Sentences with phrase «dwarf satellites in»
Its discovery suggests the presence of a large number of yet - undetected dwarf satellites in the halo of the Milky Way and provides important insights into galaxy formation through hierarchical assembly of dark matter.
https://www.sciencedaily.com/ Not exact matches
An international team of astronomers has determined that Centaurus A, a massive elliptical galaxy 13 million light - years from Earth, is accompanied by a number of dwarf satellite galaxies orbiting the main body in a narrow disk.
Yet Centaurus A is the third documented example, behind the Milky Way and Andromeda, of a «vast polar structure» in which satellite dwarves co-rotate around a central galactic mass in what Pawlowski calls «preferentially oriented alignment.»
The rarity of these events — only 15 meaningful ones, seen in the direction of our satellite galaxies, have been recorded — confirmed that brown dwarfs and black holes are far too scarce to make up a significant fraction of the dark portion of our galaxy.
Researchers from the Niels Bohr Institute, among others, have detected a stream of stars in one of the Andromeda Galaxy's outer satellite galaxies, a dwarf galaxy called Andromeda II.
«Just this year, more than 20 of these dwarf satellite galaxy candidates have been spotted, with 17 of those found in Dark Energy Survey data,» said Alex Drlica - Wagner of the U.S. Department of Energy's (DOE) Fermi National Accelerator Laboratory, one of the leaders of the DES analysis.
The 17 dwarf satellite galaxy candidates were discovered in the first two years of data collected by the Dark Energy Survey, a five - year effort to photograph a portion of the southern sky in unprecedented detail.
«Scientists find rare dwarf satellite galaxy candidates in dark energy survey data.»
But Michael Skrutskie, a University of Virginia astronomer and a member of the WISE science team, is especially interested in the satellite's ability to pick out previously unknown brown dwarfs, objects larger than planets but too small to sustain nuclear fusion of hydrogen.
«This discovery implies hundreds of faint dwarf satellites waiting to be discovered in the halo of the Milky Way,» he said.
The faintest dwarf satellites identified so far was Segue I, discovered by SDSS -LRB--1.5 mag) and Cetus II in DES (0.0 mag).
Stuart Clark describes how a superfluid Bose - Einstein state of dark matter particles might explain the streams of dwarf satellite galaxies in polar orbit around the Milky Way and Andromeda galaxies (2 April, p 30).
David Merritt, professor of astrophysics at Rochester Institute of Technology, co-authored «Co-orbiting satellite galaxy structures are still in conflict with the distribution of primordial dwarf galaxies,» to be published in an upcoming issue of Monthly Notices of the Royal Astronomical Society.
The New Horizons spacecraft finally spied the dwarf planet's two tiniest satellites, Kerberos and Styx, in a series of images taken from April 25 to May 1, when the probe was nearly 90 million kilometers from Pluto.
The image sequence below starting from from top left and moving clockwise: Messier 32 (E2 satellite of Andromeda Galaxy), Messier 87 (a huge elliptical at the center of the Virgo cluster), Leo I (= UGC 5470, E3 dwarf elliptical in Local Group), Messier 110 (another satellite of Andromeda Galaxy, E6 type)
The discovery of numerous faint dwarf galaxies in Fornax suggests that the «missing satellites» are now being found.
These satellite galaxies are classed as dwarfs, since they contain only a small fraction of the stars hosted in regular galaxies.
«For the first time, we've been able to determine how individual stars are moving through a dwarf satellite of our Milky Way,» says Davide Massari from Kapteyn Astronomical Institute in Groningen, The Netherlands, who is lead author of the paper published today in Nature Astronomy.
Measuring in at around half the size of Makemake, RR245 is much smaller than other known dwarf planets in the neighborhood, but still meets the International Astronomical Union's (IAU) criteria of that category: namely, it's in orbit around the Sun, it has sufficient mass for its self - gravity to overcome rigid body forces so that it assumes a nearly round shape, and, unlike regular planets, it hasn't cleared the neighbourhood around its orbit, and it isn't a satellite.
Meanwhile, protoplanets that have avoided collisions may become natural satellites of planets through a process of gravitational capture, or remain in belts of other objects to become either dwarf planets or small solar system bodies.
The July 14 close encounter — in which New Horizons will zoom within 7,800 miles (12,500 kilometers) of Pluto — will reveal many different surface features, such as craters and mountains, on the dwarf planet and its satellites (Charon, Nix, Hydra, Kerberos and Styx).
The new satellites were found in the southern hemisphere near the Large and Small Magellanic Cloud, the largest and most well - known dwarf galaxies in the Milky Way's orbit.
The only other extragalactic globular listed in the Messier Catalogue, Messier 54, is believed to belong to the Sagittarius Dwarf Elliptical Galaxy, a satellite galaxy of the Milky Way.