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Coplanar circumbinary debris discs
Wyatt, M. C.; Matthews, B. C.; Kennedy, G. M. +3 more
We present resolved Herschel images of circumbinary debris discs in the α CrB (HD 139006) and β Tri (HD13161) systems. By modelling their structure, we find that both discs are consistent with being aligned with the binary orbital planes. Though secular perturbations from the binary can bring the disc into alignment, in both cases the alignment ti…
The Earliest Phases of Star formation (EPoS) observed with Herschel: the dust temperature and density distributions of B68
Henning, Th.; Krause, O.; Balog, Z. +13 more
Context. Isolated starless cores within molecular clouds can be used as a testbed to investigate the conditions prior to the onset of fragmentation and gravitational proto-stellar collapse.
Aims: We aim to determine the distribution of the dust temperature and the density of the starless core B68.
Methods: In the framework of the Hersche…
A Detection of Weak-lensing Magnification Using Galaxy Sizes and Magnitudes
Koekemoer, Anton M.; Leauthaud, Alexie; Massey, Richard +5 more
Weak lensing is commonly measured using shear through galaxy ellipticities or using the effect of magnification bias on galaxy number densities. Here, we report on the first detection of weak-lensing magnification with a new, independent technique using the distribution of galaxy sizes and magnitudes. These data come for free in galaxy surveys des…
Dust coagulation processes as constrained by far-infrared observations
Abergel, A.; Bernard, J. -P.; Ristorcelli, I. +4 more
Aims: We develop a simple model of coagulated dust particles of two sizes (3.5 and 60 nm radius) to understand the nature and the effects of coagulation, which could explain the evolution of the far-infrared (FIR) dust opacity observed in the transition between the diffuse and the dense interstellar medium (ISM) (nH > 103
PHAT Stellar Cluster Survey. I. Year 1 Catalog and Integrated Photometry
Monachesi, Antonela; Gouliermis, Dimitrios A.; Dolphin, Andrew E. +21 more
The Panchromatic Hubble Andromeda Treasury (PHAT) survey is an ongoing Hubble Space Telescope (HST) multi-cycle program to obtain high spatial resolution imaging of one-third of the M31 disk at ultraviolet through near-infrared wavelengths. In this paper, we present the first installment of the PHAT stellar cluster catalog. When completed, the PHA…
On the physical structure of IRC +10216. Ground-based and Herschel observations of CO and C2H
Waters, L. B. F. M.; Barlow, M. J.; de Koter, A. +17 more
Context. The carbon-rich asymptotic giant branch star IRC +10 216 undergoes strong mass loss, and quasi-periodic enhancements of the density of the circumstellar matter have previously been reported. The star's circumstellar environment is a well-studied and complex astrochemical laboratory, in which many molecular species have been proved to be p…
Interstellar matter and star formation in W5-E. A Herschel view
Abergel, A.; Roussel, H.; André, Ph. +7 more
Aims: We identify the young stellar objects (YSOs) present in the vicinity of the W5-E H ii region, and study the influence of this H ii region on the star formation process in its surrounding molecular material.
Methods: W5-E has been observed with the Herschel-PACS and -SPIRE photometers, as part of the HOBYS key program; maps have bee…
"TNOs are Cool": A survey of the trans-Neptunian region. VI. Herschel/PACS observations and thermal modeling of 19 classical Kuiper belt objects
Fornasier, S.; Hartogh, P.; Lellouch, E. +20 more
Context. Trans-Neptunian objects (TNO) represent the leftovers of the formation of the solar system. Their physical properties provide constraints to the models of formation and evolution of the various dynamical classes of objects in the outer solar system.
Aims: Based on a sample of 19 classical TNOs we determine radiometric sizes, geometri…
Physical conditions in the gas phases of the giant H II region LMC-N 11 unveiled by Herschel . I. Diffuse [C II] and [O III] emission in LMC-N 11B
Poglitsch, A.; Sturm, E.; Lebouteiller, V. +10 more
Context. The Magellanic Clouds provide a nearby laboratory for metal-poor dwarf galaxies. The low dust abundance enhances the penetration of UV photons into the interstellar medium (ISM), resulting in a relatively larger filling factor of the ionized gas. Furthermore, there is very likely a molecular gas reservoir probed by the [C ii] 157 µm…
Secondary Magnetic Islands Generated by the Kelvin-Helmholtz Instability in a Reconnecting Current Sheet
Drake, J. F.; Swisdak, M.; Fermo, R. L.
Magnetic islands or flux ropes produced by magnetic reconnection have been observed on the magnetopause, in the magnetotail, and in coronal current sheets. Particle-in-cell simulations of magnetic reconnection with a guide field produce elongated electron current layers that spontaneously produce secondary islands. Here, we explore the seed mechan…