An international group of astronomers, including Marita Krause and Rainer Beck from Max-Planck-Institut für Radioastronomie (MPIfR) in Bonn, has found a surprising and useful new probe of galactic magnetic fields. While studying gas halos around nearby galaxies, they were surprised when detailed studies with the Karl G. Jansky Very Large Array (VLA) showed that one of their subjects is not a single galaxy, but rather two, nearly perfectly superimposed on the sky to masquerade as one. The discovery allowed them to use the alignment to learn otherwise-unobtainable facts about the nearer galaxy.
The edge-on spiral galaxy UGC 10288 (horizontal) appeared to be a single object in previous radio telescope observations. However, new, detailed radio data (cyan in this image) from the NRAO's VLA reveals that the large perpendicular (vertical) extension really is a distant background galaxy with radio jets. The foreground image of UGC 10288 includes data from optical, infrared and radio telescopes. While radio data are blue, infrared observations from NASA's Spitzer Space Telescope and Wide-field Infrared Survey Explorer (WISE) are yellow and orange, respectively. Optical data from the Sloan Digital Sky Survey are purplish blue and show starlight; and optical data from the Kitt Peak National Observatory are rose and show heated gas.
© Jayanne English (University of Manitoba, Kanada), Judith Irwin (Queen's University, Kanada), Richard Rand, University of New Mexico, Albuquerque, and members of CHANG-ES consortium, NRAO VLA, NASA/JPL-Caltech WISE & Spitzer, NOAO, and SDSS.
This image of UGC 10288, the foreground spiral galaxy, includes data from NASA's WISE (far-infrared; orange) and Spitzer (near-infrared; yellow) space observatories, the Kitt Peak National Observatory's 0.9m telescope (ionized hydrogen; rose), and the Sloan Digital Sky Survey (optical; purplish-blue), and NRAO's VLA (radio; cyan).
© see Fig. 1
As part of a study of 35 galaxies, the astronomers observed one called UGC 10288, a spiral galaxy more than 100 million light-years distant that appears edge-on as seen from Earth. Their multiple VLA observations in 2011 and 2012 produced the best radio-telescope images of that galaxy ever made. The detailed images surprisingly revealed a more-distant galaxy, with strong radio emission, almost directly behind UGC 10288. In previous images, the two galaxies had been blended together. It is probably the first detection of an alignment of a foreground galaxy with such a strongly- emitting background galaxy with extended jets. The background galaxy is much further away, in a distance of nearly 7 billion light-years from Earth.
"This changed the picture, quite literally," says Judith Irwin, of Queen's University in Ontario, Canada. "It changed our understanding of the characteristics of UGC 10288, but also gave us an unexpected new tool for learning more about that galaxy."
The first insight gleaned from the improved images was that UGC 10288 is not forming stars as rapidly as the astronomers first thought. This is because much of the radio emission in the previous, blended images came from the background galaxy.
The new images also showed that the gas in the galaxy's "outskirts," high above its spiral disk does not form a smooth halo-like envelope as result of an extremely low star formation rate.
The background galaxy, and the fact that it is aligned with its radio jets perpendicular to UGC 10288's disk, provides a valuable means of studying the nearer galaxy. "We can use the radio waves from the background galaxy, coming through the nearer one, as a way to measure the properties of the nearer galaxy," says Jayanne English, of the University of Manitoba.
“The use of the more distant galaxy as a background candle has given us the opportunity of magnetic-field measurements in different areas of UGC 10288,” explains Marita Krause from the Max-Planck-Institut für Radioastronomie in Bonn, Germany. “Since the background galaxy is vertically orientated, we can study the magnetic field of the foreground galaxy from the disk up to regions high above.”
The researchers could measure the magnetic field via the effect of Faraday rotation which rotates the polarization plane of the radio emission of the background galaxy within the foreground galaxy.
"Ironically, the radio brightness of UGC 10288 alone is too weak to be included in the original sample, had it not been boosted by the unresolved background galaxy in earlier images," concludes Rainer Beck, also from Max-Planck-Institut für Radioastronomie. “We would have missed an excellent opportunity for magnetic field studies via extended background sources.”
Marita Krause and Rainer Beck, both from Max-Planck-Institut für Radioastronomie (MPIfR), Bonn, Germany, worked with an international team of astronomers from North America, Europe, and India who are part of the Continuum Halos in Nearby Galaxies - an EVLA Survey (CHANG-ES) consortium, led by Judith Irwin. The scientists report their findings in the December issue of the Astronomical Journal.
The National Radio Astronomy Observatory (NRAO) is a facility of the National Science Foundation, operated under cooperative agreement by Associated Universities, Inc.
ContactDr. Marita Krause
Judith Irwin, Marita Krause, Jayanne English, Rainer Beck, Eric Murphy, Theresa Wiegert, George Heald, Rene Walterbos, Richard J. Rand, and Troy Porter, 2013, Astronomical Journal 146, 164 (eprint arXiv:1311.3894)
Dr. Norbert Junkes | Max-Planck-Institut
What happens when we heat the atomic lattice of a magnet all of a sudden?
18.07.2018 | Forschungsverbund Berlin
Subaru Telescope helps pinpoint origin of ultra-high energy neutrino
16.07.2018 | National Institutes of Natural Sciences
For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.
To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...
For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.
Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...
Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.
A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...
Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.
"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....
Ultra-short, high-intensity X-ray flashes open the door to the foundations of chemical reactions. Free-electron lasers generate these kinds of pulses, but there is a catch: the pulses vary in duration and energy. An international research team has now presented a solution: Using a ring of 16 detectors and a circularly polarized laser beam, they can determine both factors with attosecond accuracy.
Free-electron lasers (FELs) generate extremely short and intense X-ray flashes. Researchers can use these flashes to resolve structures with diameters on the...
13.07.2018 | Event News
12.07.2018 | Event News
03.07.2018 | Event News
18.07.2018 | Life Sciences
18.07.2018 | Materials Sciences
18.07.2018 | Health and Medicine