The XMM-Newton Bright Serendipitous Survey
... DSS I/II1 and the SDSS2 ). In particular, we have found the optical counterpart of about 88% of the XBS sources on the DSS with a red magnitude (the APM3 red magnitude) brighter than ∼20.5. All but 6 of the remaining sources have been optically identified either through dedicated photometry or using ...
... DSS I/II1 and the SDSS2 ). In particular, we have found the optical counterpart of about 88% of the XBS sources on the DSS with a red magnitude (the APM3 red magnitude) brighter than ∼20.5. All but 6 of the remaining sources have been optically identified either through dedicated photometry or using ...
The correlation between galaxy morphology and star
... and COSMOS) using both WFC3 and ACS. The whole project is organized as a two–tier Deep+Wide survey. The CANDELS/Deep survey covers about 125 square arc minutes to ∼ 10-orbit depth within GOODS-North and -South (Giavalisco et al. 2004) at F105W(Y), F125W(J) and F160W(H), while the Wide survey covers ...
... and COSMOS) using both WFC3 and ACS. The whole project is organized as a two–tier Deep+Wide survey. The CANDELS/Deep survey covers about 125 square arc minutes to ∼ 10-orbit depth within GOODS-North and -South (Giavalisco et al. 2004) at F105W(Y), F125W(J) and F160W(H), while the Wide survey covers ...
Galaxies - hwchemistry
... – Studies of nearby globular clusters with known distances show that they are about 25 pc in diameter. – If astronomers can detect globular clusters in a distant galaxy, they can assume the clusters are about 25 pc in diameter and use the small-angle formula to find the distance to the galaxy. ...
... – Studies of nearby globular clusters with known distances show that they are about 25 pc in diameter. – If astronomers can detect globular clusters in a distant galaxy, they can assume the clusters are about 25 pc in diameter and use the small-angle formula to find the distance to the galaxy. ...
Picturing Objects in the Making: Scheiner, Galileo and the Discovery
... The inaccuracy of Galileo's pictures, however, was of a specific kind. Like the diagrams of the positions of the satellites of Jupiter, the pictures of the lunar surface worked as a sequence (albeit a short one). They did show that the changing patterns of bright and dark areas cast by the topograph ...
... The inaccuracy of Galileo's pictures, however, was of a specific kind. Like the diagrams of the positions of the satellites of Jupiter, the pictures of the lunar surface worked as a sequence (albeit a short one). They did show that the changing patterns of bright and dark areas cast by the topograph ...
IAA Annual Report 2014
... Universe, discover an extended nebular HeII4686emitting region. The observations, in conjunction with state-of-the-art stellar model predictions, reveal that only (nearly) metal-free ionizing stars, similar to PopIII stars, the first ones that ever shone in the Universe, can explain the HeII ionizat ...
... Universe, discover an extended nebular HeII4686emitting region. The observations, in conjunction with state-of-the-art stellar model predictions, reveal that only (nearly) metal-free ionizing stars, similar to PopIII stars, the first ones that ever shone in the Universe, can explain the HeII ionizat ...
Elliptical Galaxies
... have a short axis about 65% of the length of the long axis with a dispersion of about 15%. This picture remained current until the late 1970s but has been dramatically revised since then. In recent years attempts to produce a physical classification for ellipticals, and new ways of estimating their ...
... have a short axis about 65% of the length of the long axis with a dispersion of about 15%. This picture remained current until the late 1970s but has been dramatically revised since then. In recent years attempts to produce a physical classification for ellipticals, and new ways of estimating their ...
The VIMOS Ultra-Deep Survey (VUDS): Fast Increase in the Fraction
... in the local Universe. Hayes et al. (2014) and Atek et al. (2014) have found that Lyα photons escape more easily from galaxies with low dust content. At high redshift, although on samples that are much smaller than the one we use in this paper, a similar trend has been found by Kornei et al. (2010) ...
... in the local Universe. Hayes et al. (2014) and Atek et al. (2014) have found that Lyα photons escape more easily from galaxies with low dust content. At high redshift, although on samples that are much smaller than the one we use in this paper, a similar trend has been found by Kornei et al. (2010) ...
X-Ray Spectroscopy of Stars
... Stars are among the most prominent sources accessible to modern X-ray telescopes. In fact, stars located across almost all regions of a Hertzsprung-Russell diagram have been identified as X-ray sources, with only a few exceptions, most notably A-type stars and the coolest giants of spectral type M. ...
... Stars are among the most prominent sources accessible to modern X-ray telescopes. In fact, stars located across almost all regions of a Hertzsprung-Russell diagram have been identified as X-ray sources, with only a few exceptions, most notably A-type stars and the coolest giants of spectral type M. ...
Lecture 2
... • They targeted QSO fields in order to study known peaks in the matter distribution at high redshift Current Topics: Lyman Break Galaxies - Lecture 2 ...
... • They targeted QSO fields in order to study known peaks in the matter distribution at high redshift Current Topics: Lyman Break Galaxies - Lecture 2 ...
Revising the census of low luminosity AGN
... WHY AN AGN CENSUS? • A PROPER AGN CENSUS IS NEEDED FOR A VARIETY OF STUDIES, SUCH AS, E.G. , THE AGN/HOST GALAXY CONNECTION, THE PROPERTIES OF THE CENTRAL ENGINE, THE AGN LUMINOSITY FUNCTION … • THE CENSUS SHOULD BE COMPLETE (OR AT LEAST WITH WELL DEFINED BIASES) AND INCLUDE THE LEAST NUMBER OF INT ...
... WHY AN AGN CENSUS? • A PROPER AGN CENSUS IS NEEDED FOR A VARIETY OF STUDIES, SUCH AS, E.G. , THE AGN/HOST GALAXY CONNECTION, THE PROPERTIES OF THE CENTRAL ENGINE, THE AGN LUMINOSITY FUNCTION … • THE CENSUS SHOULD BE COMPLETE (OR AT LEAST WITH WELL DEFINED BIASES) AND INCLUDE THE LEAST NUMBER OF INT ...
The environment of high-redshift AGN OLIMPIA JUDIT FOGASY
... In order to understand the formation and evolution of local massive galaxies and to reveal 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 ( ...
... In order to understand the formation and evolution of local massive galaxies and to reveal 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 ( ...
W.M. Keck Observatory Annual Report 2009
... Supernovae are stellar explosions that can outshine an entire galaxy, such as the Milky Way, for a brief interval. As such, they are bright beacons that can be observed at very great distances from Earth. Astronomers have yet again rewritten the record books for discovering the most distant supernov ...
... Supernovae are stellar explosions that can outshine an entire galaxy, such as the Milky Way, for a brief interval. As such, they are bright beacons that can be observed at very great distances from Earth. Astronomers have yet again rewritten the record books for discovering the most distant supernov ...
Probing nuclear activity versus star formation at z ∼ 0.8 using near
... this is the largest compilation of NIR spectra of active galactic nuclei (AGN) at this redshift. The data were obtained using the multi-object spectroscopic mode of the Long-slit Intermediate Resolution Infrared Spectrograph (LIRIS) at the 4.2 m William Herschel Telescope (WHT). These galaxies are r ...
... this is the largest compilation of NIR spectra of active galactic nuclei (AGN) at this redshift. The data were obtained using the multi-object spectroscopic mode of the Long-slit Intermediate Resolution Infrared Spectrograph (LIRIS) at the 4.2 m William Herschel Telescope (WHT). These galaxies are r ...
c Copyright by Jonathan C. McKinney, 2004
... Accretion onto a black hole is the most efficient known process to convert gravitational energy into radiation. Some gamma-ray bursts (GRBs), some X-ray binaries, and all active galactic nuclei (AGN) are likely powered by accretion onto a rotating black hole. I model the global, timedependent accret ...
... Accretion onto a black hole is the most efficient known process to convert gravitational energy into radiation. Some gamma-ray bursts (GRBs), some X-ray binaries, and all active galactic nuclei (AGN) are likely powered by accretion onto a rotating black hole. I model the global, timedependent accret ...
Chapter 24
... Irregular galaxies tend to be smaller than spirals, but somewhat larger than dwarf ellipticals. They typically contain between 108 and 1010 stars. The smallest such galaxies are called dwarf irregulars. As with elliptical galaxies, the dwarf type is the most common irregular. Dwarf ellipticals and d ...
... Irregular galaxies tend to be smaller than spirals, but somewhat larger than dwarf ellipticals. They typically contain between 108 and 1010 stars. The smallest such galaxies are called dwarf irregulars. As with elliptical galaxies, the dwarf type is the most common irregular. Dwarf ellipticals and d ...
lecture course
... undergoing nuclear fusion and releasing energy in the form of (mostly visible) electromagnetic waves. They have masses typically 0.1 to 100 times the mass of the sun, and have a blackbody spectrum that peaks at longer wavelengths for lower mass stars (it peaks at about 500 nm for the Sun). The evolu ...
... undergoing nuclear fusion and releasing energy in the form of (mostly visible) electromagnetic waves. They have masses typically 0.1 to 100 times the mass of the sun, and have a blackbody spectrum that peaks at longer wavelengths for lower mass stars (it peaks at about 500 nm for the Sun). The evolu ...
High-mass star-forming cloud G0.38+0.04 in the Galactic center dust
... H2 CO maser in position to well within the statistical fit errors, much less than the absolute positional uncertainty (<0.100 ). There is a water maser within 1 km s−1 of the H2 CO line, and the brightest water maser is separated by only 4 km s−1 , so these may arise from the same region; these H2 O ...
... H2 CO maser in position to well within the statistical fit errors, much less than the absolute positional uncertainty (<0.100 ). There is a water maser within 1 km s−1 of the H2 CO line, and the brightest water maser is separated by only 4 km s−1 , so these may arise from the same region; these H2 O ...
The Milky Way - The Independent School
... Compare to apparent magnitude Find its distance b) Type Ia Supernovae (collapse of an accreting white dwarf in a binary system): Type Ia Supernovae have well known standard luminosities Compare to apparent magnitudes Find its distances Both are “Standard-candle” methods: Know absolute magnitud ...
... Compare to apparent magnitude Find its distance b) Type Ia Supernovae (collapse of an accreting white dwarf in a binary system): Type Ia Supernovae have well known standard luminosities Compare to apparent magnitudes Find its distances Both are “Standard-candle” methods: Know absolute magnitud ...
An X-Ray, Optical and Infra-red study of High-Mass X
... is continually growing and is now a similar size to that of the Milky Way, despite a significant mass difference between the two galaxies. In this thesis, I present multi-wavelength observations of Be/X-ray binaries that have undergone an outburst during the past three years, including the discovery ...
... is continually growing and is now a similar size to that of the Milky Way, despite a significant mass difference between the two galaxies. In this thesis, I present multi-wavelength observations of Be/X-ray binaries that have undergone an outburst during the past three years, including the discovery ...
THE MORPHOLOGICAL DEMOGRAPHICS OF GALAXIES IN THE
... at 1600Å and compute their rest-frame F1600 flux. The TB – types provided by BPZ are a linear combination from a template library of SEDs. We use the CWWSB_Benitez2003 template set as described in Benítez et al. (2004). These are based on the templates from Coleman, Wu, & Weedman (1980) and Kinney e ...
... at 1600Å and compute their rest-frame F1600 flux. The TB – types provided by BPZ are a linear combination from a template library of SEDs. We use the CWWSB_Benitez2003 template set as described in Benítez et al. (2004). These are based on the templates from Coleman, Wu, & Weedman (1980) and Kinney e ...
ROSAT Ian R. Stevens* and David K. Strickland*
... WR galaxies are a subset of emission-line (EL) galaxies. Conti (1991) listed a small number of examples of related EL galaxies, namely those with narrow-line He II l4686 emission (as compared to broad emission for WR galaxies) and those with no He II l4686 emission. The origin of narrow He II l4686 ...
... WR galaxies are a subset of emission-line (EL) galaxies. Conti (1991) listed a small number of examples of related EL galaxies, namely those with narrow-line He II l4686 emission (as compared to broad emission for WR galaxies) and those with no He II l4686 emission. The origin of narrow He II l4686 ...
probing quasar environments with tunable filter
... formation in the universe and the impact of active galaxies on their environment. The Taurus Tunable Filter (TTF) on the Anglo-Australian Telescope provides a powerful and flexible method of performing surveys for line-emitting objects, enabling nearmonochromatic imaging over a narrow bandpass at wa ...
... formation in the universe and the impact of active galaxies on their environment. The Taurus Tunable Filter (TTF) on the Anglo-Australian Telescope provides a powerful and flexible method of performing surveys for line-emitting objects, enabling nearmonochromatic imaging over a narrow bandpass at wa ...
X-Ray Properties of Young Stars and Stellar Clusters
... blue optical/UV continuum, and, in the Sun, high γ-ray and energetic particle fluences. These particles impact the stellar surface at the magnetic footprints, immediately heating gas that flows upward to fill coronal loops with X-ray emitting plasma. It is this “gradual phase” of the flare that is s ...
... blue optical/UV continuum, and, in the Sun, high γ-ray and energetic particle fluences. These particles impact the stellar surface at the magnetic footprints, immediately heating gas that flows upward to fill coronal loops with X-ray emitting plasma. It is this “gradual phase” of the flare that is s ...