Search Publications
A Herschel PACS and SPIRE study of the dust content of the Cassiopeia A supernova remnant
Ivison, R. J.; Olofsson, G.; Henning, Th. +13 more
Using the 3.5-m Herschel Space Observatory, imaging photometry of Cas A has been obtained in six bands between 70 and 500 µm with the PACS and SPIRE instruments, with angular resolutions ranging from 6 to 37”. In the outer regions of the remnant the 70-µm PACS image resembles the 24-µm image Spitzer image, with the emission attri…
The Crab Nebula as a standard candle in very high-energy astrophysics
Horns, D.; Meyer, M.; Zechlin, H. -S.
The continuum high-energy gamma-ray emission between 1 GeV and 105 GeV from the Crab Nebula has been measured for the first time in overlapping energy bands by the Fermi large-area telescope (Fermi/LAT) below ≈100 GeV and by ground-based imaging air Cherenkov telescopes (IACTs) above ≈60 GeV. To follow up on the phenomenological approac…
Exploring the physical properties of local star-forming ULIRGs from the ultraviolet to the infrared
Elbaz, D.; Armus, L.; da Cunha, E. +3 more
We apply the da Cunha et al. (2008, MNRAS, 388, 1595) model of the spectral energy distribution (SEDs) of galaxies to a small pilot sample of purely star-forming ultra-luminous infrared galaxies (ULIRGs). We interpret the observed SEDs of 16 ULIRGs using this physically-motivated model that accounts for both the emission of stellar populations fro…
Water cooling of shocks in protostellar outflows. Herschel-PACS map of L1157
de Graauw, Th.; Liseau, R.; Braine, J. +62 more
Context. The far-IR/sub-mm spectral mapping facility provided by the Herschel-PACS and HIFI instruments has made it possible to obtain, for the first time, images of H2O emission with a spatial resolution comparable to ground based mm/sub-mm observations.
Aims: In the framework of the Water In Star-forming regions with Herschel (WI…
The solar type protostar IRAS16293-2422: new constraints on the physical structure
Maret, S.; Ceccarelli, C.; Lis, D. C. +5 more
Context. The low mass protostar IRAS16293-2422 is a prototype Class 0 source in studies of the chemical structure during the initial phases of life of solar type stars.
Aims: To derive the chemical structure accurately, a precise determination of the source physical structure is required. The goal of this study is to derive the structure of I…
Radiolysis of ammonia-containing ices by energetic, heavy, and highly charged ions inside dense astrophysical environments
Pilling, S.; Seperuelo Duarte, E.; da Silveira, E. F. +4 more
Deep inside dense molecular clouds and protostellar disks, interstellar ices are protected from stellar energetic UV photons. However, X-rays and energetic cosmic rays can penetrate inside these regions triggering chemical reactions, molecular dissociation, and evaporation processes. We present experimental studies of the interaction of heavy, hig…
Dust-temperature of an isolated star-forming cloud: Herschel observations of the Bok globule CB244
Henning, T.; Krause, O.; André, P. +6 more
We present Herschel observations of the isolated, low-mass star-forming Bok globule CB244. It contains two cold sources, a low-mass Class 0 protostar and a starless core, which is likely to be prestellar in nature, separated by 90" (~18 000 AU). The Herschel data sample the peak of the Planck spectrum for these sources, and are therefore ideal for…
Radiolysis of H2O:CO2 ices by heavy energetic cosmic ray analogs
Pilling, S.; Seperuelo Duarte, E.; da Silveira, E. F. +3 more
An experimental study of the interaction of heavy, highly charged, and energetic ions (52 MeV 58Ni13+) with pure H2O, pure CO2 and mixed H2O:CO2 astrophysical ice analogs is presented. This analysis aims to simulate the chemical and the physicochemical interactions induced by heavy …
The dust morphology of the elliptical Galaxy M 86 with SPIRE
Elbaz, D.; Bock, J. J.; Clements, D. L. +58 more
We present Herschel-SPIRE observations at 250-500 µm of the giant elliptical galaxy M 86 and examine the distribution of the resolved cold dust emission and its relation with other galactic tracers. The SPIRE images reveal three dust components: emission from the central region; a dust lane extending north-south; and a bright emission featur…
Herschel-PACS spectroscopy of IR-bright galaxies at high redshift
Lutz, D.; Genzel, R.; Poglitsch, A. +11 more
We present Herschel-PACS observations of rest-frame mid-infrared and far-infrared spectral line emissions from two lensed, ultra-luminous infrared galaxies at high redshift: MIPS J142824.0+352619 (MIPS J1428), a starburst-dominated system at z = 1.3, and IRAS F10214+4724 (F10214), a source at z = 2.3 hosting both star-formation and a luminous AGN.…