• Black hole's mystery 'wave' surprises scientists

    Gabriel Perez Diaz, Instituto de Astrofisica de Canarias (Servicio MultiMedia)

    This image is a simulation of the X-ray binary system Swift J1357.2-0933, a black hole and star system, in which the effect of a strange, vertical mystery structure are at their maximum.

    By Nola Taylor Redd, SPACE.com

    Astronomers studying an unusual black hole system have spotted a never-before-seen structure in the disk of matter encircling the system.

    Swift J1357.2, an X-ray binary system that regularly emits outbursts of high energy, consists of a black hole slowly consuming its companion star. Matter from the doomed star falls into the accretion disk, which surrounds the black hole, feeding it dust and gas.

    While observing the system, a team of scientists noticed an unusual vertical feature traveling through the material.

    "It's the first time we can resolve such [a] structure in an accretion disk, and it might be ubiquitous in X-ray binaries during the outburst state," Jesus Corral-Santana, of the Astrophysical Institute of the Canary Islands in Spain, told SPACE.com by email. [The Strangest Black Holes in the Universe]

    A hidden structure
    The black hole contained in Swift J1357.2 is one of the millions of stellar black holes that dot the Milky Way galaxy.

    About three times as massive as the sun, the behemoth likely formed when a single star collapsed inward on itself. The resulting, city-sized body packed a great deal of mass into a tiny package, creating a strong gravitational pull on nearby dust and gas.

    Located in the Virgo constellation, approximately 4,900 light-years from Earth, Swift J1357.2 also contains a small companion star, which has only a quarter the mass of the sun. This companion star orbits the pair's center of mass every 2.8 hours, one of the shortest known orbital periods for such systems.

    The black hole pulls material from the companion star into its accretion disk, occasionally emitting the X-ray bursts that enabled scientists to find this otherwise hard-to-spot system, researchers said.

    Corral-Santana and his team took hundreds of optical images of the system using the Isaac Newton and the William Herschel Telescopes, both of which are in the Canary Islands. Studying the light produced by the accretion disk, the researchers noticed a periodic dimming in the system, sometimes occurring over the course of only a few seconds.

    "Since the orbital period of the system is 2.8 hours, those dips cannot be produced by eclipses of the companion star. They are much faster," Corral-Santana said. "Therefore, they must be produced by a hidden structure placed very close to the black hole, in the inner accretion disk."

    The new find can only been seen in the outer, optical portion of the accretion disk, not on the inside, where X-ray bursts originate. The X-ray emission, which shows no periodic variation, unlike its optical counterpart, indicated a vertical structure was hiding the black hole, Corral-Santana said.

    Rather than appearing at a set, predictable time, the structure shows up over a steadily increasing period, indicating a wave-like movement through the accretion disk.

    "It is a wave produced in the accretion disk, moving outward," Corral-Santana said, "like the wave produced when a stone is dropped in calm water."

    The missing population
    The wave-like feature also provides information about the orientation of the black hole.

    Objects in space face Earth at a variety of angles, or inclinations. They can be seen edge-on, face-on or somewhere in between. Swift J1357.2 is the only one of 50 suspected similar black-hole systems found with an edge-on accretion disk — what scientists call a high inclination. However, astronomers think approximately 20 percent of these systems should provide such a perspective.

    In order to see the wave-like structure in the accretion disk, scientists must have such an edge-on view of the disk, or one close to it. A view from a lower inclination, closer to face-on, would not reveal the sudden rises and falls in the total light coming from the system.

    "Swift J1357.2 is the prototype of the hitherto missing population of high-inclination black holes in transient X-ray binaries," Corral-Santana said.

    Because Swift J1357.2 is the first such system to allow such an edge-on view, the presence of the vertical structure takes on an added significance. No signs of such structures appear in other similar systems, but that could result simply from their unfortunate angles. Such structures could in fact exist in other, previously discovered transient X-ray binary systems, hidden only by their observational angles.

    The findings were published online Feb. 28 in the journal Science.

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  • Scientists read a galaxy's entrails

    ESO

    The galaxy Centaurus A (NGC 5128) is pictured in this image, taken with by the Wide Field Imager attached to the MPG/ESO 2.2-meter telescope at the European Southern Observatory's La Silla Observatory in Chile. With a total exposure time of more than 50 hours, this could be deepest view of Centaurus A ever created.

    By Alan Boyle, Science Editor, NBC News




    Astronomers are taking a long, deep look at one of the best-known galaxies beyond our own Milky Way, to learn more about what happened when it gobbled up another agglomeration of stars that got too close.

    The entrails of the gobbled galaxy are prominent in this view of Centaurus A, a galaxy about 12 million light-years away in the constellation Centaurus. The bright haze of stars is the typical signature of an elliptical galaxy, but the dark, swirling band of dust around the center is a tip-off that the "A" in Centaurus A stands for "atypical."

    Scientists believe the band represents the dusty leftovers of the galaxy that has been consumed in a gravitationally driven merger. Flashes of fresh hot stars can be seen along the edges of the band. It's thought that an energetic black hole, 100 million times as massive as our sun, is blasting out strong radio emissions from the center of the haze.

    Much of this has been seen before, in previous images of Centaurus A. But today's image, captured by the Wide Field Imager on the European Southern Observatory's MPG/ESO 2.2-meter telescope in Chile, reveals extra details. That's because the camera exposure lasted for more than 50 hours, making this one of the deepest views of Centaurus A ever produced.

    One reddish filament of material is visible above the left edge of the dark band. A fainter filament can be made out near the upper left corner of the picture. These filaments, hotbeds for infant stars, appear to line up with radio-emitting jets that are being spewed out from the central black hole. Such features can help astronomers reconstruct how Centaurus A gobbled a galaxy in the first place, and how the remains are being digested. Further studies, involving ESO's ALMA Observatory, will shed additional light on the scene.

    A video from the European Southern Observatory zooms in on telescope views of Centaurus A, a giant cannibal galaxy.

    More about the gobbling galaxy:

    Alan Boyle is msnbc.com's science editor. Connect with the Cosmic Log community by "liking" the log's Facebook page, following @b0yle on Twitter and adding the Cosmic Log page to your Google+ presence. You can also check out "The Case for Pluto," my book about the controversial dwarf planet and the search for new worlds.