Search Publications

The INTEGRAL high energy sky and the MeV-GeV connection

de Rosa, A.; Bird, A. J.; Ubertini, P. +5 more

After more than 6 years of operation, ESAs INTEGRAL Space Observatory has produced a wide number of results, ranging from the inventory of the high energy sources, depicting a gamma-ray sky populated by more than 700 high energy objects, to the discovery of the new class of Super Giant Fast X-ray Transient (SFXT) to dozens of variable galactic and…

Galaxy Evolution in the Environment of RDCS J1252.9-2927 atz~1.24 (I)

Popescu, Nedelia Antonia

Optical Emission Lines and the X-ray Properties of Type 1 Seyfert Galaxies

Popović, L. Č.; La Mura, G.; Ciroi, S. +3 more

In this contribution we report on the study of the optical emission lines and X-ray spectra of a sample of Type 1 AGNs, collected from the SDSS database and observed by the XMM-Newton satellite. Using different instruments onboard XMM, we identify the spectral components of the soft and hard energy bands (in the range from 0.3 keV to 10 keV). The …

Are Boxy/Disky Ellipticals Dependent on Environment?

Häußler, B.; Gray, M.

Boxy and disky isophotes in elliptical galaxies are an imprint of their formation history. It is thus interesting to examine the boxyness of early-type galaxies as a function of environment in large cluster systems, especially as some N-body simulations also predict a higher number of disky versus boxy ellipticals in overdense regions. Using high-…

The Properties of the Stellar Nuclei with the Host Galaxy Morphology in the ACSVCS

Lee, Hyun-Chul

We have revisited the ACS Virgo Cluster Survey (ACSVCS), a Hubble Space Telescope program to obtain ACS/WFC g and z bands imaging for a sample of 100 early-type galaxies in the Virgo Cluster. In this study, we examine 51 nucleated early-type galaxies in the ACSVCS in order to look into the relationship between the photometric and structural proper…

X-ray study of local infrared bright galaxies

Jiménez-Bailón, E.; Santos-Lleo, M.; Rieke, G. H. +3 more

We are carrying out detailed study of the X-ray and infrared (IR) properties of a sample of local (d < 70 Mpc) luminous infrared galaxies (LIRGs) using XMM-Newton and Spitzer (imaging and spectroscopy). The main goal is to study the extreme processes of star formation and/or active galactic nuclei (AGN) taking place in this cosmologically impor…

Accurate Mapping of the Torsional Oscillations: a Trade-Off Study between Time Resolution and Mode Characterization Precision

Eff-Darwich, A.; Korzennik, S. G.

One salient result of global helioseismology is the mapping of the so-called torsional oscillations below the solar surface. These subsurface flows are inferred by inverting rotational frequency splitting sets of global modes. These flows extend down to a depth of at least 0.8 R, and are likely associated with the activity cycle of our star. To be…

Hints on the Broad Line Region Structure of Quasars at High and Low Luminosities

Sulentic, Jack W.; Marziani, Paola; Dultzin, Deborah +2 more

Quasars show a considerable spectroscopic diversity. However, the variety of quasar spectra at low redshifts is non-random: a principal component analysis applied to large samples customarily identifies two main eigenvectors. In this contribution we show that the range of quasar optical spectral properties observed at low-z\ and associated with th…

New results from ground-based observations of asteroid 21 Lutetia prior to the Rosetta fly-by

Lara, L. M.; Duffard, R.; de León, J.

On its journey to comet 67P/Churyumov-Gerasimenko, the International Rosetta Mission (ESA) was planned to fly-by two asteroids: (2867) Steins and (21) Lutetia. (21) Lutetia was encountered on July 10th 2010. Although classified as an M-type asteroid due to its high albedo, its reflectance spectrum in the near and mid-infrared region, suggests a pr…

Autocorrelation analysis of the Crimean and Hipparcos photometry of the runaway star HD 188001

Barannikov, A. A.

Crimean photoelectric photometry and Hipparcos epoch photometry of runaway star HD 188001 are presented. Data processing of this observation by a form of autocorrelation analysis confirms the periodic (P = 32.514~d) variability of this star.