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Full Text - Departement Natuurkunde en Sterrenkunde
Full Text - Departement Natuurkunde en Sterrenkunde

... Stars seem to be a constant factor in our nightly skies. People often do not realise that stars evolve and change, and that one day, they will die and fade, some very quietly, some explosively. We do not have to wait an evolutionary long time to see stellar changes, however. One can detect stellar v ...
Astronomy Astrophysics Gaia-ESO Survey: The analysis of high-resolution The
Astronomy Astrophysics Gaia-ESO Survey: The analysis of high-resolution The

... the complete Survey data set will be reanalyzed. Therefore, future releases of data products will supersede previous releases. Below is a description of iDR2: • Internal Data Release 2 (iDR2): this data release consisted of all spectra obtained from the beginning of the Survey up to the end of June ...
Article PDF - IOPscience
Article PDF - IOPscience

... history of the Milky Way and the galaxy formation process in general. For example, in a recent theoretical study, Hargis et al. (2014) suggested that there may be between 300 and 700 lowluminosity (<10 3 L ) dwarf satellite galaxies orbiting the Milky Way within 300 kpc of the Sun. However, the cen ...
Neutrino Astrophysics
Neutrino Astrophysics

... was the apparent absence of energy conservation in nuclear β decay that first lead Wolfgang Pauli, more than 80 years ago, to suggest that some undetected neutral particle (the νe ) must be escaping from nuclear β decay experiments. Neutrinos play a very special role in astrophysics [2]. First, they ...
IRAM Annual Report 2012
IRAM Annual Report 2012

... the 3.2 mm continuum peak. (bottom) N2H+(1-0) spectrum resulting from combined IRAM interferometer and 30m telescope observations. Work by André et al. 2012, Science, 337, 69 ...
A Variability Study of the Typical Red Supergiant Antares A
A Variability Study of the Typical Red Supergiant Antares A

... at the Elginfield observatory from April 2008 until July 2010. These data were combined with historical radial velocity measures, Hipparcos photometry, and AAVSO photometry. From these data we determine four scales of variability: ~7140 days, 2167 days, ~1260 days, and ~100 days. The longest of thes ...
Gaia 1 and 2. A pair of new satellites of the Galaxy
Gaia 1 and 2. A pair of new satellites of the Galaxy

... information, we have to be particularly careful when selecting objects for the satellite search (we cannot use colourmagnitude masks based on stellar isochrones, as in i.e. Koposov et al. 2015). For the analysis in this paper we apply only two selection cuts. First cut concerns the Gaia G magnitude: ...
Gamma-Ray Bursts and Puzzles of Core
Gamma-Ray Bursts and Puzzles of Core

... by spectra of brighter galaxies. With regard to these effects, the R distribution of z for GRB host galaxies well follows the Hubble course for all other “normal” (non-peculiar) galaxies of the deep survey. (In this picture one can see galaxies of large and small luminosities up to dwarfs for identi ...
W.M. Keck Observatory Annual Report 2009
W.M. Keck Observatory Annual Report 2009

... of NASA’s Goddard Space Flight Center and his released globally on Mars during summer in the planet’s colleagues used Keck’s Near Infrared Spectrograph northern hemisphere. Image courtesy of NASA. (NIRSPEC) and other facilities, particularly NASA’s Infrared Telescope also on Mauna Kea, to observe th ...
6.7 GHz Methanol Masers and the GBT
6.7 GHz Methanol Masers and the GBT

... • The methodology is to combine the initial mass function with the star formation law in the Galaxy (as a function of position) to create a distribution of massive stars as a function of galactic longitude. • Then, assuming that every massive star excites a methanol maser during its birth, one can d ...
Niraj D. Welikala Thesis - D-Scholarship@Pitt
Niraj D. Welikala Thesis - D-Scholarship@Pitt

... dark matter halos and just like the dark matter halos, undergo hierarchical merging, with smaller galaxies merging to become larger ones. In this picture, the clusters of galaxies we see today, such as the Coma cluster, shown in the top left panel of Figure 1.2 must have been assembled from this mas ...
The physics of line-driven winds of hot massive stars
The physics of line-driven winds of hot massive stars

... Galaxies are comprised of stars and clouds of gas. Stars that appear equally bright to the naked eye may either be nearby objects that are relatively dim or distant objects that are very luminous. The intrinsically brightest stars are the topic of this thesis. Their luminosities can be more than a m ...
Power Point Presentation
Power Point Presentation

... powerful to strike Earth from beyond the solar system ever detected - had a significant effect on Earth's upper atmosphere, report Stanford researchers. It is the first time that a significant change in Earth's environment has been traced to energy from a distant star. (from the NASA press release) ...
probing quasar environments with tunable filter
probing quasar environments with tunable filter

... MRC B1256-243 lack the sensitivity to probe deep into the quasar environment, but detect a number of extremely luminous objects. In BR B0019-1522, we show convincing evidence of a protocluster, including both galaxy and star formation rate densities an order of magnitude higher than that observed in ...
Properties of White Dwarfs, Teacher Guide
Properties of White Dwarfs, Teacher Guide

... A. What kind of motion does Sirius show? Justify your answer. Sirius shows a periodic motion over a long time. It follows a pattern. Some background: Sirius is a nearby star – only 9 light-years away. All stars in our Galaxy orbit the Galactic barycenter, so they are all moving. Astronomers detect a ...
Type Ia Supernovae
Type Ia Supernovae

... and happening only every few centuries, have probably been observed since the beginnings of mankind. At first they were interpreted as religious omens but in the last half millennium they have increasingly been used to study the cosmos and our place in it. Tycho Brahe deduced from his observations o ...


... disks out of disk material. These are called pseudobulges. Our discussion updates a review by Kormendy (1993). The relative importance of the different physical processes of galaxy evolution (Figure 1) changes as the Universe expands. Rapid processes that happen in discrete events are giving way to ...
Probing nuclear activity versus star formation at z ∼ 0.8 using near
Probing nuclear activity versus star formation at z ∼ 0.8 using near

... contribution from the AGN. These optically dull AGN are defined as X-ray-selected AGN with no evidence for nuclear accretion activity in optical spectroscopy, showing stellar emission-dominated or obscured optical-to-infrared (IR) SEDs instead, practically indistinguishable from those of spiral/star ...
IRAM Annual Report 2011
IRAM Annual Report 2011

Spectacular Evidence of the Greatness of Almighty Allah
Spectacular Evidence of the Greatness of Almighty Allah

Strongly suggested reading: The Milky Way`s stellar disk
Strongly suggested reading: The Milky Way`s stellar disk

... ages. We know that in principle this enormous wealth of information about the stellar body of our Galaxy holds a key to recognizing and understanding some of the mechanisms that create and evolve disk galaxies. And it holds a key to mapping the three-dimensional gravitational potential and by implic ...
Physics of the Interstellar Medium
Physics of the Interstellar Medium

... ISM. It has become clear that its non-linear dynamics and multi-scale structure requires coupling magnetohydrodynamics with chemical networks that include dust physics, gas phase transitions, and thermodynamical heating and cooling processes, as well as star formation and stellar feedback. All of th ...
Hubble 2006: Science Year in Review
Hubble 2006: Science Year in Review

... Hubble’s most powerful camera, the Advanced Camera for Surveys (ACS), providing a tenfold improvement over WFPC2. The final servicing mission in 2008 will install two new instruments, the Cosmic Origins Spectrograph (COS) and Wide Field Camera 3 (WFC3). COS is the most sensitive ultraviolet spectrog ...
environmental effects on galaxy evolution in nearby clusters
environmental effects on galaxy evolution in nearby clusters

... The environmental effects on galaxy evolution in nearby clusters are investigated using a multiwavelength dataset. The present analysis is focused on the properties of three (Abell 1367, Virgo and Coma) among the best studied clusters in the local Universe. Due to the variety of their environmental ...
The Evolution of Star Formation Activity in . Cory R. Wagner
The Evolution of Star Formation Activity in . Cory R. Wagner

... 24 µm data for isolated high-redshift galaxies. We calculate rest-frame ultraviolet star formation rates for low-redshift cluster members using Hubble Space Telescope observations. Using publically available mid-infrared and ultraviolet data for our field sample, we empirically derive scaling relati ...
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Future of an expanding universe

Observations suggest that the expansion of the universe will continue forever. If so, the universe will cool as it expands, eventually becoming too cold to sustain life. For this reason, this future scenario is popularly called the Big Freeze.If dark energy—represented by the cosmological constant, a constant energy density filling space homogeneously, or scalar fields, such as quintessence or moduli, dynamic quantities whose energy density can vary in time and space—accelerates the expansion of the universe, then the space between clusters of galaxies will grow at an increasing rate. Redshift will stretch ancient, incoming photons (even gamma rays) to undetectably long wavelengths and low energies. Stars are expected to form normally for 1012 to 1014 (1–100 trillion) years, but eventually the supply of gas needed for star formation will be exhausted. And as existing stars run out of fuel and cease to shine, the universe will slowly and inexorably grow darker, one star at a time. According to theories that predict proton decay, the stellar remnants left behind will disappear, leaving behind only black holes, which themselves eventually disappear as they emit Hawking radiation. Ultimately, if the universe reaches a state in which the temperature approaches a uniform value, no further work will be possible, resulting in a final heat death of the universe.
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