Search Publications
Discovery of O VII line emitting gas in elliptical galaxies
Fabian, Andrew C.; Sanders, Jeremy S.; Finoguenov, Alexis +7 more
In the cores of ellipticals, clusters, and groups of galaxies, the gas has a cooling time shorter than 1 Gyr. It is possible to probe cooling flows through the detection of Fe XVII and O VII emission lines, but so far O VII has not been detected in any individual object. The Reflection Grating Spectrometers (RGS) aboard XMM-Newton are currently th…
The problematically short superwind of OH/IR stars. Probing the outflow with the 69 µm spectral band of forsterite
Waters, L. B. F. M.; Blommaert, J. A. D. L.; Min, M. +4 more
Aims: Spectra of OH/IR stars show prominent spectral bands of crystalline olivine (Mg(2 - 2x)Fe(2x)SiO4). To learn more about the timescale of the outflows of OH/IR stars, we study the spectral band of crystalline olivine at 69 µm.
Methods: The 69 µm band is of interest because its width and p…
Herschel observations of gamma-ray burst host galaxies: implications for the topology of the dusty interstellar medium
Palazzi, E.; Greiner, J.; Hunt, L. K. +11 more
Long-duration gamma-ray bursts (GRBs) are indisputably related to star formation, and their vast luminosity in gamma rays pin-points regions of star formation independent of galaxy mass, out to the epoch of re-ionisation. As such, GRBs provide a unique tool for studying star forming galaxies out to high-z independent of luminosity. Most of our und…
ALMA-backed NIR high resolution integral field spectroscopy of the NUGA galaxy NGC 1433
Eckart, Andreas; García-Marín, Macarena; Combes, Françoise +7 more
Aims: We present the results of near-infrared (NIR) H- and K-band European Southern Observatory SINFONI integral field spectroscopy (IFS) of the Seyfert 2 galaxy
GW Orionis: Inner disk readjustments in a triple system
Eiroa, C.; Fedele, D.; Henning, Th. +4 more
Context. Disks are expected to dissipate quickly in binary or multiple systems. Investigating such systems can improve our knowledge of the disk dispersal. The triple system GW Ori, still harboring a massive disk, is an excellent target.
Aims: We study the young stellar system GW Ori, concentrating on its accretion, wind activity and disk pro…
A new sample of X-ray selected narrow emission-line galaxies. I. The nature of optically elusive AGN
Watson, M. G.; Pons, E.
Using the 3XMM catalogue of serendipitous X-ray sources, and the SDSS-DR9 spectroscopic catalogue, we have obtained a new sample of X-ray selected narrow emission line galaxies. The standard optical diagnostic diagram and selection by hard X-ray luminosity expose a mismatch between the optically-based and X-ray-based classifications. The nature of…
Multiwavelength campaign on Mrk 509. XIII. Testing ionized-reflection models on Mrk 509
Kaastra, J. S.; Kriss, G. A.; Arav, N. +12 more
Active galactic nuclei (AGN) are the most luminous persistent objects in the universe. The X-ray domain is particularly important because the X-ray flux represents a significant fraction of the bolometric emission from such objects and probes the innermost regions of accretion disks, where most of this power is generated. An excess of X-ray emissi…
Soft X-ray characterisation of the long-term properties of supergiant fast X-ray transients
Esposito, P.; Ducci, L.; Romano, P. +3 more
Context. Supergiant fast X-ray transients (SFXTs) are high mass X-ray binaries (HMXBs) that are characterised by a hard X-ray (≥ 15 keV) flaring behaviour. These flares reach peak luminosities of 1036-1037 erg s-1 and last a few hours in the hard X-rays.
Aims: We investigate the long-term properties of SFXTs b…
The detached dust shells around the carbon AGB stars R Sculptoris and V644 Scorpii
Olofsson, G.; Maercker, M.; Leal-Ferreira, M. L. +2 more
Context. The morphology of the circumstellar envelopes (CSE) around asymptotic giant branch (AGB) stars gives information on the mass-loss process from the star, its evolution and wind, and on the effect of binary interaction. However, determining the distribution of dust in the circumstellar envelopes is difficult. Observations of polarised, dust…
Scaling relations of cluster elliptical galaxies at z~ 1.3. Distinguishing luminosity and structural evolution
Poggianti, B. M.; Boutsia, K.; Fumana, M. +10 more
Context. We studied the size-surface brightness and the size-mass relations of a sample of 16 cluster elliptical galaxies in the mass range ~ 1010-2 × 1011 M⊙, which were morphologically selected in the cluster RDCS J0848+4453 at z = 1.27.
Aims: Our aim is to assess whether they have completed their mass growt…