Ultraviolet Astronomy
Ultraviolet astronomy
Ultraviolet astronomy is the study of astronomical objects in the ultraviolet portion of the electromagnetic spectrum. Because Earth's atmosphere prevents ultraviolet radiation from reaching its surface, ground-based observatories cannot observe in the ultraviolet. Only with the advent of space-based telescopes has this area of astronomy become available for research. Ultraviolet radiation has a shorter wavelength and more energy than visual radiation, and much of ultraviolet astronomy therefore centers on energetic processes in stars and galaxies. Hot regions of stellar atmospheres, for example, invisible to optical telescopes, reveal a wealth of information to the ultraviolet telescope. The crowded, violent regions at the centers of some galaxies are also prime targets for ultraviolet telescopes.
Ultraviolet radiation
We often refer to electromagnetic radiation in terms of its wavelength, the distance from one peak of a light wave to the next peak. A convenient unit of wavelengthis the Angstrom Ĺ. One Angstrom equals one 10 billionth of a meter.
Visual light, the light our eyes are sensitive to, has wavelengths from about 4,000-7,000 Angstroms. Beyond the visual is infrared light-we cannot see it, but we can feel it as heat. On the short wavelength side of the visual part of the spectrum is the ultraviolet. Ultraviolet (often just called UV) light has wavelengths from 100-4,000 Angstroms.
Earth's atmosphere is opaque to UV light, meaning UV radiation cannot penetrate it. This is fortunate for us, since UV light is what causes sunburn and in sufficiently large doses, skin cancer. Optical telescopes cannot see wavelengths much shorter than 3,600 Angstroms, and to observe UV radiation from astronomical objects it is therefore necessary to go above the atmosphere. Orbiting, space-based telescopes are needed, and only in the past few decades have they been available.
Ultraviolet observatories
Astronomers have developed many different kinds of telescopes besides the familiar optical instruments. Radio, infrared, ultraviolet, x-ray, and gamma-ray telescopes all have unique design requirements to maximize their efficiency in the part of the spectrum they are intended to study.
Like gamma-ray and x-ray telescopes, UV telescopes have only been possible in the era of spaceflight, and the longest lived and most important of these so far has been the International Ultraviolet Explorer. Launched in 1978, IUE was designed to observe the UV sky for five years. Instead, the telescope was not shut down until September 30, 1996, and took tens of thousands of spectra of stars, nebulae, and galaxies.
IUE was a joint project of United States and European space agencies, and was operated for 16 hours each day at the Goddard Space Flight Center in Greenbelt, MD, and for eight hours each day at the Villafranca Satellite Tracking Station in Spain. Astronomers around the world used IUE for their research, and it has been one of the most productive missions in the history of spaceflight.
Despite its glowing track record, IUE had some important limitations. Its primary mirror was only 17 in (45 cm) in diameter, and IUE therefore could not observe very faint objects. Also, its instrumentation was developed in the 1970s and was not as technologically advanced as that available in the 1980s and 1990s. For this reason, a new generation of UV observatories was designed and built.
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UV A performs Drive at their document release party at Dixon Location during the 2010 VERY HOT! Festival on July eight, the year 2010
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… " [The orbiting] Fermi is actually lucky to measure the greatest energy portion of the actual gamma-ray burst emission, that last for hundreds to a large number of seconds – maybe twenty minutes, " described PĂ©ter MĂ©száros, Eberly Seat Professor associated with Astronomy and also Astrophysics … …
Recognition of Light provides a extensive overview of the important ways to photon detection in the ultraviolet towards the submillimeter spectra
Little Missions for Energetic Astrophysics talks about space missions for the 2nd half of the next 10 years and describes current astrophysical issues
The particular solar atmosphere, over a Sun’s surface levels, reaches mega-kelvin temperature ranges and high levels of powerful activity through processes including
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A very important discovery within Astronomy was when Astronomers found that all Stars circle a particular point in the atmosphere. Known as the puro point. On a regular, and crystal clear nigh…
