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20 papers · 2 filters
Color Effects Associated with the 1999 Microlensing Brightness Peaks in Gravitationally Lensed Quasar Q2237+0305
V. G. Vakulik, R. E. Schild, V. N. Dudinov +9
Photometry of the Q2237+0305gravitational lens in VRI spectral bands with the 1.5-m telescope of the high-altitude Maidanak observatory in 1995-2000 is presented. Monitoring of Q22…
L1157: Interaction of the molecular outflow with the Class~0 environment
M. T. Beltran, F. Gueth, S. Guilloteau +1
We present high angular resolution interferometric observations of the dust continuum at 2.7 and 1.3 mm, and of the HC3N (12-11) and C18O (2-1) emission around L1157-mm, a Class~0…
A long, hard look at MCG-6-30-15 with XMM-Newton II: detailed EPIC analysis and modelling
S. Vaughan, A. C. Fabian
The bright Seyfert 1 galaxy MCG-6-30-15 has provided some of the best evidence to date for the existence of supermassive black holes in active galactic nuclei. Observations with AS…
Variability in black hole accretion discs
A. R. King, J. E. Pringle, R. G. West +1
Observations of accreting systems often show significant variability (10-20 percent of accretion luminosity) on timescales much longer than expected for the disc regions releasing…
Mapping the Remote Milky Way Halo using BHB stars at 70 < r < 130 kpc
L. Clewley, S. J. Warren, P. C. Hewett +2
We increase the number of remote halo tracers by using blue horizontal branch (BHB) stars out to Galactocentric distances of 130 kpc. We use SDSS EDR photometry and the VLT to dete…
Characterising stellar micro-variability for planetary transit searches
S. Aigrain, F. Favata, G. Gilmore
(abridged) A method for simulating light curves containing stellar micro-variability for a range of spectral types and ages, based on parameter-by-parameter scaling of a multi-comp…