Search Publications
Tidal streams around galaxies in the SDSS DR7 archive. I. First results
Bomans, D. J.; Dettmar, R. -J.; Miskolczi, A.
Context. Models of hierarchical structure formation predict the accretion of smaller satellite galaxies onto more massive systems and this process should be accompanied by a disintegration of the smaller companions visible, e.g., in tidal streams.
Aims: In order to verify and quantify this scenario we have developed a search strategy for low …
First simultaneous multi-wavelength observations of the black hole candidate IGR J17091-3624. ATCA, INTEGRAL, Swift, and RXTE views of the 2011 outburst
Tomsick, J. A.; Rodriguez, J.; Cadolle Bel, M. +5 more
We present the results of the first four (quasi-)simultaneous radio (ATCA), X-ray (Swift, RXTE), and γ-ray (INTEGRAL) observations of the black hole candidate IGR J17091-3624, performed in February and March 2011. The X-ray analysis shows that the source was in the hard state, and then it transited to a soft intermediate state. We study the correl…
The spectroscopic evolution of the symbiotic-like recurrent nova V407 Cygni during its 2010 outburst. I. The shock and its evolution
Shore, S. N.; Wahlgren, G. M.; Osborne, J. P. +7 more
Context. V407 Cyg was, before 2010 Mar., known only as a D-type symbiotic binary system in which the Mira variable has a pulsation period of approximately 750 days, one of the longest known. On 2010 Mar. 10, it was discovered in outburst, eventually reaching V < 8. This is the first recorded nova event for this system, but it closely resembles …
Dust formation in the ejecta of the type II-P supernova 2004dj
Balog, Z.; Kiss, L. L.; Vinkó, J. +3 more
Aims: Core-collapse supernovae (CC SNe), especially type II-Plateau ones, are thought to be important contributors to cosmic dust production. SN 2004dj, one of the closest and brightest SN since 1987A, offered a good opportunity to examine dust-formation processes. To find signs of newly formed dust, we analyze all available mid-infrared (MIR…
Distance determination for RAVE stars using stellar models. III. The nature of the RAVE survey and Milky Way chemistry
Gilmore, G.; Freeman, K. C.; Munari, U. +19 more
We apply the method of Burnett & Binney (2010, MNRAS, 407, 339) for the determination of stellar distances and parameters to the internal catalogue of the RAdial Velocity Experiment (RAVE; Steinmetz et al. 2006, AJ, 132, 1645). Subsamples of stars that either have Hipparcos parallaxes or belong to well-studied clusters inspire confidence in th…
Titan's obliquity as evidence of a subsurface ocean?
Karatekin, Ö.; Baland, R. -M.; van Hoolst, T. +1 more
On the basis of gravity and radar observations with the Cassini spacecraft, the moment of inertia of Titan and the orientation of Titan's rotation axis have been estimated in recent studies. According to the observed orientation, Titan is close to the Cassini state. However, the observed obliquity is inconsistent with the estimate of the moment of…
MHD wave transmission in the Sun's atmosphere
Berrilli, F.; Del Moro, D.; Stangalini, M. +1 more
Magnetohydrodynamics (MHD) wave propagation inside the Sun's atmosphere is closely related to the magnetic field topology. For example, magnetic fields are able to lower the cutoff frequency for acoustic waves, thus allowing the propagation of waves that would otherwise be trapped below the photosphere into the upper atmosphere. In addition, MHD w…
Ensemble X-ray variability of active galactic nuclei from serendipitous source catalogues
Trevese, D.; Vagnetti, F.; Turriziani, S.
Context. The X-ray variability of the active galactic nuclei (AGN) has been most often investigated with studies of individual, nearby sources, and only a few ensemble analyses have been applied to large samples in wide ranges of luminosity and redshift.
Aims: We aim to determine the ensemble variability properties of two serendipitously sele…
New insight into the formation of hexamethylenetetramine (HMT) in interstellar and cometary ice analogs
Vinogradoff, V.; Duvernay, F.; Danger, G. +2 more
Aims: We investigate the purely thermal formation of hexamethylenetetramine (HMT, C6H12N4) in interstellar ice analogs from non-photolysed ice and compare our results with those for the formation from photolysed ice.
Methods: We use Fourier transform-infrared spectroscopy to follow residue formation from …
The effect of environment on star forming galaxies at redshift. I. First insight from PACS
Berta, S.; Magnelli, B.; Nordon, R. +33 more
We use deep 70, 100 and 160 µm observations taken with PACS, the Photodetector Array Camera and Spectrometer on board of Herschel, as part of the PACS Evolutionary Probe (PEP) guaranteed time, to study the relation between star formation rate and environment at redshift ~ 1 in the GOODS-S and GOODS-N fields. We use the SDSS spectroscopic cat…