poster
... Abstract. DG Tau is a classical T Tauri star showing an unusual X-ray spectrum, best described by two thermal components with different absorption columns. The soft X-rays are less absorbed than the hard X-rays, presumably coronal, component. This rules out stellar accretion as the origin of the sof ...
... Abstract. DG Tau is a classical T Tauri star showing an unusual X-ray spectrum, best described by two thermal components with different absorption columns. The soft X-rays are less absorbed than the hard X-rays, presumably coronal, component. This rules out stellar accretion as the origin of the sof ...
Bruno Maffei/C. OʼSullivan, Lens vs mirror telescope - B-Pol
... • FP diameter = 250mm diameter • Size limited by filter diameter not by aberrations • Flat Focal Plane • Edge pixel eccentricity ~ 0.02 ...
... • FP diameter = 250mm diameter • Size limited by filter diameter not by aberrations • Flat Focal Plane • Edge pixel eccentricity ~ 0.02 ...
High-Energy Astrophysics - University of Iowa Astrophysics
... p = parallax angle of that star in arcseconds 1 parsec = 3.26 light years = 3.0861018 cm ...
... p = parallax angle of that star in arcseconds 1 parsec = 3.26 light years = 3.0861018 cm ...
15 Years of Science with XMM-Newton
... small planetary phase range of Φ = 0.55-0.65 Quiescent spectrum: two temperatures at 0.2 keV and 0.7 keV During the flares a third component at 0.9 keV Flaring structure as big as four stellar radii. Magnetic field in this loop: 40 - 110 G ...
... small planetary phase range of Φ = 0.55-0.65 Quiescent spectrum: two temperatures at 0.2 keV and 0.7 keV During the flares a third component at 0.9 keV Flaring structure as big as four stellar radii. Magnetic field in this loop: 40 - 110 G ...
MCERLEAN_2007 - Armagh Observatory
... • The angle was found to be 15.7°. One method of measuring the resolution of the lens is to measure the Modulation Transfer Function (MTF). This describes the response of an optical system to an image decomposed into sine waves. It is also known as the Spatial Frequency Response. MTF quantifies the ...
... • The angle was found to be 15.7°. One method of measuring the resolution of the lens is to measure the Modulation Transfer Function (MTF). This describes the response of an optical system to an image decomposed into sine waves. It is also known as the Spatial Frequency Response. MTF quantifies the ...
Gaia Fact Sheet
... of important problems related to the origin, structure, and evolutionary history of our galaxy. GAIA structure ...
... of important problems related to the origin, structure, and evolutionary history of our galaxy. GAIA structure ...
observations
... A) No astronomical objects produce these kinds of light B) The atmosphere blocks these types of light C) No mirrors or lenses have ever been discovered that can reflect/refract these kinds of light D) Film and CCD cameras can’t detect these types of light ...
... A) No astronomical objects produce these kinds of light B) The atmosphere blocks these types of light C) No mirrors or lenses have ever been discovered that can reflect/refract these kinds of light D) Film and CCD cameras can’t detect these types of light ...
10.4 Observing the Universe
... For a long time, people have looked up in the sky and seen patterns that they named after characters in stories, animals, and other common things. Many of the names given to these groups of stars by ancient cultures remain today and are called constellations. Astronomers use constellations to locate ...
... For a long time, people have looked up in the sky and seen patterns that they named after characters in stories, animals, and other common things. Many of the names given to these groups of stars by ancient cultures remain today and are called constellations. Astronomers use constellations to locate ...
The Great Observatories - Center for STEM Education
... method is only accurate for stars within a few hundred light-years of Earth, since when the stars are very far away, the parallax shift is too small to measure. The method of measuring distance to stars beyond 100 light-years is to use Cepheid variable stars. These stars change in brightness over ti ...
... method is only accurate for stars within a few hundred light-years of Earth, since when the stars are very far away, the parallax shift is too small to measure. The method of measuring distance to stars beyond 100 light-years is to use Cepheid variable stars. These stars change in brightness over ti ...
Light and Telescopes
... Light hits Matter: Refraction • Light travels at different speeds in vacuum, air, and other substances • When light hits the material at an angle, part of it slows down while the rest continues at the original speed – results in a change of direction – Different colors bend different amounts – pris ...
... Light hits Matter: Refraction • Light travels at different speeds in vacuum, air, and other substances • When light hits the material at an angle, part of it slows down while the rest continues at the original speed – results in a change of direction – Different colors bend different amounts – pris ...
Light, radiation, telescopes
... Wavelength Frequency All types travel at same speed… 300,000 km/s = c ...
... Wavelength Frequency All types travel at same speed… 300,000 km/s = c ...
PowerPoint - Chandra X
... Chandra X-ray Observatory ACIS/HETG Image; total exposure time: 10.6 hours ...
... Chandra X-ray Observatory ACIS/HETG Image; total exposure time: 10.6 hours ...
Telescopes
... Telescopes also observe infrared, UV, X-rays and gamma rays. These mostly done from space because of Earth's atmosphere. ...
... Telescopes also observe infrared, UV, X-rays and gamma rays. These mostly done from space because of Earth's atmosphere. ...
ppt - UCL
... High-resolution RGS spectra allowed us to determine the absorbing column density for the X-ray emitting region. From the depth of the O I absorption edge, we infer an intrinsic nH <~ 1020 cm-2 (figure above). This rules out wind accretion as the main mechanism of mass transfer, and suggests that acc ...
... High-resolution RGS spectra allowed us to determine the absorbing column density for the X-ray emitting region. From the depth of the O I absorption edge, we infer an intrinsic nH <~ 1020 cm-2 (figure above). This rules out wind accretion as the main mechanism of mass transfer, and suggests that acc ...
X-ray spectrometer
... sensitivity (~ 10-11 erg/cm2/s), nearing the end of its lifetime – Swift: reasonable sensitivity, quick slew, all-sky pointing, but low Earth orbit, GRBs a priority – Chandra: v. good for structure studies (extended jets), but suffers from photon pile-up for bright sources. Great for difficult IDs! ...
... sensitivity (~ 10-11 erg/cm2/s), nearing the end of its lifetime – Swift: reasonable sensitivity, quick slew, all-sky pointing, but low Earth orbit, GRBs a priority – Chandra: v. good for structure studies (extended jets), but suffers from photon pile-up for bright sources. Great for difficult IDs! ...
Slide 1 - Hoover12
... • Wavelength Coverage: 3 - 180 microns • Telescope: 85 cm diameter (33.5 Inches), cooled to < 5.5 K ...
... • Wavelength Coverage: 3 - 180 microns • Telescope: 85 cm diameter (33.5 Inches), cooled to < 5.5 K ...
Introduction - University of Iowa Astrophysics
... • Students may work together on problem sets, but please write up your own answers • Form groups of 2 for the data analysis project • There will be both written and oral presentations of the project. During the oral presentation, questions will be asked of individual students. ...
... • Students may work together on problem sets, but please write up your own answers • Form groups of 2 for the data analysis project • There will be both written and oral presentations of the project. During the oral presentation, questions will be asked of individual students. ...
- Fermi Gamma-ray Space Telescope
... scattering – where they stop interacting with matter and travel freely through space CMBR photons emanate from a cosmic photosphere – like the surface of the Sun – except that we inside it looking out The cosmic photosphere has a temperature which characterizes the radiation that is emitted It has c ...
... scattering – where they stop interacting with matter and travel freely through space CMBR photons emanate from a cosmic photosphere – like the surface of the Sun – except that we inside it looking out The cosmic photosphere has a temperature which characterizes the radiation that is emitted It has c ...
Non-Optical Telescopes
... • Why put a telescope in orbit? • Gets it above the atmosphere with all its dust, ozone, water vapor, and CO2 that absorb so much of what we want to see. • What’s the most famous orbiting telescope? If you said the Hubble Space Telescope or HST, you’re right! ...
... • Why put a telescope in orbit? • Gets it above the atmosphere with all its dust, ozone, water vapor, and CO2 that absorb so much of what we want to see. • What’s the most famous orbiting telescope? If you said the Hubble Space Telescope or HST, you’re right! ...
XMM-Newton
The XMM-Newton, also known as the X-ray Multi-Mirror Mission and the High Throughput X-ray Spectroscopy Mission, is an orbiting X-ray observatory launched by ESA in December 1999 on an Ariane 5 rocket. It is named in honor of Sir Isaac Newton. The telescope was placed in a very eccentric 48 hour elliptical orbit at 40°; at its apogee it is nearly 114,000 kilometres (71,000 mi) from Earth, while the perigee is only 7,000 kilometres (4,300 mi).