Lecture 17: Black Holes
... halo dark matter may be in the form of compact objects. They have typical stellar masses, but they must be dark… • White dwarfs? No (constraints from metal production, cosmic background radiation…) • So, perhaps this is just an error that will go away… ...
... halo dark matter may be in the form of compact objects. They have typical stellar masses, but they must be dark… • White dwarfs? No (constraints from metal production, cosmic background radiation…) • So, perhaps this is just an error that will go away… ...
Age, EvoluFon, and Size of the Cosmos
... • Protons and neutrons are able to bind together to form nuclei since their binding energy is now greater than the cosmic background radia+on energy, so the background of light (photons) can’t break th ...
... • Protons and neutrons are able to bind together to form nuclei since their binding energy is now greater than the cosmic background radia+on energy, so the background of light (photons) can’t break th ...
Astronomy
... D) White dwarf (only) E) Main sequence and double shell burning 21. What event is responsible for the ultimate death of the Sun? A) All the hydrogen runs out B) All the helium runs out C) The outer layers of the Sun are blown away by strong winds D) The Sun burns all the way to iron, which cannot bu ...
... D) White dwarf (only) E) Main sequence and double shell burning 21. What event is responsible for the ultimate death of the Sun? A) All the hydrogen runs out B) All the helium runs out C) The outer layers of the Sun are blown away by strong winds D) The Sun burns all the way to iron, which cannot bu ...
Document
... A) A low mass star B) A high mass star C) A non-luminous star D) An old star E) A star in a binary system 7. A massive star supernova is most likely to occur in a region where A) All the stars are very luminous B) All the stars are very dim C) There are a lot of new stars being born D) All the stars ...
... A) A low mass star B) A high mass star C) A non-luminous star D) An old star E) A star in a binary system 7. A massive star supernova is most likely to occur in a region where A) All the stars are very luminous B) All the stars are very dim C) There are a lot of new stars being born D) All the stars ...
Dark Matter -24-------------------------------~-----------R-E-S-O-N-A-N-C
... (i) It doesn't exist; the law of gravitation must be modified so that the stars are all there is to a galaxy. (ii) Dark matter exists, but consists entirely of ord~nary matter - Jupiter-like objects called broum dwarfs that are not massive enough to start the stellar energy-generating process of nuc ...
... (i) It doesn't exist; the law of gravitation must be modified so that the stars are all there is to a galaxy. (ii) Dark matter exists, but consists entirely of ord~nary matter - Jupiter-like objects called broum dwarfs that are not massive enough to start the stellar energy-generating process of nuc ...
ATA2010
... protogalactic dark matter mini-halos. Surviving stars will become part of the stellar halo - the oldest stars in the Galaxy ...
... protogalactic dark matter mini-halos. Surviving stars will become part of the stellar halo - the oldest stars in the Galaxy ...
The Life And Times Of A Star
... The hydrogen fusion is happening very, very fast now, so a LOT of waste helium is getting produced and dumped onto the dead helium core. The dead helium core is now very big and massive, but still isn’t producing energy using nuclear fusion, so it continues to collapse under its own weight. ...
... The hydrogen fusion is happening very, very fast now, so a LOT of waste helium is getting produced and dumped onto the dead helium core. The dead helium core is now very big and massive, but still isn’t producing energy using nuclear fusion, so it continues to collapse under its own weight. ...
Hertzsprung-Russell Diagrams
... Hertzsprung - Russell Diagram The Hertzsprung -Russell (H-R) Diagram is a graph that plots stars color (spectral type or surface temperature) vs. its luminosity (intrinsic brightness or absolute magnitude). On it, astronomers plot stars' color, temperature, luminosity, spectral type, and evolutiona ...
... Hertzsprung - Russell Diagram The Hertzsprung -Russell (H-R) Diagram is a graph that plots stars color (spectral type or surface temperature) vs. its luminosity (intrinsic brightness or absolute magnitude). On it, astronomers plot stars' color, temperature, luminosity, spectral type, and evolutiona ...
How do stars produce energy?
... – Not enough enough for helium nuclear reactions: these have stronger electromagnetic repulsion since they have two protons ...
... – Not enough enough for helium nuclear reactions: these have stronger electromagnetic repulsion since they have two protons ...
Evolution of Warm Debris Around Sun-like Stars: Clues to Terrestrial
... exhibit 24 micron excess indicative of a collisional planetesimal swarm evolution from inside out, but at different times? If so, then one might consider SUMMING the fractions of stars exhibiting 24 micron excess between 10-300 Myr, resulting in an overall fraction of stars with evidence for terrest ...
... exhibit 24 micron excess indicative of a collisional planetesimal swarm evolution from inside out, but at different times? If so, then one might consider SUMMING the fractions of stars exhibiting 24 micron excess between 10-300 Myr, resulting in an overall fraction of stars with evidence for terrest ...
Monday, April 17, 2017 Exam 4, Skywatch 4, Friday, April 21
... Maybe only one, and we found it! Surprisingly, most binary black hole candidates have small mass main sequence companions, typically ~ 1/2 solar mass. Observe ~45 such systems and guess there may be ~1000 in the Galaxy ...
... Maybe only one, and we found it! Surprisingly, most binary black hole candidates have small mass main sequence companions, typically ~ 1/2 solar mass. Observe ~45 such systems and guess there may be ~1000 in the Galaxy ...
ppt - University of Arizona
... • Year 5 WMAP release has reduced the uncertainties in the electron optical depth so the epoch of reionization is constrained to z~11.0 ± 1.4, equivalent to ~350Myr after Big Bang. • Spectra of SDSS z~6 QSOs show hints that Universe was reionized at only somewhat higher z than 6.5. • Need to search ...
... • Year 5 WMAP release has reduced the uncertainties in the electron optical depth so the epoch of reionization is constrained to z~11.0 ± 1.4, equivalent to ~350Myr after Big Bang. • Spectra of SDSS z~6 QSOs show hints that Universe was reionized at only somewhat higher z than 6.5. • Need to search ...
D109-08x
... galaxies. The images, taken over several wavelengths, provide evidence of the "galactic assault and battery," namely, gas being stripped from the doomed galaxy, called C153. The composite photograph at left was made by combining the four images at right, taken in X-ray, radio, and visible wavelength ...
... galaxies. The images, taken over several wavelengths, provide evidence of the "galactic assault and battery," namely, gas being stripped from the doomed galaxy, called C153. The composite photograph at left was made by combining the four images at right, taken in X-ray, radio, and visible wavelength ...
Star names and magnitudes
... Many “naked-eye” objects are identified by their constellation name abbreviated to an IAU 3-letter standard, followed by a letter from the Greek alphabet in order of decreasing brightness (eg, Sirius,the brightest star in Canis Majoris, is also known as aCMa). This was devised by Bayer in 1603. If t ...
... Many “naked-eye” objects are identified by their constellation name abbreviated to an IAU 3-letter standard, followed by a letter from the Greek alphabet in order of decreasing brightness (eg, Sirius,the brightest star in Canis Majoris, is also known as aCMa). This was devised by Bayer in 1603. If t ...
Chapter 12: Measuring the Properties of Stars
... 9. Another group of variables, the RR Lyrae stars, are also used as distance candles. Their periods range from a few hours to one day and their luminosity is approximately constant. They are less luminous than the Cepheids and thus can only be seen to smaller distances. 10. Though only a few thousan ...
... 9. Another group of variables, the RR Lyrae stars, are also used as distance candles. Their periods range from a few hours to one day and their luminosity is approximately constant. They are less luminous than the Cepheids and thus can only be seen to smaller distances. 10. Though only a few thousan ...
Searching For Planets Beyond Our Solar System - Cosmos
... Earth, this is done by plate tectonics, whereas much smaller planets would lack the internal heat necessary to sustain these motions. ...
... Earth, this is done by plate tectonics, whereas much smaller planets would lack the internal heat necessary to sustain these motions. ...
z - STScI
... over HST comparable to the advance of HST • NGST can observe – Acceleration/deceleration of expanding universe – Cosmic dark matter – First luminous objects after Big Bang, even if much ...
... over HST comparable to the advance of HST • NGST can observe – Acceleration/deceleration of expanding universe – Cosmic dark matter – First luminous objects after Big Bang, even if much ...
Chapter 15
... A Black Hole at the Center of Our Galaxy By following the orbits of individual stars near the center of the Milky Way, the mass of the central black hole could be determined to ~ 2.6 million solar masses ...
... A Black Hole at the Center of Our Galaxy By following the orbits of individual stars near the center of the Milky Way, the mass of the central black hole could be determined to ~ 2.6 million solar masses ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.