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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…
Velocity Measurements for a Solar Active Region Fan Loop from Hinode/EIS Observations
Young, P. R.; Mason, H. E.; O'Dwyer, B.
The velocity pattern of a fan loop structure within a solar active region over the temperature range 0.15-1.5 MK is derived using data from the EUV Imaging Spectrometer (EIS) on board the Hinode satellite. The loop is aligned toward the observer's line of sight and shows downflows (redshifts) of around 15 km s-1 up to a temperature of 0…
The VLT-FLAMES Tarantula Survey. IV. Candidates for isolated high-mass star formation in 30 Doradus
Crowther, P. A.; Bastian, N.; de Koter, A. +15 more
Whether massive stars (≳30 M⊙) can occasionally form in relative isolation (e.g. in clusters with M < 100 M⊙) or if they require a large cluster of lower-mass stars around them is a key test in the differentiation of star-formation theories as well as how the initial mass function of stars is sampled. Previous attempts to …
The Nature and Nurture of Bars and Disks
Corsini, E. M.; Aguerri, J. A. L.; Sánchez-Janssen, R. +2 more
The effects that interactions produce on galaxy disks and how they modify the subsequent formation of bars need to be distinguished to fully understand the relationship between bars and environment. To this aim we derive the bar fraction in three different environments ranging from the field to Virgo and Coma Clusters, covering an unprecedentedly …
Long-term Measurements of Sunspot Magnetic Tilt Angles
Li, Jing; Ulrich, Roger K.
Tilt angles of close to 30,600 sunspots are determined using Mount Wilson daily averaged magnetograms taken from 1974 to 2012, and SOHO/MDI magnetograms taken from 1996 to 2010. Within a cycle, more than 90% of sunspots have a normal polarity alignment along the east-west direction following Hale's law. The median tilts increase with increasing la…
The CHESS Survey of the L1157-B1 Shock Region: CO Spectral Signatures of Jet-driven Bow Shocks
Codella, C.; Ceccarelli, C.; Benedettini, M. +7 more
The unprecedented sensitivity of Herschel coupled with the high resolution of the HIFI spectrometer permits studies of the intensity-velocity relationship I(v) in molecular outflows, over a higher excitation range than possible up to now. Over the course of the CHESS Key Program, we have observed toward the bright bow shock region L1157-B1, the CO…