| Risultati della ricerca nelle immagini - "Chandra" |
Abell-520.jpgAbell 520: Cluster Crash Illuminates Dark Matter Conundrum100 visite"...Risponderò come da me si suole
Liberi sensi, in libere parole..."
T. Tasso, "Gerusalemme Liberata", 2, 81MareKromium
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Anomalous Object.jpgObject #3 53.057987-27.83352471 visite"...Non credo che esistano risposte realmente impossibili. Credo però che esistano domande poste male..."
P.C. Floegers - "In the Paradox"
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Binary Black Hole.jpgBinary Black Hole in 3C 7587 visite"...Docti non solum vivi atque presentes studiosos discendi erudiunt atque docent, sed hoc idem etiam post mortem monumentis litterarum assequuntur..."
(Cicerone)
"...I veri sapienti insegnano non solo durante la loro vita, ma anche una volta defunti, grazie alle Opere che ci lasciano..."
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Cassiopeia_A-PIA11748.jpgSNR Cassiopeia "A"55 visiteFor the first time, a multiwavelength three-dimensional reconstruction of a SuperNova Remnant has been created. This stunning visualization of Cassiopeia A, or Cas A, the result of an explosion approximately 330 years ago, uses data from several telescopes: X-ray data from NASA's Chandra X-ray Observatory, InfraRed data from NASA's Spitzer Space Telescope and optical data from the National Optical Astronomy Observatory 4-meter telescope at Kitt Peak, Ariz., and the Michigan-Dartmouth-MIT 2.4-meter telescope, also at Kitt Peak. In this visualization, the green region is mostly Iron observed in X-rays. The yellow region is a combination of Argon and Silicon seen in X-rays, optical, and infrared — including jets of Silicon — plus outer debris seen in the optical. The red region is cold debris seen in the infrared. Finally, the blue reveals the outer blast wave, most prominently detected in X-rays.
Most of the material shown in this visualization is debris from the explosion that has been heated by a shock moving inwards. The red material interior to the yellow/orange ring has not yet encountered the inward moving shock and so has not yet been heated. These unshocked debris were known to exist because they absorb background radio light, but they were only recently discovered in infrared emission with Spitzer. The blue region is composed of gas surrounding the explosion that was heated when it was struck by the outgoing blast wave, as clearly seen in Chandra images.
To create this visualization, scientists took advantage of both a previously known phenomenon — the Doppler effect — and a new technology that bridges astronomy and medicine. When elements created inside a supernova, such as Iron, Silicon and Argon, are heated they emit light at certain wavelengths. Material moving towards the observer will have shorter wavelengths and material moving away will have longer wavelengths. Since the amount of the wavelength shift is related to the speed of motion, one can determine how fast the debris are moving in either direction.
Because Cas A is the result of an explosion, the stellar debris is expanding radially outwards from the explosion center. Using simple geometry, the scientists were able to construct a 3-D model using all of this information. A program called 3-D Slicer — modified for astronomical use by the Astronomical Medicine Project at Harvard University in Cambridge, Mass. — was used to display and manipulate the 3-D model. Commercial software was then used to create the 3-D fly-through.
The blue filaments defining the blast wave were not mapped using the Doppler Effect because they emit a different kind of light —synchrotron radiation — that does not emit light at discrete wavelengths, but rather in a broad continuum. The blue filaments are only a representation of the actual filaments observed at the blast wave.
This visualization shows that there are two main components to this supernova remnant: a spherical component in the outer parts of the remnant and a flattened (disk-like) component in the inner region. The spherical component consists of the outer layer of the star that exploded, probably made of helium and carbon. These layers drove a spherical blast wave into the diffuse gas surrounding the star.
The flattened component — that astronomers were unable to map into 3-D prior to these Spitzer observations — consists of the inner layers of the star. It is made from various heavier elements, not all shown in the visualization, such as Oxygen, Neon, Silicon, Sulphur, Argon and Iron.
High-velocity plumes, or jets, of this material are shooting out from the explosion in the plane of the disk-like component mentioned above. Plumes of Silicon appear in the North/East and South/West, while those of Iron are seen in the South/East and North. These jets were already known and Doppler velocity measurements have been made for these structures, but their orientation and position with respect to the rest of the debris field had never been mapped before now.
This new insight into the structure of Cas A gained from this 3-D visualization is important for astronomers who build models of supernova explosions. Now, they must consider that the outer layers of the star come off spherically, but the inner layers come out more disk-like with high-velocity jets in multiple directions.MareKromium
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Centaurus_A.jpgActive Galaxy "Centaurus A"53 visite"...Ego vero nihil impossibile arbitror; sed utcumque Fata decreverint, ita cuncta mortalibus provenire..."
(Apuleio)
"...Io credo che nulla vi sia (a questo Mondo) di (realmente) impossibile; tuttavia, qualsiasi evento gli Dei abbiano decretato che debba accadere, accadrà..." (trad. libera)MareKromium
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Centaurus_A~1.jpgCentaurus A121 visite"...millantatore è colui il quale fa mostra di titoli che non possiede, così esagerando (agli occhi degli altri) il controllo che ha sulle cose del Mondo; un controllo di cui egli, in realtà, è del tutto privo..."
Aristotele
MareKromium
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Centaurus_Region~0.jpgCentaurus Region54 visite"...Aquila muscas non captat..."
(Binder)
"...L'Aquila non cattura le mosche..."MareKromium
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G_54-PIA12982_modest.jpgDusty and Dead74 visite"...Without Freedom of Choice, there is no Creativity. And without Creativity, there is no Life..."
dal telefilm"Star Trek" (Serie Classica "Old Timers" - Episodio "Il ritorno degli Arconti")
MareKromium
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Galaxy Cluster 1-E-0657-556.jpg1-E 0657-556 Galaxy Cluster (HST)86 visite"...Le uniche Leggi che sono sucettibili di incutere timore e che quindi sono idonee a perseguire la funzione per cui esse furono create sono quelle che, in caso di una loro violazione, prevedono l'applicazione certa ed immediata di una sanzione.
Ed a tal riguardo mi permetto di sottolineare che non esistono Leggi Buone, nè Leggi Cattive e che non fanno parte di questo Mondo nè le Sanzioni Blande, nè quelle Esemplari: esistono solo Leggi.
Leggi Umane, creati da Uomini e fatte per gli Uomini; Leggi che vanno rispettate...".
P.C. Floegers - "Scritti di Cronaca e Sociale"
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IC-0443.jpgIC 443 - The "Jellyfish Nebula"76 visite"...Dagli Imperatori dell'antica Roma, al caso Nixon e sino ai giorni nostri (passando per i totalitarismi del Novecento), la Propaganda si fonda sempre sullo stesso meccanismo: sostituire al ragionamento del Singolo l'opinione della "Massa"..."
Paolo Cortesi
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J1337-29_crop1-1000.jpgJ 1337-29 - Spiral Galaxy61 visite"...Rebus in angustis facile est contemnere vitam;
Fortiter ille facit, qui miser esse potest..."
(Marziale)
"...nelle sventure è facile disprezzare la vita; ma rende forti il saperle sopportare..." (lett.: rende uomini il saper essere miseri)
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M 82-PIA08093.jpgM 82: A "Space Rainbow"55 visiteCaption NASA originale:"NASA's Spitzer, Hubble and Chandra Space Observatories teamed up to create this multi-wavelength, false-colored view of the M82 galaxy.
The lively portrait celebrates Hubble's "sweet sixteen" birthday.
X-ray data recorded by Chandra appears in blue; infrared light recorded by Spitzer appears in red; Hubble's observations of hydrogen emission appear in orange, and the bluest visible light appears in yellow-green".
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