Search Publications
Chandra localization and optical/near-infrared follow-up of Galactic X-ray sources
Miller-Jones, J. C. A.; Kuiper, L.; Torres, M. A. P. +3 more
We investigate a sample of 11 Galactic X-ray sources recently discovered with INTEGRAL or RXTE with the goal of identifying their optical and/or near-infrared (NIR) counterpart. For this purpose, new Chandra positions of nine objects are presented together with follow-up observations of all the targets in the optical and NIR. For the four sources …
Optical identification of XMM sources in the Canada-France-Hawaii Telescope Legacy Survey
Petitjean, Patrick; Stalin, C. S.; Schwope, A. +3 more
We present optical spectroscopic identifications of X-ray sources in ~3 deg2 of the XMM-Large Scale Structure survey (XMM-LSS), also covered by the Canada-France-Hawaii Telescope Legacy Survey (CFHTLS), obtained with the AAOmega instrument at the Anglo-Australian Telescope. In a flux-limited sample of 829 point-like sources in the optic…
The quasar MBH-Mhost relation through cosmic time - I. Data set and black hole masses
Falomo, R.; Treves, A.; Decarli, R. +3 more
We study the relation as a function of cosmic time in a sample of 96 quasars from z = 3 to the present epoch. In this paper, we describe the sample, the data sources and the new spectroscopic observations. We then illustrate how we derive from single-epoch spectra, pointing out the uncertainties in the procedure. In a companion paper, we address t…
C, N and O abundances in red clump stars of the Milky Way
Ilyin, I.; Edvardsson, B.; Tautvaišienė, G. +2 more
The Hipparcos orbiting observatory has revealed a large number of helium-core-burning ‘clump’ stars in the Galactic field. These low-mass stars exhibit signatures of extra mixing processes that require modelling beyond the first dredge-up of standard models. The 12C/13C ratio is the most robust diagnostic of deep mixing becau…
Swift/XRT observations of unidentified INTEGRAL/IBIS sources
Bird, A. J.; Fiocchi, M.; Landi, R. +4 more
The most recent IBIS/ISGRI survey, i.e. the fourth one, lists 723 hard X-ray sources, many still unidentified, i.e. lacking an X-ray counterpart or simply not studied at lower energies, i.e. below 10keV. In order to overcome this lack of X-ray information, we cross-correlated the list of IBIS sources included in the fourth IBIS catalogue with the …
Spectroscopy of z∼ 5 Lyman break galaxies in the ESO Remote Galaxy Survey
Milvang-Jensen, Bo; Bremer, M. N.; Lehnert, M. D. +2 more
We present the global results of a large spectroscopic survey carried out in order to identify z∼ 5 Lyman break galaxies (LBGs) across 10 widely separated ∼45 arcmin2 fields to a depth of IAB= 26.3. The redshifts of seventy 4.6 < z < 5.6 LBGs were identified through their Lyα emission and/or a strong continuum break, wi…
The physical scale of the far-infrared emission in the most luminous submillimetre galaxies - II. Evidence for merger-driven star formation
Wilner, David J.; Yun, Min S.; Fazio, Giovanni G. +10 more
We present high-resolution 345-GHz interferometric observations of two extremely luminous (Lir >~ 1013 Lsolar), submillimetre-selected galaxies (SMGs) in the Cosmic Evolution Survey (COSMOS) field with the Submillimeter Array (SMA). Both targets were previously detected as unresolved point sources by the SMA in …
Discovery of the 51.47-d orbital period in the supergiant fast X-ray transient XTE J1739-302 with INTEGRAL
Hill, A. B.; Bird, A. J.; Scaringi, S. +5 more
Timing analysis of ∼12.4 Ms of INTEGRAL/IBIS data has revealed a period of 51.47 ± 0.02 d in the supergiant fast X-ray transient source XTE J1739-302/IGR J17391-3021 that can be interpreted as an orbital period. An outburst history showing 35 epochs of activity has been produced, showing X-ray outbursts throughout the orbit of XTE J1739-302. Possi…
The SARS algorithm: detrending CoRoT light curves with Sysrem using simultaneous external parameters
Aigrain, Suzanne; Guillot, Tristan; Erikson, Anders +31 more
Surveys for exoplanetary transits are usually limited not by photon noise but rather by the amount of red noise in their data. In particular, although the CoRoT space-based survey data are being carefully scrutinized, significant new sources of systematic noises are still being discovered. Recently, a magnitude-dependant systematic effect was disc…
Star formation histories within the Antennae galaxies (Arp244)
Kong, Xu; Gao, Yu; Zhang, Hong-Xin
With the imagery from Galaxy Evolution Explorer, Hubble Space Telescope, Two Micron All Sky Survey and Spitzer and at the resolution of Multiband Imaging Photometer for Spitzer (MIPS) 24µm (~6arcsec), we study the variations of the broad-band spectral energy distributions of star-forming regions within the nearest prototypal major merger - t…