Protogalaxies Encyclopedia of Astronomy & Astrophysics eaa.iop.org S G Djorgovski
... of galaxy formation would have different and equally legitimate definitions in mind. For example, an observer may mean ‘the first major burst of star formation in a progenitor of a present-day elliptical galaxy’, whereas a theorist may mean ‘the peak merging epoch of dark halos of the fragments whic ...
... of galaxy formation would have different and equally legitimate definitions in mind. For example, an observer may mean ‘the first major burst of star formation in a progenitor of a present-day elliptical galaxy’, whereas a theorist may mean ‘the peak merging epoch of dark halos of the fragments whic ...
Galaxy Collisions, Gas Stripping and Star Formation in the Evolution
... enhanced. Low relative velocity encounters lead to galaxy mergers. The central dominating galaxies in future clusters form before the clusters in a merging process in galaxy groups. Galaxy clusters are composed in a hierarchical scenario due to relaxation processes between galaxies and galaxy groups ...
... enhanced. Low relative velocity encounters lead to galaxy mergers. The central dominating galaxies in future clusters form before the clusters in a merging process in galaxy groups. Galaxy clusters are composed in a hierarchical scenario due to relaxation processes between galaxies and galaxy groups ...
Protogalaxies
... of galaxy formation would have different and equally legitimate definitions in mind. For example, an observer may mean ‘the first major burst of star formation in a progenitor of a present-day elliptical galaxy’, whereas a theorist may mean ‘the peak merging epoch of dark halos of the fragments whic ...
... of galaxy formation would have different and equally legitimate definitions in mind. For example, an observer may mean ‘the first major burst of star formation in a progenitor of a present-day elliptical galaxy’, whereas a theorist may mean ‘the peak merging epoch of dark halos of the fragments whic ...
Extended Infrared Emission from LIRGs
... … resemble those of local LIRGs rather than ULIRGs. Kinematical evidence from ionized (Hα) and molecular (CO) gas are consistent the presence of extended (~5kpc) star forming disks There is a “broad” connection between mid-IR emission and star formation rates (with some caveats…) We wish to quantify ...
... … resemble those of local LIRGs rather than ULIRGs. Kinematical evidence from ionized (Hα) and molecular (CO) gas are consistent the presence of extended (~5kpc) star forming disks There is a “broad” connection between mid-IR emission and star formation rates (with some caveats…) We wish to quantify ...
Galaxy Evolution
... have the same intrinsic brightness? • If all arise from CO white dwarfs that explode at the white dwarf mass limit, should they all be the same? ...
... have the same intrinsic brightness? • If all arise from CO white dwarfs that explode at the white dwarf mass limit, should they all be the same? ...
FERMI GBM detections of four AXPs at soft gamma-rays
... (1979) observed another, much weaker, burst from the same source. After these first observations several other sources with repeated bursts in the X- and γ-rays were detected. Several years later, in 1994, SGRs were discovered to show persistent X-ray emission by Vasisht et al. (1994), Rothschild et ...
... (1979) observed another, much weaker, burst from the same source. After these first observations several other sources with repeated bursts in the X- and γ-rays were detected. Several years later, in 1994, SGRs were discovered to show persistent X-ray emission by Vasisht et al. (1994), Rothschild et ...
Chandra
... photospheric abundances by selectively removing certain elements (Babel 1995). This paper, however, will focus on high-density, O-star winds, in which momentum sharing is quite efficient. An accelerating wind, by definition, consists of material at a range of velocities. The velocity dispersion in t ...
... photospheric abundances by selectively removing certain elements (Babel 1995). This paper, however, will focus on high-density, O-star winds, in which momentum sharing is quite efficient. An accelerating wind, by definition, consists of material at a range of velocities. The velocity dispersion in t ...
neutron star
... BLACK HOLE VERIFICATION • We need to measure mass by: — Using orbital properties of a companion — Measuring the velocity and distance of orbiting gas ...
... BLACK HOLE VERIFICATION • We need to measure mass by: — Using orbital properties of a companion — Measuring the velocity and distance of orbiting gas ...
Slide 1
... presence of dust lanes in ESO243-49 could provide evidence for a recent or on-going gas-rich interaction (Shabala et al. 2011) Number density of X-ray sources similar to HLX-1 ~ 10-6 Mpc-3 following this scenario (Mapelli et al. 2012) – HLX-1 distance ~ 100 Mpc ...
... presence of dust lanes in ESO243-49 could provide evidence for a recent or on-going gas-rich interaction (Shabala et al. 2011) Number density of X-ray sources similar to HLX-1 ~ 10-6 Mpc-3 following this scenario (Mapelli et al. 2012) – HLX-1 distance ~ 100 Mpc ...
The keV–TeV connection in gamma-ray binaries
... The gamma-ray emission from astrophysical sources is arguably different from the emission in the rest of the electromagnetic spectrum because it cannot be generated by hot matter. High energy gamma radiation is therefore an indication that non-thermal processes, which are able to concentrate a large ...
... The gamma-ray emission from astrophysical sources is arguably different from the emission in the rest of the electromagnetic spectrum because it cannot be generated by hot matter. High energy gamma radiation is therefore an indication that non-thermal processes, which are able to concentrate a large ...
Multi-Object Spectroscopy: Science Applications
... abundance of clusters explain the global decline of star formation? ...
... abundance of clusters explain the global decline of star formation? ...
VLT observations of GRS 1915+ 105
... Since the discovery of superluminal episodes in GRS 1915+105, this object has been under strong surveillance by several observers at different wavelengths. In spite of this work, the nature of the X-ray binary system in GRS 1915+105 is still a matter of debate. The strong interstellar absorption tow ...
... Since the discovery of superluminal episodes in GRS 1915+105, this object has been under strong surveillance by several observers at different wavelengths. In spite of this work, the nature of the X-ray binary system in GRS 1915+105 is still a matter of debate. The strong interstellar absorption tow ...
Document
... forms (enriched by previous stellar generations) • Z gives a 1st approximation to the chemical composition ...
... forms (enriched by previous stellar generations) • Z gives a 1st approximation to the chemical composition ...
Astronomy 305/Frontiers in Astronomy - Fermi Gamma
... On the night of August 27, 1998 Earth's upper atmosphere was bathed briefly by an invisible burst of gamma- and X-ray radiation. This pulse - the most powerful to strike Earth from beyond the solar system ever detected - had a significant effect on Earth's upper atmosphere, report Stanford researche ...
... On the night of August 27, 1998 Earth's upper atmosphere was bathed briefly by an invisible burst of gamma- and X-ray radiation. This pulse - the most powerful to strike Earth from beyond the solar system ever detected - had a significant effect on Earth's upper atmosphere, report Stanford researche ...
Young Galaxies Grow - Astronomical Society of the Pacific
... The spiral galaxy Messier 83 (M83), seen first in visible light, then in a GALEX Ultraviolet image. (In the GALEX image, yellow is “near” or longer wavelength UV, blue is “far” or shorter wavelength UV. Arrows point to two of the spiral arm extensions discovered.) Credits: Optical: R. Gendler; GALEX ...
... The spiral galaxy Messier 83 (M83), seen first in visible light, then in a GALEX Ultraviolet image. (In the GALEX image, yellow is “near” or longer wavelength UV, blue is “far” or shorter wavelength UV. Arrows point to two of the spiral arm extensions discovered.) Credits: Optical: R. Gendler; GALEX ...
CEA
... caused by velocity variations. Turbulent magnetic fields built up behind the shocks synchrotron power-law radiation spectrum Compton scattering to GeV range. Jetted fireball: fireball can be significantly collimated if progenitor is a massive star with rapid rotation escape route along the rot ...
... caused by velocity variations. Turbulent magnetic fields built up behind the shocks synchrotron power-law radiation spectrum Compton scattering to GeV range. Jetted fireball: fireball can be significantly collimated if progenitor is a massive star with rapid rotation escape route along the rot ...
Magnetars origin and progenitors with enhanced rotation'
... Magnetars origin and progenitors with enhanced rotation S.B. Popov, M.E. Prokhorov (Sternberg Astronomical Institute) ...
... Magnetars origin and progenitors with enhanced rotation S.B. Popov, M.E. Prokhorov (Sternberg Astronomical Institute) ...
Neutron star masses: dwarfs, giants and neighbors
... with short rotational periods indicates that the fraction of binaries among them substantially exceeds the observational estimates. To bring this fraction into agreement with the statistics for magnetars, the additional velocity acquired by a magnetar during its formation must be primarily perpendic ...
... with short rotational periods indicates that the fraction of binaries among them substantially exceeds the observational estimates. To bring this fraction into agreement with the statistics for magnetars, the additional velocity acquired by a magnetar during its formation must be primarily perpendic ...
Galaxies (Professor Powerpoint)
... There is so much space that the chances of stars colliding is extremely small, but huge clouds of gas and dust do collide. Collisions can merge galaxies together or hurl stars and gases out into space. These collisions can produce strong shock waves and new star formation. ...
... There is so much space that the chances of stars colliding is extremely small, but huge clouds of gas and dust do collide. Collisions can merge galaxies together or hurl stars and gases out into space. These collisions can produce strong shock waves and new star formation. ...
ASTRONOMIA SPAIN inglés.qxd
... what are the expected discoveries in the coming years? The problem mentioned before is part of a more general problem concerning the behaviour of degenerate stellar structures that are responsible for a large number of astrophysical phenomena. The rich and precise astrophysical data we are obtaining ...
... what are the expected discoveries in the coming years? The problem mentioned before is part of a more general problem concerning the behaviour of degenerate stellar structures that are responsible for a large number of astrophysical phenomena. The rich and precise astrophysical data we are obtaining ...
Is $^ 6$ Li in metal-poor halo stars produced in situ by solar
... production of 6 Li by stellar flares during the main sequence. It has been known for many years that the chromospheric and coronal activities of dwarf stars are closely related to their rotation (Kraft 1967). This relationship results from the generation and amplification of surface magnetic fields ...
... production of 6 Li by stellar flares during the main sequence. It has been known for many years that the chromospheric and coronal activities of dwarf stars are closely related to their rotation (Kraft 1967). This relationship results from the generation and amplification of surface magnetic fields ...
Y.Ueda_Future_HE_Mission2006 - X
... Mid IR + radio selection of type-2 QSOs at z~2 implys twice as large number density as Compton thin type-2 QSOs (Martines-Sansigre et al. ...
... Mid IR + radio selection of type-2 QSOs at z~2 implys twice as large number density as Compton thin type-2 QSOs (Martines-Sansigre et al. ...
"Experimental study of charge diffusion in the undepleted silicon of X-ray CCDs"
... events can be meaningfully analyzed: Events falling close to the edge of the detector are rejected; If there is an overlap between two events, indicating pile-up, both events are rejected; Vertically split events which have signal in two adjacent rows are also rejected, such events can be produced e ...
... events can be meaningfully analyzed: Events falling close to the edge of the detector are rejected; If there is an overlap between two events, indicating pile-up, both events are rejected; Vertically split events which have signal in two adjacent rows are also rejected, such events can be produced e ...
Low frequency radio observations of gamma-ray binaries
... new ideas and new theoretical perspectives are taken into account in order to maintain a consistent model which explains the observations of high energy sources. High-Energy Astrophysics is the study of those astrophysical systems displaying X-ray or gamma-ray emission, but also those which emits ne ...
... new ideas and new theoretical perspectives are taken into account in order to maintain a consistent model which explains the observations of high energy sources. High-Energy Astrophysics is the study of those astrophysical systems displaying X-ray or gamma-ray emission, but also those which emits ne ...
Astrophysical X-ray source
Astrophysical X-ray sources are astronomical objects with physical properties which result in the emission of X-rays.There are a number of types of astrophysical objects which emit X-rays, from galaxy clusters, through black holes in active galactic nuclei (AGN) to galactic objects such as supernova remnants, stars, and binary stars containing a white dwarf (cataclysmic variable stars and super soft X-ray sources), neutron star or black hole (X-ray binaries). Some solar system bodies emit X-rays, the most notable being the Moon, although most of the X-ray brightness of the Moon arises from reflected solar X-rays. A combination of many unresolved X-ray sources is thought to produce the observed X-ray background. The X-ray continuum can arise from bremsstrahlung, either magnetic or ordinary Coulomb, black-body radiation, synchrotron radiation, inverse Compton scattering of lower-energy photons be relativistic electrons, knock-on collisions of fast protons with atomic electrons, and atomic recombination, with or without additional electron transitions.Furthermore, celestial entities in space are discussed as celestial X-ray sources. The origin of all observed astronomical X-ray sources is in, near to, or associated with a coronal cloud or gas at coronal cloud temperatures for however long or brief a period.