Search Publications
A deep proper-motion survey of the nearby open cluster Blanco 1
Barnes, S. A.; James, D. J.; Pourbaix, D. +10 more
We provide two comprehensive catalogues of positions and proper motions in the area of open cluster Blanco 1. The main catalogue, CTLGM, contains 6271 objects down to V∼ 18.5 and covers a circular ∼11 deg2 area. The accuracy of CTLGM proper motions, at about 0.3-0.5 mas yr-1 for well-measured stars, permits an excellent segre…
Orbital and spin phase-resolved spectroscopy of the intermediate polar EX Hya using XMM-Newton data
Balman, S.; Pekön, Y.
We present the orbital phase-resolved spectra of an intermediate polar, EX Hya, together with the spin phase-resolved spectra during two different epochs using the X-ray Multi-Mirror Mission (XMM-Newton), European Photon Imaging Camera (pn instrument). We find that the source at the two epochs has the same X-ray luminosity of ∼6.5 × 1031
X-ray and optical properties of broad absorption line quasars in the Canada-France-Hawaii Telescope Legacy Survey
Stalin, C. S.; Petitjean, P.; Srianand, R.
We study the X-ray and optical properties of 16 broad absorption line (BAL) quasars detected in a ≈3 deg2 region common to the wide synoptic (W-1) component of the Canada-France-Hawaii Telescope Legacy Survey (CFHTLS) and the XMM Large Scale Structure Survey (XMM-LSS). The BAL fraction is found to be 10 per cent in the full sample, 7 pe…
XMM-Newton first X-ray detection of the low-ionization broad absorption line quasar PG 1700+518
Vignali, C.; Schartel, N.; Ballo, L. +1 more
We report the first high-energy detection of PG 1700+518, a well-known low-ionization broad absorption line quasar (quasi-stellar object, QSO). Due to previous X-ray non-detection, it was classified as soft X-ray weak QSO. We observed PG 1700+518 with XMM-Newton for about 60 ks divided in three exposures. The spectrum below 2 keV is very steep, Γ∼…
The 17-min orbital period in the ultracompact X-ray binary 4U 0513-40
Fiocchi, M.; Ubertini, P.; Landi, R. +2 more
The ultracompact low-mass X-ray binary 4U 0513-40 in the globular cluster NGC1851 exhibits large amplitude X-ray flux variations with spectral changes from low/hard to high/soft states which have not been reported previously in other ultracompact X-ray binaries. Using BeppoSAX, Chandra and XMM-Newton archival data together with recent INTEGRAL obs…
Searching for active galactic nuclei among unidentified INTEGRAL sources
Palazzi, E.; Minniti, D.; Masetti, N. +13 more
We report on a new method to identify active galactic nuclei (AGNs) among unidentified INTEGRAL sources. This method consists of cross-correlating unidentified sources listed in the fourth Imager on Board the INTEGRAL Satellite (IBIS) Survey Catalogue first with infrared and then with radio catalogues and a posteriori verifying, by means of X-ray …
Directed follow-up strategy of low-cadence photometric surveys in search of transiting exoplanets - I. Bayesian approach for adaptive scheduling
Zucker, Shay; Dzigan, Yifat
We propose a novel approach to utilize low-cadence photometric surveys for exoplanetary transit search. Even if transits are undetectable in the survey data base alone, it can still be useful for finding preferred times for directed follow-up observations that will maximize the chances to detect transits. We demonstrate this approach through a few…
Molecular accretion in the core of the galaxy cluster 2A 0335+096
McNamara, B. R.; Edge, A. C.; Wilman, R. J. +1 more
We present adaptive optics-assisted K-band integral field spectroscopy of the central cluster galaxy in 2A 0335+096 (z= 0.0349). The H2 v=1-0 S(1) emission is concentrated in two peaks within 600 pc of the nucleus and fainter but kinematically active emission extends towards the nucleus. The H2 is in a rotating structure whic…
Observation and modelling of main-sequence star chromospheres - XV. New constraints on the dynamo mechanisms for dM1 stars
Houdebine, E. R.
With the help of measures of rotation, radius and metallicity for a selected sample of dM1 stars (with Teff= 3460 ± 60 K), we aim to set new constraints on the dynamo mechanisms.
We recover 913 high-resolution spectra for 97 different M1 dwarfs from the European Southern Observatory and Observatoire de Haute Provence data bases. We…The double galaxy cluster Abell 2465 - I. Basic properties: optical imaging and spectroscopy
Wegner, Gary A.
Optical imaging and spectroscopic observations of the z= 0.245 double galaxy cluster Abell 2465 are described. This object appears to be undergoing a major merger. It is a double X-ray source and is detected in the radio at 1.4 GHz. The purpose of this paper is to investigate signatures of the interaction of the two components. Redshifts were meas…