Hubble's High-Definition Panoramic View of the Andromeda Galaxy

Article ID: 627924

Released: 5-Jan-2015 4:00 PM EST

Source Newsroom: Space Telescope Science Institute (STScI)

  • Credit: NASA, ESA, J. Dalcanton, B.F. Williams, and L.C. Johnson (Univ. of Washington), the PHAT team, and R. Gendler

    The largest NASA Hubble Space Telescope image ever assembled, this sweeping bird's-eye view of a portion of the Andromeda galaxy (M31) is the sharpest large composite image ever taken of our galactic next-door neighbor. Though the galaxy is over 2 million light-years away, the Hubble telescope is powerful enough to resolve individual stars in a 61,000-light-year-long stretch of the galaxy's pancake-shaped disk. It's like photographing a beach and resolving individual grains of sand. And, there are lots of stars in this sweeping view -- over 100 million, with some of them in thousands of star clusters seen embedded in the disk. The panorama is the product of the Panchromatic Hubble Andromeda Treasury (PHAT) program. Images were obtained from viewing the galaxy in near-ultraviolet, visible, and near-infrared wavelengths, using the Advanced Camera for Surveys and the Wide Field Camera 3 aboard Hubble. This cropped view shows a 48,000-light-year-long stretch of the galaxy in its natural visible-light color, as photographed with Hubble's Advanced Camera for Surveys in red and blue filters July 2010 through October 2013.

  • Credit: NASA, ESA, J. Dalcanton, B.F. Williams, and L.C. Johnson (Univ. of Washington), the PHAT team, and R. Gendler

    The largest NASA Hubble Space Telescope image ever assembled, this sweeping bird's-eye view of a portion of the Andromeda galaxy (M31) is the sharpest large composite image ever taken of our galactic next-door neighbor. Though the galaxy is over 2 million light-years away, the Hubble telescope is powerful enough to resolve individual stars in the 61,000-light-year-long stretch of the galaxy's pancake-shaped disk seen here. It's like photographing a beach and resolving individual grains of sand. And, Hubble astronomers see lots of stars in this sweeping view -- over 100 million, with some of them in thousands of star clusters seen embedded in the disk. Hubble traces densely packed stars extending from the innermost hub of the galaxy seen at left. Moving out from this central galactic bulge, the panorama sweeps from the galaxy's central bulge across lanes of stars and dust to the sparser outer disk. Large groups of young blue stars indicate the locations of star clusters and star-forming regions. The stars bunch up in the blue ring-like feature toward the right side of the image. The dark silhouettes trace out complex dust structures. Underlying the entire galaxy is a smooth distribution of cooler red stars that trace Andromeda's evolution over billions of years. Because the galaxy is only 2.5 million light-years from Earth, it is a much bigger target in the sky than the myriad galaxies Hubble routinely photographs that are billions of light-years away. This means that the Hubble survey consists of 7,398 exposures taken over 411 individual pointings and assembled together into a mosaic image. The edges of the mosaic form a sawtooth pattern created by stitching together the multiple fields. The panorama is the product of the Panchromatic Hubble Andromeda Treasury (PHAT) program. Images were obtained from viewing the galaxy in near-ultraviolet, visible, and near-infrared wavelengths, using the Advanced Camera for Surveys and the Wide Field Camera 3 aboard Hubble. This view shows the galaxy in its natural visible-light color, as photographed with the Advanced Camera for Surveys in red and blue filters July 2010 through October 2013.

  • Credit: NASA, ESA, and Z. Levay (STScI/AURA); PHAT Mosaic: NASA, ESA, J. Dalcanton, B.F. Williams, and L.C. Johnson (Univ. of Washington), the PHAT team, and R. Gendler; Ground-based Background Image of M31: (c) 2008 R. Gendler, used with permission

    The Hubble Space Telescope M31 PHAT mosaic image is shown in context with a ground-based image of galaxy M31. The background image, taken by Robert Gendler, was made by compositing M31 data from a 12.5-inch Ritchey-Chretien telescope with M31 data from the Digitized Sky Survey.

  • Credit: NASA, ESA, and Z. Levay (STScI/AURA); Science: NASA, ESA, J. Dalcanton, B.F. Williams, and L.C. Johnson (Univ. of Washington), and the PHAT team

    In this detailed image of the Hubble Space Telescope M31 PHAT mosaic image, several object types are labeled, including dust lanes, stellar clusters, Milky Way stars, and star-forming regions. This image is a small section of the full mosaic that includes ultraviolet, visible, and near-infrared observations obtained with the Wide Field Camera 3.

Newswise — The largest NASA Hubble Space Telescope image ever assembled, this sweeping bird's-eye view of a portion of the Andromeda galaxy (M31) is the sharpest large composite image ever taken of our galactic next-door neighbor. Though the galaxy is over 2 million light-years away, the Hubble telescope is powerful enough to resolve individual stars in a 61,000-light-year-long stretch of the galaxy's pancake-shaped disk. It's like photographing a beach and resolving individual grains of sand. And, there are lots of stars in this sweeping view -- over 100 million, with some of them in thousands of star clusters seen embedded in the disk.

This ambitious photographic cartography of the Andromeda galaxy represents a new benchmark for precision studies of large spiral galaxies that dominate the universe's population of over 100 billion galaxies. Never before have astronomers been able to see individual stars inside an external spiral galaxy over such a large contiguous area. Most of the stars in the universe live inside such majestic star cities, and this is the first data that reveal populations of stars in context to their home galaxy. Hubble traces densely packed stars extending from the innermost hub of the galaxy, seen at left. Moving out from this central galactic bulge, the panorama sweeps from the galaxy's central bulge across lanes of stars and dust to the sparser outer disk. Large groups of young blue stars indicate the locations of star clusters and star-forming regions. The stars bunch up in the blue ring-like feature toward the right side of the image. The dark silhouettes trace out complex dust structures. Underlying the entire galaxy is a smooth distribution of cooler red stars that trace Andromeda's evolution over billions of years.

Because the galaxy is only 2.5 million light-years from Earth, it is a much bigger target in the sky than the myriad galaxies Hubble routinely photographs that are billions of light-years away. This means that the Hubble survey is assembled together into a mosaic image using 7,398 exposures taken over 411 individual pointings.

The panorama is the product of the Panchromatic Hubble Andromeda Treasury (PHAT) program. Images were obtained from viewing the galaxy in near-ultraviolet, visible, and near-infrared wavelengths, using the Advanced Camera for Surveys and the Wide Field Camera 3 aboard Hubble. This cropped view shows a 48,000-light-year-long stretch of the galaxy in its natural visible-light color, as photographed with Hubble's Advanced Camera for Surveys in red and blue filters July 2010 through October 2013.

The panorama is being presented at the 225th Meeting of the Astronomical Society in Seattle, Washington.

Credit: NASA, ESA, J. Dalcanton, B.F. Williams, and L.C. Johnson (University of Washington), the PHAT team, and R. Gendler

For images and more information about Hubble, visit:

http://hubblesite.org/news/2015/02

http://www.nasa.gov/hubble

For additional information, contact:

Ray VillardSpace Telescope Science Institute, Baltimore, Md.410-338-4514villard@stsci.edu

Julianne Dalcanton / Ben WilliamsUniversity of Washington, Seattle, Wash.jd@astro.washington.edu / ben@astro.washington.edu

The Hubble Space Telescope is a project of international cooperation between NASA and the European Space Agency. NASA's Goddard Space Flight Center in Greenbelt, Maryland, manages the telescope. The Space Telescope Science Institute (STScI) in Baltimore conducts Hubble science operations. STScI is operated for NASA by the Association of Universities for Research in Astronomy, Inc., in Washington, D.C.


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