Search Publications
Analogs of solid nanoparticles as precursors of aromatic hydrocarbons
Mutschke, H.; Jäger, C.; Gadallah, K. A. K.
Context. Aromatic =CH and C=C vibrational bands have been observed within shocked interstellar regions, indicating the presence of aromatic emission carriers such as PAHs, which may have been created from adjacent molecular cloud material by interaction with a shock front.
Aims: We investigate the evolution of the aromatic =CH and C=C vibrati…
Fundamental vibrational transitions of hydrogen chloride detected in CRL 2136
Menten, K. M.; Neufeld, D. A.; Geballe, T. R. +3 more
Aims: We would like to understand the chemistry of dense clouds and their hot cores more quantitatively by obtaining more complete knowledge of the chemical species present in them.
Methods: We have obtained high-resolution infrared absorption spectroscopy at 3-4 µm toward the bright infrared source CRL 2136.
Results: The fund…
The HIFI spectral survey of AFGL 2591 (CHESS). I. Highly excited linear rotor molecules in the high-mass protostellar envelope
Ceccarelli, C.; Pagani, L.; van der Tak, F. F. S. +2 more
Context. Linear rotor molecules such as CO, HCO+ and HCN are important probes of star-forming gas. For these species, temperatures of ≲ 50 K are sufficient to produce emission lines that are observable from the ground at (sub)millimeter wavelengths. Molecular gas in the environment of massive protostellar objects, however, is known to r…
A massive parsec-scale dust ring nebula around the yellow hypergiant Hen 3-1379
Hutsemékers, D.; Cox, N. L. J.; Vamvatira-Nakou, C.
On the basis of far-infrared images obtained by the Herschel Space Observatory, we report the discovery of a large and massive dust shell around the yellow hypergiant Hen 3-1379. The nebula appears as a detached ring of 1 pc diameter which contains 0.17 M⊙ of dust. We estimate the total gas mass to be 7 M⊙, ejected some 1.6 ×…
Swift/XRT orbital monitoring of the candidate supergiant fast X-ray transient IGR J17354-3255
Esposito, P.; Ducci, L.; Romano, P. +5 more
We report on the Swift/X-ray Telescope (XRT) monitoring of the field of view around the candidate supergiant fast X-ray transient (SFXT) IGR J17354-3255, which is positionally associated with the AGILE/GRID gamma-ray transient AGL J1734-3310. Our observations, which cover 11 days for a total on-source exposure of ~24 ks, span 1.2 orbital periods (…
Long-term evolution of the neutron-star spin period of SXP 1062
Haberl, F.; Udalski, A.; Gallagher, J. S. +4 more
Context. The Be/X-ray binary SXP 1062 is of especial interest owing to the large spin period of the neutron star, its large spin-down rate, and the association with a supernova remnant constraining its age. This makes the source an important probe for accretion physics.
Aims: To investigate the long-term evolution of the spin period and assoc…
X-ray irradiation and mass-loss of the hot Jupiter WASP-43b
Schmitt, J. H. M. M.; Czesla, S.; Salz, M. +1 more
We report the X-ray detection of the low-mass K7V star WASP-43, which is orbited by a hot Jupiter in one of the closest exoplanet orbits known to date. The high mean density of the planet implies a massive core with ≈130 M⊕, yielding a heavy-element mass-fraction of 20%. From an 18 ks long XMM-Newton observation, we derive an X-ray lumi…
Coronal magnetic field strength from Type II radio emission: complementarity with Faraday rotation measurements
Mancuso, S.; Garzelli, M. V.
We analyzed the band splitting of a Type II radio burst observed on 1997 May 12 by ground- and space-based radio spectrometers. Type II radio emission is the most evident signature of coronal shock waves and the observed band splitting is generally interpreted as due to plasma emission from both upstream and downstream shock regions. From the infe…
New companions in the stellar systems of DI Cha, Sz 22, CHXR 32, and Cha Hα 5 in the Chamaeleon I star-forming region
Neuhäuser, R.; Schmidt, T. O. B.; Vogt, N. +2 more
Context. The star-forming regions in Chamaeleon (Cha) are among the nearest (distance ~165 pc) and youngest (age ~2 Myr) conglomerates of recently formed stars and among the ideal targets for studies of star formation.
Aims: We search for new, hitherto unknown binary or multiple-star components and investigate their membership in Cha and thei…
Probing the evolution of the substructure frequency in galaxy clusters up to z ~ 1
Böhringer, H.; Chon, G.; Weißmann, A.
Context. Galaxy clusters are the last and largest objects to form in the standard hierarchical structure formation scenario through merging of smaller systems. The substructure frequency in the past and present epoch provides excellent means for studying the underlying cosmological model.
Aims: Using X-ray observations, we study the substruct…