Search Publications
Warm absorber energetics in broad-line radio galaxies
Costantini, E.; Grandi, P.; Torresi, E. +1 more
We review the soft X-ray properties of 3C 390.3, 3C 120, 3C 382 and 3C 445, the only broad-line radio galaxies (BLRGs) for which good quality gratings data are currently available. The XMM-Newton/Reflection Grating Spectrometer data of 3C 390.3 and 3C 120 were re-analysed searching for warm absorbers, already discovered in 3C 382 and 3C 445. We co…
The Cosmic Web and galaxy evolution around the most luminous X-ray cluster: RX J1347.5-1145
Finoguenov, A.; Böhringer, H.; Hildebrandt, H. +5 more
In this paper we study large-scale structures and their galaxy content around the most X-ray luminous cluster known, RX J1347.5-1145 at z= 0.45. We make use of u*g'r'i'z' Canada-France-Hawaii Telescope (CFHT) MegaCam photometry together with VIsible MultiObject Spectrograph (VIMOS) Very Large Telescope (VLT) spectroscopy to identify structures aro…
Alessi 95 and the short-period Cepheid SU Cassiopeiae
Gieren, W. P.; Alessi, B.; Storm, J. +6 more
The parameters for the newly discovered open cluster Alessi 95 are established on the basis of available photometric and spectroscopic data, in conjunction with new observations. Colour excesses for spectroscopically observed B- and A-type stars near SU Cas follow a reddening relation described by E(U-B)/E(B-V) = 0.83 + 0.02E(B-V), implying a valu…
A comprehensive study of RXTE and INTEGRAL observations of the X-ray pulsar 4U 1907+09
Şahiner, Ş.; Baykal, A.; Inam, S. Ç.
We analyse observations of the accretion-powered pulsar 4U 1907+09 from the International Gamma-Ray Astrophysics Laboratory (INTEGRAL; between 2005 October and 2007 November) and from the Rossi X-ray Timing Explorer (RXTE; between 2007 June and 2011 March). Using observations from the Imager on-board the INTEGRAL satellite (IBIS), the INTEGRAL Sof…
Acoustic spectrum fitting for a large set of solar-like pulsators
Baudin, F.; Chaplin, W. J.; Elsworth, Y. +2 more
Asteroseismology provides the means both to constrain the global properties and to probe the internal structures of stars. Asteroseismic data are now available on large numbers of solar-type stars, thanks in particular to the CoRoT and Kepler space missions, and automated data-analysis pipelines are needed to provide efficient and timely results. …
A time-variable, phase-dependent emission line in the X-ray spectrum of the isolated neutron star RX J0822-4300
Caraveo, P. A.; Bignami, G. F.; Tiengo, A. +9 more
RX J0822-4300 is the central compact object associated with the Puppis A supernova remnant. Previous X-ray observations suggested RX J0822-4300 to be a young neutron star with a weak dipole field and a peculiar surface temperature distribution dominated by two antipodal spots with different temperatures and sizes. An emission line at 0.8 keV was a…
Swift/X-ray Telescope monitoring of the candidate supergiant fast X-ray transient IGR J16418-4532
Gehrels, N.; Esposito, P.; Ducci, L. +6 more
We report on the Swift monitoring of the candidate supergiant fast X-ray transient (SFXT) IGR J16418-4532, for which both orbital and spin periods are known (∼3.7 d and ∼1250 s, respectively). Our observations, for a total of ∼43 ks, span over three orbital periods and represent the most intense and complete sampling of the light curve of this sou…
Predicting the number of giant arcs expected in the next-generation wide-field surveys from space
Meneghetti, Massimo; Giocoli, Carlo; Moscardini, Lauro +1 more
In this paper, we estimate the number of gravitational arcs detectable in a wide-field survey such as that which will be operated by the Euclid space mission, assuming a Λ cold dark matter cosmology. We use the publicly available code MOKA to obtain realistic deflection angle maps of mock gravitational lenses. The maps are processed by a ray-traci…
A deep ATCA 20 cm radio survey of the AKARI Deep Field South near the South Ecliptic Pole
Goto, Tomotsugu; Nakagawa, Takao; Shirahata, Mai +18 more
The results of a deep radio survey at 20 cm wavelength are reported for a region containing the AKARI Deep Field South (ADF-S) near the South Ecliptic Pole (SEP), using the Australia Telescope Compact Array (ATCA). The survey (hereafter referred to as the ATCA-ADFS survey) has 1σ detection limits ranging from 18.7 to 50 µJy beam-1…
Empirical constraints of supergalactic winds at z≳ 0.5
Chen, Hsiao-Wen; Gauthier, Jean-René
Under the hypothesis that Mg II absorbers found near the minor axis of a disc galaxy originate in the cool phase of supergalactic winds, we carry out a study to constrain the properties of large-scale galactic outflows at redshift zgal ≳ 0.5 based on the observed relative motions of individual absorbing clouds with respect to the positi…