Search Publications
The seeds of star formation in the filamentary infrared-dark cloud G011.11-0.12
Henning, Th.; Krause, O.; Beuther, H. +5 more
Context. Infrared-dark clouds (IRDCs) are the precursors to massive stars and stellar clusters. G011.11-0.12 is a well-studied filamentary IRDC, though, to date, the absence of far-infrared data with sufficient spatial resolution has limited the understanding of the structure and star-formation activity.
Aims: We use Herschel to study the emb…
Resolving debris discs in the far-infrared: Early highlights from the DEBRIS survey
Ivison, R. J.; Duchêne, G.; Dent, W. R. F. +29 more
We present results from the earliest observations of DEBRIS, a Herschel key programme to conduct a volume- and flux-limited survey for debris discs in A-type through M-type stars. PACS images (from chop/nod or scan-mode observations) at 100 and 160 µm are presented toward two A-type stars and one F-type star: β Leo, β UMa and η Corvi. All th…
A Herschel study of the properties of starless cores in the Polaris Flare dark cloud region using PACS and SPIRE
Olofsson, G.; Abergel, A.; Könyves, V. +32 more
The Polaris Flare cloud region contains a great deal of extended emission. It is at high declination and high Galactic latitude. It was previously seen strongly in IRAS Cirrus emission at 100 microns. We have detected it with both PACS and SPIRE on Herschel. We see filamentary and low-level structure. We identify the five densest cores within this…
The star-formation rates of 1.5 < z < 2.5 massive galaxies
Berta, S.; Magnelli, B.; Nordon, R. +31 more
The star formation rate (SFR) is a key parameter in the study of galaxy evolution. The accuracy of SFR measurements at z ~ 2 has been questioned following a disagreement between observations and theoretical models. The latter predict SFRs at this redshift that are typically a factor 4 or more lower than the measurements. We present star-formation …
Star formation triggered by the Galactic H II region RCW 120. First results from the Herschel Space Observatory
Abergel, A.; Hill, T.; White, G. J. +10 more
Context. By means of different physical mechanisms, the expansion of H ii regions can promote the formation of new stars of all masses. RCW 120 is a nearby Galactic H ii region where triggered star formation occurs. This region is well-studied - there being a wealth of existing data - and is nearby. However, it is surrounded by dense regions for w…
Coronal properties of planet-bearing stars
Schmitt, J. H. M. M.; Robrade, J.; Poppenhaeger, K.
Context. Do extrasolar planets affect the activity of their host stars? Indications for chromospheric activity enhancement have been found for a handful of targets, but in the X-ray regime, conclusive observational evidence is still missing.
Aims: We want to establish a sound observational basis to confirm or reject major effects of Star-Plan…
Origin of the hot gas in low-mass protostars. Herschel-PACS spectroscopy of HH 46
de Graauw, Th.; Murphy, J. A.; Liseau, R. +62 more
Aims: “Water In Star-forming regions with Herschel” (WISH) is a Herschel key programme aimed at understanding the physical and chemical structure of young stellar objects (YSOs) with a focus on water and related species.
Methods: The low-mass protostar HH 46 was observed with the Photodetector Array Camera and Spectrometer (PACS) on the …
Properties of starspots on CoRoT-2
Alonso, R.; Barge, P.; Lanza, A. F. +1 more
Context. As a planet eclipses its parent star, a dark spot on the surface of the star may be occulted, causing a detectable variation in the light curve.
Aims: We study these light curve variations during transits and infer the physical characteristics of the stellar spots.
Methods: A total of 77 consecutive transit light curves of CoRoT…
VLT-VIMOS integral field spectroscopy of luminous and ultraluminous infrared galaxies. II. Evidence for shock ionization caused by tidal forces in the extra-nuclear regions of interacting and merging LIRGs
Colina, L.; Monreal-Ibero, A.; Arribas, S. +3 more
Context. Luminous infrared galaxies (LIRGs) are an important class of objects in the low-z universe bridging the gap between normal spirals and the strongly interacting and starbursting ultraluminous infrared galaxies (ULIRGs). Since a large fraction of the stars in the Universe have been formed in these objects, LIRGs are also relevant in a high-…
Herschel spectral surveys of star-forming regions. Overview of the 555-636 GHz range
Falgarone, E.; Maret, S.; Liseau, R. +63 more
High resolution line spectra of star-forming regions are mines of information: they provide unique clues to reconstruct the chemical, dynamical, and physical structure of the observed source. We present the first results from the Herschel key project “Chemical HErschel Surveys of Star forming regions”, CHESS. We report and discuss observations tow…