the comet`s tale - Institute of Astronomy
... Director for 25 years. I think this is enough (perhaps too much), and it is time to start considering a successor, to take up the post at the start of the new BAA year in 2015 October. There is a lot for a Section Director to do, though a new one may choose to delegate many of the tasks, which inclu ...
... Director for 25 years. I think this is enough (perhaps too much), and it is time to start considering a successor, to take up the post at the start of the new BAA year in 2015 October. There is a lot for a Section Director to do, though a new one may choose to delegate many of the tasks, which inclu ...
ROSAT Ian R. Stevens* and David K. Strickland*
... Contini (1998) lists a further eight EL galaxies with narrow He II l4686. Of these only one, Mrk 49, a blue compact dwarf galaxy (also classified as Mrk 1318), has been observed. However, there seems to be emission from a point source near to but not coincident with Mrk 49 (the X-ray emission is cen ...
... Contini (1998) lists a further eight EL galaxies with narrow He II l4686. Of these only one, Mrk 49, a blue compact dwarf galaxy (also classified as Mrk 1318), has been observed. However, there seems to be emission from a point source near to but not coincident with Mrk 49 (the X-ray emission is cen ...
IAA Annual Report 2014
... observatories of Sierra Nevada (Granada) and Calar Alto (Almería), soon IAA scientists proved to be very active adding to that the study of the Earth’s upper atmosphere and, most notably, the pioneering development of space astrophysics in Spain. At present the IAA has four scientific departments wh ...
... observatories of Sierra Nevada (Granada) and Calar Alto (Almería), soon IAA scientists proved to be very active adding to that the study of the Earth’s upper atmosphere and, most notably, the pioneering development of space astrophysics in Spain. At present the IAA has four scientific departments wh ...
united states district court
... the increased refraction of light rays that occurs when rays strike a lens or mirror near its edge, in comparison with those that strike nearer the center. For small telescopes using spherical mirrors with shorter focal ratios, light from a distant point source (such as a star) is not all focused at ...
... the increased refraction of light rays that occurs when rays strike a lens or mirror near its edge, in comparison with those that strike nearer the center. For small telescopes using spherical mirrors with shorter focal ratios, light from a distant point source (such as a star) is not all focused at ...
my dissertation (PhD. Thesis) - Argelander
... like the Sun and eventually to the development of life on Earth. To gain access to information about galaxies one has an enormous amount of objects at hand, galaxies of all sizes and distances ranging from our “backyard”, namely the Milky Way itself and the Local Group to galaxies at a redshift of z ...
... like the Sun and eventually to the development of life on Earth. To gain access to information about galaxies one has an enormous amount of objects at hand, galaxies of all sizes and distances ranging from our “backyard”, namely the Milky Way itself and the Local Group to galaxies at a redshift of z ...
Galaxies - hwchemistry
... it as it is now but as it was millions of years ago—when its light began the ...
... it as it is now but as it was millions of years ago—when its light began the ...
CoRoT III programme
... Because CoRoT is probing effects that were not detectable so far, new types of signal analysis as well as new theoretical tools are being developed. All these data are being interpreted in terms of planetary systems evolution and physical processes in stellar interiors. Most of these results are pub ...
... Because CoRoT is probing effects that were not detectable so far, new types of signal analysis as well as new theoretical tools are being developed. All these data are being interpreted in terms of planetary systems evolution and physical processes in stellar interiors. Most of these results are pub ...
2. The X-ray-Radio correlation for bulgeless galaxies
... Fig. 20: The bulgeless galaxies detected in the X-ray band by the C-COSMOS survey. The continuous line represents the luminosity detection limit for the survey in respect to the redshift. The dashed line represents the limit above which galaxies are considered AGN................................... ...
... Fig. 20: The bulgeless galaxies detected in the X-ray band by the C-COSMOS survey. The continuous line represents the luminosity detection limit for the survey in respect to the redshift. The dashed line represents the limit above which galaxies are considered AGN................................... ...
environmental effects on galaxy evolution in nearby clusters
... This work represents the end point of my student career. After approximately twenty one years from my first entrance in a class room (it was September 1984 in Phoenix, AZ), I’m finally going to attend my last ”school” examination. Therefore I want to seize this opportunity in order to briefly rememb ...
... This work represents the end point of my student career. After approximately twenty one years from my first entrance in a class room (it was September 1984 in Phoenix, AZ), I’m finally going to attend my last ”school” examination. Therefore I want to seize this opportunity in order to briefly rememb ...
Absolute Flux Calibration
... - They are quite compact (hence better for extended configurations and/or higher frequencies than planets) and still sufficiently bright (>500mJy@3mm) ...
... - They are quite compact (hence better for extended configurations and/or higher frequencies than planets) and still sufficiently bright (>500mJy@3mm) ...
The Pupil mapping Exoplanet Coronagraphic Observer
... bandpass with predicted PIAA performance in the PECO observatory (1.4-m aperture). Photon noise and 16 electrons total detector noise (for an electron-multiplying CCD) have been added. This and other RV planets are very easy detections for PECO even in the presence of significant exozodiacal dust, d ...
... bandpass with predicted PIAA performance in the PECO observatory (1.4-m aperture). Photon noise and 16 electrons total detector noise (for an electron-multiplying CCD) have been added. This and other RV planets are very easy detections for PECO even in the presence of significant exozodiacal dust, d ...
Supernova - Wikipedia, the free encyclopedia
... Supernovae in other galaxies cannot be predicted with any meaningful accuracy. Normally, when they are discovered, they are already in progress.[25] Most scientific interest in supernovae—as standard candles for measuring distance, for example—require an observation of their peak luminosity. It is t ...
... Supernovae in other galaxies cannot be predicted with any meaningful accuracy. Normally, when they are discovered, they are already in progress.[25] Most scientific interest in supernovae—as standard candles for measuring distance, for example—require an observation of their peak luminosity. It is t ...
365 days of SKYWATCHING
... are almost invariably low quality and for about the same amount of money you can end up with a fine telescope capable of years of use. The refracting telescope is favored by those who enjoy high power views of terrestrial subjects, as well as the Moon and planets - and provides suitable light gatheri ...
... are almost invariably low quality and for about the same amount of money you can end up with a fine telescope capable of years of use. The refracting telescope is favored by those who enjoy high power views of terrestrial subjects, as well as the Moon and planets - and provides suitable light gatheri ...
NCS 30m Presentation
... Fast OTF as standard data acquistion mode DA continues “between” subscans and scans Independent data streams from subsystems Synchronization via “time stamps” Data files organized by: o Header. XML o Trace. FITS (formerly “DAPs” and backend dumps) o Trailer. XML Systematic naming & organ ...
... Fast OTF as standard data acquistion mode DA continues “between” subscans and scans Independent data streams from subsystems Synchronization via “time stamps” Data files organized by: o Header. XML o Trace. FITS (formerly “DAPs” and backend dumps) o Trailer. XML Systematic naming & organ ...
SkyWatcher2017.5 1.3 Mb - Boise Astronomical Society
... luminosity distance of DL = 749 mega-parsecs may be calculated from z. It is also one of the most luminous quasars known, with an absolute magnitude of −26.7, meaning that if it were only as distant as Pollux it would appear nearly as bright in the sky as the Sun. Since the sun's absolute magnitude ...
... luminosity distance of DL = 749 mega-parsecs may be calculated from z. It is also one of the most luminous quasars known, with an absolute magnitude of −26.7, meaning that if it were only as distant as Pollux it would appear nearly as bright in the sky as the Sun. Since the sun's absolute magnitude ...
Europium, Samarium, and Neodymium Isotopic Fractions in Metal
... where the lines of interest are concentrated, (2) absorption lines of all species will exhibit greater line depth in giants than in dwarfs because of the decrease in the continuous opacity with decreasing electron pressure in giants, and (3) at a given metallicity, molecular formation will be less i ...
... where the lines of interest are concentrated, (2) absorption lines of all species will exhibit greater line depth in giants than in dwarfs because of the decrease in the continuous opacity with decreasing electron pressure in giants, and (3) at a given metallicity, molecular formation will be less i ...
Picturing Objects in the Making: Scheiner, Galileo and the Discovery
... - . ofnerrandstars "Yz Thecrucial difference was that while there was no explicit theological or philosophical veto against the possibility of satellites orbiting Jupiter, in the case of the lunar surface Galileo had to confront the authoritative Aristotelian assertion of the incorruptibility of the ...
... - . ofnerrandstars "Yz Thecrucial difference was that while there was no explicit theological or philosophical veto against the possibility of satellites orbiting Jupiter, in the case of the lunar surface Galileo had to confront the authoritative Aristotelian assertion of the incorruptibility of the ...
THE STAR FORMATION AND NUCLEAR ACCRETION HISTORIES OF NORMAL GALAXIES
... preparation). The XBoötes survey (Murray et al. 2005) obtained a 5 ks Chandra mosaic of the entire 9.3 deg2 field based on 126 ACIS-I pointings. These data are too shallow, however, to detect typical galaxies even at modest redshifts. Fortunately, the wide area of the survey allows us to measure th ...
... preparation). The XBoötes survey (Murray et al. 2005) obtained a 5 ks Chandra mosaic of the entire 9.3 deg2 field based on 126 ACIS-I pointings. These data are too shallow, however, to detect typical galaxies even at modest redshifts. Fortunately, the wide area of the survey allows us to measure th ...
Preliminary Talk Abstract Book - MoCA
... Clusters of galaxies are the most massive virialised cosmic structures. The diversity of their environmental conditions, from the dense cores to the sparse outskirts, allows them to be used as observational laboratories for the study of the environmental drivers of galaxy evolution. Furthermore, the ...
... Clusters of galaxies are the most massive virialised cosmic structures. The diversity of their environmental conditions, from the dense cores to the sparse outskirts, allows them to be used as observational laboratories for the study of the environmental drivers of galaxy evolution. Furthermore, the ...
Understanding Variable Stars - Central Florida Astronomical Society
... 6.34 Variable red giants in the Large Magellanic Cloud, plotted in an apparent K magnitude versus log(period) graph 209 6.35 The 1978--2004 light curve of Mira, based on visual measurements from the AAVSO International Database 210 6.36 The spectra of four pulsating red giants 213 6.37 Radius versus ...
... 6.34 Variable red giants in the Large Magellanic Cloud, plotted in an apparent K magnitude versus log(period) graph 209 6.35 The 1978--2004 light curve of Mira, based on visual measurements from the AAVSO International Database 210 6.36 The spectra of four pulsating red giants 213 6.37 Radius versus ...
Abstract The Star Formation History of Low Surface Brightness Galaxies
... young mean age, less dust, a lower metallicity, perhaps even a variable IMF. Distinguishing between these scenarios requires sufficient information to build stellar population synthesis models which, if not unique, at least exclude certain possibilities. The total stellar mass (M∗ ) of a galaxy is m ...
... young mean age, less dust, a lower metallicity, perhaps even a variable IMF. Distinguishing between these scenarios requires sufficient information to build stellar population synthesis models which, if not unique, at least exclude certain possibilities. The total stellar mass (M∗ ) of a galaxy is m ...
X-ray astronomy of stellar coronae (Review)
... Although often narrowed down to some specific energy ranges, coronal emission is intrinsically a multi-wavelength phenomenon revealing itself from the meter-wave radio range to gamma rays. The most important wavelength regions from which we have learned diagnostically on stellar coronae include the ...
... Although often narrowed down to some specific energy ranges, coronal emission is intrinsically a multi-wavelength phenomenon revealing itself from the meter-wave radio range to gamma rays. The most important wavelength regions from which we have learned diagnostically on stellar coronae include the ...
A Universal Stellar Initial Mass Function? A Critical Look Further
... inferring a stellar population’s IMF from its measured PDMF and adopted SFH. It is somewhat disconcerting that the break from the Salpeter law identified in many IMF studies needs to be invoked near the place where the correction becomes important (around 1 M% ). Knowledge of the SFH of the Galaxy i ...
... inferring a stellar population’s IMF from its measured PDMF and adopted SFH. It is somewhat disconcerting that the break from the Salpeter law identified in many IMF studies needs to be invoked near the place where the correction becomes important (around 1 M% ). Knowledge of the SFH of the Galaxy i ...
Differential rotation in Sun-like stars from surface variability and
... Stellar winds: Stars like the Sun exhibit a stellar wind which consists of charged particles that are thermally and centrifugally liberated from their coronae (Parker 1958). These particles are initially locked to the magnetic field lines out to a radius where the field strength becomes less than th ...
... Stellar winds: Stars like the Sun exhibit a stellar wind which consists of charged particles that are thermally and centrifugally liberated from their coronae (Parker 1958). These particles are initially locked to the magnetic field lines out to a radius where the field strength becomes less than th ...
Elliptical Galaxies
... where Re , the effective radius, is the radius that contains half the total light of the galaxy and Ie is the surface brightness (the amount of light from a square arc second of the galaxy) at Re . This law can be integrated to give a finite total light of Itot = 7.22πRe 2 Ie . de Vaucouleurs’ law, ...
... where Re , the effective radius, is the radius that contains half the total light of the galaxy and Ie is the surface brightness (the amount of light from a square arc second of the galaxy) at Re . This law can be integrated to give a finite total light of Itot = 7.22πRe 2 Ie . de Vaucouleurs’ law, ...
International Ultraviolet Explorer
The International Ultraviolet Explorer (IUE) was an astronomical observatory satellite primarily designed to take ultraviolet spectra. The satellite was a collaborative project between NASA, the UK Science Research Council and the European Space Agency (ESA). The mission was first proposed in early 1964, by a group of scientists in the United Kingdom, and was launched on January 26, 1978 aboard a NASA Delta rocket. The mission lifetime was initially set for 3 years, but in the end it lasted almost 18 years, with the satellite being shut down in 1996. The switch-off occurred for financial reasons, while the telescope was still functioning at near original efficiency.It was the first space observatory to be operated in real time by astronomers who visited the groundstations in the United States and Europe. Astronomers made over 104,000 observations using the IUE, of objects ranging from solar system bodies to distant quasars. Among the significant scientific results from IUE data were the first large scale studies of stellar winds, accurate measurements of the way interstellar dust absorbs light, and measurements of the supernova SN1987A which showed that it defied stellar evolution theories as they then stood. When the mission ended, it was considered the most successful astronomical satellite ever.