File:Caldwell 44.jpg
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DescriptionCaldwell 44.jpg |
English: In this Hubble image of Caldwell 44, also known as NGC 7479, the tightly wound arms of the barred spiral galaxy create a backward "S" as they spin in a counter-clockwise direction. However, this galaxy, nicknamed the Propeller galaxy, emits a jet of radiation in radio wavelengths that bends in the opposite direction to the stars and dust in the arms of the galaxy. Astronomers think that the radio jet was put into its bizarre backward spin after the Propeller galaxy merged with another galaxy.
The Propeller galaxy is an interesting subject for several other reasons as well. Hidden within the galaxy’s core lurks a supermassive black hole that feeds on large quantities of gas. The galaxy has also been the home to two recent supernovae, one witnessed in 1990 and the other in 2009. Supernova explosions blast stellar material back into the cosmos to be used in subsequent generations of stars. The Propeller galaxy is making rapid use of this recycled material as it undergoes starburst activity, with many bright, young stars peeking out of the spiral arms and disk. The three brightest stars in this image, however, are foreground stars — caught on camera because they lie between us and the galaxy. This image was taken in visible and infrared light with Hubble’s Advanced Camera for Surveys. The observations were taken to study the galaxy’s most recent supernova, SN 2009jf. Astronomers have also used Hubble to investigate star formation in Caldwell 44. Discovered by astronomer William Herschel in 1784, the Propeller galaxy can be found in the constellation Pegasus. However, at a distance of 110 million light-years from Earth, this magnitude-10.8 galaxy is hidden from the naked eye. Use a medium to large telescope to look for Caldwell 44 in autumn night skies from the Northern Hemisphere, or in spring skies from the Southern Hemisphere. For more information about Hubble’s observations of Caldwell 44, see: www.spacetelescope.org/images/potw1125a/ Credit: ESA/Hubble & NASA For Hubble's Caldwell catalog site and information on how to find these objects in the night sky, visit: www.nasa.gov/content/goddard/hubble-s-caldwell-catalog |
Date | |
Source | https://www.flickr.com/photos/144614754@N02/49201013441/ |
Author | NASA Hubble |
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This image was originally posted to Flickr by NASA Hubble at https://flickr.com/photos/144614754@N02/49201013441 (archive). It was reviewed on 23 February 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
23 February 2020
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Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Date and time of data generation | 10:00, 20 June 2011 |
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Short title | Spiral spins both ways |
Credit/Provider | ESA/Hubble & NASA |
Source | ESA/Hubble |
Image title | In this NASA/ESA Hubble Space Telescope image of NGC 7479 — created from observations at visible and near-infrared wavelengths — the tightly wound arms of the spiral galaxy create an inverted ‘S’, as they spin in an anticlockwise direction. However, at radio wavelengths, this galaxy, sometimes nicknamed the Propeller Galaxy, spins the other way, with a jet of radiation that bends in the opposite direction to the stars and dust in the arms of the galaxy. Astronomers think that the radio jet in NGC 7479 was put into its bizarre backwards spin following a merger with another galaxy. Star formation is reignited by galactic collisions, and indeed NGC 7479 is undergoing starburst activity, with many bright, young stars visible in the spiral arms and disc. The three brightest stars in this image, however, are foreground stars — caught on camera because they lie between the galaxy and Hubble. This striking galaxy is easily visible in moderate telescopes as an elongated fuzzy patch of light. The spiral arms can be seen with more difficulty in larger telescopes under dark conditions. This picture was created from images taken with the Wide Field Channel of Hubble’s Advanced Camera for Surveys. Images through a yellow filter (F555W, coloured blue) were combined with images taken in the near-infrared (F814W, coloured red). The total exposure times were 520 s per filter and the field of view is 2.7 arcminutes across. |
Publisher | ESA/Hubble |
Usage terms |
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JPEG file comment | In this NASA/ESA Hubble Space Telescope image of NGC 7479 — created from observations at visible and near-infrared wavelengths — the tightly wound arms of the spiral galaxy create an inverted ‘S’, as they spin in an anticlockwise direction. However, at radio wavelengths, this galaxy, sometimes nicknamed the Propeller Galaxy, spins the other way, with a jet of radiation that bends in the opposite direction to the stars and dust in the arms of the galaxy. Astronomers think that the radio jet in NGC 7479 was put into its bizarre backwards spin following a merger with another galaxy. Star formation is reignited by galactic collisions, and indeed NGC 7479 is undergoing starburst activity, with many bright, young stars visible in the spiral arms and disc. The three brightest stars in this image, however, are foreground stars — caught on camera because they lie between the galaxy and Hubble. This striking galaxy is easily visible in moderate telescopes as an elongated fuzzy patch of light. The spiral arms can be seen with more difficulty in larger telescopes under dark conditions. This picture was created from images taken with the Wide Field Channel of Hubble’s Advanced Camera for Surveys. Images through a yellow filter (F555W, coloured blue) were combined with images taken in the near-infrared (F814W, coloured red). The total exposure times were 520 s per filter and the field of view is 2.7 arcminutes across. |
Orientation | Normal |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop CS5 Windows |
File change date and time | 14:45, 30 March 2011 |
Y and C positioning | Centered |
Exif version | 2.31 |
Date and time of digitizing | 10:56, 18 March 2011 |
Meaning of each component |
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Supported Flashpix version | 1 |
Color space | Uncalibrated |
IIM version | 4 |
Keywords | NGC 7479 |
Bits per component |
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Height | 3,261 px |
Width | 3,182 px |
Pixel composition | RGB |
Number of components | 3 |
Contact information |
http://www.spacetelescope.org/ Karl-Schwarzschild-Strasse 2 Garching bei München, , D-85748 Germany |
Type of media | Observation |
Date metadata was last modified | 16:45, 30 March 2011 |
Unique ID of original document | uuid:0F73D1531F51E011816CBC30D7FF02E5 |
Copyright status | Copyright status not set |