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A Galaxy Revealed in Multiple Wavelengths

A Galaxy Revealed in Multiple Wavelengths. Topic: Multiwavelength observations Concepts: Infrared observations, X-ray observations, Optical observations, EM spectrum Missions: “Great Observatories”: Hubble, Chandra, Spitzer; GALEX Coordinated by the NASA Astrophysics Forum.

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A Galaxy Revealed in Multiple Wavelengths

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  1. A Galaxy Revealed in Multiple Wavelengths Topic: Multiwavelength observations Concepts: Infrared observations, X-ray observations, Optical observations, EM spectrum Missions: “Great Observatories”: Hubble, Chandra, Spitzer; GALEX Coordinated by the NASA Astrophysics Forum An Instructor’s Guide for using the slide sets is available at the ASP website http://www.astrosociety.org/education/astronomy-resource-guides/

  2. The Four Space Observatories Provide New Insights into M101 • In 2012, GALEX ultraviolet observations added new insights into the structure of the Pinwheel Galaxy, M101. • Combined with previous Spitzer, Hubble, and Chandra observations, they produced a new multiwavelength view of the galaxy M101 combining infrared, visible, ultraviolet, and X-ray images, respectively, into a single picture. Messier 101 (M101) is a face-on spiral galaxy 22 million light years distant in the direction of the constellation Ursa Major and is 70% larger than our own Milky Way. Credit:NASA/CXC/SAO, NASA/JPL-Caltech, NASA/STScI

  3. How do Astronomers Learn More about M101? Investigations across multiple wavelengths provides a more complete view of galaxies like M101: • Spitzer’s infrared view can show lanes of dust that congeal into stars—the brightest areas warmed by young, hot stars. • Hubble’s visible light view can reveal a galaxy’s stars and star clusters, and brownish dust lanes silhouetted against their glow. • GALEX’s ultraviolet view can locate hot, young stars that formed about 1 million years ago. • Chandra’s x-ray view can unveil the emission from supernova remnants, diffuse hot gas, and where gas spiraling into black holes is heated to extremes.

  4. The Big Picture Spitzer Image: Large MagellanicCloud • Galaxies are made of various objects that emit in different wavelengths: • Types of stars: young and old, big and small • Diffuse gas • Interstellar dust • Exotic, high-energetic objects (e.g. black holes or neutron stars) • A complete understanding of how galaxies form and evolve with time, requires understanding all of these components • Some of them must be studied at different wavelengths. Hubble Image: M51 These three galaxies have been studied extensively in various wavelengths to help astronomers better understand their evolutions. Chandra Image: Centaurus A

  5. How Does this Change our View? • Adding the GALEX UV view of M101reveals the true extent of the galaxy and shows us how many young, hot stars have recently formed in the outskirts of the galaxy’s disk! • Images taken in different wavelengths reveal different aspects and processes of galaxies like M101 and of the universe at large, allowing us to build a complete picture and understanding of the cosmos. • NASA’s science missions range across the electromagnetic spectrum to reveal this larger, deeper, and more fundamental view. Composite Ultraviolet Infrared X-ray Visible Animated slide: click through to compare the images. Credit:NASA/CXC/SAO, NASA/JPL-Caltech, NASA/STScI

  6. Resources • Press release: • http://chandra.harvard.edu/photo/2012/m101/ • Activities: • Hubble’s Composite Images • http://amazing-space.stsci.edu/resources/print/lithos/n90_nebula_litho.pdf • Multimedia: • Video – combining the Hubble, Chandra, and Spitzer observations: http://hubblesite.org/newscenter/archive/releases/2009/07/video/b/ • EM spectrum tour: • http://missionscience.nasa.gov/ems/index.html

  7. A Galaxy Revealed in Multiple Wavelengths BONUS CONTENT

  8. NASA leverages the EM Spectrum Credit: Goddard Space Flight Center • NASA has a fleet of telescopes that cover the electromagnetic (EM) spectrum, in order to observe the universe in different wavelengths. • Because Earth’s atmosphere blocks certain wavelengths of light, space-based (and stratospheric) observatories often complement the work of ground-based observatories.

  9. What do the Colors Mean? GALEX Spitzer Hubble Chandra Infrared Ultraviolet X-ray Visible • Because human eyes cannot see in Infrared, Ultraviolet or X-ray, scientists assigned red, yellow, blue, and purple colors to Spitzer, Hubble, GALEX, and Chandra images, respectively. • Combining the four colors produces the final multiwavelength imagethat traces various astrophysical processes occurring in the M101 galaxy.

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