2. The X-ray-Radio correlation for bulgeless galaxies
... The study of integrated light measurements in both the X-ray and Radio bands in galaxies allows for the identification of populations of new stars – and therefore, star formation processes – as well as markers for the presence of Active Galactic Nuclei. Correlations between the X-ray and Radio emiss ...
... The study of integrated light measurements in both the X-ray and Radio bands in galaxies allows for the identification of populations of new stars – and therefore, star formation processes – as well as markers for the presence of Active Galactic Nuclei. Correlations between the X-ray and Radio emiss ...
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 ...
Observational evidence for AGN feedback in early
... activity. Based on the nebular emission-line characteristics we separate between star formation activity, black hole activity, the composite of the two and quiescence. We find that emission is mostly LINER (low ionization nuclear emission line region) like in high-mass galaxies (σ > 200 km s−1 ) and ...
... activity. Based on the nebular emission-line characteristics we separate between star formation activity, black hole activity, the composite of the two and quiescence. We find that emission is mostly LINER (low ionization nuclear emission line region) like in high-mass galaxies (σ > 200 km s−1 ) and ...
The visibility of Lyman Alpha Emitters: constraining reionization
... This work is quite close in spirit to the calculations presented in Dayal et al. (2011) wherein the authors used (a) cosmological hydrodynamic simulations run with GADGET-2 to obtain the physical properties of z ≃ 5.7 galaxies, (b) a dust model that took into account the entire star formation histor ...
... This work is quite close in spirit to the calculations presented in Dayal et al. (2011) wherein the authors used (a) cosmological hydrodynamic simulations run with GADGET-2 to obtain the physical properties of z ≃ 5.7 galaxies, (b) a dust model that took into account the entire star formation histor ...
THE STAR FORMATION AND NUCLEAR ACCRETION HISTORIES OF NORMAL GALAXIES
... dominated by star formation, while that from early-type galaxies is dominated by a combination of hot gas and active galactic nucleus (AGN) emission. We find that the mean star formation and supermassive black hole accretion rate densities evolve like ∼ (1+z)3±1 , in agreement with the trends found ...
... dominated by star formation, while that from early-type galaxies is dominated by a combination of hot gas and active galactic nucleus (AGN) emission. We find that the mean star formation and supermassive black hole accretion rate densities evolve like ∼ (1+z)3±1 , in agreement with the trends found ...
An Atlas of Stellar Spectra
... luminosity classes. It is not possible even to adopt certain criteria as standard, since different criteria may have to be used with different dispersion. In the Atlas some of the most useful features for luminosity classification have been indicated, but it should be emphasized that each dispersion ...
... luminosity classes. It is not possible even to adopt certain criteria as standard, since different criteria may have to be used with different dispersion. In the Atlas some of the most useful features for luminosity classification have been indicated, but it should be emphasized that each dispersion ...
... disk gas into outer rings, inner rings, and central mass concentrations. The resulting star formation produces a central stellar subsystem that has the high density and steep density gradient of a bulge but that was not formed by galaxy mergers. Secular evolution is not confined to barred and oval g ...
Present-day cosmic abundances - Dr. Karl Remeis
... An ideal alternative to find a reference for the chemical composition of cosmic matter are normal unevolved early B-type stars of ∼8-18 M⊙ , which can provide simultaneously temporal (present-day) and local (birth place) information on chemical abundances. They can be observed not only in the solar ...
... An ideal alternative to find a reference for the chemical composition of cosmic matter are normal unevolved early B-type stars of ∼8-18 M⊙ , which can provide simultaneously temporal (present-day) and local (birth place) information on chemical abundances. They can be observed not only in the solar ...
High-mass star-forming cloud G0.38+0.04 in the Galactic center dust
... This high detection rate of masers in star-forming regions within the CMZ, despite limited statistical information, suggests that H2 CO masers may be an efficient tracer of high-mass star formation in extreme environments. By contrast, extensive surveys have shown that the occurrence of H2 CO masers ...
... This high detection rate of masers in star-forming regions within the CMZ, despite limited statistical information, suggests that H2 CO masers may be an efficient tracer of high-mass star formation in extreme environments. By contrast, extensive surveys have shown that the occurrence of H2 CO masers ...
The most metal-poor galaxies
... 1978). It is also during the 70s that the first hierarchical models of galaxy formation were constructed (Press and Schechter 1974). Because dwarf galaxies condense from smaller perturbations than giants, the Cold Dark Matter models (CDM) predict that low mass galaxies could still be forming at the ...
... 1978). It is also during the 70s that the first hierarchical models of galaxy formation were constructed (Press and Schechter 1974). Because dwarf galaxies condense from smaller perturbations than giants, the Cold Dark Matter models (CDM) predict that low mass galaxies could still be forming at the ...
Here - NASA/IPAC Extragalactic Database
... the morphology of H ii regions is generally rather complex on all scales. Typical hydrogen densities n are 103 – 104 cm−3 for compact H ii regions. The average densities in giant extragalactic H ii regions are lower, typically 102 cm−3 since giant H ii regions encompass also zones of diffuse materia ...
... the morphology of H ii regions is generally rather complex on all scales. Typical hydrogen densities n are 103 – 104 cm−3 for compact H ii regions. The average densities in giant extragalactic H ii regions are lower, typically 102 cm−3 since giant H ii regions encompass also zones of diffuse materia ...
Giant star seismology
... Asteroseismology – the study of global properties of stars and their internal structure through their global intrinsic oscillations – is already more than a century old. An early remarkable result was obtained for Cepheids revealing the period-luminosity relation (Leavitt and Pickering, 1912), which ...
... Asteroseismology – the study of global properties of stars and their internal structure through their global intrinsic oscillations – is already more than a century old. An early remarkable result was obtained for Cepheids revealing the period-luminosity relation (Leavitt and Pickering, 1912), which ...
Lichtenknecker- Database of the BAV
... The criteria for an inclusion of eclipsing binaries into the database are a magnitude not fainter than 13mag during maximum light and a declination north of –20 degree. There is no limit regarding the amplitude of the change of light or period. Due to the increasing use of CCD-cameras in the recent ...
... The criteria for an inclusion of eclipsing binaries into the database are a magnitude not fainter than 13mag during maximum light and a declination north of –20 degree. There is no limit regarding the amplitude of the change of light or period. Due to the increasing use of CCD-cameras in the recent ...
A spectroscopic study of detached binary systems using precise radial velocities
... A complete understanding of a binary system’s orbital characteristics, as well as the measurement of the all-important stellar masses, is almost always only achieved after the binary system has been studied using two or more complementary observing techniques. Two of the suitable techniques are astr ...
... A complete understanding of a binary system’s orbital characteristics, as well as the measurement of the all-important stellar masses, is almost always only achieved after the binary system has been studied using two or more complementary observing techniques. Two of the suitable techniques are astr ...
THE UV-OPTICAL COLOR MAGNITUDE DIAGRAM. II. PHYSICAL
... quite clearly how the NUV r color covers a much wider magnitude range than g r. In addition, the g r color starts to saturate for red galaxies, while NUV r varies by more than 2 magnitudes. We see indications from these plots that rest-frame UV-optical colors correlate with Sersic index (and ...
... quite clearly how the NUV r color covers a much wider magnitude range than g r. In addition, the g r color starts to saturate for red galaxies, while NUV r varies by more than 2 magnitudes. We see indications from these plots that rest-frame UV-optical colors correlate with Sersic index (and ...
Earth Centered Universe Pro V6.0
... The Earth Centered Universe (ECU) software is protected by the copyright laws of Canada and the United States of America, as well as by the copyright laws of many other countries pursuant to international treaties. The ECU software and this manual are Copyright © 19922011 by David J. Lane (the owner ...
... The Earth Centered Universe (ECU) software is protected by the copyright laws of Canada and the United States of America, as well as by the copyright laws of many other countries pursuant to international treaties. The ECU software and this manual are Copyright © 19922011 by David J. Lane (the owner ...
Understanding Variable Stars - Central Florida Astronomical Society
... Probing the mysterious heart of the Crab Nebula, the tattered remains of an exploding star, astronomers have found this object to be even more dynamic than previously understood 99 The periods of pulsars, plotted against the rate of period change 101 Schematic picture of a simple eclipsing binary, a ...
... Probing the mysterious heart of the Crab Nebula, the tattered remains of an exploding star, astronomers have found this object to be even more dynamic than previously understood 99 The periods of pulsars, plotted against the rate of period change 101 Schematic picture of a simple eclipsing binary, a ...
Full Text - Departement Natuurkunde en Sterrenkunde
... Strömgren photometric system . . . . . . . . . . . . . . . . . . . . . 165 ...
... Strömgren photometric system . . . . . . . . . . . . . . . . . . . . . 165 ...
A Universal Stellar Initial Mass Function? A Critical Look Further
... The second implicit assumption is required due to finite stellar lifetimes. If one counts stars in a population spanning a large range of ages (as in the disk of the Milky Way), one can only construct the present-day mass function (PDMF). In this example, some fraction of the more massive stars with ...
... The second implicit assumption is required due to finite stellar lifetimes. If one counts stars in a population spanning a large range of ages (as in the disk of the Milky Way), one can only construct the present-day mass function (PDMF). In this example, some fraction of the more massive stars with ...
THE MORPHOLOGICAL DEMOGRAPHICS OF GALAXIES IN THE
... 9803, PI: Thompson). The ACS datasets consist of two separate fields around the center of the UDF arranged in a mosaiced pattern determined by the NICMOS observations of 3000 spacing between pointings (Blakeslee et al. 2004). The resulting coverage of the parallel ACS fields as well as the UDF and N ...
... 9803, PI: Thompson). The ACS datasets consist of two separate fields around the center of the UDF arranged in a mosaiced pattern determined by the NICMOS observations of 3000 spacing between pointings (Blakeslee et al. 2004). The resulting coverage of the parallel ACS fields as well as the UDF and N ...
Rich
... • For 21 LAEs, flux calibrated optical spectroscopy was obtained with measured Hα and Hα fluxes. • 13/21 were obtained with long slit aperture matched spectroscopy at Lick and KPNO. • 8/21 were observed at Keck with 1”.5 long slit spectroscopy. The mean escape fraction for these sources decreases wi ...
... • For 21 LAEs, flux calibrated optical spectroscopy was obtained with measured Hα and Hα fluxes. • 13/21 were obtained with long slit aperture matched spectroscopy at Lick and KPNO. • 8/21 were observed at Keck with 1”.5 long slit spectroscopy. The mean escape fraction for these sources decreases wi ...
The environment of high-redshift AGN OLIMPIA JUDIT FOGASY
... the processes that engineered the tight correlations found between their supermassive black hole (SMBH) mass and bulge mass or velocity dispersion, the study of powerful, high-redshift active galactic nuclei (AGN) and their environment is crucial. As powerful high-z AGN are massive galaxies themselv ...
... the processes that engineered the tight correlations found between their supermassive black hole (SMBH) mass and bulge mass or velocity dispersion, the study of powerful, high-redshift active galactic nuclei (AGN) and their environment is crucial. As powerful high-z AGN are massive galaxies themselv ...
The CCD Photometric Calibration Cookbook
... Cape photographic Dm data about such magnitudes are contained for all the stars south of declination , down to about 9.5, together with a great mass of fainter ones. The difficulty of reducing all these magnitudes to one and the same homogeneous and rational scale has however, not been altogether ov ...
... Cape photographic Dm data about such magnitudes are contained for all the stars south of declination , down to about 9.5, together with a great mass of fainter ones. The difficulty of reducing all these magnitudes to one and the same homogeneous and rational scale has however, not been altogether ov ...
Perseus (constellation)
Perseus, named after the Greek mythological hero Perseus, is a constellation in the northern sky. It was one of 48 listed by the 2nd-century astronomer Ptolemy and among the 88 modern constellations defined by the International Astronomical Union (IAU). It is located in the northern celestial hemisphere near several other constellations named after legends surrounding Perseus, including Andromeda to the west and Cassiopeia to the north. Perseus is also bordered by Aries and Taurus to the south, Auriga to the east, Camelopardalis to the north, and Triangulum to the west.The galactic plane of the Milky Way passes through Perseus but is mostly obscured by molecular clouds. The constellation's brightest star is the yellow-white supergiant Alpha Persei (also called Mirfak), which shines at magnitude 1.79. It and many of the surrounding stars are members of an open cluster known as the Alpha Persei Cluster. The best-known star, however, is Algol (Beta Persei), linked with ominous legends because of its variability, which is noticeable to the naked eye. Rather than being an intrinsically variable star, it is an eclipsing binary. Other notable star systems in Perseus include X Persei, a binary system containing a neutron star, and GK Persei, a nova that peaked at magnitude 0.2 in 1901. The Double Cluster, comprising two open clusters quite near each other in the sky, was known to the ancient Chinese. The constellation gives its name to the Perseus Cluster (Abell 426), a massive galaxy cluster located 250 million light-years from Earth. It hosts the radiant of the annual Perseids meteor shower—one of the most prominent meteor showers in the sky.