The Diverse Galaxies
... Active Galaxies An active galaxy is a galaxy with an unusually luminous nucleus. Three main types of active galaxies: ...
... Active Galaxies An active galaxy is a galaxy with an unusually luminous nucleus. Three main types of active galaxies: ...
Gravitational lensing evidence against extended dark matter halos
... The main goal of the present paper is to test the hypothesis that early-type lens galaxies are embedded in extended dark matter halos, as are generally found around spiral galaxies. The constancy of the M/LH ratio as a function of radius provides evidence against that hypothesis. For further illustr ...
... The main goal of the present paper is to test the hypothesis that early-type lens galaxies are embedded in extended dark matter halos, as are generally found around spiral galaxies. The constancy of the M/LH ratio as a function of radius provides evidence against that hypothesis. For further illustr ...
PowerPoint Lecture - UCSD Department of Physics
... features (from specific atoms) that serve as wavelength references • These features get pushed out toward the red the farther away they are • To the left are spectra of quasars (galaxies with active black holes) at a variety of redshifts – spectral features here are primarily from hydrogen and oxyge ...
... features (from specific atoms) that serve as wavelength references • These features get pushed out toward the red the farther away they are • To the left are spectra of quasars (galaxies with active black holes) at a variety of redshifts – spectral features here are primarily from hydrogen and oxyge ...
Power Point
... contains significantly more HI gas than observed in similar nearby clusters • however the galaxies in regions of higher density within Abell 370 have less gas than galaxies located in regions of lower density, the same trend seen in nearby galaxy clusters ...
... contains significantly more HI gas than observed in similar nearby clusters • however the galaxies in regions of higher density within Abell 370 have less gas than galaxies located in regions of lower density, the same trend seen in nearby galaxy clusters ...
Type Ia - University of Texas Astronomy Home Page
... Expelled outer hydrogen envelope has been difficult to detect directly, but is inferred. Cas A was probably something else with a very thin layer of Hydrogen (next topic), ...
... Expelled outer hydrogen envelope has been difficult to detect directly, but is inferred. Cas A was probably something else with a very thin layer of Hydrogen (next topic), ...
Nbody
... King model. Cluster starts at 4pc from galactic center but spirals in. 1 orbit = 105 yrs. Notice the star colors in the tidal tails; these researchers include stellar evolution with dynamics! ...
... King model. Cluster starts at 4pc from galactic center but spirals in. 1 orbit = 105 yrs. Notice the star colors in the tidal tails; these researchers include stellar evolution with dynamics! ...
Embryology of Elliptical Galaxies
... The total mass of gaseous matter is assumed to be 1.3×1010 M initially. Following a standard scenario of the ΛCDM universe (ΩM = 0.3, ΩΛ = 0.7, Ωb = 0.04, and a Hubble constant of H0 = 70 km s-1 Mpc-1), we consider a proto-galaxy originating from a CDM density fluctuation with δM/M equal to ν times ...
... The total mass of gaseous matter is assumed to be 1.3×1010 M initially. Following a standard scenario of the ΛCDM universe (ΩM = 0.3, ΩΛ = 0.7, Ωb = 0.04, and a Hubble constant of H0 = 70 km s-1 Mpc-1), we consider a proto-galaxy originating from a CDM density fluctuation with δM/M equal to ν times ...
Redshift - drvee.com
... VINTAGE VERSION: Spectra recorded on photographic plates. These spectra show shifts in a hydrogen line compared to the laboratory (at rest) spectrum. MODERN VERSION: Fiber optic scanning and full digital spectrum plots (from the Sloan Sky Survey) ...
... VINTAGE VERSION: Spectra recorded on photographic plates. These spectra show shifts in a hydrogen line compared to the laboratory (at rest) spectrum. MODERN VERSION: Fiber optic scanning and full digital spectrum plots (from the Sloan Sky Survey) ...
Power Point
... • coadd weak HI signals isolated in position & redshift (velocity) space • measure integrated HI signal – total HI mass of whole galaxy population – can calculate the average HI galaxy mass ...
... • coadd weak HI signals isolated in position & redshift (velocity) space • measure integrated HI signal – total HI mass of whole galaxy population – can calculate the average HI galaxy mass ...
Galaxy Images - Institute of Physics
... which the galaxies reside (in the constellation Fornax), is just one-tenth the diameter of the full Moon (about the size of a grain of sand held at arms length) and is largely empty as seen with the naked eye. This is a "deep" core sample of the universe, cutting across billions of lightyears. The s ...
... which the galaxies reside (in the constellation Fornax), is just one-tenth the diameter of the full Moon (about the size of a grain of sand held at arms length) and is largely empty as seen with the naked eye. This is a "deep" core sample of the universe, cutting across billions of lightyears. The s ...
Accreting Supermassive Black Holes and their
... The sky in black holes, > 10^7 solar mass. Aitoff projection in galactic coordinates of 5,978 candidate sources in the case of a complete sub sample (the Galactic plane remains obscured). The choice was made from a complete sample of 10,284 candidate brighter than 0.03 Jy at 2 micron, and selected ...
... The sky in black holes, > 10^7 solar mass. Aitoff projection in galactic coordinates of 5,978 candidate sources in the case of a complete sub sample (the Galactic plane remains obscured). The choice was made from a complete sample of 10,284 candidate brighter than 0.03 Jy at 2 micron, and selected ...
THE CIRCINUS GALAXY - Observation and Data Reduction with the
... • The emitting region, derived assuming a Gaussian distribution centered at the galaxy core, seems to have a single size component for wavelengths from 8 up to 9.2 m, and come from more extended regions for longer ...
... • The emitting region, derived assuming a Gaussian distribution centered at the galaxy core, seems to have a single size component for wavelengths from 8 up to 9.2 m, and come from more extended regions for longer ...
HST Frontier Fields - HubbleSOURCE
... Galaxies grew in size and mass over this time, and changed their shapes from irregular to smooth ...
... Galaxies grew in size and mass over this time, and changed their shapes from irregular to smooth ...
Time From the Perspective of a Particle Physicist
... mass doesn’t match observed amount of matter unseen “dark matter” unknown composition extends beyond visible part of Milky Way observed in other Galaxies (1960-1970). Vera Rubin pioneered though no Nobel Prize as (partially) she wasn’t a male (she was first female allowed to use some telescopes) ...
... mass doesn’t match observed amount of matter unseen “dark matter” unknown composition extends beyond visible part of Milky Way observed in other Galaxies (1960-1970). Vera Rubin pioneered though no Nobel Prize as (partially) she wasn’t a male (she was first female allowed to use some telescopes) ...
here
... - Biasing from an observational point of view • The VVDS survey of the LSS at high z - A new method to measure biasing - Results : biasing properties up to z=1.5 • Cosmological implication of our results - Test of the Gravitational Instability Paradigm ...
... - Biasing from an observational point of view • The VVDS survey of the LSS at high z - A new method to measure biasing - Results : biasing properties up to z=1.5 • Cosmological implication of our results - Test of the Gravitational Instability Paradigm ...
feedback - University of Massachusetts Amherst
... with the stellar feedback • Evolution of both dark and baryon matters (with the final mass 1012 Msun) • Initial bulge formation (5x1010 Msun) starburst shock-heating and expanding of gas • Later Type Ia SNe bulge wind/outflow, maintaining a low-density high-T halo, preventing a cooling flow ...
... with the stellar feedback • Evolution of both dark and baryon matters (with the final mass 1012 Msun) • Initial bulge formation (5x1010 Msun) starburst shock-heating and expanding of gas • Later Type Ia SNe bulge wind/outflow, maintaining a low-density high-T halo, preventing a cooling flow ...
Die Sonne im Röntgenlicht
... • Diffuse X-ray-emitting gas is strongly concentrated toward galactic disks and bulges (< 20 kpc). • Heating is mostly due to SNe. But the bulk of their energy is not detected in X-ray near galactic bulges/disks and is probably propagated into the halos. • Feedback from a galactic bulge likely plays ...
... • Diffuse X-ray-emitting gas is strongly concentrated toward galactic disks and bulges (< 20 kpc). • Heating is mostly due to SNe. But the bulk of their energy is not detected in X-ray near galactic bulges/disks and is probably propagated into the halos. • Feedback from a galactic bulge likely plays ...
Module 5: To the Galaxies and Beyond!
... Elliptical galaxies have shapes that resemble basketballs or footballs. Unlike spiral galaxies that we learned about during our Milky Way lesson, ellipticals do not have spiral arms. They are basically made up of one gigantic bulge. They are represented by the letter E and a number representing how ...
... Elliptical galaxies have shapes that resemble basketballs or footballs. Unlike spiral galaxies that we learned about during our Milky Way lesson, ellipticals do not have spiral arms. They are basically made up of one gigantic bulge. They are represented by the letter E and a number representing how ...
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.