Search Publications
MLS110213:022733+130617: a new eclipsing polar above the period gap
Costa, J. E. R.; Oliveira, A. S.; Rodrigues, C. V. +4 more
This study confirms MLS110213:022733+130617 as a new eclipsing polar. We performed optical spectroscopic, polarimetric and photometric follow-up of this variable source identified by the Catalina Real Time Transient Survey. Using the mid-eclipse times, we estimated an orbital period of 3.787 h, which is above the orbital period gap of the cataclys…
Exploring the active galactic nuclei population with extreme X-ray-to-optical flux ratios (fx/fo > 50)
Ballo, L.; Carrera, F. J.; Watson, M. G. +8 more
The cosmic history of the growth of supermassive black holes in galactic centres parallels that of star formation in the Universe. However, an important fraction of this growth occurs inconspicuously in obscured objects, where ultraviolet/optical/near-infrared emission is heavily obscured by dust. Since the X-ray flux is less attenuated, a high X-…
Low-end mass function of the arches cluster
Kim, Sungsoo S.; Shin, Jihye
The initial mass function (IMF) of the Arches cluster, which was formed a few million years ago in the harsh environment of the Galactic Centre (GC), has long been a target of interest to those who study the GC and the theory of star formation. The distinct star-forming conditions in the GC might have caused the cluster to have a shallower slope o…
Outer and inner mass distributions of the irregular galaxies UGC 4284 and UGC 11861: constraining the baryonic content through stellar population synthesis studies
Rosado, M.; Gabbasov, R.; Repetto, P. +1 more
In this paper, we investigate the outer and inner mass distributions of the irregular galaxies UGC 4284 and UGC 11861, taking advantage of published H I and H α high-resolution rotation curves and constraining the stellar disc of both galaxies throughout stellar population synthesis studies. In addition, we take into account the gas content of bot…
The CIB-lensing bispectrum: impact on primordial non-Gaussianity and detectability for the Planck mission
Curto, A.; Kunz, M.; Martínez-González, E. +1 more
We characterize the cosmic infrared background (CIB)-lensing bispectrum which is one of the contributions to the three-point functions of cosmic microwave background (CMB) maps in harmonic space. We show that the CIB-lensing bispectrum has a considerable strength and that it can be detected with high significance in the Planck high-frequency maps.…
Late-time spectroscopy of SN 2002hh: a continued visible light echo with no shock interaction yet
Smith, Nathan; Mauerhan, Jon C.; Andrews, J. E.
Supernova (SN) 2002hh was unusual among core-collapse SNe because it was highly reddened, and displayed a bright infrared (IR) excess due to radiatively heated dust in its circumstellar medium (CSM). Estimates for the mass of dust responsible for the IR echo suggested the presence of a massive shell within 0.26 pc of the star. For a velocity of 50…
Centaurus A: constraints on the nature of the giant lobe filaments from XMM-Newton observations
Croston, Judith H.; Hardcastle, Martin J.; Wykes, Sarka
We report on deep XMM-Newton observations of the vertex filament in the southern giant lobe of the Fanaroff-Riley class I radio galaxy Centaurus A. We find no X-ray excess from the filament region and place a 3σ upper limit on the 1 keV flux density of the filament of 9.6 nJy. This directly constrains the electron density and magnetic field streng…
Modelling galaxy spectra in presence of interstellar dust - III. From nearby galaxies to the distant Universe
Cassarà, L. P.; Piovan, L.; Chiosi, C.
Improving upon the standard evolutionary population synthesis technique, we present spectrophotometric models of galaxies with morphology going from spherical structures to discs, properly accounting for the effect of dust in the interstellar medium (ISM). The models contain three main physical components: the diffuse ISM made of gas and dust, the…
Sample of optically unidentified X-ray binaries in the Galactic bulge: constraints on the physical nature from infrared photometric surveys
Zolotukhin, Ivan Yu.; Revnivtsev, Mikhail G.
We report on archival near-infrared and mid-infrared observations of seven persistent X-ray sources situated in the Galactic bulge, using data from the UK Infrared Telescope (UKIRT) Infrared Deep Sky Survey (UKIDSS), the Spitzer Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE) and the Wide-field Infrared Survey Explorer (WISE) al…
CARMA observations of Galactic cold cores: searching for spinning dust emission
Paladini, R.; Ysard, N.; Laureijs, R. J. +9 more
We present the first search for spinning dust emission from a sample of 34 Galactic cold cores, performed using the CARMA interferometer. For each of our cores, we use photometric data from the Herschel Space Observatory to constrain bar{N}H, bar{T}d, bar{n}H, and bar{G}0. By computing the mass of the co…