Cosmic Dawn A Hunting for the First Stars in the Universe
... the lab with the astronomical spectrum, to see that their wavelengths are all boosted by the same factor of (1+z). Because we live in an expanding universe, each object’s recession velocity (and hence its redshift) is proportional to its distance from the Earth (see sidebar). Objects with large reds ...
... the lab with the astronomical spectrum, to see that their wavelengths are all boosted by the same factor of (1+z). Because we live in an expanding universe, each object’s recession velocity (and hence its redshift) is proportional to its distance from the Earth (see sidebar). Objects with large reds ...
Gas Mixing, Gas Cycles and the Chemical Evolution of Dwarf
... illustration Fig.3 shows that the SF-rate density increases immediately with the infall. Since the clouds have Jeans masses their mean density is larger for smaller masses, i.e. the 106 M cloud has a 100 times larger radius than 104 M and thus needs at constant infall velocity 100 times longer. Fo ...
... illustration Fig.3 shows that the SF-rate density increases immediately with the infall. Since the clouds have Jeans masses their mean density is larger for smaller masses, i.e. the 106 M cloud has a 100 times larger radius than 104 M and thus needs at constant infall velocity 100 times longer. Fo ...
The Role of the Galaxy in the Dynamical Evolution of
... Model: Planetesimal clearing without gas and using existing planetary ...
... Model: Planetesimal clearing without gas and using existing planetary ...
slides
... What is the reason we see Milky way as a luminous cloud? What is most distant object in the universe can be seen with the unaided eye? What are the dark areas in the Milky way, devoid of any stars? What are the Magellanic clouds? Are they visible from the US? Why? What is the size of the Andromeda g ...
... What is the reason we see Milky way as a luminous cloud? What is most distant object in the universe can be seen with the unaided eye? What are the dark areas in the Milky way, devoid of any stars? What are the Magellanic clouds? Are they visible from the US? Why? What is the size of the Andromeda g ...
Deep Space (PDF: 224k)
... the Milky Way, pulled in by the relentless force of our galaxy’s gravitational field. Data suggest that this is not an isolated incident. We believe that another satellite called the Sagittarius Dwarf Galaxy is crashing into us right now on the far side of the galaxy. And data suggest that many othe ...
... the Milky Way, pulled in by the relentless force of our galaxy’s gravitational field. Data suggest that this is not an isolated incident. We believe that another satellite called the Sagittarius Dwarf Galaxy is crashing into us right now on the far side of the galaxy. And data suggest that many othe ...
Winners of the OBAFGKM Mnemonic Quasars & Active Galactic Nuclei—4 April
... the Schwarzschild radius of a black hole. RS=3km M/M¤. RS=3km if M=M¤. RS=3×106km (3 times moon’s orbit) if M=106M¤. RS=3×109km (Saturn’s) if M=109M¤. ...
... the Schwarzschild radius of a black hole. RS=3km M/M¤. RS=3km if M=M¤. RS=3×106km (3 times moon’s orbit) if M=106M¤. RS=3×109km (Saturn’s) if M=109M¤. ...
Astronomical distance
... other galaxies are so vast that even light takes a long time to travel to us from these distant objects. As you know distances in astronomy can be measure in light seconds, light hours or light years. Using that idea the Sun is 8½ light minutes away – that means it takes light 8½ minutes to reach us ...
... other galaxies are so vast that even light takes a long time to travel to us from these distant objects. As you know distances in astronomy can be measure in light seconds, light hours or light years. Using that idea the Sun is 8½ light minutes away – that means it takes light 8½ minutes to reach us ...
Astronomy Facts
... The sun is 1.4 million km across (110 times the earth), and over 150 million km away (500 light seconds) The largest stars (eg: Betelgeuse, Antares) are over 400 million km across (more than 300 times the diameter of the Sun) The brightest stars are over 10,000 times brighter than the sun. The dista ...
... The sun is 1.4 million km across (110 times the earth), and over 150 million km away (500 light seconds) The largest stars (eg: Betelgeuse, Antares) are over 400 million km across (more than 300 times the diameter of the Sun) The brightest stars are over 10,000 times brighter than the sun. The dista ...
The human race has made great strides in the last few centuries
... relieving the pressure in the core. This electron degenerate core of carbon then cools into a White Dwarf star. A White Dwarf is about the size of the Earth but has a mass that is usually about 70% the mass of the Sun with a surface temperature comparable to or higher than the Sun. Electron degenera ...
... relieving the pressure in the core. This electron degenerate core of carbon then cools into a White Dwarf star. A White Dwarf is about the size of the Earth but has a mass that is usually about 70% the mass of the Sun with a surface temperature comparable to or higher than the Sun. Electron degenera ...
Candidate`s registration number: Desk number: ………………….. Date
... Answer ALL questions in Section A, and THREE questions in Section B. You should spend roughly an hour on each section. Answer Section A in the spaces provided on this paper, answer Section B in an answer book. At the end of the examination, tie this paper to your answer book for Section B and hand t ...
... Answer ALL questions in Section A, and THREE questions in Section B. You should spend roughly an hour on each section. Answer Section A in the spaces provided on this paper, answer Section B in an answer book. At the end of the examination, tie this paper to your answer book for Section B and hand t ...
Section 19.3
... The Big Bang theory says the universe began as a huge explosion between 10 billion and 20 billion years ago. According to this theory, all matter and energy started in a space smaller than the nucleus of an atom. ...
... The Big Bang theory says the universe began as a huge explosion between 10 billion and 20 billion years ago. According to this theory, all matter and energy started in a space smaller than the nucleus of an atom. ...
Figures I through VII in Section 1 on the following sheet
... What is the period of the star that produced figure VIII (_23_)? Another star of the same type with twice the period appears equally bright in the night sky. Is that star farther away from or closer to the observer than the star that produced figure VIII (_24_)? Galaxies X and Y appear equally brigh ...
... What is the period of the star that produced figure VIII (_23_)? Another star of the same type with twice the period appears equally bright in the night sky. Is that star farther away from or closer to the observer than the star that produced figure VIII (_24_)? Galaxies X and Y appear equally brigh ...
Galaxy - Bama.ua.edu
... no acceleration) Distance in 10 light years • Horizontal axis also past time. • Accelerating universe points would be below curve • Gravitationally decelerating points would be above the curve. • Observed SN are below the line=> Acceleration due to new component “dark energy.” which began to dominat ...
... no acceleration) Distance in 10 light years • Horizontal axis also past time. • Accelerating universe points would be below curve • Gravitationally decelerating points would be above the curve. • Observed SN are below the line=> Acceleration due to new component “dark energy.” which began to dominat ...
History of Star Formation in Local Galaxies
... and outflow is needed, i.e, Leo I dSph, LMC, SMC. BUT … in order to solve the “Missing Satellite Problem” cosmologists assume most of the reservoir of gas that could accrete onto dwarfs over time is “boiled off” during reionization. If so, then where do dSphs accrete pristine gas to sustain their ...
... and outflow is needed, i.e, Leo I dSph, LMC, SMC. BUT … in order to solve the “Missing Satellite Problem” cosmologists assume most of the reservoir of gas that could accrete onto dwarfs over time is “boiled off” during reionization. If so, then where do dSphs accrete pristine gas to sustain their ...
The Milky Way Laboratory
... Basic Science Questions: 1) What is the cause of the extremely low star formation efficiency (given the reservoir of dense gas) in the CMZ? 2) Is there an energy and SF cycle in the CMZ? Where does gas enter the CMZ? 3) Is SF induced by tidal compression by SgrA*? 4) Can we find precursors to the mo ...
... Basic Science Questions: 1) What is the cause of the extremely low star formation efficiency (given the reservoir of dense gas) in the CMZ? 2) Is there an energy and SF cycle in the CMZ? Where does gas enter the CMZ? 3) Is SF induced by tidal compression by SgrA*? 4) Can we find precursors to the mo ...
From Dust to Planetesimals
... 1) The current mass period distribution of extra solar planets can be used to infer the formation conditions 2) Abundant rocky planets can exist without the presence of gas giants 3) Protostellar disks may have been repeated cleared through the formation, migration, and stellar consumption of planet ...
... 1) The current mass period distribution of extra solar planets can be used to infer the formation conditions 2) Abundant rocky planets can exist without the presence of gas giants 3) Protostellar disks may have been repeated cleared through the formation, migration, and stellar consumption of planet ...
The driving mechanism of starbursts in galaxy mergers
... ISM. An m = 2 mode excited by tidal torquing is still visible, but the clumpy gas builds a much more modest central density peak than the low-resolution model: star formation is now spread over 2 kpc (Fig. 3). The gas response to the interaction is actually dominated by fragmentation in many dense c ...
... ISM. An m = 2 mode excited by tidal torquing is still visible, but the clumpy gas builds a much more modest central density peak than the low-resolution model: star formation is now spread over 2 kpc (Fig. 3). The gas response to the interaction is actually dominated by fragmentation in many dense c ...
2P33.pdf
... in the light distribution is strongly correlated with t and the color of the galaxy. Asymmetry in rotation curves is also well correlated with t, MB and the color of the galaxy. Then, asymmetry in mass distribution is directly linked with asymmetry in luminous matter distribution. Asymmetry in mass ...
... in the light distribution is strongly correlated with t and the color of the galaxy. Asymmetry in rotation curves is also well correlated with t, MB and the color of the galaxy. Then, asymmetry in mass distribution is directly linked with asymmetry in luminous matter distribution. Asymmetry in mass ...
ppt
... “star” in the galaxy and assume that it is the same as the brightest star in nearby galaxies. BUT, brightest object may not be a star at all! Overall galactic apparent brightness method – for distant galaxies, simply use overall brightness of galaxy to gauge distance. Very error prone! ...
... “star” in the galaxy and assume that it is the same as the brightest star in nearby galaxies. BUT, brightest object may not be a star at all! Overall galactic apparent brightness method – for distant galaxies, simply use overall brightness of galaxy to gauge distance. Very error prone! ...
Protostars and planets
... hydrogen; its luminosity is offset instead by gravitational contraction. The entropy of a protostar is higher than the entropy of a main-sequence star of the same mass. As entropy is lost to radiation and the radius contracts, the central temperature rises until the thermonuclear reaction rate balan ...
... hydrogen; its luminosity is offset instead by gravitational contraction. The entropy of a protostar is higher than the entropy of a main-sequence star of the same mass. As entropy is lost to radiation and the radius contracts, the central temperature rises until the thermonuclear reaction rate balan ...
1 Astronomical Measurements and Quantities 2 Astronomical Objects
... method. A brief overview of different methods treated through the course to go from very nearby objects to very distant ones. [K],[BM] Galaxy Clusters: Morphological classification. Main properties. Clusters as multicomponent objects and their multivawelenght observations: optical, X-ray, gravitatio ...
... method. A brief overview of different methods treated through the course to go from very nearby objects to very distant ones. [K],[BM] Galaxy Clusters: Morphological classification. Main properties. Clusters as multicomponent objects and their multivawelenght observations: optical, X-ray, gravitatio ...
Pretest
... inner solar system, most gases escaped the gravity of planets forming in this region, causing the inner planets to be rocky. The outer solar system, being farther from the sun, was cooler. As a result, planets forming in this region were able to capture gases and so became gas giants. ...
... inner solar system, most gases escaped the gravity of planets forming in this region, causing the inner planets to be rocky. The outer solar system, being farther from the sun, was cooler. As a result, planets forming in this region were able to capture gases and so became gas giants. ...