Chap 16: Galaxies
... Starburst galaxies contain many young stars and recent supernovae, and are often very rich in gas and dust; bright in infrared: ultraluminous infrared galaxies ...
... Starburst galaxies contain many young stars and recent supernovae, and are often very rich in gas and dust; bright in infrared: ultraluminous infrared galaxies ...
AR2012 - Vatican Observatory
... from Star Cluster Ecology to Tracers of Galaxy Evolution. In 1985, the late Fr. Martin McCarthy S.J., an astronomer at the Observatory, recognized that there was too little contact between the astronomers at the Observatory and younger researchers. His solution was to open the observatory to student ...
... from Star Cluster Ecology to Tracers of Galaxy Evolution. In 1985, the late Fr. Martin McCarthy S.J., an astronomer at the Observatory, recognized that there was too little contact between the astronomers at the Observatory and younger researchers. His solution was to open the observatory to student ...
MPhil Thesis - Final - Suzanne Knight
... Theoretical predictions generally agree that a star will consume and destroy close-in, low mass planets as it ascends the red giant and asymptotic giant branch evolutionary tracks, but larger mass objects and those further out will survive.! A substellar companion detected around a white dwarf would ...
... Theoretical predictions generally agree that a star will consume and destroy close-in, low mass planets as it ascends the red giant and asymptotic giant branch evolutionary tracks, but larger mass objects and those further out will survive.! A substellar companion detected around a white dwarf would ...
IXO as an observatory in the large telescopes era
... accretion light from moderate luminosity AGN at z=6-11, which are rendered invisible in other wavebands due to intergalactic absorption and dilution by their host galaxy. Testing the various competing scenarios for the evolution of early SMBH will be rendered possible by IXO, which will reveal the A ...
... accretion light from moderate luminosity AGN at z=6-11, which are rendered invisible in other wavebands due to intergalactic absorption and dilution by their host galaxy. Testing the various competing scenarios for the evolution of early SMBH will be rendered possible by IXO, which will reveal the A ...
Multiwavelength observations of XTE J1118+480`s outburst
... 30% of sources detected by INTEGRAL/IBIS were not known. 80% of Norma sources are X-ray pulsars, high spin periods Spectra typical of neutron stars No radio emission 85% of sources are highly absorbed (X-ray observations): column density NH>1023 cm-2 X-ray absorption >> IR => absorbing matter local ...
... 30% of sources detected by INTEGRAL/IBIS were not known. 80% of Norma sources are X-ray pulsars, high spin periods Spectra typical of neutron stars No radio emission 85% of sources are highly absorbed (X-ray observations): column density NH>1023 cm-2 X-ray absorption >> IR => absorbing matter local ...
Clusters as laboratories for the study of galaxy evolution
... merging, it took place at higher redshifts (z >> 1 ) than is predicted by current semianalytical models.” p.s. van Dokkum and Stanford, 2003 ApJ, 585, 78, have measured velocity “…bright endfor of the was already in dispersions 3 ofLF the bright galaxies in this cluster, which confirm the large mass ...
... merging, it took place at higher redshifts (z >> 1 ) than is predicted by current semianalytical models.” p.s. van Dokkum and Stanford, 2003 ApJ, 585, 78, have measured velocity “…bright endfor of the was already in dispersions 3 ofLF the bright galaxies in this cluster, which confirm the large mass ...
Altas Farnese
... Aratus stated the summer solstice to be at the start of Leo, whereas the statue shows it to be near the head of Pollux with the entire constellation of Cancer between. (2) The human part of the Centaur is said to be under Scorpius, whereas the statue places it under Virgo, with the entire constellat ...
... Aratus stated the summer solstice to be at the start of Leo, whereas the statue shows it to be near the head of Pollux with the entire constellation of Cancer between. (2) The human part of the Centaur is said to be under Scorpius, whereas the statue places it under Virgo, with the entire constellat ...
The physics and modes of star cluster formation: observations
... is considerably more difficult, especially for intrinsically faint members whose numbers are only comparable to or significantly lower than those of the background/foreground stellar field population. The size of the cluster’s membership can be determined statistically through comparison with the backg ...
... is considerably more difficult, especially for intrinsically faint members whose numbers are only comparable to or significantly lower than those of the background/foreground stellar field population. The size of the cluster’s membership can be determined statistically through comparison with the backg ...
The science case for - Astrophysics
... dominated by poorly understood dark matter and a mysterious vacuum energy density. This progress poses new, and more fundamental, questions, the answers to some of which will perhaps unite astrophysics with elementary particle physics in a new approach to the nature of matter. Some discoveries, made ...
... dominated by poorly understood dark matter and a mysterious vacuum energy density. This progress poses new, and more fundamental, questions, the answers to some of which will perhaps unite astrophysics with elementary particle physics in a new approach to the nature of matter. Some discoveries, made ...
On the nature of sn stars. I. A detailed abundance study
... is also a low projected rotational velocity: 12 out of 16 have vsini < 50 km/s and all have vsini < 100 km/s. The coexistence of the sn characteristics with chemical peculiarities and the slow rotation, favours a relationship with Bp stars. Although most of the stars that present the sn characterist ...
... is also a low projected rotational velocity: 12 out of 16 have vsini < 50 km/s and all have vsini < 100 km/s. The coexistence of the sn characteristics with chemical peculiarities and the slow rotation, favours a relationship with Bp stars. Although most of the stars that present the sn characterist ...
The Milky Way as a galaxy
... This method yields accurate distance estimates of star clusters within 200 pc. The accuracy depends on the measurability of the proper motions. Furthermore, the cluster should cover a sufficiently large area on the sky for the convergence point to be well defined. For the distance estimate, one ca ...
... This method yields accurate distance estimates of star clusters within 200 pc. The accuracy depends on the measurability of the proper motions. Furthermore, the cluster should cover a sufficiently large area on the sky for the convergence point to be well defined. For the distance estimate, one ca ...
21 -26 August University of Exeter
... (H2), which can only be traced indirectly in observations, mostly by means of CO line and dust extinction measurements. Since they are observed to host large non-thermal line widths, the cloud sub-structure seems to be shaped by supersonic turbulence. The crux, however, is that supersonic turbulence ...
... (H2), which can only be traced indirectly in observations, mostly by means of CO line and dust extinction measurements. Since they are observed to host large non-thermal line widths, the cloud sub-structure seems to be shaped by supersonic turbulence. The crux, however, is that supersonic turbulence ...
The physics of star formation
... example in spiral arms. On the intermediate scales of star-forming ‘giant molecular clouds’ (GMCs), turbulence and magnetic fields may be the most important effects counteracting gravity, and star formation may involve the dissipation of turbulence and magnetic fields. On the small scales of individ ...
... example in spiral arms. On the intermediate scales of star-forming ‘giant molecular clouds’ (GMCs), turbulence and magnetic fields may be the most important effects counteracting gravity, and star formation may involve the dissipation of turbulence and magnetic fields. On the small scales of individ ...
The physics of star formation - Yale Astronomy
... example in spiral arms. On the intermediate scales of star-forming ‘giant molecular clouds’ (GMCs), turbulence and magnetic fields may be the most important effects counteracting gravity, and star formation may involve the dissipation of turbulence and magnetic fields. On the small scales of individ ...
... example in spiral arms. On the intermediate scales of star-forming ‘giant molecular clouds’ (GMCs), turbulence and magnetic fields may be the most important effects counteracting gravity, and star formation may involve the dissipation of turbulence and magnetic fields. On the small scales of individ ...
Carbon-enhanced metal-poor stars in dwarf galaxies
... stars in Local Group dwarf galaxies by means of a statistical, data-calibrated cosmological model for the hierarchical build-up of the Milky Way and its dwarf satellites. The model self-consistently explains the variation with dwarf galaxy luminosity of the observed: i) frequency and [Fe/H] range of ...
... stars in Local Group dwarf galaxies by means of a statistical, data-calibrated cosmological model for the hierarchical build-up of the Milky Way and its dwarf satellites. The model self-consistently explains the variation with dwarf galaxy luminosity of the observed: i) frequency and [Fe/H] range of ...
1998 - Universitäts-Sternwarte München
... stellar wind of giant stars, the occurrence of planetary nebulae, or the very spectacular supernova events. Nowadays, it is therefore no surprise that the ancient stars of the Galactic halo are found to be metal-poor objects – as opposed to the understanding when they were first analyzed in the 1950 ...
... stellar wind of giant stars, the occurrence of planetary nebulae, or the very spectacular supernova events. Nowadays, it is therefore no surprise that the ancient stars of the Galactic halo are found to be metal-poor objects – as opposed to the understanding when they were first analyzed in the 1950 ...
Spectral Matching for Elemental Abundances of Evolved Stars of Globular Clusters
... used to estimate the oxygen abundance of the stars, leading to a determination of whether a particular star was oxygen-rich or oxygen-poor. From this a catalogue of abundances of iron, carbon and barium of 848 giant branch stars were determined, of which 557 also had well-defined nitrogen abundances ...
... used to estimate the oxygen abundance of the stars, leading to a determination of whether a particular star was oxygen-rich or oxygen-poor. From this a catalogue of abundances of iron, carbon and barium of 848 giant branch stars were determined, of which 557 also had well-defined nitrogen abundances ...
Element Segregation in Low Metallicity Stars and the Primordial
... This prediction is in contradiction with the observations of the lithium plateau in Pop II stars. However, as discussed above, the lithium profiles in the standard models present a maximum (Limax ) which remains remarkably constant (within 10 %)and stable from star to star. This result leads to the ...
... This prediction is in contradiction with the observations of the lithium plateau in Pop II stars. However, as discussed above, the lithium profiles in the standard models present a maximum (Limax ) which remains remarkably constant (within 10 %)and stable from star to star. This result leads to the ...
Starburst Galaxies - Beck-Shop
... by the arms. The reason why the arms stand out so sharply from the rest of the disk is that they contain numerous star-forming regions. In those regions the massive hot young stars are extremely bright and outshine the far more numerous less massive stars. Few starforming regions are to be found in ...
... by the arms. The reason why the arms stand out so sharply from the rest of the disk is that they contain numerous star-forming regions. In those regions the massive hot young stars are extremely bright and outshine the far more numerous less massive stars. Few starforming regions are to be found in ...
Hunting for Substructure in the Milky Way
... In previous years, astronomers had a simple outlook on the structure of our Galaxy, which has evolved over time with ongoing research in the area. At its most basic level, the Milky Way is a barred disk galaxy with spiral arms. Its main components are the central bulge, the disk and the surrounding ...
... In previous years, astronomers had a simple outlook on the structure of our Galaxy, which has evolved over time with ongoing research in the area. At its most basic level, the Milky Way is a barred disk galaxy with spiral arms. Its main components are the central bulge, the disk and the surrounding ...
Cygnus (constellation)
Cygnus /ˈsɪɡnəs/ is a northern constellation lying on the plane of the Milky Way, deriving its name from the Latinized Greek word for swan. The swan is one of the most recognizable constellations of the northern summer and autumn, it features a prominent asterism known as the Northern Cross (in contrast to the Southern Cross). Cygnus was among the 48 constellations listed by the 2nd century astronomer Ptolemy, and it remains one of the 88 modern constellations.Cygnus contains Deneb, one of the brightest stars in the night sky and one corner of the Summer Triangle, as well as some notable X-ray sources and the giant stellar association of Cygnus OB2. One of the stars of this association, NML Cygni, is one of the largest stars currently known. The constellation is also home to Cygnus X-1, a distant X-ray binary containing a supergiant and unseen massive companion that was the first object widely held to be a black hole. Many star systems in Cygnus have known planets as a result of the Kepler Mission observing one patch of the sky, the patch is the area around Cygnus. In addition, most of the eastern part of Cygnus is dominated by the Hercules–Corona Borealis Great Wall, a giant galaxy filament that is the largest known structure in the observable universe; covering most of the northern sky.