Glossary term: Astronomia de Raios X
Description: A astronomia de raios X é um campo de estudo dedicado a coletar e analisar todas as informações que vêm do cosmos na forma de radiação eletromagnética muito energética (mais energética que a radiação ultravioleta, mas menos energética que a radiação gama). Os raios X têm frequências entre 30 petahertz e 30 exahertz, o que corresponde a comprimentos de onda entre 10 picômetros e 10 nanômetros. Na unidade de comprimento mais antiga ainda em uso em muitas áreas da astronomia, incluindo a astronomia de raios X, isso corresponde a valores entre 0,1 e 100 angstroms (Å). Dada a proeminência da natureza de partícula da luz nessa parte do espectro, os astrônomos de raios X costumam usar energias de fótons em vez de comprimento de onda para caracterizar o que medem. Em termos de elétrons-volts (eV), a unidade de medida de energia comum na física de partículas, as faixas de frequência e comprimento de onda mencionadas correspondem a energias de fótons entre 100 eV e 100 keV. Como a atmosfera absorve a maioria dos raios X, a astronomia de raios X é normalmente feita por telescópios espaciais. Os raios X provenientes de fontes astronômicas vêm de regiões extremamente quentes. Estas incluem os discos em torno de objetos compactos, como buracos negros ou estrelas de nêutrons, e a coroa quente das estrelas.
Related Terms:
See this term in other languages
Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".
If you notice a factual or translation error in this glossary term or definition then please get in touch.
In Other Languages
- Árabe: علم الفلك بالأشعة السينية
- Alemão: Röntgenastronomie
- Inglês: X-ray Astronomy
- Francês: Astronomie des rayons X
- Hindi: एक्स-रे खगोल विज्ञान
- Italiano: Astronomia a raggi X
- Japonês: X線天文学 (external link)
- Chinês Simplificado: X 射线天文学
- Chinês Tradicional: X 射線天文學
Related Media
Remnant of SN 1006
Caption: This image shows the remnant of the supernova SN 1006. This was probably the result of a white dwarf that accreted so much material from a binary companion star that the white dwarf exploded (this is called a Type 1a supernova by astronomers). This explosion happened several thousand years ago, however it took time for the light from this event to reach Earth, only arriving in the year 1006. This bright explosion was noticed by observers across the Earth and its appearance was noted in the records of many different societies.
Here we see the effect that supernova has had on its surroundings in the galaxy. The force of the explosion has blown a huge bubble in the surrounding interstellar gas with a hot shockwave at its edge. The image appears to be a simple color picture but it actually represents light far beyond what our eye can see. The blue is X-ray data from NASA's Chandra X-ray Observatory, the yellow and orange are data from optical telescopes and the red is detections in radio waves from the Very Large Array and the Green Bank Telescope. The bright blue of the outer shell shows the gas there is very hot and that the explosion produced energetic shock waves.
Credit: X-ray: NASA/CXC/Rutgers/G.Cassam-Chenai, Hughes et al.; Radio: NRAO/AUI/NSF/GBT/VLA/Dyer, Maddalena & Cornwell; Optical: Middlebury College/F.Winkler, NOAO/AURA/NSF/CTIO Schmidt & DSS
credit link
License: PD Public Domain icons
