... It is reasonable to expect a priori that the evolution of events is strongly time dependent, so the star formation history in a galaxy is another important parameter. Therefore, by calculating the evolution of events after a -function like star formation burst,   one gets a Green function for any arbitrary star formation history. ... The source evolution in a galaxy with given star formation rate is thus calculated as . ...

Local galaxies are in a state of energy equipartition which means that the kinetic energy density equals roughly the thermal one and the magnetic one. ... In models of young galaxies magnetic fields are usually not considered as they are assumed not to be dynamical important at high redshifts. In the presence of turbulence, however, the turbulent dynamo can amplify weak magnetic seed fields by randomly stretching, twisting, and folding the field lines. ...

. Next: Parameterised post-Newtonian Formalism Up: Binary Neutron Stars Previous: Strong Equivalence Principle: Solar . љ . - Damour & Schafer 1991 . (PSR B1855+09) . Relativistic precession? . Finite probability that and cancel due to precession . If precession time << age and Galactic orbit time, deal with precession statistically and obtain upper limit . With several pulsars, probabilities mulitply! . - Wex 1996 (7 MSPs) . Same as weak field limit . Jon Bell . Thu Dec 19 15:15:11 GMT 1996

... We present a computer program for modelling energy flux distribution and light curves of eclipsing binaries from far ultraviolet to infrared regions. The Roche model is assumed. Proximity effects of components (reflection of radiation and surface gravity darkening) are taken into account. ... Figure 1: The surface temperature distribution for Algol A-B system before (upper plot) and after (lower plot) correction for temperature due to the irradiation effect. ...

... In brief: the frequency-dependent radiative transfer equation is solved for a dust under assumption of spherically-symmetric geometry for its distribution taking into account particle size distribution and quantum heating effects for the very small dust particles. ... Table: Model parameters for IRAS04296+3429. ... parameter . ... hot dust shell) . ... The best fit to the spectral energy distribution of IRAS04296 is shown by heavy solid line (see Table2 for details concerning parameters of the model...

From Herschel's catalog, the first accurate stellar parallax measurement of 0.32 seconds of arc for the star 61 Cygni was published by the F.W. Bessel in 1838. ... This distance is equivalent to 3.26 light years. ... The Universe was now a large place and the intrinsic energy output of the stars had to be huge in order that their light could reach us. ... An Orbit in Curved Space This is a prediction made by General Relativity and confirmed by direct observation of Mercury. ...

XMM-Newton Science Analysis System . ... Meta Index / Home Page / Description / Output The fraction of counts contained within the source region assuming a point source located at the centre of the region. The EXTENDED mode (King profile) PSF is used to calculate the fraction assuming a fixed photon energy of 1.5 keV. This is currently only implemented for circular source regions, other shapes will give the wrong factor. XMM-Newton SOC/SSC -- 2007-07-09 ...

Next: Catalog Construction Up: Observations and Analysis Previous: Source Detections . ... It was assumed that the highest signal gives the most likely position of the source. ... Comparing the summed map with the maps from the individual energy ranges, the one which produced the smallest error box was chosen to represent the source position, as long as was greater than 4, a level chosen to reflect a reasonable degree of confidence in the detection. ...

PSR J1738+0333 is a 5.85-ms pulsar in a binary system with an orbital period of 8.5 hours and a companion white dwarf (WD) with a mass of about 0.2 solar masses. ... However, there seem to be small dispersive delays near superior conjunction. ... Knowing the component masses, we can predict, assuming the validity of general relativity (GR), a few other relativistic effects, like the Shapiro delay or the rate of orbital decay due to the emission of gravitational waves. ... These would be: . ...

PHYSICS Part IA Wednesday 19 January 2009 SELWYN COLLEGE REVISION TEST Attempt all three questions from section A and any two from section B. SECTION A ­ answer all questions. ... 5] A2 A3 SECTION B ­ answer two questions B4. ... 5] A uniform solid cylinder rolls from rest without slipping down a rough inclined plane, then along a horizontal section where the surface texture changes from rough to smooth, and finally up a second inclined plane with a perfectly-smooth surface. ...

Astronomy Discussion Forums . ... God and Science ћ SETI ћ Software ћ UFO ћ XEphem . ... SETI Assumes ET Doesnot Care About Can Being Detected What If . ... Post Message | ... My search on how to go undetected in space and SETI Search for Extraterrestrial Intelligence SETI. ... www.astronomy.net . About Astronomy Net | Advertise on Astronomy Net | ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

... The basic principles of incoherent scatter: . ... Because of the electron movement, spectrum of the observed signal is broad and it has shape which depends, e.g., on the temperature. ... ion temperature . ... According to the theory, Ti should be replaced by (2Ti,perp + Ti,par)/3 (Williams and Jain,1986; Glatthor and Hernandez, 1990; Winser et al., 1990). ... Glatthor, N., and R. Hernandez, Temperature anisotropy of drifting ions in the auroral F-region, observed by EISCAT, J. atmos. terr. ...

... Just like our own Milky Way Galaxy, the nearest major galaxy M31 has many star systems spewing high energy radiation. ... The strongest source of X-rays in the Large Magellanic Cloud originates from an unusually energetic binary star system. ... Gas stripped of the normal star falls onto the compact star, heats up, and emits X-rays. ... NGC 6240: When Galaxies Collide . ... Our Sun is unusual in that it is alone - most stars occur in multiple or binary systems. ... Uranus' Moon Miranda . ...

We present and disucss observations of a flare event on the dM4.5e star AT Mic (Gl 799AB). These data show evidence of an energetic flare with a radiated energy of 3 10$^{31}$ erg in the range 3600-4200$\AA$. ... Simple models were applied to derive order of magnitude estimates for the mass and kinetic energy budget of the flare for assumed electron density, ionization fraction and temperature values. ... Key words: stars: flares - stars: UV ceti-type - stars: magetic activity ...

... To read data from a ROSAT tape use the task t2d . ... Detailed List of RDF FITS Files: . PSPC RDF tape list tape001 - list of files on tape tape002 - rp110590n00_bas. fits Photon event and good times tape003 - rp110590n00_im1. fits Broad band image tape004 - rp110590n00_im2. fits Hard (0.5-2 keV) band image tape005 - rp110590n00_im3. fits Soft (0.1-0.4 keV) band image tape006 - rp110590n00_bk1. fits Broad background image tape007 - rp110590n00_bk2 ...

GERSHTEIN-ZELDOVICH BOUND AND COSMOLOGICAL RESTRICTIONS ON NEUTRINO MASS A.D. Dolgov 20-24 December, 2004 COSMOLOGY AND ASTROPHYSICS AT HIGH ENERGIES (dedicated to 90th anniversary of Ya. ... Astronomy is sensitive now to m (a few)в0.1 eV. based on combined data on LSS and CMBR. ... Right-handed neutrinos - result in stronger bound. ... 10 Massive neutrinos and CMBR Angular spectrum of CMBR does not feel directly presence of light neutrinos - they are practically relativistic at recombination. ...