Cosmic Feedback from Supermassive Black Holes
... Every massive galaxy appears to have a massive black hole at its center whose mass is about 0.2% of the mass of the galaxy's bulge (Tremaine et al. 2002). It is now widely considered that the black hole may have brought about this correlation by regulating the amount of gas available for star format ...
... Every massive galaxy appears to have a massive black hole at its center whose mass is about 0.2% of the mass of the galaxy's bulge (Tremaine et al. 2002). It is now widely considered that the black hole may have brought about this correlation by regulating the amount of gas available for star format ...
The Effective Temperature and the Absolute Magnitude of the Stars
... In posing the problem it is important to propose that the material which makes up the stars is always considered as having a fixed composition, with temperature and mass density values increasing inwards, towards the interior of the star. Additionally, the star configuration is considered to have sp ...
... In posing the problem it is important to propose that the material which makes up the stars is always considered as having a fixed composition, with temperature and mass density values increasing inwards, towards the interior of the star. Additionally, the star configuration is considered to have sp ...
Extreme Stars
... billion years ago Stars have been forming continuously since the Universe began 13.7 billion years ago Some old stars are still around; other stars are brand new ...
... billion years ago Stars have been forming continuously since the Universe began 13.7 billion years ago Some old stars are still around; other stars are brand new ...
ppt - ciera
... fields reveals no new 530 s pulsars, so there is a <0.5% chance of finding a magnetar in any field (Nechita, Gaensler, Muno, et al. in prep). • The pulsar is well within the cluster, with a <10% chance of being an unrelated X-ray source. ...
... fields reveals no new 530 s pulsars, so there is a <0.5% chance of finding a magnetar in any field (Nechita, Gaensler, Muno, et al. in prep). • The pulsar is well within the cluster, with a <10% chance of being an unrelated X-ray source. ...
Milky Way Bulge
... • Globular clusters + field stars • Field stars = high velocity stars • ~150 globular clusters known, in 2 different systems: • Older (~13 Gyr) • -2.5 < [Fe/H] < -0.8 • Spherical distribution around galactic center • No net rotation ...
... • Globular clusters + field stars • Field stars = high velocity stars • ~150 globular clusters known, in 2 different systems: • Older (~13 Gyr) • -2.5 < [Fe/H] < -0.8 • Spherical distribution around galactic center • No net rotation ...
Brown Dwarfs and M Dwarfs
... A modest proposal for explaining the violation of the radio vs. X-ray luminosity law • BDs have cool neutral atmospheres → magnetic fields have little free energy in the photosphere → low heating rate for the corona. • Coronae are cooler with small pressure scale heights and low densities. Coronal ...
... A modest proposal for explaining the violation of the radio vs. X-ray luminosity law • BDs have cool neutral atmospheres → magnetic fields have little free energy in the photosphere → low heating rate for the corona. • Coronae are cooler with small pressure scale heights and low densities. Coronal ...
How can you get involved in research?
... “Arcs” of light from background galaxies bent by the gravitational mass of the galaxy cluster in the foreground. This is evidence for dark matter. ...
... “Arcs” of light from background galaxies bent by the gravitational mass of the galaxy cluster in the foreground. This is evidence for dark matter. ...
The correct answers are written in bold, italic and underlined. The
... fraction of the initial ionized hydrogen atom? • About 100% ...
... fraction of the initial ionized hydrogen atom? • About 100% ...
From Rubber Bands to Big Bangs
... 1) Make one cut in you rubber band so that it makes a flat piece. 2) Draw a wave pattern from one end to the other end. 3) Place 4 stars randomly on the rubber band. Number each star starting with number one. 4) Now stretch the rubber band and describe: a) what happens to the distance between the st ...
... 1) Make one cut in you rubber band so that it makes a flat piece. 2) Draw a wave pattern from one end to the other end. 3) Place 4 stars randomly on the rubber band. Number each star starting with number one. 4) Now stretch the rubber band and describe: a) what happens to the distance between the st ...
From Rubber Bands to Big Bangs The Universe has been
... 1) Make one cut in you rubber band so that it makes a flat piece. 2) Draw a wave pattern from one end to the other end. 3) Place 4 stars randomly on the rubber band. Number each star starting with number one. 4) Now stretch the rubber band and describe: a) what happens to the distance between the st ...
... 1) Make one cut in you rubber band so that it makes a flat piece. 2) Draw a wave pattern from one end to the other end. 3) Place 4 stars randomly on the rubber band. Number each star starting with number one. 4) Now stretch the rubber band and describe: a) what happens to the distance between the st ...
From ATLASGAL to SEDIGISM: Towards a Complete 3D View of the
... formation seems to be ongoing within 20 % of these filaments, preferentially within the ones with the largest mass-tolength ratios. Moreover, these filaments are predominantly aligned with the Galactic Plane, and associated with the spiral arms. This seems to indicate a direct link between star form ...
... formation seems to be ongoing within 20 % of these filaments, preferentially within the ones with the largest mass-tolength ratios. Moreover, these filaments are predominantly aligned with the Galactic Plane, and associated with the spiral arms. This seems to indicate a direct link between star form ...
Ch 28 Class Notes
... Because Earth orbits the sun, astronomers experience parallax when they observe the stars. Astronomers can _____________ ______________________________________________________________________________, by knowing the angle between two observed positions and the distance between the observation point ...
... Because Earth orbits the sun, astronomers experience parallax when they observe the stars. Astronomers can _____________ ______________________________________________________________________________, by knowing the angle between two observed positions and the distance between the observation point ...
Astronomy 112: The Physics of Stars Class 17 Notes: Core Collapse
... One important effect that distinguishes the evolution of massive stars from that of lower mass stars is the importance of mass loss, both on the main sequence and thereafter. Low mass stars do not experience significant mass loss before the AGB phase, but massive stars, as we have already seen, can ...
... One important effect that distinguishes the evolution of massive stars from that of lower mass stars is the importance of mass loss, both on the main sequence and thereafter. Low mass stars do not experience significant mass loss before the AGB phase, but massive stars, as we have already seen, can ...
Summary of the Presentation
... obtained from the Gliese catalog was 385,000. After correcting for close binaries and (assuming a constant production rate) eliminating 2/3 as being too young, the value of R was estimated to be ~85,000 suitable stars per billion cubic light years. Of the stars examined for planets, planets have bee ...
... obtained from the Gliese catalog was 385,000. After correcting for close binaries and (assuming a constant production rate) eliminating 2/3 as being too young, the value of R was estimated to be ~85,000 suitable stars per billion cubic light years. Of the stars examined for planets, planets have bee ...
School Powerpoint Presentation on Planet X 2011
... Oort Cloud Anomaly • The Oort cloud is thought to occupy a vast space from ~2,000AU (~0.03 ly) to ~ 50,000 AU (0.79 ly) from the Sun. Some estimates place the outer edge at between 100,000 and 200,000 AU (1.58 and 3.16 ly) • Long-period comets come from the Oort Cloud ...
... Oort Cloud Anomaly • The Oort cloud is thought to occupy a vast space from ~2,000AU (~0.03 ly) to ~ 50,000 AU (0.79 ly) from the Sun. Some estimates place the outer edge at between 100,000 and 200,000 AU (1.58 and 3.16 ly) • Long-period comets come from the Oort Cloud ...
秋 夕(七言絕句) 作者:杜牧 銀燭秋光冷畫屏,輕羅小扇撲流螢。 天階夜色
... The cluster forms the largest structure in our region of the universe. The galaxies are bound to each other by their gravity, so they move through space together. The cluster exerts a strong tug on our own galaxy, the Milky Way, and the small band of galaxies that it's bound to, the Local Group. The ...
... The cluster forms the largest structure in our region of the universe. The galaxies are bound to each other by their gravity, so they move through space together. The cluster exerts a strong tug on our own galaxy, the Milky Way, and the small band of galaxies that it's bound to, the Local Group. The ...
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.