Giant Molecular Clouds and Gravitational Stability
... • Properties of the gas: – Gas mostly in molecular form: hydrogen in H2, carbon in CO, oxygen in O (O2?), nitrogen in N2(?). – At the edges of molecular clouds: transition to atomic species. “Photo-Dissociation Regions” (PDRs). – H2 cannot be easily observed. Therefore CO often used as tracer. ...
... • Properties of the gas: – Gas mostly in molecular form: hydrogen in H2, carbon in CO, oxygen in O (O2?), nitrogen in N2(?). – At the edges of molecular clouds: transition to atomic species. “Photo-Dissociation Regions” (PDRs). – H2 cannot be easily observed. Therefore CO often used as tracer. ...
Lecture 2. Isolated Neutron Stars – I.
... They were neutron stars in close binary systems, BUT ... .... they were «not recognized».... Now we know hundreds of X-ray binaries with neutron stars in the Milky Way and in other galaxies. ...
... They were neutron stars in close binary systems, BUT ... .... they were «not recognized».... Now we know hundreds of X-ray binaries with neutron stars in the Milky Way and in other galaxies. ...
The history of a discovery - Institut d`Astrophysique Spatiale
... visible vs infrared output • the heavy elements (and associated dust) abundance in the universe is increasing with time • a naïve view would thus predict a decreasing FIR/visible ratio with redshift • a few galaxies had been shown to have a large ratio but the bulk of the galaxies were expected to h ...
... visible vs infrared output • the heavy elements (and associated dust) abundance in the universe is increasing with time • a naïve view would thus predict a decreasing FIR/visible ratio with redshift • a few galaxies had been shown to have a large ratio but the bulk of the galaxies were expected to h ...
cosmic microwave background and foregrounds
... The galaxy is an hot system, 20 K or so, not isolated because heated back by starlight The galaxy possesses a magnetic field of order 10-10 Tesla, with a large scale component orthogonal to the plane and elongated along arms, and a largely unknown small scale component ...
... The galaxy is an hot system, 20 K or so, not isolated because heated back by starlight The galaxy possesses a magnetic field of order 10-10 Tesla, with a large scale component orthogonal to the plane and elongated along arms, and a largely unknown small scale component ...
Full PDF
... Quasars are extremely distant objects in our known universe. They are the furthest objects away from our galaxy that can be seen. Quasars are extremely bright masses of energy and light. The name quasar is actually short for quasi-stellar radio source or quasi-stellar object. They are the brightest ...
... Quasars are extremely distant objects in our known universe. They are the furthest objects away from our galaxy that can be seen. Quasars are extremely bright masses of energy and light. The name quasar is actually short for quasi-stellar radio source or quasi-stellar object. They are the brightest ...
Information (Word Doc)
... Gravity pulls the materials together. Compressing the gas and dust into a giant ball that, at it’s centre temperatures are 15 million degrees or so (created by all gas and dust bumping into each other under the great pressure of the surrounding material). The pressure at the centre of the ball becom ...
... Gravity pulls the materials together. Compressing the gas and dust into a giant ball that, at it’s centre temperatures are 15 million degrees or so (created by all gas and dust bumping into each other under the great pressure of the surrounding material). The pressure at the centre of the ball becom ...
Single Pixel Cameras wall panels
... of the head, but interestingly, each image is spatially identical. In other words, even though the detectors are in different positions, they do not provide different perspectives. Instead, the location of the detectors determines the apparent illumination in each image, and the perspective of the i ...
... of the head, but interestingly, each image is spatially identical. In other words, even though the detectors are in different positions, they do not provide different perspectives. Instead, the location of the detectors determines the apparent illumination in each image, and the perspective of the i ...
Max_SCRD_v3
... • Kinematics (velocity profile) • Stellar population information • star formation history as a function of z ...
... • Kinematics (velocity profile) • Stellar population information • star formation history as a function of z ...
Particles: Newton Waves: Huygens, Young, Fresnel
... Sir David Brewster (1781 – 1868) -- a professor in Scotland -- studied light and optics -- invented and developed many optical instruments -- most famous invention — the kaleidoscope -- most famous discovery — reflected light is partially or fully polarized (Brewster’s angle) It was said of him tha ...
... Sir David Brewster (1781 – 1868) -- a professor in Scotland -- studied light and optics -- invented and developed many optical instruments -- most famous invention — the kaleidoscope -- most famous discovery — reflected light is partially or fully polarized (Brewster’s angle) It was said of him tha ...
expert groups - 10sc1-p1-rev
... b microwaves: including cooking, communications and satellite transmissions c infrared: including cooking, thermal imaging, short range communications, optical fibres, television remote controls and security systems d visible light: including vision, photography and illumination e ultraviolet: inclu ...
... b microwaves: including cooking, communications and satellite transmissions c infrared: including cooking, thermal imaging, short range communications, optical fibres, television remote controls and security systems d visible light: including vision, photography and illumination e ultraviolet: inclu ...
Light Years
... 3. How is a “student minute” different from a “light year”? A student minute is different from a light year, because the speed of light is constant and travels at a much faster rate, unlike the student. 4. Why do astronomers use light years instead of kilometers to measure distances in the universe? ...
... 3. How is a “student minute” different from a “light year”? A student minute is different from a light year, because the speed of light is constant and travels at a much faster rate, unlike the student. 4. Why do astronomers use light years instead of kilometers to measure distances in the universe? ...
Chapter 15
... • Deep within the core lies an incredibly small (10 AU diameter) radio source known as Sgr A* • A 106 M black hole may occupy the very center of the galaxy, although other explanations have been given ...
... • Deep within the core lies an incredibly small (10 AU diameter) radio source known as Sgr A* • A 106 M black hole may occupy the very center of the galaxy, although other explanations have been given ...
9. The very beginning - Mullard Space Science Laboratory
... ceased, the majority of the energy density of the Universe was in radiation. • After 10,000 years, the expansion had caused the temperature to drop enough for the density of matter to exceed the density of radiation. ...
... ceased, the majority of the energy density of the Universe was in radiation. • After 10,000 years, the expansion had caused the temperature to drop enough for the density of matter to exceed the density of radiation. ...
cosmo_01_overview - Mullard Space Science Laboratory
... What is to be covered in the course: • Galaxies: – what they are, the different types, clustering – high redshift quasars, giant starbursts and evolution ...
... What is to be covered in the course: • Galaxies: – what they are, the different types, clustering – high redshift quasars, giant starbursts and evolution ...
binary stars - El Camino College
... 1. Spectroscopic Binaries - These stars orbit so closely to each other that they appear as a single star even through the best telescopes on Earth. Their binary character is revealed in their spectra, which reveal absorption lines from two different stars that are regularly Doppler blueshifted and r ...
... 1. Spectroscopic Binaries - These stars orbit so closely to each other that they appear as a single star even through the best telescopes on Earth. Their binary character is revealed in their spectra, which reveal absorption lines from two different stars that are regularly Doppler blueshifted and r ...
Goal: To understand the HR diagram
... stars of vastly (a factor of a trillion) different brightnesses on a single scale. • Bigger numbers mean dimmer, smaller brighter. • Each “color” has its own scale – and all are calibrated to Vega. ...
... stars of vastly (a factor of a trillion) different brightnesses on a single scale. • Bigger numbers mean dimmer, smaller brighter. • Each “color” has its own scale – and all are calibrated to Vega. ...
LED and ILED
... type of electronic device that emits infrared light not visible to the naked eye. An infraredLED operates like a regular LED, but may use different materials to produce infrared light. ...
... type of electronic device that emits infrared light not visible to the naked eye. An infraredLED operates like a regular LED, but may use different materials to produce infrared light. ...
PPT
... Interplanetary CMEs may exhibit three relevant radio emission mechanisms: bremsstrahlung, gyrosynchrotron emission and plasma emission. Bremsstrahlung is produced by Coulomb collisions between charged particles in plasmas. Gyrosynchrotron emission is the electromagnetic emission generated by mildly ...
... Interplanetary CMEs may exhibit three relevant radio emission mechanisms: bremsstrahlung, gyrosynchrotron emission and plasma emission. Bremsstrahlung is produced by Coulomb collisions between charged particles in plasmas. Gyrosynchrotron emission is the electromagnetic emission generated by mildly ...
Exam 1 practice questions
... 9. Telescopes & observing Stars appear to twinkle as their light passes through the atmosphere. “Twinkling” is called “atmospheric seeing” by astronomers. It happens because 1. Layers of the atmosphere are at different temperatures and densities, so the light bends as it passes through them 2. mole ...
... 9. Telescopes & observing Stars appear to twinkle as their light passes through the atmosphere. “Twinkling” is called “atmospheric seeing” by astronomers. It happens because 1. Layers of the atmosphere are at different temperatures and densities, so the light bends as it passes through them 2. mole ...
Astronomical spectroscopy
Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation, including visible light, which radiates from stars and other hot celestial objects. Spectroscopy can be used to derive many properties of distant stars and galaxies, such as their chemical composition, temperature, density, mass, distance, luminosity, and relative motion using Doppler shift measurements.