Search Publications
Missions
Journals
Publication Years
Constraining the parameters of globular cluster NGC 1904 from its variable star population
Arellano Ferro, A.; Kains, N.; Bramich, D. M. +3 more
Aims: We present the analysis of 11 nights of V and I time-series observations of the globular cluster NGC 1904 (M 79). Using this we searched for variable stars in this cluster and attempted to refine the periods of known variables, making use of a time baseline spanning almost 8 years. We use our data to derive the metallicity and distance …
Physical properties of Herschel selected galaxies in a semi-analytic galaxy formation model
Ferguson, Henry C.; Koekemoer, Anton M.; Somerville, Rachel S. +3 more
We make use of a semi-analytic cosmological model that includes simple prescriptions for dust attenuation and emission to make predictions for the observable and physical properties of galaxies that may be detected by the recently launched HerschelSpace Observatory in deep fields such as Great Observatories Origins Deep Survey-Herschel. We compare…
Magnetic Variances and Pitch-angle Scattering Times Upstream of Interplanetary Shocks
Zimbardo, Gaetano; Perri, Silvia
Recent observations of power-law time profiles of energetic particles accelerated at interplanetary shocks have shown the possibility of anomalous, superdiffusive transport for energetic particles throughout the heliosphere. Those findings call for an accurate investigation of the magnetic field fluctuation properties at the resonance frequencies …
Silica-rich Bright Debris Disk around HD 15407A
Onaka, Takashi; Fukagawa, Misato; Murakami, Hiroshi +5 more
We report an intriguing debris disk toward the F3V star HD 15407A in which an extremely large amount of warm fine dust (~10-7 M ⊕) is detected. The dust temperature is derived as ~500-600 K and the location of the debris dust is estimated as 0.6-1.0 AU from the central star, a terrestrial planet region. The fractional luminos…
The cosmological analysis of X-ray cluster surveys - I. A new method for interpreting number counts
Pierre, M.; Clerc, N.; Pacaud, F. +1 more
We present a new method aimed at simplifying the cosmological analysis of X-ray cluster surveys. It is based on purely instrumental observable quantities considered in a two-dimensional X-ray colour-magnitude diagram (hardness ratio versus count rate). The basic principle is that even in rather shallow surveys, substantial information on cluster r…
Geophysical evolution of Saturn's satellite Phoebe, a large planetesimal in the outer Solar System
Lunine, J. I.; Matson, D. L.; Johnson, T. V. +3 more
Saturn's satellite Phoebe is the best-characterized representative of large outer Solar System planetesimals, thanks to the close flyby by the Cassini spacecraft in June 2004. We explore the information contained in Phoebe's physical properties, density and shape, which are significantly different from those of other icy objects in its size range.…
High Angular Resolution Radio Observations of a Coronal Mass Ejection Source Region at Low Frequencies during a Solar Eclipse
Ramesh, R.; Kathiravan, C.; Barve, Indrajit V. +1 more
We carried out radio observations of the solar corona in the frequency range 109-50 MHz during the annular eclipse of 2010 January 15 from the Gauribidanur Observatory, located about 100 km north of Bangalore in India. The radio emission in the above frequency range originates typically in the radial distance range ≈1.2-1.5 R ⊙ in the "…
Time-dependent modelling of the molecular line emission from shock waves in outflow sources
Pineau des Forêts, G.; Flower, D. R.
We have developed further the technique of time-dependent modelling of magnetohydrodynamic shock waves, with a view to interpreting the molecular line emission from outflow sources. The extensively observed source L1157 B1 was chosen as an exemplar of the application of this technique. The dynamical age of the shock wave model was varied in the ra…
Herschel observations of Cen A: stellar heating of two extragalactic dust clouds
Elbaz, D.; Cooray, A.; Galametz, M. +18 more
We present the first results of a multiwavelength survey, incorporating Herschel-?, Spitzer, GALEX and <fr>Australian Telescope Compact Array (ATCA)</fr> observations, of a 1°× 1° field centred on Centaurus A. As well as detecting the inner lobes of the active galactic nucleus (AGN) jet and counterjet, we have found two clouds, bright …
[C ii] 158 µm line detection of the warm ionized medium in the Scutum-Crux spiral arm tangency
Goldsmith, P. F.; Langer, W. D.; Pineda, J. L. +1 more
Context. The Herschel HIFI GOT C+ Galactic plane [C ii] spectral survey has detected strong emission at the spiral arm tangencies.
Aims: We use the unique viewing geometry of the Scutum-Crux (S-C) tangency nearl = 30° to detect the warm ionized medium (WIM) component traced by [CII] and to study the effects of spiral density waves on Interste…