Search Publications
In-orbit performance of Herschel-HIFI
de Graauw, Th.; Braine, J.; Martín-Pintado, J. +96 more
Aims: In this paper the calibration and in-orbit performance of the Heterodyne Instrument for the Far-Infrared (HIFI) is described.
Methods: The calibration of HIFI is based on a combination of ground and in-flight tests. Dedicated ground tests to determine those instrument parameters that can only be measured accurately using controlled…
The Galactic WC stars. Stellar parameters from spectral analyses indicate a new evolutionary sequence
Sander, A.; Hamann, W. -R.; Todt, H.
Context. The life cycles of massive stars from the main sequence to their explosion as supernovae or gamma ray bursts are not yet fully clear, and the empirical results from spectral analyses are partly in conflict with current evolutionary models. The spectral analysis of Wolf-Rayet stars requires the detailed modeling of expanding stellar atmosp…
Simultaneous Planck, Swift, and Fermi observations of X-ray and γ-ray selected blazars
Tagliaferri, G.; Bonaldi, A.; Bonavera, L. +92 more
We present simultaneous Planck, Swift, Fermi, and ground-based data for 105 blazars belonging to three samples with flux limits in the soft X-ray, hard X-ray, and γ-ray bands, with additional 5GHz flux-density limits to ensure a good probability of a Planck detection. We compare our results to those of a companion paper presenting simultaneous Pla…
A chemical model for the atmosphere of hot Jupiters
Agúndez, M.; Hersant, F.; Dobrijevic, M. +5 more
Context. The atmosphere of hot Jupiters can be probed by primary transit and secondary eclipse spectroscopy. Owing to the intense UV irradiation, mixing, and circulation, their chemical composition is maintained out of equilibrium and must be modeled with kinetic models.
Aims: Our purpose is to release a chemical network and the associated ra…
X-ray variability of 104 active galactic nuclei. XMM-Newton power-spectrum density profiles
Vaughan, S.; González-Martín, O.
Context. Active galactic nuclei (AGN), powered by accretion onto supermassive black holes (SMBHs), are thought to be scaled up versions of Galactic black hole X-ray binaries (BH-XRBs). In the past few years evidence of such correspondence include similarities in the broadband shape of the X-ray variability power spectra, with characteristic bend t…
Enhanced star formation rates in AGN hosts with respect to inactive galaxies from PEP-Herschel observations
Berta, S.; Magnelli, B.; Nordon, R. +35 more
We compare the average star formation (SF) activity in X-ray selected AGN hosts with a mass-matched control sample of inactive galaxies, including both star forming and quiescent sources, in the 0.5 < z < 2.5 redshift range. Recent observations carried out by PACS, the 60-210 µm photometric camera on board the Herschel Space Observator…
A far-infrared survey of bow shocks and detached shells around AGB stars and red supergiants
Blommaert, J. A. D. L.; Jorissen, A.; Ottensamer, R. +16 more
Aims: Our goal is to study the different morphologies associated to the interaction of the stellar winds of AGB stars and red supergiants with the interstellar medium (ISM) to follow the fate of the circumstellar matter injected into the interstellar medium.
Methods: Far-infrared Herschel/PACS images at 70 and 160 µm of a sample of…
The dust scaling relations of the Herschel Reference Survey
Clements, D. L.; Ciesla, L.; Boquien, M. +23 more
We combine new Herschel/SPIRE sub-millimeter observations with existing multiwavelength data to investigate the dust scaling relations of the Herschel Reference Survey, a magnitude-, volume-limited sample of ~300 nearby galaxies in different environments. We show that the dust-to-stellar mass ratio anti-correlates with stellar mass, stellar mass s…
HerMES: deep number counts at 250 µm, 350 µm and 500 µm in the COSMOS and GOODS-N fields and the build-up of the cosmic infrared background
Berta, S.; Aussel, H.; Le Floc'h, E. +58 more
Aims: The Spectral and Photometric Imaging REceiver (SPIRE) onboard the Herschel space telescope has provided confusion limited maps of deep fields at 250 µm, 350 µm, and 500 µm, as part of the Herschel Multi-tiered Extragalactic Survey (HerMES). Unfortunately, due to confusion, only a small fraction of the cosmic infrared b…
The spine of the swan: a Herschel study of the DR21 ridge and filaments in Cygnus X
Martin, P. G.; Hill, T.; White, G. J. +31 more
In order to characterise the cloud structures responsible for the formation of high-mass stars, we present Herschel observations of the DR21 environment. Maps of the column density and dust temperature unveil the structure of the DR21 ridge and several connected filaments. The ridge has column densities higher than 1023 cm-2 …