Search Publications
CAIXA: a catalogue of AGN in the XMM-Newton archive. III. Excess variance analysis
Bianchi, S.; Ponti, G.; Guainazzi, M. +4 more
Context. We report on the results of the first XMM-Newton systematic "excess variance" study of all the radio quiet, X-ray un-obscured AGN. The entire sample consist of 161 sources observed by XMM-Newton for more than 10 ks in pointed observations, which is the largest sample used so far to study AGN X-ray variability on time scales less than a da…
X-ray variability of 104 active galactic nuclei. XMM-Newton power-spectrum density profiles
Vaughan, S.; González-Martín, O.
Context. Active galactic nuclei (AGN), powered by accretion onto supermassive black holes (SMBHs), are thought to be scaled up versions of Galactic black hole X-ray binaries (BH-XRBs). In the past few years evidence of such correspondence include similarities in the broadband shape of the X-ray variability power spectra, with characteristic bend t…
Hint of a transiting extended atmosphere on 55 Cancri b
Moutou, C.; Bonfils, X.; Ehrenreich, D. +9 more
The naked-eye star
A tidal disruption-like X-ray flare from the quiescent galaxy SDSS J120136.02+300305.5
Read, A. M.; Esquej, P.; Komossa, S. +4 more
Aims: The study of tidal disruption flares from galactic nuclei has historically been hampered by a lack of high quality spectral observations taken around the peak of the outburst. Here we introduce the first results from a program designed to identify tidal disruption events at their peak by making near-real-time comparisons of the flux see…
GOODS-Herschel: ultra-deep XMM-Newton observations reveal AGN/star-formation connection
Magnelli, B.; Altieri, B.; Aussel, H. +30 more
Models of galaxy evolution assume some connection between the AGN and star formation activity in galaxies. We use the multi-wavelength information of the CDFS to assess this issue. We select the AGNs from the 3 Ms XMM-Newton survey and measure the star-formation rates of their hosts using data that probe rest-frame wavelengths longward of 20 &micr…
Estimating turbulent velocities in the elliptical galaxies NGC 5044 and NGC 5813
Kaastra, J. S.; de Plaa, J.; Churazov, E. +5 more
Context. The interstellar and intra-cluster medium (ICM) in giant elliptical galaxies and clusters of galaxies is often assumed to be in hydrostatic equilibrium. Numerical simulations, however, show that about 5-30% of the pressure in a cluster is provided by turbulence induced by, for example, the central active galactic nucleus (AGN) and merger …
Multiwavelength campaign on Mrk 509. VIII. Location of the X-ray absorber
Kaastra, J. S.; Kriss, G. A.; Arav, N. +14 more
Aims: More than half of all active galactic nuclei show strong photoionised outflows. A major uncertainty in models for these outflows is the distance of the gas to the central black hole. We use the results of a massive multiwavelength monitoring campaign on the bright Seyfert 1 galaxy Mrk 509 to constrain the location of the outflow compone…
Orion revisited. I. The massive cluster in front of the Orion nebula cluster
Bouy, H.; Alves, J.
Aims: The aim of this work is to characterize the stellar population between Earth and the Orion A molecular cloud where the well-known star formation benchmark Orion nebula cluster (ONC) is embedded.
Methods: We used the denser regions the Orion A cloud to block optical background light, effectively isolating the stellar population in f…
XMM-Newton observation of 4U 1820-30. Broad band spectrum and the contribution of the cold interstellar medium
Waters, L. B. F. M.; Kaastra, J. S.; Costantini, E. +6 more
We present an analysis of the bright X-ray binary 4U 1820-30, thet is based mainly on XMM-Newton-RGS data, in addition to complementary data from XMM-Newton-EPIC-pn, INTEGRAL, and Chandra-HETG, to investigate different aspects of the source. The broad band continuum is fitted well by a classical combination of black body and Comptonized emission. …
Characterization of new hard X-ray cataclysmic variables
Mukai, K.; de Martino, D.; Masetti, N. +5 more
Aims: We aim at characterizing a sample of nine new hard X-ray selected cataclysmic variable (CVs), to unambiguously identify them as magnetic systems of the intermediate polar (IP) type.
Methods: We performed detailed timing and spectral analysis by using X-ray, and simultaneous UV and optical data collected by XMM-Newton, complemented …