A Universe of Galaxies
... “stars” that were very bright at radio wavelengths (normal stars do not produce much radio emission). They were named quasi-stellar radio sources (quasars): ...
... “stars” that were very bright at radio wavelengths (normal stars do not produce much radio emission). They were named quasi-stellar radio sources (quasars): ...
The Moon
... other large galaxies like ours, but there are a few small galaxies. Other large galaxies would be more than a meter away. The next closest galaxy is actually 2.5 meters away, about 2.5 million light years. ...
... other large galaxies like ours, but there are a few small galaxies. Other large galaxies would be more than a meter away. The next closest galaxy is actually 2.5 meters away, about 2.5 million light years. ...
Lecture 4
... If we assume a constant SFR with time, sSFR scales as the inverse of the age of the galaxy. In the nearby universe the sSFR decreases when stellar mass increases, massive galaxies formed their stars in the past whereas less massive ones are still quite active in star formation, or equivalently, the ...
... If we assume a constant SFR with time, sSFR scales as the inverse of the age of the galaxy. In the nearby universe the sSFR decreases when stellar mass increases, massive galaxies formed their stars in the past whereas less massive ones are still quite active in star formation, or equivalently, the ...
The Guide to the Galaxies
... 1936, invented a system for their classification. The Hubble scheme is a morphological classification scheme for galaxies that divides them ...
... 1936, invented a system for their classification. The Hubble scheme is a morphological classification scheme for galaxies that divides them ...
GEARS Workshop Monday
... • Are ellipticals and spirals different in make up – or just different shapes? • We are going to compare and contrast some important features of ellipticals and spirals by using light at different wavelengths. • Hydrogen gas, has a ‘spin-flip’ electronic energy transition which is very rare and the ...
... • Are ellipticals and spirals different in make up – or just different shapes? • We are going to compare and contrast some important features of ellipticals and spirals by using light at different wavelengths. • Hydrogen gas, has a ‘spin-flip’ electronic energy transition which is very rare and the ...
Large Scale Structure of the Universe
... a view of the structure of the Universe in three-dimensions. You might speculate that an image of this structure could be determined by photographing stars to see if they form some kind of pattern. An example of a star is our own Sun. Although the Sun is extremely bright for earth’s inhabitants, it ...
... a view of the structure of the Universe in three-dimensions. You might speculate that an image of this structure could be determined by photographing stars to see if they form some kind of pattern. An example of a star is our own Sun. Although the Sun is extremely bright for earth’s inhabitants, it ...
Moons, Planets, Solar System, Stars, Galaxies, in our Universe
... We don t have enough data to figure out where we are within the UNIVERSE nor how big our Universe might be…evidence is it s expanding! n We are a member of a cluster and a supercluster of galaxies. How do we know that? n If you leave from a place, how far could you travel in a given amount of ti ...
... We don t have enough data to figure out where we are within the UNIVERSE nor how big our Universe might be…evidence is it s expanding! n We are a member of a cluster and a supercluster of galaxies. How do we know that? n If you leave from a place, how far could you travel in a given amount of ti ...
Genome Landscapes and Bacteriophage Codon Usage
... mined for further information about these dust-enshrouded galaxies, to give a better understanding of their evolutionary history, any relationship with other galaxies, and associations with larger-scale structures in the Universe. These results also provide catalogs of luminous submillimeter sources ...
... mined for further information about these dust-enshrouded galaxies, to give a better understanding of their evolutionary history, any relationship with other galaxies, and associations with larger-scale structures in the Universe. These results also provide catalogs of luminous submillimeter sources ...
Star-Formation in Close Pairs Selected from the Sloan Digital Sky
... Star formation rates (SFRs) for the volume-limited sample have been calculated from aperture corrected Hα luminosities and, where available, IRAS data. Specific star formation rates (SSFRs) were calculated by estimating galaxy masses from z-band luminosities. The r-band inverse concentration index w ...
... Star formation rates (SFRs) for the volume-limited sample have been calculated from aperture corrected Hα luminosities and, where available, IRAS data. Specific star formation rates (SSFRs) were calculated by estimating galaxy masses from z-band luminosities. The r-band inverse concentration index w ...
23.cosmology-student
... The only possible object that fits the evidence is a supermassive back hole. – Observations of stars and gas clouds orbiting at the centers of galaxies indicate that many galaxies, and perhaps all of them, have supermassive black holes ...
... The only possible object that fits the evidence is a supermassive back hole. – Observations of stars and gas clouds orbiting at the centers of galaxies indicate that many galaxies, and perhaps all of them, have supermassive black holes ...
homework_chap._17__19
... . One of the important numbers in determining how many extraterrestrial civilizations there may be at the present time in the Milky Way Galaxy is the following: Out of the stars that have planets, what fraction, fs, has planets suitable for life? (This number is similar to the number ne in the Dra ...
... . One of the important numbers in determining how many extraterrestrial civilizations there may be at the present time in the Milky Way Galaxy is the following: Out of the stars that have planets, what fraction, fs, has planets suitable for life? (This number is similar to the number ne in the Dra ...
25.2 Stellar Evolution
... The Milky Way is a large spiral galaxy whose disk is about 100,000 light-years wide and about 10,000 light-years thick at the nucleus, as shown in Figure 17A. Our solar system orbits the galactic ...
... The Milky Way is a large spiral galaxy whose disk is about 100,000 light-years wide and about 10,000 light-years thick at the nucleus, as shown in Figure 17A. Our solar system orbits the galactic ...
7.2 Galaxies
... Some galaxies are neither spiral nor elliptical. Those without a regular shape are called irregular galaxies. The distorted form of an irregular galaxy may result because the galaxy collided with another one or got close enough that the gravitational force from the other galaxy drew stars away. ...
... Some galaxies are neither spiral nor elliptical. Those without a regular shape are called irregular galaxies. The distorted form of an irregular galaxy may result because the galaxy collided with another one or got close enough that the gravitational force from the other galaxy drew stars away. ...
Viewing the Universe - Horace Mann Webmail
... electromagnetic radiation, or energy that can travel through space in the form of waves. ...
... electromagnetic radiation, or energy that can travel through space in the form of waves. ...
Star Clusters, Galaxies, & Black Holes
... Stars do not occur in space at completely arbitrary places. Some, such as the Sun, are single (field star), but others are members of pairs or form multiple-star systems. Still others form clusters of various types, and size. All of them are condensed from clouds of gas and dust. ...
... Stars do not occur in space at completely arbitrary places. Some, such as the Sun, are single (field star), but others are members of pairs or form multiple-star systems. Still others form clusters of various types, and size. All of them are condensed from clouds of gas and dust. ...
Linear optics quantum logic gates in the real world
... universe might be in low surface brightness galaxies know as “Dark Galaxies” HIPASS being a HI All-sky southern survey should find “Dark Galaxies” if they exist Dark Galaxies in HIPASS HI strongly detected but no possible optical counterpart found. We have found 3 candidate Dark Galaxies Will b ...
... universe might be in low surface brightness galaxies know as “Dark Galaxies” HIPASS being a HI All-sky southern survey should find “Dark Galaxies” if they exist Dark Galaxies in HIPASS HI strongly detected but no possible optical counterpart found. We have found 3 candidate Dark Galaxies Will b ...
v = H o χ d “Hubble`s Law”
... • Only synchrotron radiation is bright at both radio and X-ray wavelengths (far ends of the spectrum) ...
... • Only synchrotron radiation is bright at both radio and X-ray wavelengths (far ends of the spectrum) ...
Poster - Arkansas Center for Space and Planetary Sciences
... cluster that is confirmed by recent literature. When comparing the pitch angle of galaxies in & out of clustered regions, there seems to be little to no difference, suggesting no environmental effect of clusters on pitch angle. ...
... cluster that is confirmed by recent literature. When comparing the pitch angle of galaxies in & out of clustered regions, there seems to be little to no difference, suggesting no environmental effect of clusters on pitch angle. ...
PH607lec12-3gal1
... In barred S0 galaxies the bar is often the only structure visible in the disc. In types SBa and later the bar often connects to a spiral pattern extending to larger radii (e.g. NGC 1300). Viewed face-on, bars typically appear to have axial ratios of 2. The surface brightness within the bar is often ...
... In barred S0 galaxies the bar is often the only structure visible in the disc. In types SBa and later the bar often connects to a spiral pattern extending to larger radii (e.g. NGC 1300). Viewed face-on, bars typically appear to have axial ratios of 2. The surface brightness within the bar is often ...
Lecture 32 Quasars
... • Jets and high velocities formed by magnetic field squirting gas out the poles before it is swallowed (like star formation jets) • Can account for different types of AGN's by – how much matter is being ingested – accretion disk is surrounded by obscuring disk, type depends on the viewing angle (eg: ...
... • Jets and high velocities formed by magnetic field squirting gas out the poles before it is swallowed (like star formation jets) • Can account for different types of AGN's by – how much matter is being ingested – accretion disk is surrounded by obscuring disk, type depends on the viewing angle (eg: ...
Seyfert galaxy
Seyfert galaxies are one of the two largest groups of active galaxies, along with quasars. They have quasar-like nuclei (very luminous, distant and bright sources of electromagnetic radiation) with very high surface brightnesses whose spectra reveal strong, high-ionisation emission lines, but unlike quasars, their host galaxies are clearly detectable.Seyfert galaxies account for about 10% of all galaxies and are some of the most intensely studied objects in astronomy, as they are thought to be powered by the same phenomena that occur in quasars, although they are closer and less luminous than quasars. These galaxies have supermassive black holes at their centers which are surrounded by accretion discs of in-falling material. The accretion discs are believed to be the source of the observed ultraviolet radiation. Ultraviolet emission and absorption lines provide the best diagnostics for the composition of the surrounding material.Seen in visible light, most Seyfert galaxies look like normal spiral galaxies, but when studied under other wavelengths, it becomes clear that the luminosity of their cores is of comparable intensity to the luminosity of whole galaxies the size of the Milky Way.Seyfert galaxies are named after Carl Seyfert, who first described this class in 1943.