Search Publications
Anatomy of the AGN in NGC 5548. VIII. XMM-Newton's EPIC detailed view of an unexpected variable multilayer absorber
Kaastra, J. S.; Harrison, F. A.; Kriss, G. A. +21 more
In 2013, we conducted a large multi-wavelength campaign on the archetypical Seyfert 1 galaxy NGC 5548. Unexpectedly, this usually unobscured source appeared strongly absorbed in the soft X-rays during the entire campaign, and signatures of new and strong outflows were present in the almost simultaneous UV HST/COS data. Here we carry out a comprehe…
A new model for the X-ray continuum of the magnetized accreting pulsars
Ferrigno, Carlo; Becker, Peter A.; Bozzo, Enrico +1 more
Context. Accreting highly magnetized pulsars in binary systems are among the brightest X-ray emitters in our Galaxy. Although a number of high-quality broad-band (0.1-100 keV) X-ray observations are available, the spectral energy distribution of these sources is usually investigated by adopting pure phenomenological models rather than models linke…
Origin of central abundances in the hot intra-cluster medium. I. Individual and average abundance ratios from XMM-Newton EPIC
Zhang, Y. -Y.; Kaastra, J. S.; Mernier, F. +5 more
The hot intra-cluster medium (ICM) is rich in metals, which are synthesised by supernovae (SNe) explosions and accumulate over time into the deep gravitational potential well of clusters of galaxies. Since most of the elements visible in X-rays are formed by type Ia (SNIa) and/or core-collapse (SNcc) supernovae, measuring their abundances gives us…
Origin of central abundances in the hot intra-cluster medium. II. Chemical enrichment and supernova yield models
Zhang, Y. -Y.; Kaastra, J. S.; Mernier, F. +7 more
The hot intra-cluster medium (ICM) is rich in metals, which are synthesised by supernovae (SNe) and accumulate over time into the deep gravitational potential well of clusters of galaxies. Since most of the elements visible in X-rays are formed by type Ia (SNIa) and/or core-collapse (SNcc) supernovae, measuring their abundances gives us direct inf…
Hard X-ray emission of the luminous infrared galaxy NGC 6240 as observed by NuSTAR
Harrison, F. A.; Stern, D.; Alexander, D. M. +23 more
We present a broadband (~0.3-70 keV) spectral and temporal analysis of NuSTAR observations of the luminous infrared galaxy NGC 6240 combined with archival Chandra, XMM-Newton, and BeppoSAX data. NGC 6240 is a galaxy in a relatively early merger state with two distinct nuclei separated by ~1.̋5. Previous Chandra observations resolved the two nuclei …
Evolution of the stellar-merger red nova V1309 Scorpii: Spectral energy distribution analysis
Tylenda, R.; Kamiński, T.
Context. One very important object for understanding the nature of red novae is V1309 Sco. Its pre-outburst observations showed that, before its red-nova eruption in 2008, it was a contact binary quickly evolving to the merger of the components. It thus provided us with a direct evidence that the red novae result from stellar mergers.
Aims: W…
Limits on the LyC signal from z ~ 3 sources with secure redshift and HST coverage in the E-CDFS field
Maccagni, D.; Giavalisco, M.; Thomas, R. +23 more
Context. Determining the strength of the Lyman continuum (LyC) and the fraction of LyC escape have implications for the properties of the emitting sources at any redshift, but also for the re-ionization of the Universe at z > 6.
Aims: We aim to measure the LyC signal from a sample of sources in the Chandra deep field south. We collect star…
Further ALMA observations and detailed modeling of the Red Rectangle
Sánchez Contreras, C.; Alcolea, J.; Santander-García, M. +3 more
Aims: We aim to study the rotating and expanding gas in the Red Rectangle, which is a well known bipolar nebula surrounding a double stellar system whose primary is a post-asymptotic giant branch (post-AGB) star. We analyze the properties of both components and the relation between them. Rotating disks have been very elusive in post-AGB nebul…
AGN feedback in the nucleus of M 51
Meidt, S. E.; Schinnerer, E.; Leroy, A. K. +10 more
AGN feedback is invoked as one of the most relevant mechanisms that shape the evolution of galaxies. Our goal is to understand the interplay between AGN feedback and the interstellar medium in M 51, a nearby spiral galaxy with a modest AGN and a kpc-scale radio jet expanding through the disc of the galaxy. For this purpose, we combine molecular ga…
Search for 511 keV emission in satellite galaxies of the Milky Way with INTEGRAL/SPI
Vincent, Aaron C.; Diehl, Roland; Siegert, Thomas +3 more
Context. The positron (e+) annihilation γ-ray signal in the Milky Way (MW) shows a puzzling morphology: a very bright bulge and a very low surface-brightness disk. A coherent explanation of the e+ origin, propagation through the Galaxy and subsequent annihilation in the interstellar medium has not yet been found. Tentative ex…