Search Publications
CLASH: New Multiple Images Constraining the Inner Mass Profile of MACS J1206.2-0847
Infante, L.; Zheng, W.; Molino, A. +45 more
We present a strong-lensing analysis of the galaxy cluster MACS J1206.2-0847 (z = 0.44) using UV, Optical, and IR, HST/ACS/WFC3 data taken as part of the CLASH multi-cycle treasury program, with VLT/VIMOS spectroscopy for some of the multiply lensed arcs. The CLASH observations, combined with our mass model, allow us to identify 47 new multiply le…
The Nature of Extremely Red H - [4.5] > 4 Galaxies Revealed with SEDS and CANDELS
Dickinson, M.; Ferguson, H. C.; Giavalisco, M. +20 more
We have analyzed a sample of 25 extremely red H - [4.5] > 4 galaxies, selected using 4.5 µm data from the Spitzer SEDS survey and deep H-band data from the Hubble Space Telescope CANDELS survey, over ~180 arcmin2 of the UKIDSS Ultra-Deep Survey field. Our aim is to investigate the nature of this rare population of mid-infrared …
Testing the universality of star formation - I. Multiplicity in nearby star-forming regions
Patience, Jenny; Parker, Richard J.; King, Robert R. +1 more
We have collated multiplicity data for five clusters (Taurus, Chamaeleon I, Ophiuchus, IC 348 and the Orion Nebula Cluster). We have applied the same mass ratio (flux ratios of ΔK≤ 2.5) and primary mass cuts (∼0.1-3.0 M⊙) to each cluster and therefore have directly comparable binary statistics for all five clusters in the separation ran…
The MeV spectral tail in Cyg X-1 and optically thin emission of jets
Zdziarski, Andrzej A.; Sikora, Marek; Lubiński, Piotr
We study the average X-ray and soft γ-ray spectrum of Cyg X-1 in the hard spectral state, using data from INTEGRAL. We compare these results with those from CGRO, and find a good agreement. Confirming previous studies, we find the presence of a high-energy MeV tail beyond a thermal-Comptonization spectrum; however, the tail is much softer and weak…
Evolution of dust in the Orion Bar with Herschel. I. Radiative transfer modelling
Abergel, A.; Martin, P. G.; White, G. J. +5 more
Context. Interstellar dust is a key element in our understanding of the interstellar medium and star formation. The manner in which dust populations evolve with the excitation and the physical conditions is a first step in comprehending the evolution of interstellar dust.
Aims: Within the framework of the Evolution of interstellar dust Hersch…
Gas modelling in the disc of HD 163296
Pinte, C.; Ménard, F.; Duchêne, G. +19 more
We present detailed model fits to observations of the disc around the Herbig Ae star HD 163296. This well-studied object has an age of ~4 Myr, with evidence of a circumstellar disc extending out to ~540 AU. We use the radiation thermo-chemical disc code ProDiMo to model the gas and dust in the circumstellar disc of HD 163296, and attempt to determ…
The Low-redshift Intergalactic Medium as Seen in Archival Legacy HST/STIS and FUSE Data
Shull, J. Michael; Danforth, Charles W.; Tilton, Evan M. +1 more
We present a comprehensive catalog of ultraviolet (HST/STIS and FUSE) absorbers in the low-redshift intergalactic medium (IGM) at z < 0.4. The catalog draws from much of the extensive literature on IGM absorption and reconciles discrepancies among several previous catalogs through a critical evaluation of all reported absorption features in lig…
Substructure in the lens HE 0435-1223
Keeton, Charles R.; Fadely, Ross
We investigate the properties of dark matter substructure in the gravitational lens HE 0435-1223 (zl=0.455) via its effects on the positions and flux ratios of the quadruply imaged background quasar (zs= 1.689). We start with a smooth mass model, add individual, truncated isothermal clumps near the lensed images and use the B…
Hinode Flare Catalogue
Masuda, S.; Watanabe, K.; Segawa, T.
We describe a catalogue of solar flares observed by the three instruments (SOT, XRT, EIS) onboard the Hinode satellite. From the launch of the Hinode satellite in September 2006 until late 2011, about 5000 solar flares (larger than A-class in the GOES classification) occurred during the five-year period of Hinode observations, and more than half o…
Observing simulated galaxy clusters with PHOX: a novel X-ray photon simulator
Böhringer, H.; Dolag, K.; Lemson, G. +1 more
We present a novel, virtual X-ray observatory designed to obtain synthetic observations from hydro-numerical simulations, named PHOX. In particular, we provide a description of the code constituting the photon simulator and of the new approach implemented. We apply PHOX to simulated galaxy clusters in order to demonstrate its capabilities. In fact…