THE INFLUENCE OF ENVIRONMENTAL EFFECTS ON GALAXY
... of the globular cluster population show a double peaked structure, then this can be taken as an indication that the galaxy has been formed from two (or more) distinct components. The diculty with this method is that, since globular clusters are known to be metal poor, it is not possible to unambigu ...
... of the globular cluster population show a double peaked structure, then this can be taken as an indication that the galaxy has been formed from two (or more) distinct components. The diculty with this method is that, since globular clusters are known to be metal poor, it is not possible to unambigu ...
Starburst Galaxies Encyclopedia of Astronomy & Astrophysics eaa.iop.org T Heckman
... luminosity of the starburst. Thus, another way to find starbursts is to search for galaxies with unusually bright emission lines. The dust grains in the starburst are effective at absorbing ultraviolet photons of all wavelengths. The grains are heated by this radiation and cool by emitting radiation ...
... luminosity of the starburst. Thus, another way to find starbursts is to search for galaxies with unusually bright emission lines. The dust grains in the starburst are effective at absorbing ultraviolet photons of all wavelengths. The grains are heated by this radiation and cool by emitting radiation ...
transcript.
... ERIC BECKLIN: This is the signal in the infrared, and each star gives you more signal, and we were building up, as we were getting closer to the center, more and more stars. And we were actually seeing through the dust, for the first time, and then came to a peak, and then back down again, and I kne ...
... ERIC BECKLIN: This is the signal in the infrared, and each star gives you more signal, and we were building up, as we were getting closer to the center, more and more stars. And we were actually seeing through the dust, for the first time, and then came to a peak, and then back down again, and I kne ...
Dwarf Galaxies
... •! Note that compact ellipticals (cE’s) do have similar structural properties to luminous ellipticals. They may have lost their outer portions due to tidal stripping. (e.g., M32 interacting with M31) ...
... •! Note that compact ellipticals (cE’s) do have similar structural properties to luminous ellipticals. They may have lost their outer portions due to tidal stripping. (e.g., M32 interacting with M31) ...
ASTRO-114--Lecture 49-
... in there. And you’ll notice the one over to the right has a similar look. So both of those, the two giant ellipticals that you see there, are cluster dominant combinations of galaxies. So galaxies do collide and they do change. They may have been spiral galaxies when they originally collided, but th ...
... in there. And you’ll notice the one over to the right has a similar look. So both of those, the two giant ellipticals that you see there, are cluster dominant combinations of galaxies. So galaxies do collide and they do change. They may have been spiral galaxies when they originally collided, but th ...
Practical cosmology with the Local Volume galaxies
... dark matter distribution on scales of 0.3 – 3 Mpc. In this respect we note that the sum of virial mass for 7 nearest groups (around the Milky Way, M31, M81, CenA, M83, IC342, and Maffei) consists of 1.3·1013 M☼. But the sum of their total masses estimated via R0 from external galaxy motions is 0.86· ...
... dark matter distribution on scales of 0.3 – 3 Mpc. In this respect we note that the sum of virial mass for 7 nearest groups (around the Milky Way, M31, M81, CenA, M83, IC342, and Maffei) consists of 1.3·1013 M☼. But the sum of their total masses estimated via R0 from external galaxy motions is 0.86· ...
Chapter 14 Black Holes as Central Engines
... The Planck law describes thermal emission, which is characterized by the emission of radiation from a hot gas that is in approximate thermal equilibrium; the resulting spectrum is a blackbody spectrum. The characteristic Planck law curves for thermal emission peak at some wavelength, and fall off ra ...
... The Planck law describes thermal emission, which is characterized by the emission of radiation from a hot gas that is in approximate thermal equilibrium; the resulting spectrum is a blackbody spectrum. The characteristic Planck law curves for thermal emission peak at some wavelength, and fall off ra ...
ULXs: General Properties and Variability - X
... •evidence against beaming (QPOs, broad Fe Lines, eclipses) •At least one object has a break in the PDS at the frequency predicted for M~1000M objects •Associated extended radio sources •General lack of optical Ids (massive stars would be seen) •they lie near, but not in star forming regions Kyoto me ...
... •evidence against beaming (QPOs, broad Fe Lines, eclipses) •At least one object has a break in the PDS at the frequency predicted for M~1000M objects •Associated extended radio sources •General lack of optical Ids (massive stars would be seen) •they lie near, but not in star forming regions Kyoto me ...
ch20
... Star formation can also be triggered by less violent collisions where the galaxies pass very near each other. A galaxy with a bright center produced by vigorous star formation surrounded by clouds of warm interstellar dust is called a starburst galaxy. An example of a starburst galaxy is M82. ...
... Star formation can also be triggered by less violent collisions where the galaxies pass very near each other. A galaxy with a bright center produced by vigorous star formation surrounded by clouds of warm interstellar dust is called a starburst galaxy. An example of a starburst galaxy is M82. ...
Is there a Supermassive Black Hole at the Center of the Milky Way?
... power would require channeling more than 109 stars through a region smaller than the distance between the Sun and the nearest star. Because of these requirements, astronomers began considering a more efficient energy source: a supermassive black hole. The small measured sizes of radio sources at the ...
... power would require channeling more than 109 stars through a region smaller than the distance between the Sun and the nearest star. Because of these requirements, astronomers began considering a more efficient energy source: a supermassive black hole. The small measured sizes of radio sources at the ...
Document
... mostly confined to a thin disk, in which they form a multitude of spiral arms that are entwined with dust lanes. Such stellar systems are wide-spread in the universe, but this has only been known since the beginning of the last century. In the 1920’s, Edwin Hubble discovered that some of the nebular ...
... mostly confined to a thin disk, in which they form a multitude of spiral arms that are entwined with dust lanes. Such stellar systems are wide-spread in the universe, but this has only been known since the beginning of the last century. In the 1920’s, Edwin Hubble discovered that some of the nebular ...
Next Generation VLA Science White Paper
... with ALMA (Meier et al. 2015). The figure displays the spectral line data as if it were taken with an optical spectrograph oriented along the major axis of the nuclear bar. The horizontal axis is position and the vertical axis is frequency. The resolution ...
... with ALMA (Meier et al. 2015). The figure displays the spectral line data as if it were taken with an optical spectrograph oriented along the major axis of the nuclear bar. The horizontal axis is position and the vertical axis is frequency. The resolution ...
GRB 990123 - University of Iowa Astrophysics
... before merger and binaries have non-zero speeds due to kicks in compact object formation. Thus, GRBs can occur in outskirts of or even far from host galaxy. ...
... before merger and binaries have non-zero speeds due to kicks in compact object formation. Thus, GRBs can occur in outskirts of or even far from host galaxy. ...
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.