Search Publications
The evolution of the X-ray emission of HH 2. Investigating heating and cooling processes
Schmitt, J. H. M. M.; Günther, H. M.; Schneider, P. C.
Young stellar objects often drive powerful bipolar outflows, which evolve on timescales of a few years. An increasing number of these outflows has been detected in X-rays implying the existence of million degree plasma almost co-spatial with the lower temperature gas observed in the optical and near-infrared. The details of the heating and cooling…
On the nature of dust clouds in the region towards M 81 and NGC 3077
Heithausen, A.
Aims: There is some controversy on the nature of dust clouds found in direction of the interacting galaxy triplett M 81, M 82, and NGC 3077. Are they associated with the tidal arms seen in HI around those galaxies or are they simply Galactic foreground clouds?
Methods: Data from the SPIRE instrument onboard Herschel and MIPS onboard of S…
Active galaxy 4U 1344-60: did the relativistic line disappear?
Bianchi, S.; Guainazzi, M.; Piconcelli, E. +4 more
Context. X-ray bright active galactic nuclei represent a unique astrophysical laboratory for studying accretion physics around super-massive black holes.
Aims: 4U 1344-60 is a bright Seyfert galaxy which revealed relativistic reflection features in the archival XMM-Newton observation.
Methods: We present the spectroscopic results of new …
Matching microlensing events with X-ray sources
Treves, A.; Sartore, N.
Aims: The detection of old neutron stars and stellar mass black holes in isolation is one of the most sought after goals of compact object astrophysics. Microlensing surveys may help in achieving this aim because the lensing mechanism is independent of the emission properties of the lens. Several black hole candidates have indeed been detecte…
A background galaxy in the field of the β Pictoris debris disk
Ivison, R. J.; Fridlund, M.; Olofsson, G. +9 more
Herschel images in six photometric bands show the thermal emission of the debris disk surrounding
CO observations of water-maser post-asymptotic giant branch stars and detection of a high-velocity outflow in IRAS 15452-5459
Menten, K. M.; Cerrigone, L.; Kamiński, T.
Many aspects of the evolutionary phase in which asymptotic giant branch stars (AGB stars) are in transition to become planetary nebulae (PNe) remain poorly understood. An important question is how the circumstellar envelopes of AGB stars switch from spherical symmetry to the axially symmetric structures frequently observed in PNe. In many cases, t…
M31N 2008-05d: a M 31 disk nova with a dipping supersoft X-ray light curve
Della Valle, M.; Stiele, H.; Pietsch, W. +4 more
Context. Classical novae (CNe) represent a major class of supersoft X-ray sources (SSSs) in the central region of our neighbouring galaxy M 31. Significantly different SSS properties of CNe in the M 31 bulge and disk were indicated by recent X-ray population studies, which however considered only a small number of disk novae.
Aims: We initiat…
Seyfert's Sextet: where is the gas?
Wolter, A.; Tamburri, S.; Trinchieri, G. +3 more
Aims: Seyfert's Sextet (a.k.a HCG 79) is one of the most compact and isolated galaxy groups in the local Universe. It shows a prominent diffuse light component that accounts for ~50% of the total observed light. This likely indicates that the group is in an advanced evolutionary phase, which would predict a significant hot gaseous component. …
Constraints on the non-thermal emission from η Carinae's blast wave of 1843
Hinton, J. A.; Domainko, W.; Ohm, S. +3 more
Non-thermal hard X-ray and high-energy (HE; 1 MeV < E < 100 GeV) γ-ray emission in the direction of η Carinae has been recently detected using the INTEGRAL, AGILE and Fermi satellites. This emission has been interpreted either in the framework of particle acceleration in the colliding wind region between the two massive stars or in the very …
Multiple outflows from the luminous YSO IRAS 07422-2001
Varricatt, W. P.
The luminous young stellar object (YSO) IRAS 07422-2001 is studied in the infrared (IR). We discover star forming activity in embedded clusters located in a cloud detected at mid-IR wavelengths in emission. Multiple outflows are discovered from these clusters in the H2 ro-vibrational line at 2.122 µm. We detect at least six outflo…