Sary:The dwarf galaxy NGC 4625.jpg

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English: This new Picture of the Week, taken by the NASA/ESA Hubble Space Telescope, shows the dwarf galaxy NGC 4625, located about 30 million light-years away in the constellation of Canes Venatici (The Hunting Dogs). The image, acquired with the Advanced Camera for Surveys (ACS), reveals the single spiral arm of the galaxy, which gives it an asymmetric appearance. But why is there only one spiral arm, when spiral galaxies normally have at least two? Astronomers looked at NGC 4625 in different wavelengths in the hope of solving this cosmic mystery. Observations in the ultraviolet provided the first hint: in ultraviolet light the disc of the galaxy appears four times larger than on the image depicted here. An indication that there are a large number of very young and hot — hence mainly visible in the ultraviolet — stars forming in the outer regions of the galaxy. These young stars are only around one billion years old, about 10 times younger than the stars seen in the optical centre. At first astronomers assumed that this high star formation rate was being triggered by the interaction with another, nearby dwarf galaxy called NGC 4618. They speculated that NGC 4618 may be the culprit “harassing” NGC 4625, causing it to lose all but one spiral arm. In 2004 astronomers found proof for this claim: The gas in the outermost regions of the dwarf galaxy NGC 4618 has been strongly affected by NGC 4625.
Daty
Loharano https://www.spacetelescope.org/images/potw1746a/
Mpamorona azy ESA/Hubble
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mahalala ny namorona azy voalohany
 ESA/Hubble images, videos and web texts are released by the ESA under the Creative Commons Attribution 4.0 International license and may on a non-exclusive basis be reproduced without fee provided they are clearly and visibly credited. Detailed conditions are below; see the ESA copyright statement for full information. For images created by NASA or on the hubblesite.org website, or for ESA/Hubble images on the esahubble.org site before 2009, use the {{PD-Hubble}} tag.
Conditions:
  • The full image or footage credit must be presented in a clear and readable manner to all users, with the wording unaltered (for example: "ESA/Hubble"). Web texts should be credited to ESA/Hubble (except when used by media). The credit should not be hidden or disassociated from the image footage. Links should be active if the credit is online. See the usage rights Q&A section on the ESA copyright page for guidance.
  • ESA/Hubble materials may not be used to state or imply the endorsement by ESA/Hubble or any ESA/Hubble employee of a commercial product or service.
  • ESA/Hubble requests a copy of the product sent to them to be indexed in their archive.
  • If an image shows an identifiable person, using that image for commercial purposes may infringe that person's right of privacy, and separate permission should be obtained from the individual.
  • If images or visuals are changed significantly from the original work (apart from resizing, cropping), we suggest that the changes are mentioned after the credit line. For example "Original image by ESA/Hubble (M. Kornmesser), warping and recolouring by NN".

Notes:

  • Note that this general permission does not extend to the use of ESA/Hubble's logo, which shall remain protected and may not be used or reproduced without prior and individual written consent of ESA/Hubble.
  • Also note that music, scientific papers and code on the esahubble.org site are not released under this license and can not be used for non-ESA/Hubble products.
  • By reproducing ESA/Hubble material, in part or in full, the user acknowledges the terms on which such use is permitted.
w:fr:Creative Commons
mahalala ny namorona azy voalohany
Ce fichier est disponible selon les termes de la licence Creative Commons Attribution 4.0 International.
Fampatsiahivana: ESA/Hubble
Azonao am-palalahana:
  • ny mizara – ny mandika, mizara sy manome ity vokatr'asa ity
  • ny mamerina – ny manova ity vokatr'asa ity
Raha manaraka ireo fepetra ireo :
  • mahalala ny namorona azy voalohany – Tsy maintsy manome fampahalalana arifomba momba ny mpamorona ianao, manome rohy manondro ny fahazoan'alalana ary raha nisy fiovana natao. Azonao atao amin'izay fomba rehetra azo atao izany zavatra izany, fa tsy amin'ny fomba milaza hoe manohana na manaiky ny fampiasanao an'ilay asa ilay mpamorona.

Navoaka tambanin'ny lisansy

w:fr:Creative Commons
mahalala ny namorona azy voalohany
Ce fichier est disponible selon les termes de la licence Creative Commons Attribution 4.0 International.
Azonao am-palalahana:
  • ny mizara – ny mandika, mizara sy manome ity vokatr'asa ity
  • ny mamerina – ny manova ity vokatr'asa ity
Raha manaraka ireo fepetra ireo :
  • mahalala ny namorona azy voalohany – Tsy maintsy manome fampahalalana arifomba momba ny mpamorona ianao, manome rohy manondro ny fahazoan'alalana ary raha nisy fiovana natao. Azonao atao amin'izay fomba rehetra azo atao izany zavatra izany, fa tsy amin'ny fomba milaza hoe manohana na manaiky ny fampiasanao an'ilay asa ilay mpamorona.
w:fr:Creative Commons
mahalala ny namorona azy voalohany
mahalala ny namorona azy voalohany
 ESA/Hubble images, videos and web texts are released by the ESA under the Creative Commons Attribution 4.0 International license and may on a non-exclusive basis be reproduced without fee provided they are clearly and visibly credited. Detailed conditions are below; see the ESA copyright statement for full information. For images created by NASA or on the hubblesite.org website, or for ESA/Hubble images on the esahubble.org site before 2009, use the {{PD-Hubble}} tag.
Conditions:
  • The full image or footage credit must be presented in a clear and readable manner to all users, with the wording unaltered (for example: "ESA/Hubble"). Web texts should be credited to ESA/Hubble (except when used by media). The credit should not be hidden or disassociated from the image footage. Links should be active if the credit is online. See the usage rights Q&A section on the ESA copyright page for guidance.
  • ESA/Hubble materials may not be used to state or imply the endorsement by ESA/Hubble or any ESA/Hubble employee of a commercial product or service.
  • ESA/Hubble requests a copy of the product sent to them to be indexed in their archive.
  • If an image shows an identifiable person, using that image for commercial purposes may infringe that person's right of privacy, and separate permission should be obtained from the individual.
  • If images or visuals are changed significantly from the original work (apart from resizing, cropping), we suggest that the changes are mentioned after the credit line. For example "Original image by ESA/Hubble (M. Kornmesser), warping and recolouring by NN".

Notes:

  • Note that this general permission does not extend to the use of ESA/Hubble's logo, which shall remain protected and may not be used or reproduced without prior and individual written consent of ESA/Hubble.
  • Also note that music, scientific papers and code on the esahubble.org site are not released under this license and can not be used for non-ESA/Hubble products.
  • By reproducing ESA/Hubble material, in part or in full, the user acknowledges the terms on which such use is permitted.
w:fr:Creative Commons
mahalala ny namorona azy voalohany
Ce fichier est disponible selon les termes de la licence Creative Commons Attribution 4.0 International.
Fampatsiahivana: ESA/Hubble
Azonao am-palalahana:
  • ny mizara – ny mandika, mizara sy manome ity vokatr'asa ity
  • ny mamerina – ny manova ity vokatr'asa ity
Raha manaraka ireo fepetra ireo :
  • mahalala ny namorona azy voalohany – Tsy maintsy manome fampahalalana arifomba momba ny mpamorona ianao, manome rohy manondro ny fahazoan'alalana ary raha nisy fiovana natao. Azonao atao amin'izay fomba rehetra azo atao izany zavatra izany, fa tsy amin'ny fomba milaza hoe manohana na manaiky ny fampiasanao an'ilay asa ilay mpamorona.

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dépeint Frantsay

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13 Novambra 2017

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