Search Publications

INTEGRAL long-term monitoring of the supergiant fast X-ray transient XTE J1739-302

Pottschmidt, K.; Reig, P.; Torrejón, J. M. +6 more

Context: In the past few years, a new class of high mass X-ray binaries (HMXRB) has been claimed to exist, the supergiant fast X-ray transients (SFXT). These are X-ray binary systems with a compact companion orbiting a supergiant star which show very short and bright outbursts in a series of activity periods overimposed on longer quiescent periods…

XMM-Newton slew survey discovery of the nova XMMSL1 J070542.7-381442 (V598 Puppis)

Read, A. M.; Esquej, P.; Challis, P. +6 more

Aims: In an attempt to catch new X-ray transients while they are still bright, the data taken by XMM-Newton as it slews between targets are being processed and cross-correlated with other X-ray observations as soon as the slew data appear in the XMM-Newton archive.
Methods: A bright source, XMMSL1 J070542.7-381442, was detected on 9 Oct. 2007 …

Forced oscillations of coronal loops driven by EIT waves

Ballai, I.; Douglas, M.; Marcu, A.

Aims: We study the generation of transversal oscillations in coronal loops represented as a straight thin flux tube under the effect of an external driver modelling the global coronal EIT wave. We investigate how the generated oscillations depend on the nature of the driver, and the type of interaction between the two systems.
Methods: We cons…

Nonthermal and thermal diagnostics of a solar flare observed with RESIK and RHESSI

Mason, H. E.; Del Zanna, G.; Sylwester, B. +4 more

Aims: We aim to prove and diagnose the occurrence of nonthermal electron distributions in solar flare plasma using X-ray spectral observations.
Methods: An M4.9 flare on 2003 January 7/8 was observed with the RESIK instrument in the 3-6 Å wavelength range (2-4 keV) and with RHESSI at energies above 6 keV. The temporal behavior of RESIK flare s…

Surface properties of Rosetta's targets (21) Lutetia and (2867) Steins from ESO observations

Barucci, M. A.; Fornasier, S.; Lowry, S. +3 more

Aims: The aim of this work is to constrain the size, composition and surface properties of asteroids (2867) Steins and (21) Lutetia, targets of the Rosetta mission. Rosetta is en route to rendezvous with comet 67P/Churyumov-Gerasimenko.
Methods: Thermal-Infrared N-band observations for Lutetia and Steins were obtained using, respectively, TIMM…

Radiative and magnetic properties of solar active regions. I. Global magnetic field and EUV line intensities

Fludra, A.; Ireland, J.

Context: The relationships between the photospheric magnetic flux and either the X-ray or extreme ultraviolet emission from the solar atmosphere have been studied by several authors. Power-law relations have been found between the total magnetic flux and X-ray flux or intensities of the chromospheric, transition region, and coronal emission lines …

New deep XMM-Newton observations to the west of the σ Orionis cluster

Caballero, J. A.; López-Santiago, J.

Aims: The objective of this study is to determine the general X-ray properties of the young stars in the external regions of the σ Orionis cluster (τ ~ 3 Ma, d ~ 385 pc) and determine constraints on the X-ray emission of brown dwarfs.
Methods: We carried out a careful analysis of public data obtained from an unexplored region to the west of th…

Doppler imaging an X-ray flare on the ultrafast rotator BO Mic. A contemporaneous multiwavelength study using XMM-Newton and VLT

Schmitt, J. H. M. M.; Wolter, U.; Robrade, J. +1 more

We present an analysis of contemporaneous photospheric, chromospheric and coronal structures on the

highly active K-dwarf star BO Mic (Speedy Mic). We concentrate on a moderate flare that we localize in the stellar

atmosphere and study its energetics, size and thermal behavior.

The analysis is based on strictly

simultaneous X-r…

INTEGRAL detection of the pulsar wind nebula in PSR J1846-0258

de Rosa, A.; Hill, A. B.; Bird, A. J. +6 more

Aims:We communicate the detection of soft (20-200 keV) γ-rays from the pulsar and pulsar wind nebula of PSR J1846-0258 and aim to identify the component of the system which is responsible for the γ-ray emission.
Methods: We combine spectral information from the INTEGRAL γ-ray mission with archival data from the Chandra X-ray Observatory to pin…

Evidence for metallicity spreads in three massive M 31 globular clusters

Jablonka, P.; Sarajedini, A.; Meylan, G. +3 more

Aims: We quantify the intrinsic width of the red giant branches of three massive globular clusters in M 31 in a search for metallicity spreads within these objects.
Methods: We present HST/ACS observations of three massive clusters in M 31, G78, G213, and G280. A thorough description of the photometry extraction and calibration is presented. A…