Cosmic Rays
... decays of (hypothetical) dark-matter particles; should result in different energy spectra than in CR predictions ...
... decays of (hypothetical) dark-matter particles; should result in different energy spectra than in CR predictions ...
Tracing the Evolution and Impact of the Stellar Winds
... the Charge, Element, and Isotope Analysis System, or CELIAS, that uses a charge sensor to discern the temperature and speed of the most common solar wind ions as they speed on by.1 Through careful observation and analysis, two distinct types of solar wind were uncovered: fast and slow. The fast wind ...
... the Charge, Element, and Isotope Analysis System, or CELIAS, that uses a charge sensor to discern the temperature and speed of the most common solar wind ions as they speed on by.1 Through careful observation and analysis, two distinct types of solar wind were uncovered: fast and slow. The fast wind ...
Lecture 2
... • CO emitting galaxies may contribute significant mass and star formation • New telescopes such as ALMA, SKA and the EVLA will be crucial for completing the picture at z=3 and above. ...
... • CO emitting galaxies may contribute significant mass and star formation • New telescopes such as ALMA, SKA and the EVLA will be crucial for completing the picture at z=3 and above. ...
The nature of the faint galaxies in the Hubble Deep Field
... the PISA software in the Starlink environment. These were further confirmed using the FOCAS/IRAF source identification package. Aperture photometry was then carried out with PHOTOM on all the identified galaxies, using an aperture size of O.5-arcsec radius. For 0.5 < z < 3, this corresponds to a lin ...
... the PISA software in the Starlink environment. These were further confirmed using the FOCAS/IRAF source identification package. Aperture photometry was then carried out with PHOTOM on all the identified galaxies, using an aperture size of O.5-arcsec radius. For 0.5 < z < 3, this corresponds to a lin ...
Properties of simulated Milky Way-mass galaxies in loose group and
... distance of 500–700 kpc but have no haloes more massive than 5 × 1012 M within 5 Mpc. Please note that the loose groups are not specifically constrained to be pairs, rather they may include up to four haloes each with Mvir > 1011 M . The field sample consists of galaxies that have no other dark ma ...
... distance of 500–700 kpc but have no haloes more massive than 5 × 1012 M within 5 Mpc. Please note that the loose groups are not specifically constrained to be pairs, rather they may include up to four haloes each with Mvir > 1011 M . The field sample consists of galaxies that have no other dark ma ...
JENAM-2011 Book of abstracts
... ESA’s Hipparcos astrometry mission was a particularly innovative project in space astronomy. The satellite was launched in 1989 (already more than 20 years ago) with the final Hipparcos and Tycho Catalogues fully published just eight years later. Exceeding the original scientific specifications in term ...
... ESA’s Hipparcos astrometry mission was a particularly innovative project in space astronomy. The satellite was launched in 1989 (already more than 20 years ago) with the final Hipparcos and Tycho Catalogues fully published just eight years later. Exceeding the original scientific specifications in term ...
THE MORPHOLOGICAL DEMOGRAPHICS OF GALAXIES IN THE
... were f (R) = 2π 0R I(r)dr is the integrated flux within the radius R. The determination of the radius R up to where to integrate the light is of importance particularly for the asymmetry values. As we sample galaxies over ever larger cosmic ages, the surface brightness of galaxies at higher redshift ...
... were f (R) = 2π 0R I(r)dr is the integrated flux within the radius R. The determination of the radius R up to where to integrate the light is of importance particularly for the asymmetry values. As we sample galaxies over ever larger cosmic ages, the surface brightness of galaxies at higher redshift ...
Nebulae.The Lagoon and Dumbbell Nebulae
... a remnant of a dying star which is approximately 2 times smaller than the Sun. The star is hot and blue with temperature of 85000K (Most of these stars usually turn into red giants. They lose their mass by ejection of the outer gas layers. These layers expand in space, forming a temporary wrap aroun ...
... a remnant of a dying star which is approximately 2 times smaller than the Sun. The star is hot and blue with temperature of 85000K (Most of these stars usually turn into red giants. They lose their mass by ejection of the outer gas layers. These layers expand in space, forming a temporary wrap aroun ...
A Herschel/HIFI study of Water in Two Intermediate
... slowly into a molecular cloud under the forces of gravity, fed by either external stimulation from supernovae or slowly attracting more mass from the leftover material after less violent star deaths. Molecular clouds are gravitationally bound objects that exhibit velocity dispersions on large scales ...
... slowly into a molecular cloud under the forces of gravity, fed by either external stimulation from supernovae or slowly attracting more mass from the leftover material after less violent star deaths. Molecular clouds are gravitationally bound objects that exhibit velocity dispersions on large scales ...
Cold Gas and Star Formation in Elliptical Galaxies
... than a few µm. Long wavelength emission is also detected towards a significant fraction of early-type galaxies by IRAS (12µm, 25µm, 60µm and 100µm), ISO (between about 5µm and 200 µm; Malhotra et al. 1998, S. Madden, this conference) and at submillimeter wavelengths. The largest sample available is ...
... than a few µm. Long wavelength emission is also detected towards a significant fraction of early-type galaxies by IRAS (12µm, 25µm, 60µm and 100µm), ISO (between about 5µm and 200 µm; Malhotra et al. 1998, S. Madden, this conference) and at submillimeter wavelengths. The largest sample available is ...
Stars as cosmological tools: giving light to Dark Matter
... Figure 1.1: The Coma cluster observed by the X-ray telescope ROSAT [6]. The temperature of the intracluster gas is used to infer the total mass of the cluster, revealing the existence of large amounts of invisible mass. virial theorem (relating the kinetic and potential energy of the system), he est ...
... Figure 1.1: The Coma cluster observed by the X-ray telescope ROSAT [6]. The temperature of the intracluster gas is used to infer the total mass of the cluster, revealing the existence of large amounts of invisible mass. virial theorem (relating the kinetic and potential energy of the system), he est ...
ultraviolet radiation in the solar system
... 5.12.1 UV Index . . . . . . . . . . . . . . . . . . . . . . 5.12.2 Diurnal Variation of UV Surface Radiation . . . ...
... 5.12.1 UV Index . . . . . . . . . . . . . . . . . . . . . . 5.12.2 Diurnal Variation of UV Surface Radiation . . . ...
Sunday, March 24, 2013
... The Odds Must be Crazy (with apologies to the Website & Podcast) One of the greatest potential pitfalls of Arp's hypothesis was that these alignments could be perfectly ordinary chance alignments between bright foreground galaxies and more distant, but brighter, background objects. Arp and supporte ...
... The Odds Must be Crazy (with apologies to the Website & Podcast) One of the greatest potential pitfalls of Arp's hypothesis was that these alignments could be perfectly ordinary chance alignments between bright foreground galaxies and more distant, but brighter, background objects. Arp and supporte ...
Dust in the Circumgalactic Medium of Low
... the Main Galaxy Sample from the data release 7 (Strauss et al. 2002) and use the magnitude limited selection r < 17.77. This produces a sample of 695,652 foreground galaxies for which two intrinsic properties are extracted from the MPA-JHU value-added catalog (Kauffmann et al. 2003; Brinchmann et al ...
... the Main Galaxy Sample from the data release 7 (Strauss et al. 2002) and use the magnitude limited selection r < 17.77. This produces a sample of 695,652 foreground galaxies for which two intrinsic properties are extracted from the MPA-JHU value-added catalog (Kauffmann et al. 2003; Brinchmann et al ...
Simulating the outer layers of Procyon A: a comparison with the Sun
... For all these reasons and in view of theoretical predictions that the p-mode oscillation amplitudes would be relatively large (Christensen-Dalsgaard & Frandsen 1983; Houdek et al. 1999), Procyon has been a prime candidate for seismic observations from the ground and in space. Interestingly, now that ...
... For all these reasons and in view of theoretical predictions that the p-mode oscillation amplitudes would be relatively large (Christensen-Dalsgaard & Frandsen 1983; Houdek et al. 1999), Procyon has been a prime candidate for seismic observations from the ground and in space. Interestingly, now that ...
S282_2 Introduction to active galaxies
... similar to those in our own Galaxy; and spiral galaxies have additional similarities to the Milky Way in their gas and dust content. Active galaxies show extra emission of radiation, and this is most apparent from the spectra. Active galaxies come in a variety of types, including Seyfert galaxies, q ...
... similar to those in our own Galaxy; and spiral galaxies have additional similarities to the Milky Way in their gas and dust content. Active galaxies show extra emission of radiation, and this is most apparent from the spectra. Active galaxies come in a variety of types, including Seyfert galaxies, q ...
The Origin of Comets - Wesley Grove Chapel
... settle toward the swarm’s center of mass. How gently? More softly than large snowflakes settling onto a windless, snowcovered field. More softly, because the swarm’s gravity is much weaker than Earth’s gravity. Eventually, most particles in this swarm would become a rotating clump of fluffy ice part ...
... settle toward the swarm’s center of mass. How gently? More softly than large snowflakes settling onto a windless, snowcovered field. More softly, because the swarm’s gravity is much weaker than Earth’s gravity. Eventually, most particles in this swarm would become a rotating clump of fluffy ice part ...
Simulating the outer layers of Procyon A: a comparison with the Sun
... (hereafter SAL) between the atmosphere and deep convection. It is in the SAL region that the p-modes are believed to be excited by stochastic processes. In the next section, we describe briefly the starting model and the procedure followed in carrying out the 3D numerical simulation. Section 3 discu ...
... (hereafter SAL) between the atmosphere and deep convection. It is in the SAL region that the p-modes are believed to be excited by stochastic processes. In the next section, we describe briefly the starting model and the procedure followed in carrying out the 3D numerical simulation. Section 3 discu ...
The universe of the coming ALMA revolution
... Only now has technology caught up with the dream of opening up a rich new vein of the spectrum to high-resolution exploration. Millimeter-wavelength light is a “sweet spot” for tomorrow’s astronomy because… It’s what half the light is. In addition to the cosmic microwave background (a nearly uniform ...
... Only now has technology caught up with the dream of opening up a rich new vein of the spectrum to high-resolution exploration. Millimeter-wavelength light is a “sweet spot” for tomorrow’s astronomy because… It’s what half the light is. In addition to the cosmic microwave background (a nearly uniform ...
Chap3-Astrometry
... field whose positions are known. Actual stars not ideal reference that stars are all moving! Use of distant (non-moving) extragalactic sources (Quasars) is used in practice. The International Celestial Reference Frame (ICRF) is q quasiintertial reference frame centered at the barycentr of the ...
... field whose positions are known. Actual stars not ideal reference that stars are all moving! Use of distant (non-moving) extragalactic sources (Quasars) is used in practice. The International Celestial Reference Frame (ICRF) is q quasiintertial reference frame centered at the barycentr of the ...
A New Model without Dark Matter for the Rotation of Spiral Galaxies
... of galaxies. They have found “in addition to a ring structure in the gas, there is often measurable expansion with higher radial velocities occurring near the nucleus” and also they show that “radially progressive bursts of star format ion can account for a wide range of these observed phenomena and ...
... of galaxies. They have found “in addition to a ring structure in the gas, there is often measurable expansion with higher radial velocities occurring near the nucleus” and also they show that “radially progressive bursts of star format ion can account for a wide range of these observed phenomena and ...
Gravitationally lensed galaxies at 2 z 3.5: direct abundance
... and we will return in Section 4 with a more detailed treatment of this line. At a low S/N we detect the semiforbidden N IV] λ1486 line which is rarely seen in high-z galaxies, although a few detections of this line in emission are reported for lensed galaxies, for example cB58 (Pettini et al. 2000), ...
... and we will return in Section 4 with a more detailed treatment of this line. At a low S/N we detect the semiforbidden N IV] λ1486 line which is rarely seen in high-z galaxies, although a few detections of this line in emission are reported for lensed galaxies, for example cB58 (Pettini et al. 2000), ...
DEDUCING THE LIFETIME OF SHORT GAMMA
... late-type galaxies peaks at masses slightly less than M ∗ and has a tail extending to low stellar masses. Early-type galaxies have a narrow stellar mass density distribution around M ∗ and dominate the local stellar mass budget above a few times 1010 M⊙ . Although early-type galaxies are far less in ...
... late-type galaxies peaks at masses slightly less than M ∗ and has a tail extending to low stellar masses. Early-type galaxies have a narrow stellar mass density distribution around M ∗ and dominate the local stellar mass budget above a few times 1010 M⊙ . Although early-type galaxies are far less in ...
Astronomy Test Review
... d. They have impact craters. ____ 19. Impact craters are caused by a. solar bursts. b. atmospheric changes. ...
... d. They have impact craters. ____ 19. Impact craters are caused by a. solar bursts. b. atmospheric changes. ...
Outer space
Outer space, or just space, is the void that exists between celestial bodies, including the Earth. It is not completely empty, but consists of a hard vacuum containing a low density of particles, predominantly a plasma of hydrogen and helium as well as electromagnetic radiation, magnetic fields, neutrinos, dust and cosmic rays. The baseline temperature, as set by the background radiation from the Big Bang, is 2.7 kelvin (K). Plasma with a number density of less than one hydrogen atom per cubic metre and a temperature of millions of kelvin in the space between galaxies accounts for most of the baryonic (ordinary) matter in outer space; local concentrations have condensed into stars and galaxies. In most galaxies, observations provide evidence that 90% of the mass is in an unknown form, called dark matter, which interacts with other matter through gravitational but not electromagnetic forces. Data indicates that the majority of the mass-energy in the observable Universe is a poorly understood vacuum energy of space which astronomers label dark energy. Intergalactic space takes up most of the volume of the Universe, but even galaxies and star systems consist almost entirely of empty space.There is no firm boundary where space begins. However the Kármán line, at an altitude of 100 km (62 mi) above sea level, is conventionally used as the start of outer space in space treaties and for aerospace records keeping. The framework for international space law was established by the Outer Space Treaty, which was passed by the United Nations in 1967. This treaty precludes any claims of national sovereignty and permits all states to freely explore outer space. Despite the drafting of UN resolutions for the peaceful uses of outer space, anti-satellite weapons have been tested in Earth orbit.Humans began the physical exploration of space during the 20th century with the advent of high-altitude balloon flights, followed by manned rocket launches. Earth orbit was first achieved by Yuri Gagarin of the Soviet Union in 1961 and unmanned spacecraft have since reached all of the known planets in the Solar System. Due to the high cost of getting into space, manned spaceflight has been limited to low Earth orbit and the Moon.Outer space represents a challenging environment for human exploration because of the dual hazards of vacuum and radiation. Microgravity also has a negative effect on human physiology that causes both muscle atrophy and bone loss. In addition to these health and environmental issues, the economic cost of putting objects, including humans, into space is high.