Search Publications
Linking the structural properties of galaxies and their star formation histories with STAGES
Bell, Eric F.; Wolf, Christian; Aragón-Salamanca, Alfonso +5 more
We study the links between star formation history and structure for a large mass-selected galaxy sample at 0.05 ≤ zphot ≤ 0.30. The galaxies inhabit a very broad range of environments, from cluster cores to the field. Using Hubble Space Telescope (HST) images, we quantify their structure following Hoyos et al., and divide them into dist…
Starbursting brightest cluster galaxy: a Herschel view of the massive cluster MACS J1931.8-2634
Altieri, B.; Valtchanov, I.; Grillo, C. +9 more
We investigate the dust-obscured star formation (SF) properties of the massive, X-ray-selected galaxy cluster MACS J1931.8-2634 at z = 0.352. Using far-infrared (FIR) imaging in the range 100-500 µm obtained with the Herschel telescope, we extract 31 sources (2σ) within r ∼ 1 Mpc from the brightest cluster galaxy (BCG). Among these sources, …
XMM-Newton large programme on SN1006 - II. Thermal emission
Vink, Jacco; Miceli, Marco; Bocchino, Fabrizio +2 more
Based on the XMM-Newton large programme on SN1006 and our newly developed tools for spatially resolved spectroscopy analysis as described in Li et al. (Paper I), we study the thermal emission from interstellar medium (ISM) and ejecta of SN1006 by analysing the spectra extracted from 583 tessellated regions dominated by thermal emission. With some …
Triple-ionized carbon associated with the low-density neutral hydrogen gas at 1.7 < z < 3.3: the integrated N H I-N C IV relation
Cristiani, S.; Carswell, R. F.; Kim, T. -S. +4 more
From the Voigt profile fitting analysis of 183 intervening {C IV} systems at 1.7 < z < 3.3 in 23 high-quality UVES/VLT and HIRES/Keck QSO spectra, we find that a majority of {C IV} systems (∼75 per cent) display a well-characterized scaling relation between integrated column densities of {H I} and {C IV} with a negligible redshift evolution,…
Near-infrared observations of PSR J1357-6429
Mennickent, R. E.; Zharikov, S.; Kirichenko, A. +3 more
PSR J1357-6429 is a young radio pulsar that has been detected in the X-ray and γ-ray bands. We present high spatial resolution near-infrared imaging of the pulsar field in the J, H and Ks bands obtained using the VLT/NaCo with the Adaptive Optic system. We found a faint source at the most precise pulsar radio position, which we propose …
Multiwavelength study of RX J2015.6+3711: a magnetic cataclysmic variable with a 2-h spin period
Campana, S.; de Martino, D.; Rea, N. +4 more
The X-ray source RX J2015.6+3711 was discovered by ROSAT in 1996 and recently proposed to be a cataclysmic variable (CV). Here, we report on an XMM-Newton observation of RX J2015.6+3711 performed in 2014, where we detected a coherent X-ray modulation at a period of 7196 ± 11 s and discovered other significant (>6σ) small-amplitude periodicities…
The XMM-Newton spectra of the 2012 outburst of the black hole candidate 4U 1630-47 revisited
Méndez, Mariano; Wang, Yanan
Recent XMM-Newton observations of the black hole candidate 4U 1630-47 during the 2012 outburst revealed three relativistically Doppler-shifted emission lines that were interpreted as arising from baryonic matter in the jet of this source. Here, we reanalyse those data and find an alternative model that, with less free parameters than the model wit…
Extensive X-ray variability studies of NGC 7314 using long XMM-Newton observations
Papadakis, I. E.; Vaughan, S.; Emmanoulopoulos, D. +1 more
We present a detailed X-ray variability study of the low-mass active galactic nuclei (AGN) NGC 7314 using the two newly obtained XMM-Newton observations (140 and 130 ks), together with two archival data sets of shorter duration (45 and 84 ks). The relationship between the X-ray variability characteristics and other physical source properties (such…
Envelope overshooting in low-metallicity intermediate- and high-mass stars: a test with the Sagittarius dwarf irregular galaxy
Slemer, Alessandra; Marigo, Paola; Bianchi, Luciana +5 more
We check the performance of the Padova TRieste Stellar Evolution Code (PARSEC) tracks in reproducing the blue loops of intermediate age and young stellar populations at very low metallicity. We compute new evolutionary PARSEC tracks of intermediate- and high-mass stars from 2 to 350 M⊙ with enhanced envelope overshooting (EO), EO = 2H
Temporal features of LS I +61°303 in hard X-rays from the Swift/BAT survey data
Cusumano, G.; La Parola, V.; Segreto, A. +2 more
We study the long-term spectral and timing behaviour of LS I +61°303 in hard X-rays (15-150 keV) using ∼10 years of survey data from the Swift Burst Alert Telescope (BAT) monitor. We focus on the detection of long periodicities known to be present in this source in multiple wavelengths. We clearly detect three periods: the shorter one at 26.48 d i…