File 11 - School of Astronomy, IPM
... • M87 is Super giant galaxy. • Also known as M87, Virgo A or NGC ...
... • M87 is Super giant galaxy. • Also known as M87, Virgo A or NGC ...
Do non-relativistic neutrinos constitute the dark matter
... •! Needed to explain stability of galaxies •! Needed to explain cosmology ...
... •! Needed to explain stability of galaxies •! Needed to explain cosmology ...
Rich and Poor Galaxy Clusters
... Which of the following is least easily explainable as a result of interaction between galaxies? a) Some galaxies have long "tails" of stars. b) Rich, regular clusters are dominated by central giant ellipticals. c) Both spiral and elliptical galaxies are seen at very high redshift. d) Some galaxies s ...
... Which of the following is least easily explainable as a result of interaction between galaxies? a) Some galaxies have long "tails" of stars. b) Rich, regular clusters are dominated by central giant ellipticals. c) Both spiral and elliptical galaxies are seen at very high redshift. d) Some galaxies s ...
Where are the First Stars now?
... the lower left panel we show where these same stars are at z = 0; the area of each symbol is here proportional to the mass of “first stars” which the corresponding galaxy contains. This can be compared to the plot at upper left which shows the distribution of all the stars at the end of the simulati ...
... the lower left panel we show where these same stars are at z = 0; the area of each symbol is here proportional to the mass of “first stars” which the corresponding galaxy contains. This can be compared to the plot at upper left which shows the distribution of all the stars at the end of the simulati ...
Archaeology of the Milky Way - Max-Planck
... individual stars in detail, in large numbers and in three dimensions,” he says. Fortunately, our Milky Way is a typical galaxy, and what we learn about it can be generalized. Around half the stars in today’s universe are found in galaxies that are similar to our Milky Way in terms of size, mass and ...
... individual stars in detail, in large numbers and in three dimensions,” he says. Fortunately, our Milky Way is a typical galaxy, and what we learn about it can be generalized. Around half the stars in today’s universe are found in galaxies that are similar to our Milky Way in terms of size, mass and ...
Marcolini et al 2006, MNRAS 371, 643 Draco
... metallicity and star formation histories to the galactic globular clusters, but their star formation history is now known to be much more complex. ...
... metallicity and star formation histories to the galactic globular clusters, but their star formation history is now known to be much more complex. ...
Goal: To understand clusters of stars
... • Open clusters are YOUNG clusters that drift apart in about a billion years. • As viewed from Earth you tend to see the blue high mass stars. • Those are always young stars as they don’t last long. • These are clusters with stars of equal age, distance, and composition, but range in mass. ...
... • Open clusters are YOUNG clusters that drift apart in about a billion years. • As viewed from Earth you tend to see the blue high mass stars. • Those are always young stars as they don’t last long. • These are clusters with stars of equal age, distance, and composition, but range in mass. ...
the printable Observing Olympics Object Info Sheet in pdf
... “Knife Edge” or “Splinter” Galaxy. Visually it appears as a very thin high surface brightness streak, notable for not having a central bulge which is typical of most spiral type galaxies. It is also unusual for having a very low metallicity with few detectable giant stars, and is apparently composed ...
... “Knife Edge” or “Splinter” Galaxy. Visually it appears as a very thin high surface brightness streak, notable for not having a central bulge which is typical of most spiral type galaxies. It is also unusual for having a very low metallicity with few detectable giant stars, and is apparently composed ...
Why Aren`t All Galaxies Barred?
... of distances from the centre. This means that the galaxy is rotating differentially, since the stars near the centre take less time to complete one orbit about the centre than those further out. The typical average in the outer parts is 250 km/s, but even at this high speed a star's orbit takes some ...
... of distances from the centre. This means that the galaxy is rotating differentially, since the stars near the centre take less time to complete one orbit about the centre than those further out. The typical average in the outer parts is 250 km/s, but even at this high speed a star's orbit takes some ...
Small galaxies are growing smaller
... his contemporaries believed that the luminosity function (LF) of galaxies, that is the number of galaxies per unit volume of different luminosities, was a peaked, roughly Gaussian shaped curve. Known local galaxies spanned the range from the giant spiral M31 in Andromeda and our own galaxy, with lum ...
... his contemporaries believed that the luminosity function (LF) of galaxies, that is the number of galaxies per unit volume of different luminosities, was a peaked, roughly Gaussian shaped curve. Known local galaxies spanned the range from the giant spiral M31 in Andromeda and our own galaxy, with lum ...
Messier 87
Messier 87 (also known as Virgo A or NGC 4486, and generally abbreviated to M87) is a supergiant elliptical galaxy in the constellation Virgo. One of the most massive galaxies in the local universe, it is notable for its large population of globular clusters—M87 contains about 12,000 compared to the 150-200 orbiting the Milky Way—and its jet of energetic plasma that originates at the core and extends outward at least 1,500 parsecs (4,900 light-years), travelling at relativistic speed. It is one of the brightest radio sources in the sky, and is a popular target for both amateur astronomy observations and professional astronomy study.French astronomer Charles Messier discovered M87 in 1781, cataloguing it as a nebulous feature while searching for objects that would confuse comet hunters. The second brightest galaxy within the northern Virgo Cluster, M87 is located about 16.4 million parsecs (53.5 million light-years) from Earth. Unlike a disk-shaped spiral galaxy, M87 has no distinctive dust lanes. Instead, it has an almost featureless, ellipsoidal shape typical of most giant elliptical galaxies, diminishing in luminosity with distance from the centre. Forming around one sixth of M87's mass, the stars in this galaxy have a nearly spherically symmetric distribution, their density decreasing with increasing distance from the core. At the core is a supermassive black hole, which forms the primary component of an active galactic nucleus. This object is a strong source of multiwavelength radiation, particularly radio waves. M87's galactic envelope extends out to a radius of about 150 kiloparsecs (490,000 light-years), where it has been truncated—possibly by an encounter with another galaxy. Between the stars is a diffuse interstellar medium of gas that has been chemically enriched by elements emitted from evolved stars.