Refusing to Go Quietly: GRBs and Their Progenitors
... Designed to detect nuclear tests (in violation of the test ban treaty), the Vela satellites discovered GRBs ...
... Designed to detect nuclear tests (in violation of the test ban treaty), the Vela satellites discovered GRBs ...
The Be/X-ray transient 4U 0115+ 63/V635 Cassiopeiae
... stars ranges from 3 to 12 stellar radii. The separation of the two peaks of Hα, ∆vpeak , is significantly wider than 2v sin i (RHα /R∗ )−1 expected in an angular-momentum conserving disc, but is consistent with a disc structure in which the rotation velocity is near Keplerian. Although there is no w ...
... stars ranges from 3 to 12 stellar radii. The separation of the two peaks of Hα, ∆vpeak , is significantly wider than 2v sin i (RHα /R∗ )−1 expected in an angular-momentum conserving disc, but is consistent with a disc structure in which the rotation velocity is near Keplerian. Although there is no w ...
Galaxy Formation,! Reionization, ! the First Stars and Quasars! Ay 127!
... F IG . 4.— Joint constraints on the reionization history, assuming ionizing photon contributions from galaxies with MUV < −17 (maximum likelihood model shown as dashed line in all panels), MUV < −10 (maximum likelihood model shown as dotted line in all panels), and MUV < −13 (maximum likelihood mode ...
... F IG . 4.— Joint constraints on the reionization history, assuming ionizing photon contributions from galaxies with MUV < −17 (maximum likelihood model shown as dashed line in all panels), MUV < −10 (maximum likelihood model shown as dotted line in all panels), and MUV < −13 (maximum likelihood mode ...
L12-no equations
... Description of a black hole is entirely based on theory of General Relativity beyond scope of this course. But simple arguments can be illustrative: Black holes are completely collapsed objects - radius of the “star” becomes so small that the escape velocity approaches the speed of light: Escape vel ...
... Description of a black hole is entirely based on theory of General Relativity beyond scope of this course. But simple arguments can be illustrative: Black holes are completely collapsed objects - radius of the “star” becomes so small that the escape velocity approaches the speed of light: Escape vel ...
Ercolano et al. 2009 - Institute of Astronomy
... The interplay of gas dynamics and radiation is at the basis of many fundamental astrophysical questions. Some examples in star formation include: 1) Low Mass Star/Planet Formation – Protoplanetary disk evolution and dispersal 2) High mass star formation – Radiation Pressure on ...
... The interplay of gas dynamics and radiation is at the basis of many fundamental astrophysical questions. Some examples in star formation include: 1) Low Mass Star/Planet Formation – Protoplanetary disk evolution and dispersal 2) High mass star formation – Radiation Pressure on ...
Document
... The luminosity distribution is mostly determined by the ISM distribution, then – by the galactic potential. It is important that maxima of the ISM distribution and distribution of compact objects roughly coincide. This results in relatively sharp maximum in the luminosity distribution. ...
... The luminosity distribution is mostly determined by the ISM distribution, then – by the galactic potential. It is important that maxima of the ISM distribution and distribution of compact objects roughly coincide. This results in relatively sharp maximum in the luminosity distribution. ...
Document
... The luminosity distribution is mostly determined by the ISM distribution, then – by the galactic potential. It is important that maxima of the ISM distribution and distribution of compact objects roughly coincide. This results in relatively sharp maximum in the luminosity distribution. ...
... The luminosity distribution is mostly determined by the ISM distribution, then – by the galactic potential. It is important that maxima of the ISM distribution and distribution of compact objects roughly coincide. This results in relatively sharp maximum in the luminosity distribution. ...
The Historical X-ray Transient KY TrA in quiescence
... outburst in 1990 which was significantly fainter than the discovery 1974 outburst (Barret et al. 1995). Six months later, an upper limit to the quiescent X-ray luminosity of ∼2–10 × 1033 erg s−1 was derived. The ultrasoft X-ray spectrum seen by Ariel V and the ...
... outburst in 1990 which was significantly fainter than the discovery 1974 outburst (Barret et al. 1995). Six months later, an upper limit to the quiescent X-ray luminosity of ∼2–10 × 1033 erg s−1 was derived. The ultrasoft X-ray spectrum seen by Ariel V and the ...
A Direct Empirical Proof of the Existence of Dark Matter
... measured shear for galaxies divided into crude redshift bins using photometric redshifts (Wittman et al. 2003), we further limit the redshift of the lensing objects to 0.18 < z < 0.39. This range is consistent with the clus ter redshift, but corresponds to a large volume in which a structure unasso ...
... measured shear for galaxies divided into crude redshift bins using photometric redshifts (Wittman et al. 2003), we further limit the redshift of the lensing objects to 0.18 < z < 0.39. This range is consistent with the clus ter redshift, but corresponds to a large volume in which a structure unasso ...
Associated Spectral and Temporal State Transition of the
... Stellar mass black hole X-ray binaries exhibit X-ray spectral states which also have distinct and characteristic temporal properties. These states are believed to correspond to different accretion disc geometries. We present analysis of two XMM-Newton observations of the Ultra-Luminous X-ray source ...
... Stellar mass black hole X-ray binaries exhibit X-ray spectral states which also have distinct and characteristic temporal properties. These states are believed to correspond to different accretion disc geometries. We present analysis of two XMM-Newton observations of the Ultra-Luminous X-ray source ...
PDF document
... DEC(J2000)= +17 04 18.2). The host is well resolved and displays a disturbed, late-type morphology. The location at which the GRB occurred (determined from ground-based imaging) is marked as a red circle, lying slightly off a tidally distorted spiral arm. The left-hand panel shows the host and surro ...
... DEC(J2000)= +17 04 18.2). The host is well resolved and displays a disturbed, late-type morphology. The location at which the GRB occurred (determined from ground-based imaging) is marked as a red circle, lying slightly off a tidally distorted spiral arm. The left-hand panel shows the host and surro ...
Sin título de diapositiva - Universitat de Barcelona
... The GAIA mission, the next ESA Cornerstone 6 (launch 2010- 2012), will create a precise three dimensional map of about one billion stars throughout our Galaxy and beyond. To reach the scientific goals, that is to quantify the dynamical, chemical and star formation evolution of the Milky Way, it is c ...
... The GAIA mission, the next ESA Cornerstone 6 (launch 2010- 2012), will create a precise three dimensional map of about one billion stars throughout our Galaxy and beyond. To reach the scientific goals, that is to quantify the dynamical, chemical and star formation evolution of the Milky Way, it is c ...
Polarization radiation from the accretion disk and
... along the field lines of the white dwarf to its magnetic poles. White dwarf rotates around its axis asynchronously ( faster than the orbits ) . Polar Star or type AM Her ( right). The magnetic field of the white dwarf has a tension ~ 108 G. Disc not formed at all, the accretion of matter is made dir ...
... along the field lines of the white dwarf to its magnetic poles. White dwarf rotates around its axis asynchronously ( faster than the orbits ) . Polar Star or type AM Her ( right). The magnetic field of the white dwarf has a tension ~ 108 G. Disc not formed at all, the accretion of matter is made dir ...
Sec 29.3 - Highland High School
... nuclear reactions because it is supported by the resistance of electrons being squeezed together. This pressure counteracts gravity and can support the core as long as the mass of the remaining core is less than about 1.4 times the mass of the Sun. ...
... nuclear reactions because it is supported by the resistance of electrons being squeezed together. This pressure counteracts gravity and can support the core as long as the mass of the remaining core is less than about 1.4 times the mass of the Sun. ...
0004-637X 778 2 119
... torques (Rea et al. 2013). This can actually be taken as an upper limit to the strength of the dipole field. If the neutron star is evolving with an active fallback disk, the dipole field strength that can produce the properties of this source could be in the (1–2) × 1012 G range on the surface of t ...
... torques (Rea et al. 2013). This can actually be taken as an upper limit to the strength of the dipole field. If the neutron star is evolving with an active fallback disk, the dipole field strength that can produce the properties of this source could be in the (1–2) × 1012 G range on the surface of t ...
Expected Coalescence Rate of NS/NS Binaries for Laser Beam
... the star formation rate is proportional to the available mass of gas as, R*(t) ~ e-at present work: the star formation history is reconstructed from observations: ages of 552 stars derived from chromospheric activity index (Rocha-Tinto et al., 2000) enhanced periods of star formation at 1 Gyr, 2 ...
... the star formation rate is proportional to the available mass of gas as, R*(t) ~ e-at present work: the star formation history is reconstructed from observations: ages of 552 stars derived from chromospheric activity index (Rocha-Tinto et al., 2000) enhanced periods of star formation at 1 Gyr, 2 ...
Investigation of substrates and mounting techniques for the High
... substrates for our hard X-ray optics. These glasses are produced by a method, known as ‘overflow’, in which the glass sheet is never in mechanical contact with any surface. Deviations from uniformity are small, with the most pronounced error being a variation in thickness of 25 µm from one side of t ...
... substrates for our hard X-ray optics. These glasses are produced by a method, known as ‘overflow’, in which the glass sheet is never in mechanical contact with any surface. Deviations from uniformity are small, with the most pronounced error being a variation in thickness of 25 µm from one side of t ...
Supernovae and compact objects
... I noticed that a new and unusual star, surpassing the other stars in brilliancy, was shining almost directly above my head; and since I had, from boyhood, known all the stars of the heavens perfectly, it was quite evident to me that there had never been any star in that place of the sky, even the sm ...
... I noticed that a new and unusual star, surpassing the other stars in brilliancy, was shining almost directly above my head; and since I had, from boyhood, known all the stars of the heavens perfectly, it was quite evident to me that there had never been any star in that place of the sky, even the sm ...
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... universe was much more active in the past (z ~1 - 2) but what happens earlier is unclear There are many complications of interpretation, including the reliability of each SFR ...
... universe was much more active in the past (z ~1 - 2) but what happens earlier is unclear There are many complications of interpretation, including the reliability of each SFR ...
Coming Home - Marcia Bartusiak
... the galactic plane is blocked by scaHered dust. In the infrared (middle) we see primarily the heat radiation from this dust. The radio image (boHom) shows the distribution of carbon monoxide gas, which is found in the dense molecular clouds where stars are born. (The images are 360-degree views of t ...
... the galactic plane is blocked by scaHered dust. In the infrared (middle) we see primarily the heat radiation from this dust. The radio image (boHom) shows the distribution of carbon monoxide gas, which is found in the dense molecular clouds where stars are born. (The images are 360-degree views of t ...
IGR J18483-0311: a new intermediate supergiant fast X
... X-ray transients (SFXTs, Negueruela et al. 2006). IGR J18483−0311 was discovered during observations performed with INTEGRAL in 2003 April 23-28 (Chernyakova et al. 2003), and it was found to have average fluxes of about 10 mCrab and 5 mCrab in the 15−40 keV and 40−100 keV bands, respectively. Molko ...
... X-ray transients (SFXTs, Negueruela et al. 2006). IGR J18483−0311 was discovered during observations performed with INTEGRAL in 2003 April 23-28 (Chernyakova et al. 2003), and it was found to have average fluxes of about 10 mCrab and 5 mCrab in the 15−40 keV and 40−100 keV bands, respectively. Molko ...
G040141-00 - DCC
... • Make a catalogue of potential sources of normal modes (T. Regimbau) – Glitches in radio pulsars, especially Crab and Vela • Set up collaborations with Radio, Gamma and X-ray Astronomers to set up time-windows to search for normal modes ...
... • Make a catalogue of potential sources of normal modes (T. Regimbau) – Glitches in radio pulsars, especially Crab and Vela • Set up collaborations with Radio, Gamma and X-ray Astronomers to set up time-windows to search for normal modes ...
how to do it? QSO Absorption Lines and
... conditions) AND is equally sensitive for both close and far galaxies… ...
... conditions) AND is equally sensitive for both close and far galaxies… ...
Measuring the orbital periods of low mass X-ray binaries in the X
... However, there are still some difficulties with measuring the orbital periods in the optical band. First, some X-ray binaries have no identified optical counterparts. The Galactic HMXBs are mostly distributed around the Galactic plane where the extinction in the optical band is high. For LMXBs, some ...
... However, there are still some difficulties with measuring the orbital periods in the optical band. First, some X-ray binaries have no identified optical counterparts. The Galactic HMXBs are mostly distributed around the Galactic plane where the extinction in the optical band is high. For LMXBs, some ...
It is now recognized that the vast majority of ellipticals are of
... • The dust lanes seen in E galaxies imply that the absorbing material is distributed in rings or disks. Dust lanes may be aligned with either the major or minor axes, or they may be warped. • E galaxies contain modest amounts of cool and warm gas, although not as much as is found in S galaxies. A fe ...
... • The dust lanes seen in E galaxies imply that the absorbing material is distributed in rings or disks. Dust lanes may be aligned with either the major or minor axes, or they may be warped. • E galaxies contain modest amounts of cool and warm gas, although not as much as is found in S galaxies. A fe ...
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.