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Maffei 2
(Preview)
Maffei 2 is an intermediate spiral galaxy about 10 million light-years away in the constellation Cassiopeia. Maffei 2 and Maffei 1 were both discovered by Paolo Maffei in 1968 from their infrared emission. Maffei 2 lies in the Zone of Avoidance and is heavily obscured by the Milky Way, so is barely de...
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Object X
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What makes the luminous star known as Object X look so dim? One might think that it would be hard to hide a star some 500,000 times more radiant than the sun, but distance and dust seem to have conspired to do just that. A group of astronomers has identified such a star in the Triangulum Galaxy, a neighbour...
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Abell 523
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Title: A giant radio halo in the low luminosity X-ray cluster Abell 523 Authors: G. Giovannini, L. Feretti, M. Girardi, F. Govoni, M. Murgia, V. Vacca, J. Bagchi Radio halos are extended and diffuse non-thermal radio sources present at the cluster center, not obviously associated with any individ...
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Supernova 2002bj
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Supernova 2002bj in NGC 1821 A new type of supernova - the explosive death of a star has been discovered in which helium detonates on the surface of a white dwarf star. The exploding star, dubbed SN2002bj, was first observed seven years ago in the galaxy NGC 1821 by amateur astronomers, but was miscla...
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Q 01323-4037
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Title: When two become one: an apparent QSO pair turns out to be a single quasar Authors: Guido Cupani, Stefano Cristiani, Valentina D'Odorico, Bo Milvang-Jensen, Jens-Kristian Krogager We report on our serendipitous discovery that the objects Q 01323-4037 and Q 0132-4037, listed in the Veron-...
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blackhole spectra
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Spectra obtained using the Chandra x-ray telescope show more than 300 supermassive black holes in the centres of galaxies.
A team of astronomers has been able to determine the amount of iron near the black holes. The black holes were all located in the North and South Chandra Deep Fields (locat...
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Abell 3827
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Title: Strong Gravitational Lensing by the Super-massive cD Galaxy in Abell 3827 Authors: E. R. Carrasco, P. L. Gomez, T. Verdugo, H. Lee, R. Diaz, M. Bergmann, J. E. H. Turner, B. W. Miller, M. J. West We have discovered strong gravitational lensing features in the core of the nearby cluster Abell 38...
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CASTLE survey
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Title: Resolving the baryon-fraction profile in lensing galaxies Authors: Dominik Leier, Ignacio Ferreras, Prasenjit Saha, Emilio E. Falco We present a study of the radial dependence of stellar mass or baryon fraction for 21 lensing galaxies from the CfA-Arizona Space Telescope LEns (CASTLE)...
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Submillimetre-bright Galaxies
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Title: Spitzer IRAC Infrared Colours of Submillimetre-bright Galaxies Authors: Min S. Yun, I. Aretxaga, M. L. N. Ashby, J. Austermann, G. G. Fazio, M. Giavalisco, J.-S. Huang, D. H. Hughes, S. Kim, J. D. Lowenthal, T. Perera, K. Scott, G. W. Wilson, J. D. Younger High-redshift submillimetre-brig...
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Lemaitre-Tolman-Bondi (LTB) metric
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Title: Looking the void in the eyes - the kSZ effect in LTB models Authors: Juan Garcia-Bellido, Troels Haugboelle As an alternative explanation of the dimming of distant supernovae it has recently been advocated that we live in a special place in the Universe near the centre of a large void describe...
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XMMU J1007.4+1237
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Title: The X-ray luminous galaxy cluster XMMU J1007.4+1237 at z=1.56 - The dawn of starburst activity in cluster cores Authors: Rene Fassbender, Alessandro Nastasi, Hans Böhringer, Robert Suhada, Joana S. Santos, Piero Rosati, Daniele Pierini, Martin Mühlegger, Hernan Quintana, Axel D. Schw...
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COSMOS-AzTEC3
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NASA Telescopes Help Identify Most Distant Galaxy Cluster Astronomers have uncovered a burgeoning galactic metropolis, the most distant known in the early universe. This ancient collection of galaxies presumably grew into a modern galaxy cluster similar to the massive ones seen today. The dev...
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SPT-CL J2106-5844
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Title: Discovery and Cosmological Implications of SPT-CL J2106-5844, the Most Massive Known Cluster at z > 1 Authors: R. J. Foley, K. Andersson, G. Bazin, T. de Haan, J. Ruel, P. A. R. Ade, K. A. Aird, R. Armstrong, M. L. N. Ashby, M. Bautz, B. A. Benson, L. E. Bleem, M. Bonamente, M. Brodwin, J. E. Car...
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Supernova 2007bi
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Massive supernova produced rainbow of elements for months. Astronomers have watched the violent death of what was probably the most massive star ever detected. The supernova explosion, which lasted for months, is thought to have generated more than 50 Suns' worth (10^32 kilograms) of different...
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Intergalactic magnetic fields
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Title: Evidence for Gamma-Ray Halos Around Active Galactic Nuclei and the First Measurement of Intergalactic Magnetic Fields Authors: Shin'ichiro Ando (Caltech), Alexander Kusenko (UCLA/Tokyo) (Version v2) Intergalactic magnetic fields (IGMF) can cause the appearance of halos around the...
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