Search Publications
Far-infrared-detected Lyman-break galaxies at z ~ 3. Dust attenuation and dust correction factors at high redshift
Cepa, J.; Oteo, I.; Ederoclite, A. +7 more
Lyman-break galaxies (LBGs) represent one of the kinds of star-forming galaxies that are found in the high-redshift universe. The detection of LBGs in the far-infrared (FIR) domain can provide very important clues on their dust attenuation and total star-formation rate (SFR), allowing a more detailed study than has been performed so far. In this w…
Discovery of a magnetic field in the CoRoT hybrid B-type pulsator HD 43317
Neiner, C.; Briquet, M.; Pápics, P. I. +2 more
Context. A promising way of testing the impact of a magnetic field on internal mixing (core overshooting, internal rotation) in main-sequence B-type stars is to perform asteroseismic studies of a sample of magnetic pulsators.
Aims: The CoRoT satellite revealed that the B3IV star HD 43317 is a hybrid SPB/β Cep-type pulsator that has a wealth o…
RX J0440.9 + 4431: a persistent Be/X-ray binary in outburst
Klochkov, D.; Ferrigno, C.; Bozzo, E. +3 more
The persistent Be/X-ray binary
Observing extended sources with the Herschel SPIRE Fourier Transform Spectrometer
Valtchanov, I.; Wu, R.; Hopwood, R. +20 more
The Spectral and Photometric Imaging Receiver (SPIRE) on the European Space Agency's Herschel Space Observatory utilizes a pioneering design for its imaging spectrometer in the form of a Fourier Transform Spectrometer (FTS). The standard FTS data reduction and calibration schemes are aimed at objects with either a spatial extent that is much large…
ιHorologi, the first coronal activity cycle in a young solar-like star
Sanz-Forcada, J.; Stelzer, B.; Metcalfe, T. S.
Context. The shortest chromospheric (Ca ii H&K) activity cycle (1.6 yr) has been recently discovered in the young (~600 Myr) solar-like star ι Hor. Coronal X-ray activity cycles have only been discovered in a few stars other than the Sun, all of them with an older age and a lower activity level than ι Hor.
Aims: We intended to find the X-…
Magnetic field strength distribution of magnetic bright points inferred from filtergrams and spectro-polarimetric data
Veronig, A.; Utz, D.; Hanslmeier, A. +3 more
Context. Small scale magnetic fields can be observed on the Sun in G-band filtergrams as magnetic bright points (MBPs) or identified in spectro-polarimetric measurements due to enhanced signals of Stokes profiles. These magnetic fields and their dynamics play a crucial role in understanding the coronal heating problem and also in surface dynamo mo…
Probing the role of polycyclic aromatic hydrocarbons in the photoelectric heating within photodissociation regions
Teyssier, D.; Ossenkopf, V.; Goicoechea, J. R. +8 more
Aims: We observationally investigate the relation between the photoelectric heating efficiency in photodissociation regions (PDRs) and the charge of polycyclic aromatic hydrocarbons (PAHs), which are considered to play a key role in photoelectric heating.
Methods: Using PACS onboard Herschel, we observed six PDRs spanning a wide range of…
GRO J1008-57: an (almost) predictable transient X-ray binary
Klochkov, D.; Wilms, J.; Ferrigno, C. +13 more
A study of archival RXTE, Swift, and Suzaku pointed observations of the transient high-mass X-ray binary GRO J1008-57 is presented. A new orbital ephemeris based on pulse arrival-timing shows the times of maximum luminosities during outbursts of GRO J1008-57 to be close to periastron at orbital phase - 0.03. This makes the source one of a few for …
Activity of the Seyfert galaxy neighbours
Georgantopoulos, I.; Chavushyan, V.; Plionis, M. +4 more
We present a follow-up study of a series of papers concerning the role of close interactions as a possible triggering mechanism of AGN activity. We have already studied the close (≤100 h-1 kpc) and the large-scale (≤1 h-1 Mpc) environment of a local sample of Sy1, Sy2, and bright IRAS galaxies (BIRG) and of their respective c…
Overview of semi-sinusoidal stellar variability with the CoRoT satellite
Baglin, A.; Catelan, M.; Janot-Pacheco, E. +13 more
Context. To date, the CoRoT space mission has produced more than 124 471 light curves. Classifying these curves in terms of unambiguous variability behavior is mandatory for obtaining an unbiased statistical view on their controlling root-causes.
Aims: The present study provides an overview of semi-sinusoidal light curves observed by the CoRo…