Search Publications
H-ATLAS: PACS imaging for the Science Demonstration Phase
Rodighiero, G.; Ivison, R. J.; de Zotti, G. +26 more
We describe the reduction of data taken with the PACS instrument on board the Herschel Space Observatory in the Science Demonstration Phase of the Herschel-ATLAS (H-ATLAS) survey, specifically data obtained for a 4 × 4 deg2 region using Herschel's fast-scan (60arcsecs-1) parallel mode. We describe in detail a pipeline for dat…
Enceladus plume variability and the neutral gas densities in Saturn's magnetosphere
Johnson, R. E.; Mitchell, D. G.; Smith, H. T. +3 more
Neutral particle dominance over charged particles in Saturn's magnetosphere was evident prior to Cassini's arrival at Saturn in 2004. The observation of active plumes emanating from the south pole of Enceladus suggests that this small moon is likely to be the principal source of neutrals in Saturn's magnetosphere. Cassini has flown through the plu…
Detailed cluster mass and light profiles of A1703, A370 and RXJ1347-11 from deep Subaru imaging
Broadhurst, Tom; Oguri, Masamune; Umetsu, Keiichi +3 more
Weak lensing work can be badly compromised by unlensed foreground and cluster members which dilute the true lensing signal. We show how the lensing amplitude in multicolour space can be harnessed to securely separate cluster members from the foreground and background populations for three massive clusters, A1703 (z = 0.258), A370 (z = 0.375) and R…
Star Formation Signatures in Optically Quiescent Early-type Galaxies
Salim, Samir; Rich, R. Michael
In recent years, an argument has been made that a high fraction of early-type galaxies (ETGs) in the local universe experience low levels (lsim1 M sun yr-1) of star formation (SF) that causes strong excess in UV flux, yet leaves the optical colors red. Many of these studies were based on Galaxy Evolution Explorer imaging of S…
Modeling the Subsurface Structure of Sunspots
Strassmeier, K. G.; Thompson, M. J.; Komm, R. +19 more
While sunspots are easily observed at the solar surface, determining their subsurface structure is not trivial. There are two main hypotheses for the subsurface structure of sunspots: the monolithic model and the cluster model. Local helioseismology is the only means by which we can investigate subphotospheric structure. However, as current linear…
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…
The CHESS spectral survey of star forming regions: Peering into the protostellar shock L1157-B1. I. Shock chemical complexity
Falgarone, E.; Maret, S.; Codella, C. +66 more
We present the first results of the unbiased survey of the L1157-B1 bow shock, obtained with HIFI in the framework of the key program Chemical HErschel Survey of Star forming regions (CHESS). The L1157 outflow is driven by a low-mass Class 0 protostar and is considered the prototype of the so-called chemically active outflows. The bright blue-shif…
The fundamental plane of EDisCS galaxies. The effect of size evolution
Pelló, R.; White, S. D. M.; Poggianti, B. +15 more
We study the evolution of spectral early-type galaxies in clusters, groups, and the field up to redshift 0.9 using the ESO Distant Cluster Survey (EDisCS) dataset. We measure structural parameters (circularized half-luminosity radii Re, surface brightness Ie, and velocity dispersions σ) for 154 cluster and 68 field galaxies. …
Cold fronts in galaxy clusters
Rossetti, M.; Molendi, S.; Ghizzardi, S.
Context. Cold fronts have been observed in several galaxy clusters. Understanding their nature and origin is extremely important for investigating the internal dynamics of clusters.
Aims: To gain insight into the nature of these features, we carry out a statistical investigation of their occurrence in a sample of galaxy clusters observed with…
Asymmetry of the Ion Diffusion Region Hall Electric and Magnetic Fields during Guide Field Reconnection: Observations and Comparison with Simulations
Eastwood, J. P.; Phan, T. D.; Øieroset, M. +1 more
In situ measurements of magnetic reconnection in the Earth’s magnetotail are presented showing that even a moderate guide field (20% of the reconnecting field) considerably distorts ion diffusion region structure. The Hall magnetic and electric fields are asymmetric and shunted away from the current sheet; an appropriately scaled particle-in-cell …