Search Publications
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…
The orbital solution and spectral classification of the high-mass X-ray binary IGR J01054-7253 in the Small Magellanic Cloud
Haberl, F.; Udalski, A.; Hill, A. B. +11 more
We present X-ray and optical data on the Be/X-ray binary (BeXRB) pulsar IGR J 01054-7253= SXP11.5 in the Small Magellanic Cloud (SMC). Rossi X-ray Timing Explorer (RXTE) observations of this source in a large X-ray outburst reveal an 11.483 ± 0.002 s pulse period and show both the accretion-driven spin-up of the neutron star and the motion of the …
Cross-correlation between the cosmic microwave and infrared backgrounds for integrated Sachs-Wolfe detection
Lagache, Guilaine; Douspis, Marian; Ilić, Stéphane +2 more
We investigate the cross-correlation between the cosmic infrared background (CIB) and cosmic microwave background (CMB) anisotropies due to the integrated Sachs-Wolfe (ISW) effect. We first describe the CIB anisotropies using a linearly biased power spectrum, valid on the angular scales of interest. From this, we derive the theoretical angular pow…
A new grid of synthetic spectra for the analysis of [WC]-type central stars of planetary nebulae
Bianchi, Luciana; Bohlin, Ralph C.; Herald, James E. +2 more
We present a comprehensive grid of synthetic stellar-atmosphere spectra, suitable for the analysis of high-resolution spectra of hydrogen-deficient post-asymptotic giant branch objects hotter than 50 000 K, migrating along the constant luminosity branch of the Hertzsprung-Russell diagram. The grid was calculated with CMFGEN, a state-of-the-art ste…
The Simultaneous Medicina-Planck Experiment: data acquisition, reduction and first results
Bonavera, L.; Burigana, C.; Cuttaia, F. +13 more
The Simultaneous Medicina-Planck Experiment (SiMPlE) is aimed at observing a selected sample of 263 extragalactic and Galactic sources with the Medicina 32-m single-dish radio telescope in the same epoch as the Planck satellite observations.
The data, acquired with a frequency coverage down to 5 GHz and combined with Planck at frequencies abo…Evidence for a merger-revived radio phoenix in MaxBCG J217.95869+13.53470
Simionescu, A.; Croston, J. H.; Brüggen, M. +3 more
We use XMM-Newton observations of the galaxy cluster MaxBCG J217.95869+13.53470 to analyse its physical properties and dynamical state. MaxBCG J217.95869+13.53470 is found at a redshift of 0.16, has a mass of ∼1 × 1014 M⊙ and a luminosity of 7.9 × 1043 erg s-1. The temperature map shows the presence of h…
Chemical abundances in the protoplanetary disc LV 2 (Orion) - II. High-dispersion VLT observations and microjet properties
Tsamis, Y. G.; Walsh, J. R.
Integral field spectroscopy of the LV 2 proplyd is presented taken with the Very Large Telescope (VLT)/FLAMES Argus array at an angular resolution of 0.31 × 0.31 arcsec2 and velocity resolutions down to 2 km s-1 pixel-1. Following subtraction of the local M42 emission, the spectrum of LV 2 is isolated from the surr…
Rotational effects in the system of proper motions of the UCAC3 catalogue
Bobylev, V. V.; Khovritchev, M. Yu.
A set of ≈8 million single stars of the UCAC3 catalogue has been analysed. It contains stars with reliable proper motions with not less than three epochs of observations used to compute the proper motion. Our main goal is to investigate the inertiality of the reference system defined by 'good' stars of the UCAC3 catalogue. The formalism of vectori…
X-ray and optical observations of the closest isolated radio pulsar
Tiengo, A.; de Luca, A.; Mereghetti, S. +3 more
With a parallactic distance of 170 pc, PSR J2144-3933 is the closest isolated radio pulsar currently known. It is also the slowest (P= 8.51 s) and least energetic (? erg s-1) radio pulsar; its radio emission is difficult to account for with standard pulsar models, since the position of PSR J2144-3933 in the period-period derivative diag…
An X-ray view of the INTEGRAL/IBIS blazars
de Rosa, A.; Ubertini, P.; Bassani, L. +3 more
The aim of this work is a broad-band study, using the INTEGRAL, Swift and XMM-Newton satellites, of a sample of nine blazars (seven flat-spectrum radio quasars and two BL Lacertae objects) with redshift (z) up to about 4. The spectral analysis has shown clear evidence of a flattening of the continuum towards low energies (E < 3 keV observer fra…