Stunning APEX Survey Reveals Our Mesmerizing Milky Way
NASA/JPL-Caltech/K. Su (Univ. of Arizona)
NASA's Spitzer Space Telescope was launched 10 years ago and has since peeled back an infrared veil on the Cosmos. The mission has worked in parallel with NASA's other "Great Observatories" (Hubble and Chandra) to provide coverage of the emissions from galaxies, interstellar dust, comet tails and the solar system's planets. But some of the most striking imagery to come from the orbiting telescope has been that of nebulae. Supernova remnants, star-forming regions and planetary nebulae are some of the most iconic objects to be spotted by Spitzer. So, to celebrate a decade in space, here are Discovery News' favorite Spitzer nebulae.
First up, the Helix Nebula -- a so-called planetary nebula -- located around 700 light-years from Earth. A planetary nebula is the remnants of the death throes of a red giant star -- all that remains is a white dwarf star in the core, clouded by cometary dust.
NASA/JPL-Caltech/B. Williams (NCSU)
Spitzer will often work in tandem with other space telescopes to image a broad spectrum of light from celestial objects. Here, the supernova remnant RCW 86 is imaged by NASA's Spitzer, WISE and Chandra, and ESA's XMM-Newton.
Staring deep into the Messier 78 star-forming nebula, Spitzer sees the infrared glow of baby stars blasting cavities into the cool nebulous gas and dust.
The green-glowing infrared ring of the nebula RCW 120 is caused by tiny dust grains called polycyclic aromatic hydrocarbons -- the bubble is being shaped by the powerful stellar winds emanating from the central massive O-type star.
NASA/JPL-Caltech/J. Stauffer (SSC/Caltech)
Spitzer stares deep into the Orion nebula, imaging the infrared light generated by a star factory.
X-Ray: NASA/CXC/J.Hester (ASU); Optical: NASA/ESA/J.Hester & A.Loll (ASU); Infrared: NASA/JPL-Caltech/R.Gehrz (Univ. Minn.)
In the year 1054 A.D. a star exploded as a supernova. Today, Spitzer was helped by NASA's other "Great Observatories" (Hubble and Chandra) to image the nebula that remains. The Crab Nebula is the result; a vast cloud of gas and dust with a spinning pulsar in the center.
The Tycho supernova remnant as imaged by Spitzer (in infrared wavelengths) and Chandra (X-rays). The supernova's powerful shockwave is visible as the outer blue shell, emitting X-rays.
NASA/JPL-Caltech/E. Churchwell (University of Wisconsin - Madison)
Over 2,200 baby stars can be seen inside the bustling star-forming region RCW 49.
X-ray: NASA/CXC/Univ.Potsdam/L.Oskinova et al; Optical: NASA/STScI; Infrared: NASA/JPL-Caltech
The "Wing" of the Small Magellanic Cloud (SMC) glitters with stars and warm clouds of dust and gas. By combining observations by Spitzer, Chandra and Hubble, the complex nature of this nebulous region can be realized.
They say a picture is worth a thousand words, but this picture is worth tens of billions of stars.
And that’s what we are seeing here; this is the plane of our galaxy, seen through the eyes of a powerful telescope called the Atacama Pathfinder EXperiment telescope (APEX), located high on the Chajnantor Plateau in Chile’s Atacama region and managed by the European Southern Observatory (ESO).
The mosaic of images represents the completion of the APEX Telescope Large Area Survey of the Galaxy (ATLASGAL) project that imaged the entirety of the Milky Way’s plane seen edge-on from APEX’s Southern Hemisphere location. It is the first galactic survey in sub-millimeter wavelengths — a region of the electromagnetic spectrum between infrared and radio waves — and because of the telescope’s awesome 12-meter wide aperture, astronomers can reveal far more detail in these observations than even space-based telescopes.
Sub-millimeter wavelengths are important to astronomers as they are generated by gas and dust only a few tens of degrees above absolute zero. Seeing our galaxy in these wavelengths can help us better understand the distribution of interstellar gas clouds that ultimately provide fuel for baby stars.
“ATLASGAL provides exciting insights into where the next generation of high-mass stars and clusters form,” said Timea Csengeri from the Max Planck Institute for Radio Astronomy (MPIfR), Bonn, Germany, in an ESO news release. “By combining these with observations from Planck, we can now obtain a link to the large-scale structures of giant molecular clouds.”