Chapter 10 The Bizarre Stellar Graveyard
... • What is a black hole? – A black hole is a massive object whose radius is so small that the escape velocity exceeds the speed of light. ...
... • What is a black hole? – A black hole is a massive object whose radius is so small that the escape velocity exceeds the speed of light. ...
A Legacy Study of Stellar Life Cycles in the Galactic Center
... • Unusual for an XRB to be in outburst for so long (Chen et al. 1997). • Microquasars and some pulsars might have required luminosity and hard spectrum in high state • Fluorescent line seen in Sgr B2, Sgr C, and central parsecs of Galaxy, so would need multiple microquasars, such as GRS 1915+10, but ...
... • Unusual for an XRB to be in outburst for so long (Chen et al. 1997). • Microquasars and some pulsars might have required luminosity and hard spectrum in high state • Fluorescent line seen in Sgr B2, Sgr C, and central parsecs of Galaxy, so would need multiple microquasars, such as GRS 1915+10, but ...
stars
... Observations confirm that Be star lineprofile variability is due to the non-radial pulsations (NRP). Some mixed modes of NRP (retrograde) are associated with the transport of angular momentum up to the surface and beyond, saying, pulsational energy may leak out of a hot star into ...
... Observations confirm that Be star lineprofile variability is due to the non-radial pulsations (NRP). Some mixed modes of NRP (retrograde) are associated with the transport of angular momentum up to the surface and beyond, saying, pulsational energy may leak out of a hot star into ...
PowerPoint Presentation - Neutron stars, pulsars and black
... than 100 times per second (the first was spinning 640 times per second) threw the field for a loop. When some millisecond pulsars were discovered in old star clusters it was even more confusing. • Eventually it was determined that all millisecond pulsars were in close binary systems and were `spun u ...
... than 100 times per second (the first was spinning 640 times per second) threw the field for a loop. When some millisecond pulsars were discovered in old star clusters it was even more confusing. • Eventually it was determined that all millisecond pulsars were in close binary systems and were `spun u ...
Stellar Remnants - Sierra College Astronomy Home Page
... White Dwarfs in Binary Systems An Alternate End-Game for White Dwarfs A close binary system of a white dwarf and a newly formed red giant will result in the formation of an accretion disk around the white dwarf. Hydrogen build-up on the white dwarf can ignite an explosive fusion reaction blowing ...
... White Dwarfs in Binary Systems An Alternate End-Game for White Dwarfs A close binary system of a white dwarf and a newly formed red giant will result in the formation of an accretion disk around the white dwarf. Hydrogen build-up on the white dwarf can ignite an explosive fusion reaction blowing ...
Lecture21
... • Nuclei with too many neutrons are unstable; beyond the 'neutron drip-line', nuclei become unbound. These neutrons form a nuclear halo: the neutron density extends to greater distances than is the case in a well-bound, ...
... • Nuclei with too many neutrons are unstable; beyond the 'neutron drip-line', nuclei become unbound. These neutrons form a nuclear halo: the neutron density extends to greater distances than is the case in a well-bound, ...
The Extreme Universe of Gamma-ray Astronomy
... So, how do black holes emit jets of particles and light? And, how do the particles in the jets accelerate to near light speed? ...
... So, how do black holes emit jets of particles and light? And, how do the particles in the jets accelerate to near light speed? ...
ppt - Slides by Prof Christian
... pressure can no longer hold up against gravity. WDs with more than ~ 1.4 solar masses can not exist! Chandrasekhar Limit = 1.4 Msun ...
... pressure can no longer hold up against gravity. WDs with more than ~ 1.4 solar masses can not exist! Chandrasekhar Limit = 1.4 Msun ...
Life Cycles of Stars
... because they are the densest objects known except for black holes. A teaspoon of neutron star material weighs 100 million tons. ...
... because they are the densest objects known except for black holes. A teaspoon of neutron star material weighs 100 million tons. ...
Scattering (and the blue sky)
... Visible and Infrared Extinction The dark dust clouds are very opaque in the visible, but we can see through them better and better, the longer the wavelength of light that is used. Looking through the galactic plane has the same effect; to see to the heart of the Galaxy you must use infrared or rad ...
... Visible and Infrared Extinction The dark dust clouds are very opaque in the visible, but we can see through them better and better, the longer the wavelength of light that is used. Looking through the galactic plane has the same effect; to see to the heart of the Galaxy you must use infrared or rad ...
ASTR 1020 FINAL EXAM STUDY GUIDE
... 3) How do we know the gamma-ray bursts do not come from neutron stars with accretion disks? 4) What do we mean by the singularity of a black hole? 5) When we see X-rays from an accretion disk in a binary system, we can’t immediately tell whether the accretion disk surrounds a neutron star or a black ...
... 3) How do we know the gamma-ray bursts do not come from neutron stars with accretion disks? 4) What do we mean by the singularity of a black hole? 5) When we see X-rays from an accretion disk in a binary system, we can’t immediately tell whether the accretion disk surrounds a neutron star or a black ...
AAS_WFXT_Solar_System_11Jan2010
... study. Most objects have been detected with only a few photons. • There is an important list of solar system objects that have yet to be detected in the x-ray : Mercury, the ice giants Uranus/Neptune, the Main Belt comets,KBOs, and the heliopause. • Large Scale WFXT Imaging will allow for direct, co ...
... study. Most objects have been detected with only a few photons. • There is an important list of solar system objects that have yet to be detected in the x-ray : Mercury, the ice giants Uranus/Neptune, the Main Belt comets,KBOs, and the heliopause. • Large Scale WFXT Imaging will allow for direct, co ...
observed
... estimate within our Galaxy, the Milky Way. 1920’s: Edwin Hubble used these Standard Candles (Cepheid Variable stars) to get a much larger distance to Andromeda. Hence S And was 20,000 times brighter than a “normal” nova… Baade therefore dubbed these objects “super-novae”. ...
... estimate within our Galaxy, the Milky Way. 1920’s: Edwin Hubble used these Standard Candles (Cepheid Variable stars) to get a much larger distance to Andromeda. Hence S And was 20,000 times brighter than a “normal” nova… Baade therefore dubbed these objects “super-novae”. ...
Active Galactic Nuclei - University of Toronto
... • Radio output not seen in the visible spectrum – When viewed in the radio spectrum, can see one or two jets emerging ...
... • Radio output not seen in the visible spectrum – When viewed in the radio spectrum, can see one or two jets emerging ...
The Many Faces of the Sun
... the EM spectrum, including radio, optical, UV, soft X-rays, hard X-rays, and γ-rays • Flare emissions are caused by - hot plasma emitting in: radio, visible, UV, soft X-ray -non-thermal energetic particles emitting in: radio, hard Xray, γ-rays ...
... the EM spectrum, including radio, optical, UV, soft X-rays, hard X-rays, and γ-rays • Flare emissions are caused by - hot plasma emitting in: radio, visible, UV, soft X-ray -non-thermal energetic particles emitting in: radio, hard Xray, γ-rays ...
Lecture 1: Welcome to Astronomy 106
... masses > 3 Msun We know of no mechanism to halt the collapse of a compact object with > 3 Msun. It will collapse forming a singularity: A BLACK HOLE! ...
... masses > 3 Msun We know of no mechanism to halt the collapse of a compact object with > 3 Msun. It will collapse forming a singularity: A BLACK HOLE! ...
ChESS: ChaMP Extended Stellar Survey
... pointings. The model of the Galaxy (Bah all & Soneira 1983) is orre t only ...
... pointings. The model of the Galaxy (Bah all & Soneira 1983) is orre t only ...
슬라이드 1
... Protocluster - in qualitative and quantitative agreement : Spatial extent, specific SFR, gas properties, and so on. Quasar - In agreement with with the models of the later phases of massivegalaxy formation when the quasar becomes visible. Unlike for previously described overdensities at z>5: - Stron ...
... Protocluster - in qualitative and quantitative agreement : Spatial extent, specific SFR, gas properties, and so on. Quasar - In agreement with with the models of the later phases of massivegalaxy formation when the quasar becomes visible. Unlike for previously described overdensities at z>5: - Stron ...
Neutron Stars and Black Holes
... Black Holes in Galaxies • BHs may have formed in center when galaxy formed. • Mass of billions of stars in size of SS (Kepler’s 3rd Law). • Black hole likely in center of the Milky Way. ...
... Black Holes in Galaxies • BHs may have formed in center when galaxy formed. • Mass of billions of stars in size of SS (Kepler’s 3rd Law). • Black hole likely in center of the Milky Way. ...
Starending jeopardy
... fuse hydrogen into helium. With no energy source to cause outware pressure the gravity is able to collapse the core and change the star’s structure. ...
... fuse hydrogen into helium. With no energy source to cause outware pressure the gravity is able to collapse the core and change the star’s structure. ...
Supernova scrutiny: Astronomers look inside the heart of a dying
... This latest research used the NuSTAR telescope (short for Nuclear Spectroscopic Telescope Array) astronomers have been able to analyze a previously unexamined section of the X-ray spectrum in supernova remnant Cassiopeia A, a well-observed stellar explosion first spotted in 1947. Other telescopic a ...
... This latest research used the NuSTAR telescope (short for Nuclear Spectroscopic Telescope Array) astronomers have been able to analyze a previously unexamined section of the X-ray spectrum in supernova remnant Cassiopeia A, a well-observed stellar explosion first spotted in 1947. Other telescopic a ...
Solution Set
... There are several possible signals that would prove it is not a black hole, but instead a neutron star. The detection of a pulsar would indicate a spinning neutron star. X-‐ray bursts, from ...
... There are several possible signals that would prove it is not a black hole, but instead a neutron star. The detection of a pulsar would indicate a spinning neutron star. X-‐ray bursts, from ...
Neutron stars, pulsars
... For the Crab pulsar, P = 33 ms so the density must be greater than 1.3× 1011 g cm-3. This exceeds the maximum possible density for a white dwarf, requires a neutron star. ...
... For the Crab pulsar, P = 33 ms so the density must be greater than 1.3× 1011 g cm-3. This exceeds the maximum possible density for a white dwarf, requires a neutron star. ...
Astrophysical X-ray source
Astrophysical X-ray sources are astronomical objects with physical properties which result in the emission of X-rays.There are a number of types of astrophysical objects which emit X-rays, from galaxy clusters, through black holes in active galactic nuclei (AGN) to galactic objects such as supernova remnants, stars, and binary stars containing a white dwarf (cataclysmic variable stars and super soft X-ray sources), neutron star or black hole (X-ray binaries). Some solar system bodies emit X-rays, the most notable being the Moon, although most of the X-ray brightness of the Moon arises from reflected solar X-rays. A combination of many unresolved X-ray sources is thought to produce the observed X-ray background. The X-ray continuum can arise from bremsstrahlung, either magnetic or ordinary Coulomb, black-body radiation, synchrotron radiation, inverse Compton scattering of lower-energy photons be relativistic electrons, knock-on collisions of fast protons with atomic electrons, and atomic recombination, with or without additional electron transitions.Furthermore, celestial entities in space are discussed as celestial X-ray sources. The origin of all observed astronomical X-ray sources is in, near to, or associated with a coronal cloud or gas at coronal cloud temperatures for however long or brief a period.