Astronomy 401 Lecture 4 Kinematics of the Milky Way 1 The local
... A plot of rotational velocity vs radius is called a rotation curve. Measurements of velocities of objects at R > R0 (Cepheid variables for which we can measure distances; more on that later) show that the rotational speed V (R) doesn’t significantly decrease with distance beyond R0 . This was a big ...
... A plot of rotational velocity vs radius is called a rotation curve. Measurements of velocities of objects at R > R0 (Cepheid variables for which we can measure distances; more on that later) show that the rotational speed V (R) doesn’t significantly decrease with distance beyond R0 . This was a big ...
Galaxies - sciencejedi.com
... • What Zwicky discovered was that v > vesc ! The Coma Cluster should have flown apart long ago, but it was still holding together. • The only conclusion was there was some missing mass that wasn’t accounted for by the light – over 90%! By the 1970s, we had developed new kinds of astronomy using othe ...
... • What Zwicky discovered was that v > vesc ! The Coma Cluster should have flown apart long ago, but it was still holding together. • The only conclusion was there was some missing mass that wasn’t accounted for by the light – over 90%! By the 1970s, we had developed new kinds of astronomy using othe ...
PPT
... Why observe the 21 cm line in other galaxies? • Center of line • provides recessional velocity of galaxy • provides distance to galaxy (if unknown) • Width of line • provides rotational velocity of the galaxy • provides dynamical mass of the galaxy • Total flux in HI line • provides HI mass of the ...
... Why observe the 21 cm line in other galaxies? • Center of line • provides recessional velocity of galaxy • provides distance to galaxy (if unknown) • Width of line • provides rotational velocity of the galaxy • provides dynamical mass of the galaxy • Total flux in HI line • provides HI mass of the ...
Notes: Astronomy and Groups of Stars
... The core of stars is very hot. The temperatures observed are of the outer layer of the star. ...
... The core of stars is very hot. The temperatures observed are of the outer layer of the star. ...
Milky Way galaxy - Uplift North Hills Prep
... Before October 6, 1923, astronomers thought the Andromeda Nebula and similar objects were bright pockets of matter inside the Milky Way. On that day astronomer Edwin Hubble noticed, looking at the photograps, a particular type of star inside the Andromeda Nebula. Hubble realized that the star (Ceph ...
... Before October 6, 1923, astronomers thought the Andromeda Nebula and similar objects were bright pockets of matter inside the Milky Way. On that day astronomer Edwin Hubble noticed, looking at the photograps, a particular type of star inside the Andromeda Nebula. Hubble realized that the star (Ceph ...
The Sun, Stars, and Beyond
... • Irregularly shaped galaxies also exist, though fewer in number. • A galaxy’s shape is determined by its rate of spin, and if it has been subject to any collisions or mergers. • These all contain 100 billion stars or more, and there are 100 billion galaxies out there! ...
... • Irregularly shaped galaxies also exist, though fewer in number. • A galaxy’s shape is determined by its rate of spin, and if it has been subject to any collisions or mergers. • These all contain 100 billion stars or more, and there are 100 billion galaxies out there! ...
Jeopardy Questions
... Q: What is an open cluster? A: These types of star clusters are young because gravity is not strong enough to hold them together over time ...
... Q: What is an open cluster? A: These types of star clusters are young because gravity is not strong enough to hold them together over time ...
PPT
... (accretion) this is a protostar 2. Inside the core, temperature increases as gas atom collisions increase. 3. Density of the core increases as more atoms try to share the same space. 4. Gas pressure increases as atomic collisions and density (atoms/space) increase. 5. The protostar’s gas pressure RE ...
... (accretion) this is a protostar 2. Inside the core, temperature increases as gas atom collisions increase. 3. Density of the core increases as more atoms try to share the same space. 4. Gas pressure increases as atomic collisions and density (atoms/space) increase. 5. The protostar’s gas pressure RE ...
Probing DM Halo Shapes Using Satellite Galaxy Kinematics
... – Only use subhalos most likely to host satellites • Most massive at infall? • Highest collapse z? • Conditional Luminosity Function? ...
... – Only use subhalos most likely to host satellites • Most massive at infall? • Highest collapse z? • Conditional Luminosity Function? ...
Recent advances in star
... areas of astronomy today. It is a key to understanding not only the evolution of the Milky Way, but also the immense luminosities of starburst and merging galaxies and the emission from high-redshift galaxies. Inevitably, most work on star formation focuses on the Milky Way, as here we have a grands ...
... areas of astronomy today. It is a key to understanding not only the evolution of the Milky Way, but also the immense luminosities of starburst and merging galaxies and the emission from high-redshift galaxies. Inevitably, most work on star formation focuses on the Milky Way, as here we have a grands ...
PPT Slides - Center for Computational Sciences
... • Galaxy lifetimes greater than 109 yr. • Yet star formation continues today. • How are starbursts, low surface brightness galaxies different? ...
... • Galaxy lifetimes greater than 109 yr. • Yet star formation continues today. • How are starbursts, low surface brightness galaxies different? ...
Galactic Address/Stars/Constellations
... • Northern Hemisphere • Earth • Solar System • Milky Way Galaxy • Local Group • Virgo Supercluster • Universe ...
... • Northern Hemisphere • Earth • Solar System • Milky Way Galaxy • Local Group • Virgo Supercluster • Universe ...
THE ROLE OF BLACK HOLES IN GALAXY FORMATION Tiziana Di Matteo
... BH forms an accretion disk. Gas particles interact as they move around. They heat up, lose energy and ang. mom. emit radiation. ...
... BH forms an accretion disk. Gas particles interact as they move around. They heat up, lose energy and ang. mom. emit radiation. ...
WIRO: Spectral Analysis P1
... comparatively low turbulence in the air above the mountain, (3) a dark night sky, (4) close proximity to the University of Wyoming, and (5) pre-existing road, electricity and phone lines since Jelm was formerly used by the US Forest Service and BLM as a fire lookout station. ...
... comparatively low turbulence in the air above the mountain, (3) a dark night sky, (4) close proximity to the University of Wyoming, and (5) pre-existing road, electricity and phone lines since Jelm was formerly used by the US Forest Service and BLM as a fire lookout station. ...
Observational Data
... [Fe/H]<-2.8, while the simulated galaxy has a significant fraction of stars with such low metallicity (G-dwarf problem). ・ The velocity dispersion of our simulated galaxy is too small compared with the observed values. ・ The V-band magnitude of the simulated galaxy (Mv=-7.23) is also small compared ...
... [Fe/H]<-2.8, while the simulated galaxy has a significant fraction of stars with such low metallicity (G-dwarf problem). ・ The velocity dispersion of our simulated galaxy is too small compared with the observed values. ・ The V-band magnitude of the simulated galaxy (Mv=-7.23) is also small compared ...
Goal: To understand how Saturn formed and what its core is like
... • There is a lot more carbon than there is iron and silicon in the cloud forming the sun. • So, even though there is less material overall to form a planet at this distance a much larger percentage of it becomes solid. • This allows you to build much larger planets! ...
... • There is a lot more carbon than there is iron and silicon in the cloud forming the sun. • So, even though there is less material overall to form a planet at this distance a much larger percentage of it becomes solid. • This allows you to build much larger planets! ...
Orbits and Dark Matter, the Center of the Milky Way
... Might be normal matter in a form that doesn’t emit much light – very small and dim star, little black holes • More likely it is elementary particles other than normal matter ...
... Might be normal matter in a form that doesn’t emit much light – very small and dim star, little black holes • More likely it is elementary particles other than normal matter ...
November 2008 - Otterbein University
... • there are ~ 100 billion galaxies in the observable Universe • measure distances to other galaxies using the periodluminosity relationship for Cepheid variables • Type I supernovae also used to measure distances – Predictable luminosity – a standard candle ...
... • there are ~ 100 billion galaxies in the observable Universe • measure distances to other galaxies using the periodluminosity relationship for Cepheid variables • Type I supernovae also used to measure distances – Predictable luminosity – a standard candle ...
Great Astronomers of the 20th Century
... runs out of steam – Luminosity of galaxy is correlated to the width of its spectral absorption lines – Velocity dispersion of the inner few kiloparsecs of a galaxy ...
... runs out of steam – Luminosity of galaxy is correlated to the width of its spectral absorption lines – Velocity dispersion of the inner few kiloparsecs of a galaxy ...
form b - University of Iowa Astrophysics
... (b) Cepheid variables change their brightness too quickly to detect at great distances. (c) Most galaxies in the universe are elliptical and don’t have Cepheid variables. (d) The luminosity of SN Type Ia explosions is much greater than Cepheid variables. (e) Cepheid variables are not found in the mo ...
... (b) Cepheid variables change their brightness too quickly to detect at great distances. (c) Most galaxies in the universe are elliptical and don’t have Cepheid variables. (d) The luminosity of SN Type Ia explosions is much greater than Cepheid variables. (e) Cepheid variables are not found in the mo ...
Measuring the Distances to the Stars: Parallax What sets the parallax limit? 1
... • , , Z velocities but relative to Local Standard of Rest • LSR is point instantaneously centered on Sun, but moving in a ...
... • , , Z velocities but relative to Local Standard of Rest • LSR is point instantaneously centered on Sun, but moving in a ...
NAME
... ____ 23. What observed property of the Milky Way suggests that it contains a large amount of matter not in the form of stars? a. the rotation curve b. the velocities of the open star clusters c. the number and shape of the spiral arms d. the thickness of the disk e. the presence of a black hole at t ...
... ____ 23. What observed property of the Milky Way suggests that it contains a large amount of matter not in the form of stars? a. the rotation curve b. the velocities of the open star clusters c. the number and shape of the spiral arms d. the thickness of the disk e. the presence of a black hole at t ...
Observational Astronomy - Lecture 10 Galaxies
... mass of galaxies is in the form of “Dark Matter”. This matter is not made up of ordinary matter (i.e. it is not made up of atoms). The ordinary matter (which astronomers typically call “baryonic” matter), has the following components: Stars and planets - these account for perhaps 10-50% of the ordin ...
... mass of galaxies is in the form of “Dark Matter”. This matter is not made up of ordinary matter (i.e. it is not made up of atoms). The ordinary matter (which astronomers typically call “baryonic” matter), has the following components: Stars and planets - these account for perhaps 10-50% of the ordin ...