Search Publications
A 158 µm [C II] Line Survey of Galaxies at z ~ 1-2: An Indicator of Star Formation in the Early Universe
Stacey, G. J.; Benford, D. J.; Staguhn, J. G. +5 more
We have detected the 158 µm [C II] line from 12 galaxies at z ~ 1-2. This is the first survey of this important star formation tracer at redshifts covering the epoch of maximum star formation in the universe and quadruples the number of reported high-z [C II] detections. The line is very luminous, between <0.024% and 0.65% of the far-infr…
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…
The spectral energy distribution of the central parsecs of the nearest AGN
Meisenheimer, K.; Tristram, K. R. W.; Prieto, M. A. +4 more
Spectral energy distributions (SEDs) of the central few tens of parsec region of some of the nearest, most well-studied, active galactic nuclei (AGN) are presented. These genuine AGN-core SEDs, mostly from Seyfert galaxies, are characterized by two main features: an infrared (IR) bump with the maximum in the 2-10µm range and an increasing X-…
A Multiwavelength Study of a Sample of 70 µm Selected Galaxies in the COSMOS Field. I. Spectral Energy Distributions and Luminosities
Aussel, H.; Le Floc'h, E.; Kartaltepe, Jeyhan S. +26 more
We present a large robust sample of 1503 reliable and unconfused 70 µm selected sources from the multiwavelength data set of the Cosmic Evolution Survey. Using the Spitzer IRAC and MIPS photometry, we estimate the total infrared (IR) luminosity, L IR (8-1000 µm), by finding the best-fit template from several different templa…
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…
Warm water vapour in the sooty outflow from a luminous carbon star
Ivison, R. J.; Blommaert, J. A. D. L.; Olofsson, G. +34 more
The detection of circumstellar water vapour around the ageing carbon star IRC +10216 challenged the current understanding of chemistry in old stars, because water was predicted to be almost absent in carbon-rich stars. Several explanations for the water were postulated, including the vaporization of icy bodies (comets or dwarf planets) in orbit ar…
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…