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HD3651B: the first directly imaged brown dwarf companion of an exoplanet host star
Mazeh, T.; Neuhäuser, R.; Mugrauer, M. +1 more
In the course of our ongoing multiplicity study of exoplanet host stars we detected a faint companion located at ~43arcsec (480au physical projected separation) north-west of its primary - the exoplanet host star HD3651 at 11pc. The companion, HD3651B, clearly shares the proper motion of the exoplanet host star in our four images, obtained with th…
A combined re-analysis of existing blank-field SCUBA surveys: comparative 850-µm source lists, combined number counts, and evidence for strong clustering of the bright submillimetre galaxy population on arcminute scales
Dunlop, J. S.; Serjeant, S.; Scott, S. E.
Since the advent of Submillimetre Common-User Bolometer Array (SCUBA) on the James Clerk Maxwell Telescope (JCMT), a series of complementary surveys has resolved the bulk of the far-infrared extragalactic background into discrete sources. This has revealed a population of heavily dust-obscured sources at high redshift (z > 1) undergoing an inte…
Are GRB980425 and GRB031203 real outliers or twins of GRB060218?
Ghirlanda, G.; Ghisellini, G.; Mereghetti, S. +3 more
GRB980425 and GRB031203 are apparently two outliers with respect to the correlation between the isotropic equivalent energy Eiso emitted in the prompt radiation phase and the peak frequency Epeak of the spectrum in a νFν representation (the so-called Amati relation). We discuss if these two bursts are really differ…
The black hole in NGC 3379: a comparison of gas and stellar dynamical mass measurements with HST and integral-field data
Shapiro, Kristen L.; Gebhardt, Karl; Cappellari, Michele +4 more
We combine Hubble Space Telescope spectroscopy and ground-based integral-field data from the SAURON and OASIS instruments to study the central black hole in the nearby elliptical galaxy NGC 3379. From these data, we obtain kinematics of both the stars and the nuclear gaseous component. Axisymmetric three-integral models of the stellar kinematics f…
Faint supernovae and supernova impostors: case studies of SN 2002kg/NGC 2403-V37 and SN 2003gm
Smartt, S. J.; Bresolin, F.; Maund, J. R. +6 more
Photometric and spectroscopic observations of the faint Supernovae (SNe) 2002kg and 2003gm, and their precursors, in NGC 2403 and NGC 5334, respectively, are presented. The properties of these SNe are discussed in the context of previously proposed scenarios for faint SNe: low-mass progenitors producing underenergetic SNe; SNe with ejecta constrai…
The 1-1000µm spectral energy distributions of far-infrared galaxies
Dole, H.; Lagache, G.; Scott, D. +3 more
Galaxies selected at 170µm by the Infrared Space Observatory (ISO) Far-IR BACKground (FIRBACK) survey represent the brightest ~10 per cent of the cosmic infrared background. Examining their nature in detail is therefore crucial for constraining models of galaxy evolution. Here, we combine Spitzer archival data with previous near-infrared (ne…
Further constraints on the evolution of Ks-selected galaxies in the GOODS/CDFS field
McLure, R. J.; Dunlop, J. S.; Cirasuolo, M. +2 more
We have selected and analysed the properties of a sample of 2905 Ks < 21.5 galaxies in ~131arcmin2 of the Great Observatories Origins Deep Survey (GOODS) Chandra Deep Field South (CDFS), to obtain further constraints on the evolution of Ks-selected galaxies with respect to the results already obtained in previou…
INTEGRAL and XMM-Newton observations of LSI +61° 303
Walter, R.; Chernyakova, M.; Neronov, A.
LSI +61° 303 is one of the few X-ray binaries with Be star companion from which both radio and high-energy γ-ray emission have been observed. We present XMM-Newton and INTEGRAL observations which reveal variability of the X-ray spectral index of the system. The X-ray spectrum is hard (photon index Γ ~= 1.5) during the orbital phases of both high a…
Absolute magnitudes of OB and Be stars based on Hipparcos parallaxes - II
Wegner, W.
A new method of determining absolute visual magnitudes of early-type stars, based on averaging Hipparcos parallaxes (ESA 1997) inside samples of the same spectrum and luminosity (Sp/L) classes, is proposed. The used sample consists of 6262 unreddened and reddened OB stars as well as 430 Be stars of luminosity classes Ia, Iab, Ib, II, III, IV and V…
Luminosity function of contact binaries based on the All Sky Automated Survey (ASAS)
Rucinski, Slavek M.
The luminosity function for contact binary stars of the W UMa type is evaluated on the basis of the All Sky Automated Survey (ASAS) photometric project covering all stars south of δ=+ 28° within a magnitude range 8 < V < 13. Lack of colour indices enforced a limitation to 3374 systems with P < 0.562 d (i.e. 73 per cent of all systems with…