File:Anatomy of a Photodissociation Region (2021-024-01F5KKSNNM6YWR7MNMDJ2NEBCN).pdf
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Anatomy_of_a_Photodissociation_Region_(2021-024-01F5KKSNNM6YWR7MNMDJ2NEBCN).pdf (600 × 525 pixels, file size: 50 MB, MIME type: application/pdf)
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[edit]DescriptionAnatomy of a Photodissociation Region (2021-024-01F5KKSNNM6YWR7MNMDJ2NEBCN).pdf |
English: This graphic depicts the stratified nature of a photodissociation region (PDR) such as the Orion Bar. Once thought to be homogenous areas of warm gas and dust, PDRs are now known to contain complex structure and four distinct zones. The box at the left shows a portion of the Orion Bar within the Orion Nebula. The box at the top right illustrates a massive star-forming region whose blasts of ultraviolet radiation are affecting a PDR. The box at the bottom right zooms in on a PDR to depict its four, distinct zones: 1) the molecular zone, a cold and dense region where the gas is in the form of molecules and where stars could form; 2) the dissociation front, where the molecules break apart into atoms as the temperature rises; 3) the ionization front, where the gas is stripped of electrons, becoming ionized, as the temperature increases dramatically; and 4) the fully ionized flow of gas into a region of atomic, ionized hydrogen. For the first time, Webb will be able to separate and study these different zones' physical conditions. |
Date | 19 May 2021 (upload date) |
Source | Anatomy of a Photodissociation Region |
Author | ILLUSTRATION: NASA, ESA, CSA, Jason Champion (CNRS), Pam Jeffries (STScI), PDRs4ALL ERS Team |
Licensing
[edit]Public domainPublic domainfalsefalse |
This file is in the public domain because it was created by NASA, ESA and CSA. NASA Webb material is copyright-free and may be freely used as in the public domain without fee, on the condition that only NASA, STScI, and/or ESA/CSA is credited as the source of the material. This license does not apply if source material from other organizations is in use. The material was created for NASA by Space Telescope Science Institute under Contract NAS5-03127. Copyright statement at webbtelescope.org. For material created by the European Space Agency on the esawebb.org site, use the {{ESA-Webb}} tag. |
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current | 22:48, 2 April 2023 | 600 × 525 (50 MB) | OptimusPrimeBot (talk | contribs) | #Spacemedia - Upload of https://stsci-opo.org/STScI-01F6861NR4NZWRM5SC9DQZH6RM.pdf via Commons:Spacemedia |
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Software used | Adobe Photoshop 22.0 (Macintosh) |
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Date and time of digitizing | 06:53, 30 April 2021 |
Date metadata was last modified | 10:31, 21 May 2021 |
File change date and time | 10:31, 21 May 2021 |
Unique ID of original document | xmp.did:1c17384a-9f38-4fbd-9808-ec72076298ec |
Conversion program | Adobe Photoshop for Macintosh -- Image Conversion Plug-in |
Encrypted | no |
Page size | 288 x 252 pts |
Version of PDF format | 1.4 |