The Diverse Galaxies
... Measuring distant objects more than 100 millions of light-years (100 Mly) requires an even more luminous object Sometime large galaxies can be used as standard candles The white dwarf supernovae is a very consistent since 1.4 solar masses (the Chandrasekar limit) is always exploding. ...
... Measuring distant objects more than 100 millions of light-years (100 Mly) requires an even more luminous object Sometime large galaxies can be used as standard candles The white dwarf supernovae is a very consistent since 1.4 solar masses (the Chandrasekar limit) is always exploding. ...
Dust and Stellar Emission of Nearby Galaxies in the KINGFISH
... We exploit data from the UV to submillimeter wavelengths of a heterogeneous sample of 62 galaxies from the KINGFISH project (Key Insights on Nearby Galaxies: a Far-Infrared Survey with Herschel), to empirically study the emission from stars and dust in these galaxies. We use the spectral energy dist ...
... We exploit data from the UV to submillimeter wavelengths of a heterogeneous sample of 62 galaxies from the KINGFISH project (Key Insights on Nearby Galaxies: a Far-Infrared Survey with Herschel), to empirically study the emission from stars and dust in these galaxies. We use the spectral energy dist ...
Abundance anomalies in globular cluster (GC) stars
... • Previously, the most popular site* for this is at the base of the convective envelope in AGB stars - Hot Bottom Burning • And now, maybe winds from massive stars (WMS) ...
... • Previously, the most popular site* for this is at the base of the convective envelope in AGB stars - Hot Bottom Burning • And now, maybe winds from massive stars (WMS) ...
ROTATION CURVES OF HIGH-LUMINOSITY SPIRAL GALAXIES
... Current values of 0ort s constants are A = 15.6±2.8, B = -11.4±2.8 km/s per kpc (Fricke and Tsioumis 1975), although 0-B2 stars produce values as discrepant as A = +26, B = -37 (Asteriadis, 1977). At the la level, A = -B is not excluded, i.e., the rotation curve could be flat in the solar vicinity. ...
... Current values of 0ort s constants are A = 15.6±2.8, B = -11.4±2.8 km/s per kpc (Fricke and Tsioumis 1975), although 0-B2 stars produce values as discrepant as A = +26, B = -37 (Asteriadis, 1977). At the la level, A = -B is not excluded, i.e., the rotation curve could be flat in the solar vicinity. ...
Pretty Pictures of the Cosmos
... layers of a Sun-like star only 10,000 years ago. The inner filaments visible are being ejected by strong wind of particles from the central star. The outer disk contains unusual light-year long orange filaments. The Eskimo Nebula lies about 5000 light-years away in the constellation of Gemini. ...
... layers of a Sun-like star only 10,000 years ago. The inner filaments visible are being ejected by strong wind of particles from the central star. The outer disk contains unusual light-year long orange filaments. The Eskimo Nebula lies about 5000 light-years away in the constellation of Gemini. ...
1 Introduction - Wiley-VCH
... emission processes are tightly related to recent star formation events and have a relative weight that changes with λ, where the free–free emissions is being important at short wavelengths while synchrotron dominating at long wavelengths. The accretion phenomenon on a compact source in binary system ...
... emission processes are tightly related to recent star formation events and have a relative weight that changes with λ, where the free–free emissions is being important at short wavelengths while synchrotron dominating at long wavelengths. The accretion phenomenon on a compact source in binary system ...
What are Messier Objects? - Bowling Green State University
... cluster in Orion. Also known as the Orion Nebula. Is one of the brightest starforming nebulae and one of the brightest diffusion nebulae in the sky It is a big object, considered to cover four times the area of the full moon. Located 1,600 light years away. Is a very turbulent cloud of gas ...
... cluster in Orion. Also known as the Orion Nebula. Is one of the brightest starforming nebulae and one of the brightest diffusion nebulae in the sky It is a big object, considered to cover four times the area of the full moon. Located 1,600 light years away. Is a very turbulent cloud of gas ...
GRB jets and their interaction with the progenitor star
... 10o and =10 is propagated through polytropic stars of varying mass and radius. The break-out time depends very mildly on the mass, so too the energy deposited into the star ...
... 10o and =10 is propagated through polytropic stars of varying mass and radius. The break-out time depends very mildly on the mass, so too the energy deposited into the star ...
Document
... • The requirement of uniform average density implies that for large distances there should be 7x as many galaxies within the outer shell inside the same solid angle as the inner shell. • Apparent brightness scales as the inverse square. • Assumed “luminosity evolution” of quasars makes far ones much ...
... • The requirement of uniform average density implies that for large distances there should be 7x as many galaxies within the outer shell inside the same solid angle as the inner shell. • Apparent brightness scales as the inverse square. • Assumed “luminosity evolution” of quasars makes far ones much ...
Magnetic Fields in Lensing Elliptical Galaxies D. Narasimha1, S. M.
... Case Study: 0957+561 The first lens system, Q0957+561 has two images of a background quasar lensed by an Elliptical Galaxy and a Galaxy–Cluster at redhsift of 0.36 Extended highly polarized emission by a ∼10” feature along Image A only. Both the AGN core and extended features are polarized in radi ...
... Case Study: 0957+561 The first lens system, Q0957+561 has two images of a background quasar lensed by an Elliptical Galaxy and a Galaxy–Cluster at redhsift of 0.36 Extended highly polarized emission by a ∼10” feature along Image A only. Both the AGN core and extended features are polarized in radi ...
The Hubble Law - Department of Astronomy
... being carried along by the expansion of space itself) will have its radiation (light) shifted in wavelength. For velocities much smaller than the speed of light, we can use the regular Doppler formula: λ measured wavelength λο rest (laboratory) wavelength v velocity c speed of light The quantity on ...
... being carried along by the expansion of space itself) will have its radiation (light) shifted in wavelength. For velocities much smaller than the speed of light, we can use the regular Doppler formula: λ measured wavelength λο rest (laboratory) wavelength v velocity c speed of light The quantity on ...
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.