Document
... Blazars at very high energies Blazars are powerful gamma-ray sources. The most powerful of them have equivalent isotropic luminosity 1049 erg/s. Collimation θ2/2 ~ 10-2 – 10-3. θ – jet opening angle. EGRET detected 66 (+27) sources of this type. New breakthrough is expected after the launch of GLAS ...
... Blazars at very high energies Blazars are powerful gamma-ray sources. The most powerful of them have equivalent isotropic luminosity 1049 erg/s. Collimation θ2/2 ~ 10-2 – 10-3. θ – jet opening angle. EGRET detected 66 (+27) sources of this type. New breakthrough is expected after the launch of GLAS ...
Stars part 1
... 2. Luminosity – the total amount of energy a star radiates each second. Luminosity of all visible stars range from 1/1,000,000 the luminosity of the sun to 1,000,000 time the luminosity of the sun. 90% of the stars are not as bright as the sun. ...
... 2. Luminosity – the total amount of energy a star radiates each second. Luminosity of all visible stars range from 1/1,000,000 the luminosity of the sun to 1,000,000 time the luminosity of the sun. 90% of the stars are not as bright as the sun. ...
Notes 4, p. 1-3
... How does that energy get out? It is transported, and that transport has great bearing on the structure of the star • Early on, you learned there were three energy trnasport mechanisms: conduction, convection and radiation. We will state without proof that conduction is generally not important in sta ...
... How does that energy get out? It is transported, and that transport has great bearing on the structure of the star • Early on, you learned there were three energy trnasport mechanisms: conduction, convection and radiation. We will state without proof that conduction is generally not important in sta ...
Test - Scioly.org
... D. Secondary Minimum E. Orbital Secondary 56. If the entire X-Axis (as strictly measured on the graph) spans 1.641 units, calculate the approximate period and frequency of the described binary system. A. Period: .876; Frequency: 1.14 B. Period: .853; Frequency: 1.17 C. Period: .821; Frequency: 1.21 ...
... D. Secondary Minimum E. Orbital Secondary 56. If the entire X-Axis (as strictly measured on the graph) spans 1.641 units, calculate the approximate period and frequency of the described binary system. A. Period: .876; Frequency: 1.14 B. Period: .853; Frequency: 1.17 C. Period: .821; Frequency: 1.21 ...
2017 Maryland Regional
... 22. __This object will eventually end it life in a white-dwarf merger to produce a Type Ia supernova. This is the first documented case of a supernova candidate through white-dwarf merger.__ 23. __ The star, Mira, is thermally pulsing every 10,000 years, with each causing it to increase in luminosit ...
... 22. __This object will eventually end it life in a white-dwarf merger to produce a Type Ia supernova. This is the first documented case of a supernova candidate through white-dwarf merger.__ 23. __ The star, Mira, is thermally pulsing every 10,000 years, with each causing it to increase in luminosit ...
Turning AGN Microlensing From a Curiosity Into a Tool
... brightness distribution – better to focus on size versus wavelength, black hole mass etc.. • Only time variability or also observed flux ratios – observed flux ratios are also affected by substructure (satellites) and extinction/absorption, but they are powerful constraints on where you sit in the m ...
... brightness distribution – better to focus on size versus wavelength, black hole mass etc.. • Only time variability or also observed flux ratios – observed flux ratios are also affected by substructure (satellites) and extinction/absorption, but they are powerful constraints on where you sit in the m ...
The Milky Way Galaxy
... Inner 500pc of Galaxy Extinction makes optical studies impossible - use radio or IR Observe ionized gas, line emission, dust, star clusters Stellar density is 107 stars per pc3 (compared to 0.1 in the solar neighborhood) If the Sun were near the GC Nearest star would be 1000AU away A m ...
... Inner 500pc of Galaxy Extinction makes optical studies impossible - use radio or IR Observe ionized gas, line emission, dust, star clusters Stellar density is 107 stars per pc3 (compared to 0.1 in the solar neighborhood) If the Sun were near the GC Nearest star would be 1000AU away A m ...
MilkyWay
... Inner 500pc of Galaxy Extinction makes optical studies impossible - use radio or IR Observe ionized gas, line emission, dust, star clusters Stellar density is 107 stars per pc3 (compared to 0.1 in the solar neighborhood) If the Sun were near the GC Nearest star would be 1000AU away A m ...
... Inner 500pc of Galaxy Extinction makes optical studies impossible - use radio or IR Observe ionized gas, line emission, dust, star clusters Stellar density is 107 stars per pc3 (compared to 0.1 in the solar neighborhood) If the Sun were near the GC Nearest star would be 1000AU away A m ...
White Dwarfs
... Ring due to SN ejecta catching up with pre-SN stellar wind; also observable in X-rays. ...
... Ring due to SN ejecta catching up with pre-SN stellar wind; also observable in X-rays. ...
9.1 Introduction 9.2 Static Models
... Irrespectively of whether they are formulated in Eulerian or Lagrangian coordinates, the four independent equations of stellar structure cannot be solve analytically without making some simplifying assumptions. The reasons are that: (i) the equations are very non linear. The energy generation rate E ...
... Irrespectively of whether they are formulated in Eulerian or Lagrangian coordinates, the four independent equations of stellar structure cannot be solve analytically without making some simplifying assumptions. The reasons are that: (i) the equations are very non linear. The energy generation rate E ...
Interstellar Medium (ISM) Interstellar Extinction Star Formation
... Consider the forces acting on a `star forming unit’ within a molecular cloud - a molecular cloud core: ...
... Consider the forces acting on a `star forming unit’ within a molecular cloud - a molecular cloud core: ...
1-1 H. Color Index: A color index is the difference of two color
... Distance modulus is an indicator of the distance of an object expressed in terms of its absolute and apparent magnitudes. More specifically, distance modulus is defined as m-M. If the distance modulus is 0, the object is 10 parsecs distant. If m-M is less than zero or negative, this means the object ...
... Distance modulus is an indicator of the distance of an object expressed in terms of its absolute and apparent magnitudes. More specifically, distance modulus is defined as m-M. If the distance modulus is 0, the object is 10 parsecs distant. If m-M is less than zero or negative, this means the object ...
Star formation, feedback and the role of SNe II and SNe Ia in the
... obtained 1995 ranging so that M/Lv agrees We Weconstruct choose several a one Halo parameter sequences family offollowing instantaneous modelsBurkert of galaxies bursts differing from in number 10^6after each istantaneous burst. Stochastically distributed in space proportionally with in observations ...
... obtained 1995 ranging so that M/Lv agrees We Weconstruct choose several a one Halo parameter sequences family offollowing instantaneous modelsBurkert of galaxies bursts differing from in number 10^6after each istantaneous burst. Stochastically distributed in space proportionally with in observations ...
Death by Black Hole Study Guide-Answers - crespiphysics
... 4. How can a gamma-ray photon produce over one million visible and IR photons by the time it reaches the sun’s surface? Through absorption and re-emission 5. What drives convection currents in the sun? Gamma-ray photos rushing out from the core Chapter 7: Planet Parade 1. The Greek word “planete” me ...
... 4. How can a gamma-ray photon produce over one million visible and IR photons by the time it reaches the sun’s surface? Through absorption and re-emission 5. What drives convection currents in the sun? Gamma-ray photos rushing out from the core Chapter 7: Planet Parade 1. The Greek word “planete” me ...
Introduction to Stars: Their Properties
... Define brightness (see text), apparent magnitude, absolute magnitude. ...
... Define brightness (see text), apparent magnitude, absolute magnitude. ...
View Sample Pages
... In 2011, scientists at the National Aeronautics and disk to heat up and generate x-rays. The x-rays then Space Administration and the European Space propagate through space. Scientists look for these xAgency were able to use the Hubble Space Telescope rays in order to identify the probable location ...
... In 2011, scientists at the National Aeronautics and disk to heat up and generate x-rays. The x-rays then Space Administration and the European Space propagate through space. Scientists look for these xAgency were able to use the Hubble Space Telescope rays in order to identify the probable location ...
Test 3 Review
... some electrons bound to nuclei => radiation can't get through => heats gas, hot gas rises, cool gas falls ...
... some electrons bound to nuclei => radiation can't get through => heats gas, hot gas rises, cool gas falls ...
Hubble Science Briefing: The Real World: Black Hole Edition
... But, direct observation is difficult (after all, light cannot escape a black hole)! However, we can observe indirect signatures that point to a black hole. One case of this are systems called X-ray binaries. ...
... But, direct observation is difficult (after all, light cannot escape a black hole)! However, we can observe indirect signatures that point to a black hole. One case of this are systems called X-ray binaries. ...
Hubble Science Briefing: The Real World: Black Hole Edition
... But, direct observation is difficult (after all, light cannot escape a black hole)! However, we can observe indirect signatures that point to a black hole. One case of this are systems called X-ray binaries. ...
... But, direct observation is difficult (after all, light cannot escape a black hole)! However, we can observe indirect signatures that point to a black hole. One case of this are systems called X-ray binaries. ...
Chapter 11: Stars
... temperature can only be inferred from models. • Surface T is easier to measure than its luminosity because it does not depend on distance. ...
... temperature can only be inferred from models. • Surface T is easier to measure than its luminosity because it does not depend on distance. ...
Lecture 24: High Mass Star Formation Astro 6890/8980 Prof. Tom
... Core: thermal pressure in rough balance with gravity (may not exist for massive stars). Isothermal and optically thin to IR and radio wavelengths. ...
... Core: thermal pressure in rough balance with gravity (may not exist for massive stars). Isothermal and optically thin to IR and radio wavelengths. ...
Document
... Sir Arthur Eddington (1882 – 1944) „At first sight it would seem that the deep interior of the sun and stars is less accessible to scientific investigation than any other region of the universe.” ...
... Sir Arthur Eddington (1882 – 1944) „At first sight it would seem that the deep interior of the sun and stars is less accessible to scientific investigation than any other region of the universe.” ...
Cygnus X-1
Cygnus X-1 (abbreviated Cyg X-1) is a well-known galactic X-ray source, thought to be a black hole, in the constellation Cygnus. It was discovered in 1964 during a rocket flight and is one of the strongest X-ray sources seen from Earth, producing a peak X-ray flux density of 6977229999999999999♠2.3×10−23 Wm−2 Hz−1 (7003230000000000000♠2.3×103 Jansky). Cygnus X-1 was the first X-ray source widely accepted to be a black hole and it remains among the most studied astronomical objects in its class. The compact object is now estimated to have a mass about 14.8 times the mass of the Sun and has been shown to be too small to be any known kind of normal star, or other likely object besides a black hole. If so, the radius of its event horizon is about 7004440000000000000♠44 km.Cygnus X-1 belongs to a high-mass X-ray binary system about 7019574266339685654♠6070 ly from the Sun that includes a blue supergiant variable star designated HDE 226868 which it orbits at about 0.2 AU, or 20% of the distance from the Earth to the Sun. A stellar wind from the star provides material for an accretion disk around the X-ray source. Matter in the inner disk is heated to millions of degrees, generating the observed X-rays. A pair of jets, arranged perpendicular to the disk, are carrying part of the energy of the infalling material away into interstellar space.This system may belong to a stellar association called Cygnus OB3, which would mean that Cygnus X-1 is about five million years old and formed from a progenitor star that had more than 7001400000000000000♠40 solar masses. The majority of the star's mass was shed, most likely as a stellar wind. If this star had then exploded as a supernova, the resulting force would most likely have ejected the remnant from the system. Hence the star may have instead collapsed directly into a black hole.Cygnus X-1 was the subject of a friendly scientific wager between physicists Stephen Hawking and Kip Thorne in 1975, with Hawking betting that it was not a black hole. He conceded the bet in 1990 after observational data had strengthened the case that there was indeed a black hole in the system. This hypothesis has not been confirmed due to a lack of direct observation but has generally been accepted from indirect evidence.