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Hubble's View Of Barred Spiral Galaxy Ngc 1672

NASA,

DESCRIZIONE

*Description*: This NASA Hubble Space Telescope view of the nearby barred spiral galaxy NGC 1672 unveils details in the galaxy's star-forming clouds and dark bands of interstellar dust. One of the most striking features is the dust lanes that extend away from the nucleus and follow the inner edges of the galaxy's spiral arms. Clusters of hot young blue stars form along the spiral arms and ionize surrounding clouds of hydrogen gas that glow red. Delicate curtains of dust partially obscure and redden the light of the stars behind them by scattering blue light. Galaxies lying behind NGC 1672 give the illusion they are embedded in the foreground galaxy, even though they are really much farther away. They also appear reddened as they shine through NGC 1672's dust. A few bright foreground stars inside our own Milky Way Galaxy appear in the image as bright and diamond-like objects. As a prototypical barred spiral galaxy, NGC 1672 differs from normal spiral galaxies, in that the arms do not twist all the way into the center. Instead, they are attached to the two ends of a straight bar of stars enclosing the nucleus. Viewed nearly face on, NGC 1672 shows intense star formation regions especially off in the ends of its central bar. Astronomers believe that barred spirals have a unique mechanism that channels gas from the disk inward towards the nucleus. This allows the bar portion of the galaxy to serve as an area of new star generation. NGC 1672 is also classified as a Seyfert galaxy. Seyferts are a subset of galaxies with active nuclei. The energy output of these nuclei can sometimes outshine their host galaxies. This activity is powered by accretion onto supermassive black holes. NGC 1672 is more than 60 million light-years away in the direction of the southern constellation Dorado. These observations of NGC 1672 were taken with Hubble's Advanced Camera for Surveys in August of 2005. The composite image was made by using filters that isolate light from the blue, green, and infrared portions of the spectrum, as well as emission from ionized hydrogen. For more information, contact: Ray Villard Space Telescope Science Institute, Baltimore, Md. (Phone: 410-338-4514; E-mail: villard@stsci.edu) Lars Lindberg Christensen Hubble/ESA, Garching, Germany (Phone: 49-89-3200-6306; Cell phone: 49-173-3872-621; E-mail: lars@eso.org) Technical facts about this news release: About the Object Object Name: NGC 1672 Object Description: Barred Spiral Galaxy Position (J2000): R.A. 04h 45m 42s.10 Dec. -59° 14' 56" Constellation: Dorado Distance: Approximately 60 million light-years (18 megaparsecs) away. Dimensions: This image is 4.4 arcminutes (75,000 light-years or 23 kiloparsecs) wide. About the Data Data Description: The Hubble image was created from HST data from proposal 10354: L. Jenkins (University of Leicester), M. Ward and T. Roberts (University of Durham), A. Levan (University of Hertfordshire), and A. Zezas (Harvard- Smithsonian Center for Astrophysics). Instrument: ACS/WFC Exposure Date(s): August 1, 2005 Exposure Time: 2.7 hours Filters: F435W ("B"), F550M (y), F658N (Halpha+[N II]), and F814W ("I") About the Image Image Credit: NASA, ESA, and the Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration Release Date: April 3, 2007 Color This image is a composite of many separate exposures made by the ACS instrument on the Hubble Space Telescope using several different filters. Three filters were used to sample broad wavelength ranges. One filter was used to sample narrow wavelength emission. The color results from assigning different hues (colors) to each monochromatic image. In this case, the assigned colors are: F435W ("B") blue F550M (y) green F658N (Halpha+[N II]) and F814W ("I") red Orientation: Hubble's View of Barred Spiral Galaxy NGC 1672 [ http://imgsrc.hubblesite.org/hu/db/2007/15/images/a/formats/compass_large_web.jpg ] What is Hubble Heritage? A monthly showcase of new and archival Hubble images. Go to the Heritage site. This NASA Hubble Space Telescope view of the nearby barred spiral galaxy NGC 1672 unveils details in the galaxy?s star-forming clouds and dark bands of interstellar dust. NGC 1672 is more than 60 million light-years away in the direction of the southern constellation Dorado. These observations of NGC 1672 were taken with Hubble's Advanced Camera for Surveys in August of 2005. *News Release Number:*: STScI-2007-15a

DETTAGLI

LICENZA : Pubblico dominio
ARGOMENTI : # in Matematica e scienze / Astronomia
TAG : tag: NGC 1672 , Hubble Space Telescope (HST) , Constellation , Dorado , Advanced Camera for Surveys , NGC 1672 , Milky Way Galaxy , Germany
FONTE : Hubble Space Telescope Collection