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Black Holes
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Most of the biggest black holes in the universe have been eating cosmic meals behind closed doors – until now.
With its sharp infrared eyes, the Spitzer Space Telescope (SST) peered through walls of galactic dust to uncover what may be the long-sought missing population of hungry [url=http://...
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148
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Carbon
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Most of the carbon supporting life on Earth was forged by red giant stars that never exploded, say astronomers in Michigan and Sweden. These stars cast the carbon into space when they blew off their outer atmospheres and became white dwarfs.
Carbon, nitrogen, and oxygen--atomic numbers 6, 7, a...
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19
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Modified Newtonian dynamics (MOND)
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If, for some reason, you managed to make an egg stand on its end during the recent equinox, experimental physicists could do with your help. An exquisitely sensitive experiment that can only be performed during equinoxes could test some of the theories that offer an alternative to dark matter. Star...
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6
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NGC 253
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Frantic activity revealed in dusty stellar factories Thanks to the Very Large Telescope's acute and powerful near-infrared eye, astronomers have uncovered a host of new young, massive and dusty stellar nurseries in nearby galaxy NGC 253. The centre of this galaxy appears to harbour a twin of our o...
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18
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8C 1803+784
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Title: S5 1803+78 revisited Authors: R. Nesci (1), A. Maselli (2), F. Montagni (3) ((1) University La Sapienza, Roma, Italy, (2) INAF-IASF, Palermo, Italy, (3) Greve in Chianti Observatory, Italy) We report on our optical monitoring of the BL Lac object S5 1803+78 from 1996 to 2011. The source show...
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Cosmic star-formation history
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Title: Cosmic star-formation history from a non-parametric inversion of infrared galaxy counts Authors: Damien Le Borgne (1 and 2), David Elbaz (1), Pierre Ocvirk (3), Christophe Pichon (2) ((1) CEA/Saclay, DSM/IRFU/SAp, Gif-sur-Yvette, France, (2) Institut d'Astrophysique de Paris, UMR7...
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5
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Giant magnetar flare
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On November 3rd, 2005, no fewer than six spacecraft detected a powerful burst of gamma rays coming from the constellation Ursa Major in the general direction of the two galaxies M81 and M82. Both galaxies are about 12 million light-years away.
The Swift, HETE-2, RHESSI, Mars Odyssey spacecraf...
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8
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Galactic gas
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Raging storms sweep away galactic gas ESA's Herschel infrared space observatory has detected raging winds of molecular gas streaming away from galaxies. Suspected for years, these outflows may have the power to strip galaxies of gas and halt star formation in its tracks. The winds that Herschel...
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Messier 87
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The astrophysicists of the international H.E.S.S. collaboration report the discovery of fast variability in very-high-energy (VHE) gamma rays from the giant elliptical galaxy M 87. The detection of these gamma-ray photons - with energies more than a million million times the energy of visible...
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38
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Coma Cluster Galaxies
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Title: Chandra X-ray Observations of Galaxies in an Off-Centre Region of the Coma Cluster
Authors: A.E. Hornschemeier, B. Mobasher, D.M. Alexander, F.E. Bauer, M.W. Bautz, D. Hammer, B.M. Poggianti
Researchers have performed a pilot Chandra X-ray telescope survey of an... < 10^-3).
They do not have sufficient numbers of X-ray detected galaxies to directly measure the galaxy X-ray Luminosity Function (XLF). However, since they have a well-measured optical LF, they took this low X-ray to optical flux ratio for the 7 spectroscopically confirmed galaxies to translate the optical LF to an XLF.
They find good agreement with Finoguenov et al. (2004), indicating that the X-ray emission per unit optical flux per galaxy is suppressed in clusters of galaxies, but extends this work to a specific off-centre environment in the Coma cluster. Finally, They report the discovery of a region of diffuse X-ray flux that might correspond to a small group interacting with the Coma Intra-Cluster Medium (ICM).
Read More (PDF)
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14
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NGC1097
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Near-infrared images of the active galaxy NGC 1097, obtained with the NACO adaptive optics instrument on ESO's Very Large Telescope, disclose with unprecedented detail a complex central network of filamentary structure spiralling down to the centre of the galaxy. These observations p...
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Corona Borealis Supercluster
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Title: Does the Corona Borealis Supercluster form a giant binary-like system? Author: Giovanni C. Baiesi Pillastrini The distribution of local gravitational potentials generated by a complete volume-limited sample of galaxy groups and clusters filling the Corona Borealis region has been an...
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Voids
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Title: Alignments of Voids in the Cosmic Web Authors: Erwin Platen, Rien van de Weygaert, Bernard J.T. Jones We investigate the shapes and mutual alignment of voids in the large scale matter distribution of a LCDM cosmology simulation. The voids are identified using the novel WVF void finder techn...
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2
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NGC 6503
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Title: Aperture Synthesis Observations of the Nearby Spiral NGC 6503: Modelling the Thin and Thick HI Disks Authors: Eric W. Greisen, Kristine Spekkens, Gustaaf A. van Moorsel We present sensitive aperture synthesis observations of the nearby, late-type spiral galaxy NGC 6503, and produce HI m...
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Messier 84
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Title: In-depth Chandra study of the AGN feedback in Virgo elliptical galaxy M84 Authors: A. Finoguenov, M. Ruszkowski, C. Jones, M. Brueggen, A. Vikhlinin, E. Mandel Using deep Chandra observations of M84 we study the energetics of the interaction between the black hole and the interstellar med...
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