Search Publications
A close look at the Centaurus A group of galaxies. III. Recent star formation histories of late-type dwarfs around M 83
Crnojević, D.; Grebel, E. K.; Cole, A. A.
Aims: We study the resolved stellar populations of dwarf galaxies in the nearby Centaurus A/M 83 group of galaxies. Our goal is to characterize their evolutionary history and to investigate eventual similarities or differences with the dwarf population in other group environments.
Methods: This work presents the analysis of five late-typ…
Dipping in CygnusX-2 in a multi-wavelength campaign due to absorption of extended ADC emission
Wilms, J.; Spencer, R. E.; Hanke, M. +5 more
We report results of one-day simultaneous multiwavelength observations of CygnusX-2 using XMM, Chandra, the European VLBI Network and the XMM Optical Monitor. During the observations, the source did not exhibit Z-track movement, but remained in the vicinity of the soft apex. It was in a radio quiescent/quiet state of <150 µJy. Strong dip …
A molecular cloud within the light echo of V838 Monocerotis
Deguchi, S.; Tylenda, R.; Kamiński, T.
Context. V838 Mon is an eruptive variable, which exploded in 2002. It displayed the most spectacular light echo ever observed. However, neither the origin of the reflecting matter nor the nature of the 2002 outburst have been firmly constrained.
Aims: We investigate the nature of the CO radio emission detected in the field of the light echo. …
X-ray spectroscopy of the Compton-thick Seyfert 2 ESO 138 - G1
Fiore, F.; Bianchi, S.; Vignali, C. +2 more
We report on our analysis of XMM-Newton observations of the Seyfert 2 galaxy ESO 138-G1(z = 0.0091). These data reveal a complex spectrum in both its soft and hard portions. The 0.5-2 keV band is characterized by a strong "soft-excess" component with several emission lines, as commonly observed in other narrow-line AGN. Above 3 keV, a power-law fi…
The high resolution X-ray spectrum of SNR 0506-68 using XMM-Newton
Vink, J.; Broersen, S.; Raymond, J. +1 more
Aims: We study the supernova remnant 0506-68 in order to obtain detailed information about, among other things, the ionisation state and age of the ionised plasma.
Methods: Using the Reflection Grating Spectrometer (RGS) onboard the XMM-Newton satellite we are able to take detailed spectra of the remnant. In addition, we use the MOS data…
XMM-Newton observation of the enigmatic object WR 46
Gosset, E.; Nazé, Y.; Rauw, G. +5 more
Aims: To further investigate the nature of the enigmatic object WR 46 and better understand the X-ray emission in massive stars and in their evolved descendants, we observed this variable object for more than two of its supposed cycles. The X-ray emission characteristics are appropriate indicators of the difference between a genuine Wolf-Raye…
The XMM-Newton view of the eclipse and dips of the dwarf nova Z Chamaleontis
Kuulkers, E.; Nucita, A. A.; Ingrosso, G. +3 more
Context. A cataclysmic variable contains a white dwarf that accretes material from a secondary star via the Roche lobe mechanism. Systems with high line-of-sight inclination angles offer the possibility to pinpoint the location of the X-ray emitting region by characterizing the observed eclipse by the secondary star.
Aims: We present an XMM-N…
Interstellar H2 toward HD 37903
Gnaciński, P.
We present an analysis of interstellar H2 toward
Discovery of X-ray flaring activity in the Arches cluster
Czesla, S.; Cappelluti, N.; Capelli, R. +4 more
Context. We present a study of the Arches cluster based on XMM-Newton observations performed over the past 8 years. Unexpectedly, we find that the X-ray emission associated with the cluster experienced a marked brightening in March/April 2007.
Aims: We investigate the origin of both the X-ray continuum emission emanating from the star cluster…
Far-infrared constraints on the contamination by dust-obscured galaxies of high-z dropout searches
Smail, I.; Kneib, J. -P.; Magnelli, B. +23 more
The spectral energy distributions (SED) of dusty galaxies at intermediate redshift may look similar to very high-redshift galaxies in the optical/near infrared (NIR) domain. This can lead to the contamination of high-redshift galaxy searches based on broad-band optical/NIR photometry by lower redshift dusty galaxies because both kind of galaxies c…