral galaxies ...
... The spheroidal population of stars (including the globular clusters) was formed before the galaxy collapsed into a disk and has more randomly oriented orbits. This explains the basic structure of spiral galaxies ...
here
... covering the range 0.5< z <1.5 (large connected sky regions, all the galactic populations). • The bias function is complex! First time detection of non linearity on large scales (10% effect). • Significant evolution of the `linearized’ bias 0.7
... covering the range 0.5< z <1.5 (large connected sky regions, all the galactic populations). • The bias function is complex! First time detection of non linearity on large scales (10% effect). • Significant evolution of the `linearized’ bias 0.7
Chapter 16
... Some galaxies of our local group are difficult to observe because they are located behind the center of our Milky Way, from our view point. ...
... Some galaxies of our local group are difficult to observe because they are located behind the center of our Milky Way, from our view point. ...
ASPEN WORKSHOP 2003
... line, and even an extra, sharp feature at few hundred km/sec redshift due to infall (unlike ...
... line, and even an extra, sharp feature at few hundred km/sec redshift due to infall (unlike ...
AKARI Infrared Camera (IRC) Spectroscopy Observations: Highlights
... independent arrays; NIR, MIRS, and MIRL, which cover the 1.8–5.5um, 4.6–13.4um, and 12.6–26.5 um wavelength range, respectively. Each of the three arrays has three imaging filters, which can be switched during the observation. Each of the arrays has a wide field of view of about 10’x10’, suitable fo ...
... independent arrays; NIR, MIRS, and MIRL, which cover the 1.8–5.5um, 4.6–13.4um, and 12.6–26.5 um wavelength range, respectively. Each of the three arrays has three imaging filters, which can be switched during the observation. Each of the arrays has a wide field of view of about 10’x10’, suitable fo ...
Optical Studies of Star Formation in Normal Spiral Galaxies: Radial
... The GASP (GAlaxy Surface Photometry) package originally written by M. Cawson has recently been modified at MSSSO by S. Meatheringham to handle images up to 1352 x 1352 and to run on SUN workstations. The GASP procedure has been described elsewhere, e.g. Davis et al. (1985) and Jedrzejewski (1987). B ...
... The GASP (GAlaxy Surface Photometry) package originally written by M. Cawson has recently been modified at MSSSO by S. Meatheringham to handle images up to 1352 x 1352 and to run on SUN workstations. The GASP procedure has been described elsewhere, e.g. Davis et al. (1985) and Jedrzejewski (1987). B ...
Lifting the Dusty Veil on the Cradle of Star Birth
... HH111 shows pair of 12 ly jets blasted from system of 3 stars located near a tilted edge-on dusty torus, episodic ejections NGST will image in close to the central YSO - both SIRTF and NGST can extend sample to nearby galaxies ...
... HH111 shows pair of 12 ly jets blasted from system of 3 stars located near a tilted edge-on dusty torus, episodic ejections NGST will image in close to the central YSO - both SIRTF and NGST can extend sample to nearby galaxies ...
Galaxies, Cosmology and Dark Matter - IA
... The Galaxy was built in two phases: 1. In the beginning the gas collapsed within a few hundred million years from a large volume: → metal poor stars (and GCs) with negligible rotation → halo 2. After that a slower, dissipative phase followed: → because of its angular momentum, the gas concentrated m ...
... The Galaxy was built in two phases: 1. In the beginning the gas collapsed within a few hundred million years from a large volume: → metal poor stars (and GCs) with negligible rotation → halo 2. After that a slower, dissipative phase followed: → because of its angular momentum, the gas concentrated m ...
Chapter 17
... galaxies, and many of those are erupting in outbursts and are thus peculiar. By studying these galaxies, our attention is drawn out in space to the edge of the visible universe and back in time to the earliest stages of galaxy formation. In other words, we are led to think of the origin and evolutio ...
... galaxies, and many of those are erupting in outbursts and are thus peculiar. By studying these galaxies, our attention is drawn out in space to the edge of the visible universe and back in time to the earliest stages of galaxy formation. In other words, we are led to think of the origin and evolutio ...
Document
... • May result from a galaxy collision/merger • Gas streams converge from different directions causing shocks which compress material and trigger star formation • Gas which loses enough angular momentum falls into the galaxy center bar formation funnels more gas inward violent star formation nea ...
... • May result from a galaxy collision/merger • Gas streams converge from different directions causing shocks which compress material and trigger star formation • Gas which loses enough angular momentum falls into the galaxy center bar formation funnels more gas inward violent star formation nea ...
PDF
... class. These share the disk-like structure of spirals with an inner nuclear bulge, but are devoid of spiral arms and share the smoothness and colours of the elliptical population. Over 90% of nearby luminous galaxies can be categorized within Hubble’s scheme, described in more detail by van den Berg ...
... class. These share the disk-like structure of spirals with an inner nuclear bulge, but are devoid of spiral arms and share the smoothness and colours of the elliptical population. Over 90% of nearby luminous galaxies can be categorized within Hubble’s scheme, described in more detail by van den Berg ...
Type Ia - University of Texas Astronomy Home Page
... Stellar Physics: There are many more low mass stars born than high mass stars. High mass stars have more fuel to burn, but they burn much hotter and brighter. As a result they live a SHORTER time. A short-lived star must be massive. A long-lived star must be of relatively low mass. Galaxy Physics: ...
... Stellar Physics: There are many more low mass stars born than high mass stars. High mass stars have more fuel to burn, but they burn much hotter and brighter. As a result they live a SHORTER time. A short-lived star must be massive. A long-lived star must be of relatively low mass. Galaxy Physics: ...
Atlas of Peculiar Galaxies
The Atlas of Peculiar Galaxies is a catalog of peculiar galaxies produced by Halton Arp. A total of 338 galaxies are presented in the atlas, which was originally published in 1966 by the California Institute of Technology.The primary goal of the catalog was to present photographs of examples of the different kinds of peculiar structures found among nearby galaxies. Arp realized that the reason why galaxies formed into spiral or elliptical shapes was not well understood. He perceived peculiar galaxies as small ""experiments"" that astronomers could use to understand the physical processes that distort spiral or elliptical galaxies. With this atlas, astronomers had a sample of peculiar galaxies that they could study in more detail. The atlas does not present a complete overview of every peculiar galaxy in the sky but instead provides examples of the different phenomena as observed in nearby galaxies.Because little was known at the time of publication about the physical processes that caused the different shapes, the galaxies in the atlas are sorted based on their appearance. Objects 1–101 are individual peculiar spiral galaxies or spiral galaxies that apparently have small companions. Objects 102–145 are elliptical and elliptical-like galaxies. Individual or groups of galaxies with neither elliptical nor spiral shapes are listed as objects 146–268. Objects 269–327 are double galaxies. Finally, objects that simply do not fit into any of the above categories are listed as objects 332–338. Most objects are best known by their other designations, but a few galaxies are best known by their Arp numbers (such as Arp 220).Today, the physical processes that lead to the peculiarities seen in the Arp atlas are now well understood. A large number of the objects are interacting galaxies, including M51 (Arp 85), Arp 220, and the Antennae Galaxies (NGC 4038/NGC 4039, or Arp 244). A few of the galaxies are simply dwarf galaxies that do not have enough mass to produce enough gravity to allow the galaxies to form any cohesive structure. NGC 1569 (Arp 210) is an example of one of the dwarf galaxies in the atlas. A few other galaxies are radio galaxies. These objects contain active galactic nuclei that produce powerful jets of gas called radio jets. The atlas includes the nearby radio galaxies M87 (Arp 152) and Centaurus A (Arp 153).