STEM for TY Teachers
... they're largely devoid of star-forming gas and dust, with no visible bright stars or spiral patterns. Elliptical galaxies probably comprise about 60 percent of the galaxies in the Universe. They show a wide variation in size - most are small (about 1 percent the diameter of the Milky Way), but some ...
... they're largely devoid of star-forming gas and dust, with no visible bright stars or spiral patterns. Elliptical galaxies probably comprise about 60 percent of the galaxies in the Universe. They show a wide variation in size - most are small (about 1 percent the diameter of the Milky Way), but some ...
Binary Star - Armagh Observatory
... Nebulae often form star-forming regions, such as in the Eagle Nebula. This nebula is depicted in one of NASA's most famous images, the "Pillars of Creation". In these regions the formations of gas, dust, and other materials "clump" together to form larger masses, which attract further matter, and ...
... Nebulae often form star-forming regions, such as in the Eagle Nebula. This nebula is depicted in one of NASA's most famous images, the "Pillars of Creation". In these regions the formations of gas, dust, and other materials "clump" together to form larger masses, which attract further matter, and ...
PH607lec11
... BULGE: At the centre is a relatively small central bulge. The bulge is about 2,000 parsecs in diameter. Some stars in the bulge are young ``Population I’’ stars. Other stars are ``Population II'' stars, meaning that they are relatively old, and are poor in heavy elements, having been created before ...
... BULGE: At the centre is a relatively small central bulge. The bulge is about 2,000 parsecs in diameter. Some stars in the bulge are young ``Population I’’ stars. Other stars are ``Population II'' stars, meaning that they are relatively old, and are poor in heavy elements, having been created before ...
Gamma-Ray Bursts
... wide range of the electro-magnetic spectrum, from X-rays, over ultraviolet, optical, and infrared light, to radio wavelengths. This component has been extremely valuable for understanding the origin of GRBs and the galaxies in which they are located. We now know that GRBs originated from outside our ...
... wide range of the electro-magnetic spectrum, from X-rays, over ultraviolet, optical, and infrared light, to radio wavelengths. This component has been extremely valuable for understanding the origin of GRBs and the galaxies in which they are located. We now know that GRBs originated from outside our ...
The Family of Stars
... star that never ignites Helium fusion. The collapsed Carbon/Oxygen core of a sunlike star. The collapsed iron core of a high-mass star. The collapsed iron core of a sun-like star. ...
... star that never ignites Helium fusion. The collapsed Carbon/Oxygen core of a sunlike star. The collapsed iron core of a high-mass star. The collapsed iron core of a sun-like star. ...
Study Guide for 1ST Astronomy Exam
... Draw and interpret Figure 8.1 illustrating the lunar phases and the Moon’s relationship to the Sun at each principle phase. Name the phase of the Moon from a photograph of the Moon. Estimate the number of days between lunar phases. Rank images of the Moon in different phases in order of occu ...
... Draw and interpret Figure 8.1 illustrating the lunar phases and the Moon’s relationship to the Sun at each principle phase. Name the phase of the Moon from a photograph of the Moon. Estimate the number of days between lunar phases. Rank images of the Moon in different phases in order of occu ...
review
... Measuring distances in the galaxy uses variable stars – RR lyra and Cepheid variables, whose atmospheres are unstable and oscillate up and down, producing temperature, hence luminosity, variations. The period of oscillation in luminosity is related observationally to the absolute peak luminosity, so ...
... Measuring distances in the galaxy uses variable stars – RR lyra and Cepheid variables, whose atmospheres are unstable and oscillate up and down, producing temperature, hence luminosity, variations. The period of oscillation in luminosity is related observationally to the absolute peak luminosity, so ...
Way Milky the MAPPING
... spiral galaxy is home to a dense concentration of stars that date to within a few billion years of the birth of the universe. Those ancient stars reside in an astrophysical neighborhood known as a “bar” because of its rectangular shape that measures roughly 10,000 light-years in length. And within t ...
... spiral galaxy is home to a dense concentration of stars that date to within a few billion years of the birth of the universe. Those ancient stars reside in an astrophysical neighborhood known as a “bar” because of its rectangular shape that measures roughly 10,000 light-years in length. And within t ...
TF_final3 - Arecibo Observatory
... velocity width (W) of the lines is proportional to its luminosity (L) following an equation, L ∝ In a sample of 33 LIRGs the neutral hydrogen emission line width was measured. The luminosities of these galaxies from literature were found and a study was made of whether the Tully-Fisher law is mainta ...
... velocity width (W) of the lines is proportional to its luminosity (L) following an equation, L ∝ In a sample of 33 LIRGs the neutral hydrogen emission line width was measured. The luminosities of these galaxies from literature were found and a study was made of whether the Tully-Fisher law is mainta ...
Astronomical co-ordinates
... The zero-point for Dec is on the celestial horizon which is a projection of the Earth’s equator on the sky. The zero point for RA is defined as the position of the Sun in the sky at the Vernal Equinox (~21 March), the point at which the Sun crosses the equator from South to North. It is also known a ...
... The zero-point for Dec is on the celestial horizon which is a projection of the Earth’s equator on the sky. The zero point for RA is defined as the position of the Sun in the sky at the Vernal Equinox (~21 March), the point at which the Sun crosses the equator from South to North. It is also known a ...
Teaching Text Structure with Understanding the Scale of the Universe
... collected and the techniques she developed became standard tools for astronomers to measure large distances in space. Henrietta Swan Leavitt ...
... collected and the techniques she developed became standard tools for astronomers to measure large distances in space. Henrietta Swan Leavitt ...
A new isolated dSph galaxy near the Local Group
... We determine the quantitative star formation and metal enrichment history of KKs 3 from the CMD using our STARPROBE program. The program develops an approximation to the observed distribution of stars in the CMD using a positive linear combination of synthetic diagrams formed by simple stellar popul ...
... We determine the quantitative star formation and metal enrichment history of KKs 3 from the CMD using our STARPROBE program. The program develops an approximation to the observed distribution of stars in the CMD using a positive linear combination of synthetic diagrams formed by simple stellar popul ...
lecture24
... (today’s best measurement of Hubble constant: book has H0 = 65 (km/s)/Mpc) Does this mean that our Milky Way has ‘bad breath’ and all galaxies are rushing away from us? No, we now understand that the universe as a whole is expanding so that every galaxy is receding from every other galaxy! For the m ...
... (today’s best measurement of Hubble constant: book has H0 = 65 (km/s)/Mpc) Does this mean that our Milky Way has ‘bad breath’ and all galaxies are rushing away from us? No, we now understand that the universe as a whole is expanding so that every galaxy is receding from every other galaxy! For the m ...
Power-point slides for Lecture 1
... • Clearly come from massive stars. Found in star forming regions of spiral and irregular galaxies. Not found in ellipticals. Two presupernova stars identified: SN 1987A = B3 supergiant; SN 1993J = G8 supergiant (Aldering et al 1994) ...
... • Clearly come from massive stars. Found in star forming regions of spiral and irregular galaxies. Not found in ellipticals. Two presupernova stars identified: SN 1987A = B3 supergiant; SN 1993J = G8 supergiant (Aldering et al 1994) ...
3. Galactic Dynamics handout 3 Aim: understand equilibrium of
... ax at . We can write the new scaling relation as am = ax a2v Hence ANY galaxy can be scaled up like this ! Notice that it is trivial to derive this from the virial theorem - the expression for the mass has exactly the same form. As a consequence, if we have a model for a galaxy with a certain mass a ...
... ax at . We can write the new scaling relation as am = ax a2v Hence ANY galaxy can be scaled up like this ! Notice that it is trivial to derive this from the virial theorem - the expression for the mass has exactly the same form. As a consequence, if we have a model for a galaxy with a certain mass a ...
Supermassive black holes
... Edwin Hubble used observations of _______ to determine the distance to the ...
... Edwin Hubble used observations of _______ to determine the distance to the ...
Active Galaxies and Quasars: the most luminous objects in the
... Wide field optical image of the Galactic Centre ...
... Wide field optical image of the Galactic Centre ...
PH607lec08
... The formula z = v / c implies that you can't have redshifts greater than one because that would give you a velocity greater than the speed of light, something not permitted by the laws of physics. ...
... The formula z = v / c implies that you can't have redshifts greater than one because that would give you a velocity greater than the speed of light, something not permitted by the laws of physics. ...
Star Clusters and Stellar Dynamics
... energy by an amount equal to the mean energy; or the time to change its velocity vector by ~ 90 deg. • There will be a few strong encounters, and lots of weak ones. Their effects can be estimated through Coulomlike scattering ...
... energy by an amount equal to the mean energy; or the time to change its velocity vector by ~ 90 deg. • There will be a few strong encounters, and lots of weak ones. Their effects can be estimated through Coulomlike scattering ...
ASTR2100 - Saint Mary's University | Astronomy & Physics
... In 1837 Argelander, of the Bonn Observatory and orginator of the BD catalogue, was able to derive an apex for the solar motion from studying stellar proper motions. His result is very similar to that recognized today. Also in 1837, Frederick Struve found evidence for interstellar extinction in star ...
... In 1837 Argelander, of the Bonn Observatory and orginator of the BD catalogue, was able to derive an apex for the solar motion from studying stellar proper motions. His result is very similar to that recognized today. Also in 1837, Frederick Struve found evidence for interstellar extinction in star ...
Ch. 15 Notes
... dense that the speed needed to escape it is faster than the speed of light. This means that any object that gets too close would not be able to escape. • The existence of black holes was first proposed by Albert Einstein as a result of his Theory of General Relativity. He called them “dark stars”, b ...
... dense that the speed needed to escape it is faster than the speed of light. This means that any object that gets too close would not be able to escape. • The existence of black holes was first proposed by Albert Einstein as a result of his Theory of General Relativity. He called them “dark stars”, b ...
chap8 (WP)
... can be determined from parallax and other techniques. The velocity of the star with respect to the Earth can be found from the red-shift of its light. It is observed that the further a star or galaxy is from the Earth, the faster it is moving away from us: V = HR [Hubble's law]. Thus, the universe a ...
... can be determined from parallax and other techniques. The velocity of the star with respect to the Earth can be found from the red-shift of its light. It is observed that the further a star or galaxy is from the Earth, the faster it is moving away from us: V = HR [Hubble's law]. Thus, the universe a ...
Andromeda Nebula Lies Outside Milky Way Galaxy
... stars were in the Small Magellanic Cloud, they were at roughly the same distance from the Earth. Each Cepheid's true brightness was directly related to its period. Soon after Miss Leavitt's discovery, Dr. Shapley began searching for Cepheids in globular clusters in our own Milky Way galaxy. Globular ...
... stars were in the Small Magellanic Cloud, they were at roughly the same distance from the Earth. Each Cepheid's true brightness was directly related to its period. Soon after Miss Leavitt's discovery, Dr. Shapley began searching for Cepheids in globular clusters in our own Milky Way galaxy. Globular ...
PH607 – Galaxies
... MACHO: astronomical object that might explain the apparent presence of dark matter in galaxy halos. A MACHO is a small chunk of normal baryonic matter, which emits little or no radiation and drifts through interstellar space. Since MACHOs would not emit any light of their own, they would be very har ...
... MACHO: astronomical object that might explain the apparent presence of dark matter in galaxy halos. A MACHO is a small chunk of normal baryonic matter, which emits little or no radiation and drifts through interstellar space. Since MACHOs would not emit any light of their own, they would be very har ...
Variable Stars
... Quasars are believed to produce their energy from massive black holes in the center of the galaxies in which the quasars are located. Because quasars are so bright, they drown out the light from all the other stars in the same galaxy. ...
... Quasars are believed to produce their energy from massive black holes in the center of the galaxies in which the quasars are located. Because quasars are so bright, they drown out the light from all the other stars in the same galaxy. ...
Cosmic distance ladder
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are ""close enough"" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances and methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity.The ladder analogy arises because no one technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung.