Manuscript - Kapteyn Astronomical Institute
... The red asterisks in the left panel of Fig. 1 show ηgal as function of halo mass. As indicated by the median trend (red solid line), halos become increasingly inefficient in collecting baryons onto galaxies as they become less massive: for Mvir < 1010 h−1 M⊙ , ηgal ∼ 1 − 10%. This is the result of a ...
... The red asterisks in the left panel of Fig. 1 show ηgal as function of halo mass. As indicated by the median trend (red solid line), halos become increasingly inefficient in collecting baryons onto galaxies as they become less massive: for Mvir < 1010 h−1 M⊙ , ηgal ∼ 1 − 10%. This is the result of a ...
General relativistic spectra of accretion discs around rapidly
... result, the plotted spectra for these two cases lie almost on top of each other. However, for i ¼ 08 the flux corresponding to the massshed configuration is slightly higher than that for V ¼ 0, while the case is opposite at higher inclinations. This is a result of the inclination dependence of the ð ...
... result, the plotted spectra for these two cases lie almost on top of each other. However, for i ¼ 08 the flux corresponding to the massshed configuration is slightly higher than that for V ¼ 0, while the case is opposite at higher inclinations. This is a result of the inclination dependence of the ð ...
nuclear
... persistent X-ray emission (arising from accretion) constrains the burst energetics - the -value • Compactness of the neutron star means that accretion liberates roughly 50% of the rest-mass energy of the accreted material • Nuclear burning is much less efficient, at around 1%; expected ratio is the ...
... persistent X-ray emission (arising from accretion) constrains the burst energetics - the -value • Compactness of the neutron star means that accretion liberates roughly 50% of the rest-mass energy of the accreted material • Nuclear burning is much less efficient, at around 1%; expected ratio is the ...
Phenomenon of total external reflection of x rays
... an important and often a unique source of information on the fundamental properties of solids, liquids, and interfaces. The phenomenon of total external reflection underlies a traditional branch of x-ray optics which is being used increasingly in research and physics, astrophysics, and biology.4 We ...
... an important and often a unique source of information on the fundamental properties of solids, liquids, and interfaces. The phenomenon of total external reflection underlies a traditional branch of x-ray optics which is being used increasingly in research and physics, astrophysics, and biology.4 We ...
A105 Stars and Galaxies
... galaxies) between the source object and the observer • Gravitational lensing is predicted by Einstein's theory of general relativity (Einstein 1936) ...
... galaxies) between the source object and the observer • Gravitational lensing is predicted by Einstein's theory of general relativity (Einstein 1936) ...
The fuelling of local supermassive black holes
... Thanks to Chandra (=highest angular resolution ever), a few of these questions can be addressed [ both the hot ISM and the nuclear emission show up in the X-ray band ]. ...
... Thanks to Chandra (=highest angular resolution ever), a few of these questions can be addressed [ both the hot ISM and the nuclear emission show up in the X-ray band ]. ...
Sterrenstelsels en Cosmologie Docent: M. Franx, kamer 425
... As can be seen, the galaxy does not really stop ! As the objects are extended, we like to describe the distribution of light on the sky, and not just the total magnitude (which would be appropriate for a star). Hence we measure the amount of light per area on the sky. This is called the surface brig ...
... As can be seen, the galaxy does not really stop ! As the objects are extended, we like to describe the distribution of light on the sky, and not just the total magnitude (which would be appropriate for a star). Hence we measure the amount of light per area on the sky. This is called the surface brig ...
Misalignment & Nucleosynthesis in Microquasars Yousaf M. Butt , Thomas J. Maccarone
... anomalously high Li enhancements (roughly ~20-200 times the sun’s photospheric value) seen in the companions of some black-hole X-ray binary systems. (Such enhancements are puzzling since Li nuclei are exceedingly fragile - being easily destroyed in the interiors of stars - and Li would be expected ...
... anomalously high Li enhancements (roughly ~20-200 times the sun’s photospheric value) seen in the companions of some black-hole X-ray binary systems. (Such enhancements are puzzling since Li nuclei are exceedingly fragile - being easily destroyed in the interiors of stars - and Li would be expected ...
Using AO to Measure the Star Formation Histories of Massive Galaxies
... The age and metallicity distributions of stars in bulges and disks are sensitive indicators of galaxy formation physics. Resolved stellar populations can be used to measure the entire star formation and chemical enrichment histories of galaxies. Spatial resolution is the most critical capability nee ...
... The age and metallicity distributions of stars in bulges and disks are sensitive indicators of galaxy formation physics. Resolved stellar populations can be used to measure the entire star formation and chemical enrichment histories of galaxies. Spatial resolution is the most critical capability nee ...
Anna Frebel nucleosynthesis, stars + chemical evolution
... r-Process Enhanced Stars (rapid neutron-capture process) Responsible for the production of the heaviest elements Most likely production site: SNe II => pre-enrichment Chemical “fingerprint” of previous nucleosynthesis event (only “visible” in the oldest stars because of low metallicity) ~5% ...
... r-Process Enhanced Stars (rapid neutron-capture process) Responsible for the production of the heaviest elements Most likely production site: SNe II => pre-enrichment Chemical “fingerprint” of previous nucleosynthesis event (only “visible” in the oldest stars because of low metallicity) ~5% ...
Great Migrations & other natural history tales
... extends inwards to an ultra-hot accretion disk with a few AU from the BH. This disk feeds matter into the BH, where gravity compresses and heats the material. Hot gas rushes from the vicinity of the BH creating the radio jets. The jets are aligned perpendicular to the disk. This provides strong circ ...
... extends inwards to an ultra-hot accretion disk with a few AU from the BH. This disk feeds matter into the BH, where gravity compresses and heats the material. Hot gas rushes from the vicinity of the BH creating the radio jets. The jets are aligned perpendicular to the disk. This provides strong circ ...
FIRST LIGHT IN THE UNIVERSE
... • Great progress using v,i,z,J-band drop outs to probe abundance of SF galaxies from 3
... • Great progress using v,i,z,J-band drop outs to probe abundance of SF galaxies from 3
Astronomy Astrophysics Circumstellar emission in Be/X-ray binaries of the Magellanic
... Our main goals are exploring whether previously published relations, valid for isolated Be stars, are applicable to Be/X-ray binaries and computing the distance to these systems after correcting for the effects of the circumstellar contamination. Methods. Simultaneous U BVRI photometry and spectra in ...
... Our main goals are exploring whether previously published relations, valid for isolated Be stars, are applicable to Be/X-ray binaries and computing the distance to these systems after correcting for the effects of the circumstellar contamination. Methods. Simultaneous U BVRI photometry and spectra in ...
Quasars
... Lobes sometimes linked to nucleus by thin filaments called radio jets (relativistic: particles moving at velocities close to c) ...
... Lobes sometimes linked to nucleus by thin filaments called radio jets (relativistic: particles moving at velocities close to c) ...
Conceptual Design of the International Axion Observatory (IAXO)
... predecessor. The bore, located between the two coils of the magnet, was evacuated and higherperformance detectors were installed [22, 23, 24]. This new setup resulted in an improved upper limit in the mass range up to 0.03 eV of gaγ (95% CL) < 6.0 × 10−10 GeV−1 . Later experimental improvements inc ...
... predecessor. The bore, located between the two coils of the magnet, was evacuated and higherperformance detectors were installed [22, 23, 24]. This new setup resulted in an improved upper limit in the mass range up to 0.03 eV of gaγ (95% CL) < 6.0 × 10−10 GeV−1 . Later experimental improvements inc ...
Dark Stars: Dark Matter Annihilation in the First Stars.
... • But you never know! They might exist today. • Once the DM runs out, switches to fusion. ...
... • But you never know! They might exist today. • Once the DM runs out, switches to fusion. ...
Stellar Winds and Hydrodynamic Atmospheres of Stars
... star with 8 Msun on main sequence ends up with 1 Msun 7 Msun re-cycled to ISM ejection of Planetary Nebula at tip of AGB ...
... star with 8 Msun on main sequence ends up with 1 Msun 7 Msun re-cycled to ISM ejection of Planetary Nebula at tip of AGB ...
The Swift satellite lives up to its name, revealing cosmic
... host galaxy, lying at a distance z=0.16. Thereafter several more afterglow detections were made at both X-ray and optical wavelengths. The sample shows that while short GRB afterglows are generally less distant, their afterglows are intrinsically fainter than the long GRBs but follow the same decays ...
... host galaxy, lying at a distance z=0.16. Thereafter several more afterglow detections were made at both X-ray and optical wavelengths. The sample shows that while short GRB afterglows are generally less distant, their afterglows are intrinsically fainter than the long GRBs but follow the same decays ...
Evidence for Black Holes
... established observationally. Stellar-mass black holes are presumably the collapsed remnants of massive stars. Except for two recent candidates based on gravitational microlensing surveys (10, 11), all of the several dozen stellar-mass black hole candidates have been found in x-ray binaries, close bi ...
... established observationally. Stellar-mass black holes are presumably the collapsed remnants of massive stars. Except for two recent candidates based on gravitational microlensing surveys (10, 11), all of the several dozen stellar-mass black hole candidates have been found in x-ray binaries, close bi ...
eROSITA Mission Definition Document
... rate were about two orders of magnitude higher in the early universe than today. The decline of this activity occurred at a surprisingly recent stage in cosmic history and is as yet not understood. In particular, deep X-ray surveys have shown, that lower-luminosity AGN (Seyfert galaxies) show a maxi ...
... rate were about two orders of magnitude higher in the early universe than today. The decline of this activity occurred at a surprisingly recent stage in cosmic history and is as yet not understood. In particular, deep X-ray surveys have shown, that lower-luminosity AGN (Seyfert galaxies) show a maxi ...
Draft paper (Published in ApJL)
... halos rather than as definitive predictions to be compared directly with observation. The importance of “cosmic web stripping” has not been recognized before because it is a purely hydrodynamical effect that would be completely missed in semianalytic modeling and that requires simulations of large v ...
... halos rather than as definitive predictions to be compared directly with observation. The importance of “cosmic web stripping” has not been recognized before because it is a purely hydrodynamical effect that would be completely missed in semianalytic modeling and that requires simulations of large v ...
PDF only - at www.arxiv.org.
... central black hole on the order of 109 solar masses (Msun) (9), it is an exceptionally luminous AGN in the local universe and might be regarded as a counterpart of the accreting supermassive black holes during the peak of quasar activity at high redshift. Since the earliest X-ray observations, PDS 4 ...
... central black hole on the order of 109 solar masses (Msun) (9), it is an exceptionally luminous AGN in the local universe and might be regarded as a counterpart of the accreting supermassive black holes during the peak of quasar activity at high redshift. Since the earliest X-ray observations, PDS 4 ...
Supplemental Educational Support Materials
... gravitational force that attracts all other masses. The more massive the object, the stronger the gravitational force. The closer objects are to each other, the stronger the gravitational attraction. ...
... gravitational force that attracts all other masses. The more massive the object, the stronger the gravitational force. The closer objects are to each other, the stronger the gravitational attraction. ...
1 Introduction - Wiley-VCH
... the submillimeter domain (250 μm, Herschel space mission), where dust heating from the general interstellar field becomes more important. This clumpy structure can be also seen in the radio continuum (VLA) given that the relativistic electrons responsible for the synchrotron emission are accelerated ...
... the submillimeter domain (250 μm, Herschel space mission), where dust heating from the general interstellar field becomes more important. This clumpy structure can be also seen in the radio continuum (VLA) given that the relativistic electrons responsible for the synchrotron emission are accelerated ...
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.