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... hemisphere. Deep in its interior, energy is generated by thermo nuclear fusion reactions, converting hydrogen into helium. It takes millions of years for this energy to slowly flow from the hot central regions to the star’s cooler surface, where the radiation can finally escape into space. For both ...
... hemisphere. Deep in its interior, energy is generated by thermo nuclear fusion reactions, converting hydrogen into helium. It takes millions of years for this energy to slowly flow from the hot central regions to the star’s cooler surface, where the radiation can finally escape into space. For both ...
Simulations of the galaxy population constrained by observations
... We propose a specific model in which reincorporation timescales vary inversely with halo mass and are independent of redshift. This produces an evolving galaxy population which fits observed abundances as a function of stellar mass, B- and K-band luminosity at all redshifts simultaneously. It also p ...
... We propose a specific model in which reincorporation timescales vary inversely with halo mass and are independent of redshift. This produces an evolving galaxy population which fits observed abundances as a function of stellar mass, B- and K-band luminosity at all redshifts simultaneously. It also p ...
L43 THE STARFISH TWINS: TWO YOUNG
... N1 with S4, N2 with S3, and N3 with S1 is equally plausible. A comparison of the fluxes of both PNs at different wavelengths indicates that they are intrinsically similar in size and brightness but are located at different distances. We find that the stellar blue and visual (continuum) fluxes, the H ...
... N1 with S4, N2 with S3, and N3 with S1 is equally plausible. A comparison of the fluxes of both PNs at different wavelengths indicates that they are intrinsically similar in size and brightness but are located at different distances. We find that the stellar blue and visual (continuum) fluxes, the H ...
Astronomy Astrophysics - Max Planck Institut für Radioastronomie
... Brγ-emitting region in these objects is more compact than the dust sublimation radius. For HD 98922, our quantitative analysis reveals that the line-emitting region is compact enough to be consistent with the magnetospheric accretion scenario. For HD 163296, HD 104237, MWC 297, and V921 Sco we ident ...
... Brγ-emitting region in these objects is more compact than the dust sublimation radius. For HD 98922, our quantitative analysis reveals that the line-emitting region is compact enough to be consistent with the magnetospheric accretion scenario. For HD 163296, HD 104237, MWC 297, and V921 Sco we ident ...
The Primeval Populations of the Ultra
... [Fe/H]= −2.3; blue curve) and the low extreme of the metallicity distribution in these UFDs ([Fe/H]= −3.2; green curve). It is clear from the comparison that the luminosity of the MS turnoff and SGB in each galaxy is consistent with ancient metal-poor stars. The few stars immediately brighter and bl ...
... [Fe/H]= −2.3; blue curve) and the low extreme of the metallicity distribution in these UFDs ([Fe/H]= −3.2; green curve). It is clear from the comparison that the luminosity of the MS turnoff and SGB in each galaxy is consistent with ancient metal-poor stars. The few stars immediately brighter and bl ...
Galaxies and their properties
... that κ0 = (37±3) km s−1 kpc−1 and κ0 /Ω0 = 1.35±0.05. Thus, the sun oscillates about 1.35 times in the radial direction, by the time it completes an orbit around the galactic center. ...
... that κ0 = (37±3) km s−1 kpc−1 and κ0 /Ω0 = 1.35±0.05. Thus, the sun oscillates about 1.35 times in the radial direction, by the time it completes an orbit around the galactic center. ...
Robert_Minchin_Galaxies_2011_REU
... The Observed Rotation Curve • In the 1970s, interferometers such as the VLA and WSRT observed the rotation curves of spiral galaxies • They were able to trace the rotation curves out beyond the stellar disc. • The resulting curves were flat or slightly rising, not falling as predicted ...
... The Observed Rotation Curve • In the 1970s, interferometers such as the VLA and WSRT observed the rotation curves of spiral galaxies • They were able to trace the rotation curves out beyond the stellar disc. • The resulting curves were flat or slightly rising, not falling as predicted ...
Investigate Planets, Stars, Galaxies, and the Universe
... 7. Turn around, and walk towards the “Interacting galaxies” station (near the green signs “Neptune” and “Uranus”). Watch the video of two galaxies colliding. With a partner, take turns narrating what happens in the video. Record some notes from your narration on the back of this page. ...
... 7. Turn around, and walk towards the “Interacting galaxies” station (near the green signs “Neptune” and “Uranus”). Watch the video of two galaxies colliding. With a partner, take turns narrating what happens in the video. Record some notes from your narration on the back of this page. ...
Chapter 11 The Solar Wind
... and the magnetic pressure is B 2 /(8π) = 1.7 × 10−10 ; much smaller than the kinetic energy density ρu2 /2 = 9.4 × 10−9 erg cm−3 . At any given time, part of the sun’s corona is emitting a low-speed wind, and part is emitting a high-speed wind. (The high-speed winds appear to come from “coronal hole ...
... and the magnetic pressure is B 2 /(8π) = 1.7 × 10−10 ; much smaller than the kinetic energy density ρu2 /2 = 9.4 × 10−9 erg cm−3 . At any given time, part of the sun’s corona is emitting a low-speed wind, and part is emitting a high-speed wind. (The high-speed winds appear to come from “coronal hole ...
ppt
... One finds that the Andromeda Galaxy and the Milky Way are approaching one another at a speed of 100 - 140 km/sec. Some astronomers believe that Andromeda and the Milky Way will eventually merge together. The impact is predicted to occur in about 3 billion years. In that case the two galaxies will l ...
... One finds that the Andromeda Galaxy and the Milky Way are approaching one another at a speed of 100 - 140 km/sec. Some astronomers believe that Andromeda and the Milky Way will eventually merge together. The impact is predicted to occur in about 3 billion years. In that case the two galaxies will l ...
Milky Way Galaxy
... The spiral galaxies M 91 (left) and M 109 (right) have bars across their nuclei from which spiral arms unwind. In virtually all spirals (barred or not) the galaxies rotate such that the spiral arms trail behind in the rotation. The Milky Way is thought to be a barred spiral galaxy. ...
... The spiral galaxies M 91 (left) and M 109 (right) have bars across their nuclei from which spiral arms unwind. In virtually all spirals (barred or not) the galaxies rotate such that the spiral arms trail behind in the rotation. The Milky Way is thought to be a barred spiral galaxy. ...
July 2014 BRAS Newsletter - The Baton Rouge Astronomical Society
... They did not identify any Earth-like planet with TERRA with an orbital period of 200 to 400 days, but they attribute that primarily to the shortness of the Kepler survey before the loss of the spacecraft’s stabilizing reaction wheel in May 2013, and the difficulty of observing such long-period plane ...
... They did not identify any Earth-like planet with TERRA with an orbital period of 200 to 400 days, but they attribute that primarily to the shortness of the Kepler survey before the loss of the spacecraft’s stabilizing reaction wheel in May 2013, and the difficulty of observing such long-period plane ...
Strongly Interacting Supernovae - The National Centre for Radio
... Shock Formation in Supernovae: Blast wave shock : Ejecta expansion speed is much higher than sound speed. Shocked Circumstellar Medium: Interaction of blast wave with CSM . CSM is accelerated, compressed, heated and shocked. Reverse Shock Formation: Due to deceleration of shocked ejecta around cont ...
... Shock Formation in Supernovae: Blast wave shock : Ejecta expansion speed is much higher than sound speed. Shocked Circumstellar Medium: Interaction of blast wave with CSM . CSM is accelerated, compressed, heated and shocked. Reverse Shock Formation: Due to deceleration of shocked ejecta around cont ...
File
... their radio telescopes on certain areas of space that appear empty, astronomers have discovered additional information about the composition and distribution of matter in space—information that cannot be detected by optical equipment. For example, although hydrogen outside of stars emits no light, i ...
... their radio telescopes on certain areas of space that appear empty, astronomers have discovered additional information about the composition and distribution of matter in space—information that cannot be detected by optical equipment. For example, although hydrogen outside of stars emits no light, i ...
Lab 7
... star chart printed on a page, we often forget about the three-dimensional nature of the universe. In this exercise, you will construct (with welding rods and Styrofoam balls) a model of nearby space including many of the nearest stars. Of course, you will need information on where to place the stars ...
... star chart printed on a page, we often forget about the three-dimensional nature of the universe. In this exercise, you will construct (with welding rods and Styrofoam balls) a model of nearby space including many of the nearest stars. Of course, you will need information on where to place the stars ...
Herschel far-infrared observations of the Carina Nebula complex⋆
... Key words. stars: formation – circumstellar matter – stars: protostars – stars: luminosity function, mass function – ISM: individual objects: NGC 3372 – stars: individual: η Carinae ...
... Key words. stars: formation – circumstellar matter – stars: protostars – stars: luminosity function, mass function – ISM: individual objects: NGC 3372 – stars: individual: η Carinae ...
How much radioactive nickel does ASASSN
... that ASASSN–15lh is clearly not a pair-instability explosion. As we mention in Section 1, if consider a magnetar origin for ASASSN–15lh, the magnetar requires a period of 1–2 ms, magnetic field of 0.3–1×10 14 G, and mass of the ejecta of 6 M⊙ (Bersten et al. 2016), or 0.7 ms, 2.5 × 10 13 G, and 8.3 ...
... that ASASSN–15lh is clearly not a pair-instability explosion. As we mention in Section 1, if consider a magnetar origin for ASASSN–15lh, the magnetar requires a period of 1–2 ms, magnetic field of 0.3–1×10 14 G, and mass of the ejecta of 6 M⊙ (Bersten et al. 2016), or 0.7 ms, 2.5 × 10 13 G, and 8.3 ...
The Search for Exoplanets - Worcester Polytechnic Institute
... being large gas giants like Jupiter or Saturn, while others are small and rocky, like Earth and Mars. Exoplanets are almost always found to be gravitationally bound to a stellar system, however, there is at least some evidence to suggest that there may be a small minority of “rogue exoplanets” that ...
... being large gas giants like Jupiter or Saturn, while others are small and rocky, like Earth and Mars. Exoplanets are almost always found to be gravitationally bound to a stellar system, however, there is at least some evidence to suggest that there may be a small minority of “rogue exoplanets” that ...
PPT
... • Note that by design, this definition only applies to planets in our Solar System. Definition of planets in other Solar Systems was postponed until future deliberations of the IAU. Page 5 ...
... • Note that by design, this definition only applies to planets in our Solar System. Definition of planets in other Solar Systems was postponed until future deliberations of the IAU. Page 5 ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.