Search Publications
Hierarchical fragmentation and collapse signatures in a high-mass starless region
Henning, Th.; Beuther, H.; Kuiper, R. +6 more
Aims: We study the fragmentation and collapse properties of the dense gas during the onset of high-mass star formation.
Methods: We observed the massive (~800 M⊙) starless gas clump IRDC 18310-4 with the Plateau de Bure Interferometer (PdBI) at subarcsecond resolution in the 1.07 mm continuum and N2H+(3-2…
Super-solar metallicity at the position of the ultra-long GRB 130925A
Greiner, J.; Klose, S.; Schady, P. +18 more
Over the last decade there has been immense progress in the follow-up of short and long gamma-ray bursts (GRBs), resulting in a significant rise in the detection rate of X-ray and optical afterglows, in the determination of GRB redshifts, and of the identification of the underlying host galaxies. Nevertheless, our theoretical understanding of the …
XMM-Newton study of 30 Doradus C and a newly identified MCSNR J0536-6913 in the Large Magellanic Cloud⋆
Haberl, F.; Filipović, M. D.; Maggi, P. +4 more
Aims: We present a detailed study of the superbubble 30 Dor C and the newly identified supernova remnant MCSNR J0536-6913 in the Large Magellanic Cloud.
Methods: All available XMM-Newton data (flare-filtered exposure times of 420 ks EPIC-pn, 556 ks EPIC-MOS1, 614 ks EPIC-MOS2) were used to characterise the thermal X-ray emission in the r…
The role of the Fraunhofer lines in solar brightness variability
Solanki, S. K.; Shapiro, A. I.; Tagirov, R. V. +2 more
Context. The solar brightness varies on timescales from minutes to decades. A clear identification of the physical processes behind such variations is needed for developing and improving physics-based models of solar brightness variability and reconstructing solar brightness in the past. This is, in turn, important for better understanding the sol…
Variability-selected active galactic nuclei in the VST-SUDARE/VOICE survey of the COSMOS field
Salvato, M.; Brandt, W. N.; Vaccari, M. +16 more
Context. Active galaxies are characterized by variability at every wavelength, with timescales from hours to years depending on the observing window. Optical variability has proven to be an effective way of detecting AGNs in imaging surveys, lasting from weeks to years.
Aims: In the present work we test the use of optical variability as a too…
Star-formation histories of local luminous infrared galaxies
Pérez-González, Pablo G.; Arribas, Santiago; Colina, Luis +7 more
We present analysis of the integrated spectral energy distribution (SED) from the ultraviolet (UV) to the far-infrared and Hα of a sample of 29 local systems and individual galaxies with infrared (IR) luminosities between 1011L⊙ and 1011.8L⊙. We combined new narrow-band Hα + [N ii] and broad-band g, r op…
Hydrogen Ly-α and Ly-β full Sun line profiles observed with SUMER/SOHO (1996-2009)
Vial, J. -C.; Wilhelm, K.; Curdt, W. +2 more
Context. Accurate hydrogen spectra emitted by the entire solar disc in the Ly-α and Ly-βlines are valuable for deriving the distribution and the behaviour of atomic hydrogen in the heliosphere, for understanding the UV emissions of solar type stars better, and finally for estimating the solar energy input that mainly initiates the chemical process…
Interplay between heartbeat oscillations and wind outflow in microquasar IGR J17091-3624
Bianchi, Stefano; Janiuk, Agnieszka; Capitanio, Fiamma +1 more
Aims: During the bright outburst in 2011, the black hole candidate IGR J17091-3624 exhibited strong quasi-periodic flare-like events (on timescales of tens of seconds) in some characteristic states, the so-called heartbeat state. From the theoretical point of view, these oscillations may be modeled by the process of accretion disk instability…
Infrared emission of young HII regions: a Herschel/Hi-GAL study
Smith, M. D.; Testi, L.; Molinari, S. +7 more
Context. Investigating the relationship between radio and infrared emission of Hii regions may help shed light on the nature of the ionizing stars and the formation mechanism of early-type stars in general.
Aims: We have taken advantage of recent unbiased surveys of the Galactic plane such as Herschel/Hi-GAL and VLA/CORNISH to study a bona fi…
Dusty wind of W Hydrae. Multi-wavelength modelling of the present-day and recent mass loss
Waters, L. B. F. M.; de Koter, A.; Decin, L. +5 more
Context. Low- and intermediate-mass stars go through a period of intense mass-loss at the end of their lives, during the asymptotic giant branch (AGB) phase. While on the AGB a significant part, or even most, of their initial mass is expelled in a stellar wind. This process controls the final stages of the evolution of these stars and contributes …