Clusters as laboratories for the study of galaxy evolution
... may become as useful as star clusters are in the study of stellar evolution” -- Dressler, 1984 Annual Reviews Back in 1984, (and still?) the prevalent view was that clusters were themselves agents that influenced the evolution of galaxies, so that the processes that produced different morphological ...
... may become as useful as star clusters are in the study of stellar evolution” -- Dressler, 1984 Annual Reviews Back in 1984, (and still?) the prevalent view was that clusters were themselves agents that influenced the evolution of galaxies, so that the processes that produced different morphological ...
Chapter 31
... is not clearly understood. • There are two different theories about how the arms are maintained: 1. Spiral density waves, which can be thought of alternating dense and less-dense regions that are frozen in place and rotate as a rigid pattern, cause a buildup of material as they move through space. 2 ...
... is not clearly understood. • There are two different theories about how the arms are maintained: 1. Spiral density waves, which can be thought of alternating dense and less-dense regions that are frozen in place and rotate as a rigid pattern, cause a buildup of material as they move through space. 2 ...
Course Outline - Tony Bacigalupo
... populated with stars at the center of the Galaxy The interstellar medium blocks our view of the center The center of the Galaxy is in the direction of Sagittarius ...
... populated with stars at the center of the Galaxy The interstellar medium blocks our view of the center The center of the Galaxy is in the direction of Sagittarius ...
Hertzsprung Rusell Diagram KLT
... Stars that look to us as though they are near each other, may intact be very far away from each other. Distant but very bright stars look similar to close but dim stars. ...
... Stars that look to us as though they are near each other, may intact be very far away from each other. Distant but very bright stars look similar to close but dim stars. ...
Black Holes in Binary Systems and Galaxy Nuclei
... Mean mass of the BH is ~9 MSun. None of this 26 BH candidates is X-ray pulsar, radiopulsar or X-ray burster of the first kind. Therefore none of these massive (mx > 3 MSun) compact objects shows the evidence of observed surface in agreement with the predictions of the Einstein General Relativity (!) ...
... Mean mass of the BH is ~9 MSun. None of this 26 BH candidates is X-ray pulsar, radiopulsar or X-ray burster of the first kind. Therefore none of these massive (mx > 3 MSun) compact objects shows the evidence of observed surface in agreement with the predictions of the Einstein General Relativity (!) ...
Part I: Shining a Light on Visual Magnitude
... of capabilities and we will cover a sliver of them for this analysis, specifically features related to measuring the visual magnitude of stars. We need to first understand visual magnitude (vMag). When a telescope or sensor looks up at the sky, the brightness of the objects it’s looking at is called ...
... of capabilities and we will cover a sliver of them for this analysis, specifically features related to measuring the visual magnitude of stars. We need to first understand visual magnitude (vMag). When a telescope or sensor looks up at the sky, the brightness of the objects it’s looking at is called ...
Constellation Catalog
... east at sunset, reaches its highest point in the sky at midnight and sets in the west at sunrise. November and December are especially good months for viewing Aries the Ram in all his starlit majesty, for this constellation shines above the eastern horizon at nightfall and stays out for most of the ...
... east at sunset, reaches its highest point in the sky at midnight and sets in the west at sunrise. November and December are especially good months for viewing Aries the Ram in all his starlit majesty, for this constellation shines above the eastern horizon at nightfall and stays out for most of the ...
The Gaseous Halo of NGC 891 Edmund Hodges-Kluck Joel Bregman
... • Bregman+2013 find ~Z in quasar absorption lines with an impact parameter of 5 kpc • We also developed a new method to constrain Z in an imaging sense using dust-scattered light • Halos are dusty (Menard+2010); dust visible in: • Emission (mid-IR; sky is bright; stars) ...
... • Bregman+2013 find ~Z in quasar absorption lines with an impact parameter of 5 kpc • We also developed a new method to constrain Z in an imaging sense using dust-scattered light • Halos are dusty (Menard+2010); dust visible in: • Emission (mid-IR; sky is bright; stars) ...
Planetary Nebula
... and fainter, smooth, circular outer envelope. The Lemon slice nebula is one of the most simple nebulae known, with an almost perfectly spherical shape. It appears very similar to a lemon for which it is named. The central star is a very hot and bright Red Giant, and can be seen as a red-orange hue. ...
... and fainter, smooth, circular outer envelope. The Lemon slice nebula is one of the most simple nebulae known, with an almost perfectly spherical shape. It appears very similar to a lemon for which it is named. The central star is a very hot and bright Red Giant, and can be seen as a red-orange hue. ...
Observational properties of stars
... you and the stars you are looking at. This value is different for all stars. Stars in groups or clusters usually have a similar amount of dust blocking their light, but if you are looking at individual stars scattered about the galaxy, you could be looking through either a large amount or a small am ...
... you and the stars you are looking at. This value is different for all stars. Stars in groups or clusters usually have a similar amount of dust blocking their light, but if you are looking at individual stars scattered about the galaxy, you could be looking through either a large amount or a small am ...
Constraining the star formation histories of spiral bulges
... suggested (Blum, Sellgren & Depoy 1996; Frogel 1998). These observations suggest that the population of the bulge of our own Galaxy has a complex and extended SFH. Our long-slit observations of spiral bulges allow comparison of central line strengths and gradients to those in other galaxy types and ...
... suggested (Blum, Sellgren & Depoy 1996; Frogel 1998). These observations suggest that the population of the bulge of our own Galaxy has a complex and extended SFH. Our long-slit observations of spiral bulges allow comparison of central line strengths and gradients to those in other galaxy types and ...
Constellation Detection
... missing or out of frame; we set the matching threshold NUM_MATCH to be half of the total star numbers in the constellation template. If the matching number is above the threshold, we decide the constellation is detected in the test image. Finding the proper scale of the template improves the accurac ...
... missing or out of frame; we set the matching threshold NUM_MATCH to be half of the total star numbers in the constellation template. If the matching number is above the threshold, we decide the constellation is detected in the test image. Finding the proper scale of the template improves the accurac ...
dark matter - University of Texas Astronomy Home Page
... 1. One way to estimate the amount of mass in a spiral galaxy is by looking at how much light it emits. Where there is more light, there must be more stars and hence more mass. When we measure amount of light at different regions in the galaxy, more is emitted at the center and less on the outskirts. ...
... 1. One way to estimate the amount of mass in a spiral galaxy is by looking at how much light it emits. Where there is more light, there must be more stars and hence more mass. When we measure amount of light at different regions in the galaxy, more is emitted at the center and less on the outskirts. ...
chapter17StarStuff
... ends with a pulse that ejects the H and He into space as a planetary nebula • The core left behind becomes a white dwarf • Hourglass Nebula, MyCn18 • http://en.wikipedia.org/ wiki/Hourglass_Nebula ...
... ends with a pulse that ejects the H and He into space as a planetary nebula • The core left behind becomes a white dwarf • Hourglass Nebula, MyCn18 • http://en.wikipedia.org/ wiki/Hourglass_Nebula ...
Baryons at Low Densities: The Stellar Halos around Galaxies
... was largely built from one, or a few, relatively massive (> 109 MA) accretion events, but at large radii many low-mass accretions have contributed to the recent buildup of the halo. The kinematics of the inner halo stars is however consistent with their origin from the disc — these stars were likely ...
... was largely built from one, or a few, relatively massive (> 109 MA) accretion events, but at large radii many low-mass accretions have contributed to the recent buildup of the halo. The kinematics of the inner halo stars is however consistent with their origin from the disc — these stars were likely ...
Stars and Galaxies - Red Hook Central Schools
... http://hubblesite.org/newscenter/archive/releases/star%20cluster/globular/2007/18/image/a/format/web/results/50/ ...
... http://hubblesite.org/newscenter/archive/releases/star%20cluster/globular/2007/18/image/a/format/web/results/50/ ...
Curiosities of the Sky
... on the imagination and suggest that the stars had been thrown into a vast eddy, or system of eddies, whose vortices appear as dark holes. Only a maelstrom-like motion could keep such a funnel open, for without regard to the impulse derived from the projectile, the proper motions of the stars themse ...
... on the imagination and suggest that the stars had been thrown into a vast eddy, or system of eddies, whose vortices appear as dark holes. Only a maelstrom-like motion could keep such a funnel open, for without regard to the impulse derived from the projectile, the proper motions of the stars themse ...
Stellar Evolution : The Life and Death of Our Luminous Neighbors
... e. they are all so far away that the light hasn't reached us yet. 2. The nuclear reactions in a star's core remain under control so long as a. b. c. d. ...
... e. they are all so far away that the light hasn't reached us yet. 2. The nuclear reactions in a star's core remain under control so long as a. b. c. d. ...
The Official Magazine of the University Of St Andrews Astronomical Society 1
... check out The Double Cluster ( NGC 869 and NGC 884), two open clusters right next to each other between the top of Perseus and Cassiopeia. Then there’s M34, another open cluster that’s 1400 light years away, but you’ll find this one just above Medusa’s head. The star Algol (aka Beta Persei) is an ec ...
... check out The Double Cluster ( NGC 869 and NGC 884), two open clusters right next to each other between the top of Perseus and Cassiopeia. Then there’s M34, another open cluster that’s 1400 light years away, but you’ll find this one just above Medusa’s head. The star Algol (aka Beta Persei) is an ec ...
The Birth of a Supernova Seen in Real Time
... Twenty days after the outburst, the radio emission peaked at 8.46 GHz with radio spectral luminosity of 1027 erg s-1 Hz-1, a factor of 104 lower than those of typical GRB afterglows, but comparable to the radio luminosities observed for nearby core-collapse SNe. Based on our modeling of the temporal ...
... Twenty days after the outburst, the radio emission peaked at 8.46 GHz with radio spectral luminosity of 1027 erg s-1 Hz-1, a factor of 104 lower than those of typical GRB afterglows, but comparable to the radio luminosities observed for nearby core-collapse SNe. Based on our modeling of the temporal ...
1. The catalogue structure
... the following famed researchers: Peters, Bailey, Schjellerup, Pierce and Manitius. Different identifications of certain Almagest stars on the celestial sphere of our epoch suggested by said astronomers are also indicated. We have partially processed this enormous body of material. First of all, it i ...
... the following famed researchers: Peters, Bailey, Schjellerup, Pierce and Manitius. Different identifications of certain Almagest stars on the celestial sphere of our epoch suggested by said astronomers are also indicated. We have partially processed this enormous body of material. First of all, it i ...
A Star - Cloudy Nights
... All the stars you can see without a telescope, including our Sun, are located in the same spiral arm of the Milky Way galaxy. Even though these stars are our neighbors, we can't visit them. They are too far away. Using current technology, it would take thousands of years to travel to our closest ste ...
... All the stars you can see without a telescope, including our Sun, are located in the same spiral arm of the Milky Way galaxy. Even though these stars are our neighbors, we can't visit them. They are too far away. Using current technology, it would take thousands of years to travel to our closest ste ...
A historical perspective on the discovery of neutron stars
... Actually very small number of pulsars have been found in a supernova remnant (SNR). SNR could contain a neutron star which is not seen as a pulsar because the radiation beam does not intersect the line of sight (CCO). Pulsars can live much longer than the SNR where they are formed (pulsar lifetime ∼ ...
... Actually very small number of pulsars have been found in a supernova remnant (SNR). SNR could contain a neutron star which is not seen as a pulsar because the radiation beam does not intersect the line of sight (CCO). Pulsars can live much longer than the SNR where they are formed (pulsar lifetime ∼ ...
A Spectroscopically Confirmed Excess of 24 micron Sources in a
... (log(LIR )[erg s−1 ]> 45) not found in galaxy clusters at z . 0.35; and 3) there is a strong trend of decreasing 24µm fraction with increasing galaxy density, i.e. an infrared-density relation, not observed in the cluster. These dramatic differences are surprising because the early-type fraction in ...
... (log(LIR )[erg s−1 ]> 45) not found in galaxy clusters at z . 0.35; and 3) there is a strong trend of decreasing 24µm fraction with increasing galaxy density, i.e. an infrared-density relation, not observed in the cluster. These dramatic differences are surprising because the early-type fraction in ...
Serpens
Serpens (""the Serpent"", Greek Ὄφις) is a constellation of the northern hemisphere. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations defined by the International Astronomical Union. It is unique among the modern constellations in being split into two non-contiguous parts, Serpens Caput (Serpent's Head) to the west and Serpens Cauda (Serpent's Tail) to the east. Between these two halves lies the constellation of Ophiuchus, the ""Serpent-Bearer"". In figurative representations, the body of the serpent is represented as passing behind Ophiuchus between Mu Serpentis in Serpens Caput and Nu Serpentis in Serpens Cauda.The brightest star in Serpens is the red giant star Alpha Serpentis, or Unukalhai, in Serpens Caput, with an apparent magnitude of 2.63. Also located in Serpens Caput are the naked-eye globular cluster Messier 5 and the naked-eye variables R Serpentis and Tau4 Serpentis. Notable extragalactic objects include Seyfert's Sextet, one of the densest galaxy clusters known; Arp 220, the prototypical ultraluminous infrared galaxy; and Hoag's Object, the most famous of the very rare class of galaxies known as ring galaxies.Part of the Milky Way's galactic plane passes through Serpens Cauda, which is therefore rich in galactic deep-sky objects, such as the Eagle Nebula (IC 4703) and its associated star cluster Messier 16. The nebula measures 70 light-years by 50 light-years and contains the Pillars of Creation, three dust clouds that became famous for the image taken by the Hubble Space Telescope. Other striking objects include the Red Square Nebula, one of the few objects in astronomy to take on a square shape; and Westerhout 40, a massive nearby star-forming region consisting of a molecular cloud and an H II region.