The XMM-Newton Bright Serendipitous Survey
... sources is relatively easy given the combination of the good positions of the XMM-Newton sources (90% error ∼400 , Della Ceca et al. 2004) and the brightness of the sources: X-ray sources with FX >10−13 erg cm−2 s−1 are expected to have an optical counterpart brighter than 22 mag for X-ray-to-optica ...
... sources is relatively easy given the combination of the good positions of the XMM-Newton sources (90% error ∼400 , Della Ceca et al. 2004) and the brightness of the sources: X-ray sources with FX >10−13 erg cm−2 s−1 are expected to have an optical counterpart brighter than 22 mag for X-ray-to-optica ...
the comet`s tale - Institute of Astronomy
... RGB: 1x2mins. Today’s images of bright binocular comets rival drawings of Great Comets of the nineteenth century. Rather predictably the expected comet of the century failed to materialise, however several of the other comets mentioned in the last issue, together with the additional surprise shown a ...
... RGB: 1x2mins. Today’s images of bright binocular comets rival drawings of Great Comets of the nineteenth century. Rather predictably the expected comet of the century failed to materialise, however several of the other comets mentioned in the last issue, together with the additional surprise shown a ...
Niraj D. Welikala Thesis - D-Scholarship@Pitt
... The formation and evolution of galaxies is one of the most challenging problems in astrophysics today. Throughout the 20th century, our understanding of the way we think galaxies form has changed dramatically. Some of the early models of galaxy formation favored “Monolithic Collapse”, whereby galaxi ...
... The formation and evolution of galaxies is one of the most challenging problems in astrophysics today. Throughout the 20th century, our understanding of the way we think galaxies form has changed dramatically. Some of the early models of galaxy formation favored “Monolithic Collapse”, whereby galaxi ...
Unfolding the Milky Way bulge - International Max Planck Research
... 5.8 The upper panel shows the inner ∼ ±2◦ region around the Galactic plane of our VVV extinction map. AKs values are based on Cardelli et al. (1989) extinction law. Part of this region was also covered by the DENIS survey, used in Schultheis et al. (1999) to build an extinction map shown in the lowe ...
... 5.8 The upper panel shows the inner ∼ ±2◦ region around the Galactic plane of our VVV extinction map. AKs values are based on Cardelli et al. (1989) extinction law. Part of this region was also covered by the DENIS survey, used in Schultheis et al. (1999) to build an extinction map shown in the lowe ...
The Lupus clouds - European Southern Observatory
... evolution and perhaps the origin of the complex. The entire variety of objects related to the various stages of early stellar evolution are represented in Lupus, including some of the best studied T Tauri stars like RU Lup. The determination of many properties of the clouds, as well as their associa ...
... evolution and perhaps the origin of the complex. The entire variety of objects related to the various stages of early stellar evolution are represented in Lupus, including some of the best studied T Tauri stars like RU Lup. The determination of many properties of the clouds, as well as their associa ...
harlow shapley - National Academy of Sciences
... the truly great are indeed happy fellows; second, men and women of accomplishment have an obligation to search out the best young people that come their way and assist them in every possible way in shaping their careers. During his Princeton days, Harlow Shapley studied the cepheid variable stars, w ...
... the truly great are indeed happy fellows; second, men and women of accomplishment have an obligation to search out the best young people that come their way and assist them in every possible way in shaping their careers. During his Princeton days, Harlow Shapley studied the cepheid variable stars, w ...
An Atlas of Stellar Spectra
... The problem of a classification according to luminosity is a difficult one. In the first place, lines or blends which may be useful at one spectral type may be quite insensitive at another. In fact, some lines which show a positive absolute-magnitude effect for some spectral classes may show a negat ...
... The problem of a classification according to luminosity is a difficult one. In the first place, lines or blends which may be useful at one spectral type may be quite insensitive at another. In fact, some lines which show a positive absolute-magnitude effect for some spectral classes may show a negat ...
Communications in Asteroseismology
... the first results from space asteroseismology are available? Isn’t it odd to celebrate the 65th birthday of a renowned asteroseismologist who is far from retirement at this point? The answer to the first question is easy: at the outset of this meeting, MOST was already in space and COROT was soon to b ...
... the first results from space asteroseismology are available? Isn’t it odd to celebrate the 65th birthday of a renowned asteroseismologist who is far from retirement at this point? The answer to the first question is easy: at the outset of this meeting, MOST was already in space and COROT was soon to b ...
environmental effects on galaxy evolution in nearby clusters
... The observational evidences presented in this work suggest that: (I) Giant ellipticals are an old, homogeneous population showing no or little evolution at least in the past 8 Gyr; unlike dwarf ellipticals which still contain young stellar populations. (II) The importance of different environmental ...
... The observational evidences presented in this work suggest that: (I) Giant ellipticals are an old, homogeneous population showing no or little evolution at least in the past 8 Gyr; unlike dwarf ellipticals which still contain young stellar populations. (II) The importance of different environmental ...
my dissertation (PhD. Thesis) - Argelander
... Group to galaxies at a redshift of z ' 11 and higher. Each approach can deliver different information and has its advantages and disadvantages. In the following, I briefly describe what can be learned by research conducted on galaxies at various distances. • Galaxies at cosmological distances may sh ...
... Group to galaxies at a redshift of z ' 11 and higher. Each approach can deliver different information and has its advantages and disadvantages. In the following, I briefly describe what can be learned by research conducted on galaxies at various distances. • Galaxies at cosmological distances may sh ...
The Day We Found the Universe
... clouds were being sighted in the heavens; these faint celestial objects were lurking wherever a telescope gazed away from the Milky Way into deep space. Were these spiral nebulae close to us or were they farther o ? No one knew, because at the turn of the twentieth century astronomers didn't yet hav ...
... clouds were being sighted in the heavens; these faint celestial objects were lurking wherever a telescope gazed away from the Milky Way into deep space. Were these spiral nebulae close to us or were they farther o ? No one knew, because at the turn of the twentieth century astronomers didn't yet hav ...
THE STAR FORMATION AND NUCLEAR ACCRETION HISTORIES OF NORMAL GALAXIES
... 2.2. The Galaxy Sample For our stacking analysis, we cross referenced the XBoötes catalog of X-ray photon positions (i.e., the event list) with those of the galaxies observed by the AGES (C. S. Kochanek et al. 2009, in preparation). We focus on the approximately 6500 galaxies in the 2004 AGES main ...
... 2.2. The Galaxy Sample For our stacking analysis, we cross referenced the XBoötes catalog of X-ray photon positions (i.e., the event list) with those of the galaxies observed by the AGES (C. S. Kochanek et al. 2009, in preparation). We focus on the approximately 6500 galaxies in the 2004 AGES main ...
Abstract The Star Formation History of Low Surface Brightness Galaxies
... The star formation histories of low surface brightness galaxies are interesting but poorly constrained. These objects tend to be rather blue, contradicting the initial impression that they may simply be faded remnants of higher surface brightness galaxies whose star formation has finished. Other sce ...
... The star formation histories of low surface brightness galaxies are interesting but poorly constrained. These objects tend to be rather blue, contradicting the initial impression that they may simply be faded remnants of higher surface brightness galaxies whose star formation has finished. Other sce ...
Mapping the Pathways of Galaxy Transformation Across Time and
... outcomes from the IMACS Cluster-Building Survey: our finding that most z∼0.5 poststarbursts are rejuvenated passive galaxies, and a simple model positing that every galaxy has a lognormal SFH whose parameters are set at birth. Both studies reinterpreted key metrics of galaxy evolution typically seen ...
... outcomes from the IMACS Cluster-Building Survey: our finding that most z∼0.5 poststarbursts are rejuvenated passive galaxies, and a simple model positing that every galaxy has a lognormal SFH whose parameters are set at birth. Both studies reinterpreted key metrics of galaxy evolution typically seen ...
X-ray astronomy of stellar coronae (Review)
... time, in 1975 when Catura et al. (1975) reported the detection of Capella as the first stellar coronal X-ray source on the occasion of a rocket flight. They estimated the X-ray luminosity at 1031 erg s−1 – four orders of magnitude above the Sun’s – and the plasma electron temperature at about 8 × 10 ...
... time, in 1975 when Catura et al. (1975) reported the detection of Capella as the first stellar coronal X-ray source on the occasion of a rocket flight. They estimated the X-ray luminosity at 1031 erg s−1 – four orders of magnitude above the Sun’s – and the plasma electron temperature at about 8 × 10 ...
Differential rotation in Sun-like stars from surface variability and
... from the stellar surface and corona. Stars on the PMS are also magnetically active, and so are expected to have stellar winds. The torque by a stellar wind must be proportional to the rotation rate of the star and the mass-loss rate through a sphere of radius equivalent to the Alfvén radius. Many mo ...
... from the stellar surface and corona. Stars on the PMS are also magnetically active, and so are expected to have stellar winds. The torque by a stellar wind must be proportional to the rotation rate of the star and the mass-loss rate through a sphere of radius equivalent to the Alfvén radius. Many mo ...
Chapter 5 The Evolutionary Paths Of Nearby Galaxies
... Therefore, in the rest of this section I focus on the properties of late-type galaxies to try to understand the mechanisms behind the quenching of the star formation. I also note that a few early-type galaxies lie well outside the red sequence. These are misclassified or peculiar objects and their p ...
... Therefore, in the rest of this section I focus on the properties of late-type galaxies to try to understand the mechanisms behind the quenching of the star formation. I also note that a few early-type galaxies lie well outside the red sequence. These are misclassified or peculiar objects and their p ...
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.