Search Publications
Spectral energy distribution modeling of broadband emission in the pulsar wind nebula 3C 58
An, Hongjun; Kim, Seungjong
We investigate the broadband emission properties of the pulsar wind nebula (PWN) 3C 58 using a spectral energy distribution (SED) model. We attempt to match simultaneously the broadband SED and spatial variations of X‑ray emission in the PWN. We further use the model to explain a possible far‑IR feature of which a hint was recently suggested in 3C…
Results from HOPS: A multiwavelength census of Orion protostars
Megeath, S. T.; Osorio, M.; Stanke, T. +7 more
Surveys with the Spitzer and Herschel space observatories are now enabling the discovery and characterization of large samples of protostars in nearby molecular clouds, providing the observational basis for a detailed understanding of star formation in diverse environments. We are pursuing this goal with the Herschel Orion Protostar Survey (HOPS),…
The opacity of spiral galaxy disks: IX. Dust and gas surface densities
Leroy, A.; Holwerda, B. W.; Allen, R. J. +4 more
Our aim is to explore the relation between gas, atomic and molecular, and dust in spiral galaxies. Gas surface densities are from atomic hydrogen and CO line emission maps. To estimate the dust content, we use the disk opacity as inferred from the number of distant galaxies identified in twelve HST/WFPC2 fields of ten nearby spiral galaxies. The o…
Growing evidence for a core formation threshold traced in Herschel Gould Belt survey clouds
André, Ph.; Arzoumanian, D.; Palmeirim, P. +3 more
It has already been suggested that a threshold in column density - or in visual extinction - may need to be exceeded to form dense cores and then protostars. Based on Herschel Gould Belt survey results in the Aquila and Orion B molecular cloud complexes we observe clear connection between the locations of the detected prestellar cores and their ba…
Debris disks as seen by Herschel/DUNES
Magain, P.; Krivov, A. V.; Eiroa, C. +18 more
The far-infrared excesses produced by debris disks are common features of stellar systems. These disks are thought to contain solids ranging from micron-sized dust to planetesimals. Naturally, their formation and evolution are linked to those of potential planets. With this motivation, the Herschel open time key programme DUNES (DUst around NEarby…
Water in star-forming regions with Herschel
van Dishoeck, E. F.; Kristensen, L. E.
The Herschel Space Observatory is well suited to address several important questions in star- and planet formation, as is evident from its first year of operation. This paper focuses on observations of water, a key molecule in the physics and chemistry of star-formation. In the WISH Key Program, a comprehensive set of water lines is being obtained…