An Expanded View of the Universe
... the Universe? Black holes have puzzled physicists and astronomers since they were first postulated in relativistic form a century ago by Karl Schwarzschild. Observations have demonstrated that these bizarre objects really exist. And on a grand scale, too: not only have black holes been found with ma ...
... the Universe? Black holes have puzzled physicists and astronomers since they were first postulated in relativistic form a century ago by Karl Schwarzschild. Observations have demonstrated that these bizarre objects really exist. And on a grand scale, too: not only have black holes been found with ma ...
THE STAR FORMATION AND NUCLEAR ACCRETION HISTORIES OF NORMAL GALAXIES
... effective exposure times that are large enough to detect galaxies at intermediate redshift (Msec). In Section 2 we describe the data and illustrate our ability to detect X-ray emission from the AGES galaxies through the stacking approach. In Section 3 we provide further details of our stacking analy ...
... effective exposure times that are large enough to detect galaxies at intermediate redshift (Msec). In Section 2 we describe the data and illustrate our ability to detect X-ray emission from the AGES galaxies through the stacking approach. In Section 3 we provide further details of our stacking analy ...
Galaxies - WordPress.com
... as our galaxy ages over the next few billion years it will A not change at all B get smaller and become an elliptical galaxy C get fainter till it fades from view ...
... as our galaxy ages over the next few billion years it will A not change at all B get smaller and become an elliptical galaxy C get fainter till it fades from view ...
Elliptical Galaxies
... mixture of oblate and prolate figures. The discovery that elliptical galaxies are not flattened by their rotation has important implications for our ideas about how they form. Models where isolated massive clouds of gas collapse dissipationally and form stars rapidly always produce galaxies which ro ...
... mixture of oblate and prolate figures. The discovery that elliptical galaxies are not flattened by their rotation has important implications for our ideas about how they form. Models where isolated massive clouds of gas collapse dissipationally and form stars rapidly always produce galaxies which ro ...
Gravitational Bending of Light and Its Measurement with
... with diameter of up to several 1000 kilometers. The SKA is a new generation radio telescope that will be 100 times as sensitive as the best present-day instruments. It will unlock information from the very early Universe and, using novel capabilities, be able to undertake entirely new classes of obs ...
... with diameter of up to several 1000 kilometers. The SKA is a new generation radio telescope that will be 100 times as sensitive as the best present-day instruments. It will unlock information from the very early Universe and, using novel capabilities, be able to undertake entirely new classes of obs ...
Clustering of far-infrared galaxies in the AKARI All-Sky Survey North
... The FIS scanned 96% of the entire sky more than twice in the 16 months of the cryogenic mission phase. In March 2010, the AKARI/FIS Bright Source Catalogue v.1.0 was released to the scientific community. It contains, in total, 427071 point sources measured at 65, 90, 140, 160 µm. Hereafter, we use t ...
... The FIS scanned 96% of the entire sky more than twice in the 16 months of the cryogenic mission phase. In March 2010, the AKARI/FIS Bright Source Catalogue v.1.0 was released to the scientific community. It contains, in total, 427071 point sources measured at 65, 90, 140, 160 µm. Hereafter, we use t ...
IXO as an observatory in the large telescopes era
... has discovered a population of deeply "buried" AGN with very small fractions of scattered lights indicating a geometrically thick torus around the SMBH (Ueda et al. 2007). This implies that many similar objects, if observed in edge-on geometry, could be missed in the current hard X-ray surveys due t ...
... has discovered a population of deeply "buried" AGN with very small fractions of scattered lights indicating a geometrically thick torus around the SMBH (Ueda et al. 2007). This implies that many similar objects, if observed in edge-on geometry, could be missed in the current hard X-ray surveys due t ...
A Zoo of Galaxies - Cambridge University Press
... to build the telescope, was to resolve structure in distant nebula to see if they could be “island universe”, rather similar in structure to our own galactic home. Today we have images of millions of galaxies from large surveys like the Sloan Digital Sky Survey (e.g. the last imaging release in Data ...
... to build the telescope, was to resolve structure in distant nebula to see if they could be “island universe”, rather similar in structure to our own galactic home. Today we have images of millions of galaxies from large surveys like the Sloan Digital Sky Survey (e.g. the last imaging release in Data ...
Science with the Constellation
... Since their discovery, quasars and active galactic nuclei (AGN) have stood out as uniquely luminous objects in the Universe. Today we are confident that their ultimate power source is the release of gravitational energy sustained by an accretion disk, which is feeding matter directly into a central ...
... Since their discovery, quasars and active galactic nuclei (AGN) have stood out as uniquely luminous objects in the Universe. Today we are confident that their ultimate power source is the release of gravitational energy sustained by an accretion disk, which is feeding matter directly into a central ...
1 The Hubble Story (10:56)
... Cepheid’s period of variation depends on physical properties of the star such as mass and true brightness. This means that astronomers, just by looking at the variability of their light, can effectively determine their distance. For this reason, cosmologists ...
... Cepheid’s period of variation depends on physical properties of the star such as mass and true brightness. This means that astronomers, just by looking at the variability of their light, can effectively determine their distance. For this reason, cosmologists ...
Local Group Encyclopedia of Astronomy & Astrophysics eaa.iop.org Mario L Mateo
... Galaxy. Various indirect indicators suggest that our Galaxy can be classified as an Sbc galaxy, intermediate between the properties described for M31 and M33. Some recent studies at radio, infrared and optical wavelengths also suggest that our Galaxy contains an elongated central bar composed of old ...
... Galaxy. Various indirect indicators suggest that our Galaxy can be classified as an Sbc galaxy, intermediate between the properties described for M31 and M33. Some recent studies at radio, infrared and optical wavelengths also suggest that our Galaxy contains an elongated central bar composed of old ...
A Zoo of Galaxies
... to build the telescope, was to resolve structure in distant nebula to see if they could be “island universe”, rather similar in structure to our own galactic home. Today we have images of millions of galaxies from large surveys like the Sloan Digital Sky Survey (e.g. the last imaging release in Data ...
... to build the telescope, was to resolve structure in distant nebula to see if they could be “island universe”, rather similar in structure to our own galactic home. Today we have images of millions of galaxies from large surveys like the Sloan Digital Sky Survey (e.g. the last imaging release in Data ...
A Zoo of Galaxies - Portsmouth Research Portal
... to build the telescope, was to resolve structure in distant nebula to see if they could be “island universe”, rather similar in structure to our own galactic home. Today we have images of millions of galaxies from large surveys like the Sloan Digital Sky Survey (e.g. the last imaging release in Data ...
... to build the telescope, was to resolve structure in distant nebula to see if they could be “island universe”, rather similar in structure to our own galactic home. Today we have images of millions of galaxies from large surveys like the Sloan Digital Sky Survey (e.g. the last imaging release in Data ...
Introduction
... fraction of quenched late-type galaxies are, however, not gas deficient, and form a more heterogeneous class of objects with probably more complex evolutionary histories. In contrast to the case of star formation, the chemical evolution of star-forming galaxies, as traced by the stellar mass-metalli ...
... fraction of quenched late-type galaxies are, however, not gas deficient, and form a more heterogeneous class of objects with probably more complex evolutionary histories. In contrast to the case of star formation, the chemical evolution of star-forming galaxies, as traced by the stellar mass-metalli ...
Article PDF - IOPscience
... nature of their power source. Specifically, most galaxies which possess a radio-luminous active galactic nucleus (AGN) and rapidly advancing jets show little evidence for a central accreting disk. For example, in Centaurus A and Virgo A (M87) there is no blue continuum or broad emission lines, but a ...
... nature of their power source. Specifically, most galaxies which possess a radio-luminous active galactic nucleus (AGN) and rapidly advancing jets show little evidence for a central accreting disk. For example, in Centaurus A and Virgo A (M87) there is no blue continuum or broad emission lines, but a ...
Lecture 2
... star formation history and dust extinction. • But z=3 LBGs do not present a complete picture of the universe at this redshift. Current Topics: Lyman Break Galaxies - Lecture 2 ...
... star formation history and dust extinction. • But z=3 LBGs do not present a complete picture of the universe at this redshift. Current Topics: Lyman Break Galaxies - Lecture 2 ...
Joint formation of QSOs and spheroids: QSOs as clocks of star
... relationship between the formation of QSOs and their spheroid hosts, with particular emphasis on the timing of star formation in the hosts and the QSO shining. We derive the formation rate of the spheroids from the formation rate of the QSOs (Sections 2.1 and 2.2), taking into account the observatio ...
... relationship between the formation of QSOs and their spheroid hosts, with particular emphasis on the timing of star formation in the hosts and the QSO shining. We derive the formation rate of the spheroids from the formation rate of the QSOs (Sections 2.1 and 2.2), taking into account the observatio ...
THE SPATIALLY RESOLVED [Cii] COOLING LINE DEFICIT IN
... parameterization of the strongly varying local heating conditions in the ISM, which must underly the deficit, perhaps due to strong correlation between merger activity and high infrared luminosity. But this is emphatically not the case at earlier epochs, where wide ranges of ISM conditions exist even ...
... parameterization of the strongly varying local heating conditions in the ISM, which must underly the deficit, perhaps due to strong correlation between merger activity and high infrared luminosity. But this is emphatically not the case at earlier epochs, where wide ranges of ISM conditions exist even ...
THE INFLUENCE OF ENVIRONMENTAL EFFECTS ON GALAXY
... is necessary to suppose that the gas is stirred up by supernova explosions or galaxy mergers. Some such process must in any case be at work in order to extract angular momentum from the infalling gas thus preventing it from forming a disc. Another factor that needs to be considered is the variation ...
... is necessary to suppose that the gas is stirred up by supernova explosions or galaxy mergers. Some such process must in any case be at work in order to extract angular momentum from the infalling gas thus preventing it from forming a disc. Another factor that needs to be considered is the variation ...
Lab 14 Galaxy Morphology
... appeared similar to comets, but did not move. Others of these nebulae were resolved into clusters of stars as bigger telescopes were constructed, and used to examine them. Some of these fuzzy nebulae, however, did not break-up into stars no matter how big a telescope was used to look at them. While ...
... appeared similar to comets, but did not move. Others of these nebulae were resolved into clusters of stars as bigger telescopes were constructed, and used to examine them. Some of these fuzzy nebulae, however, did not break-up into stars no matter how big a telescope was used to look at them. While ...
Jul y 9- 11,
... University of Washington We present results from a deep XMM-Newton survey of M33 consisting of 8 pointings extending beyond the D25 isophote sensitive to L(0.2-4.5 keV) ¡ 4 1034 erg/s. The large area coupled with the XMM soft response complement the deep Chandra Survey of M33. Cross-correlation of ...
... University of Washington We present results from a deep XMM-Newton survey of M33 consisting of 8 pointings extending beyond the D25 isophote sensitive to L(0.2-4.5 keV) ¡ 4 1034 erg/s. The large area coupled with the XMM soft response complement the deep Chandra Survey of M33. Cross-correlation of ...
– 1 – 1. Galaxy Observations 1.1.
... rate affecting the UV continuum, and the calibration for UV stellar photospheric features or UV ISM absorption to metallicity is not well understood at present (see Erb 2010 for details). So the best approach is to move into the near-IR, where the normal optical low redshift techniques and calibrati ...
... rate affecting the UV continuum, and the calibration for UV stellar photospheric features or UV ISM absorption to metallicity is not well understood at present (see Erb 2010 for details). So the best approach is to move into the near-IR, where the normal optical low redshift techniques and calibrati ...
Probing Dark Energy with Lensing Magnification in Photometric
... yielding increases in the apparant number density. Most detections of lensing magnification to-date have measured the angular cross-correlation function of two source samples widely separated in redshift [9–11] (although see a novel method in Ref. [12]). In the absence of lensing, such a correlation ...
... yielding increases in the apparant number density. Most detections of lensing magnification to-date have measured the angular cross-correlation function of two source samples widely separated in redshift [9–11] (although see a novel method in Ref. [12]). In the absence of lensing, such a correlation ...
Galaxy properties
... 1010 L . The absolute luminosity of the Sun is ∼ 5.48, which implies the absolute luminosity of Milky Way being ∼ −20.3. Our neighbouring Andromeda Galaxy, M31, is somewhat more luminous (−20.8), while the Magellanic Clouds have luminosities ∼ −18 and ∼ −16.5. Luminosities of massive elliptical gal ...
... 1010 L . The absolute luminosity of the Sun is ∼ 5.48, which implies the absolute luminosity of Milky Way being ∼ −20.3. Our neighbouring Andromeda Galaxy, M31, is somewhat more luminous (−20.8), while the Magellanic Clouds have luminosities ∼ −18 and ∼ −16.5. Luminosities of massive elliptical gal ...
Measuring distances to the edge of the local group
... Scientific Justification Be sure to include overall significance to astronomy. For standard proposals limit text to one page with figures, captions and references on no more than two additional pages. We propose to measure the distance to the nearby dwarf irregular galaxies Sextans A, B, and NGC 310 ...
... Scientific Justification Be sure to include overall significance to astronomy. For standard proposals limit text to one page with figures, captions and references on no more than two additional pages. We propose to measure the distance to the nearby dwarf irregular galaxies Sextans A, B, and NGC 310 ...
Quasar
Quasars (/ˈkweɪzɑr/) or quasi-stellar radio sources are the most energetic and distant members of a class of objects called active galactic nuclei (AGN). Quasars are extremely luminous and were first identified as being high redshift sources of electromagnetic energy, including radio waves and visible light, that appeared to be similar to stars, rather than extended sources similar to galaxies. Their spectra contain very broad emission lines, unlike any known from stars, hence the name ""quasi-stellar."" Their luminosity can be 100 times greater than that of the Milky Way. Most quasars were formed approximately 12 billion years ago caused by collisions of galaxies and their central black holes merging to form either a supermassive black hole or a Binary black hole system.Although the true nature of these objects was controversial until the early 1980s, there is now a scientific consensus that a quasar is a compact region in the center of a massive galaxy surrounding a central supermassive black hole. Its size is 10–10,000 times the Schwarzschild radius of the black hole. The energy emitted by a quasar derives from mass falling onto the accretion disc around the black hole.