Search Publications
The ATLAS3D project - V. The CO Tully-Fisher relation of early-type galaxies
Krajnović, Davor; Emsellem, Eric; Sarzi, Marc +20 more
We demonstrate here using both single-dish and interferometric observations that CO molecules are an excellent kinematic tracer, even in high-mass galaxies, allowing us to investigate for the first time the CO Tully-Fisher relation (CO-TFR) of early-type galaxies. We compare the TFRs produced using both single-dish and interferometric data and var…
Possible detection of two giant extrasolar planets orbiting the eclipsing polar UZ Fornacis
O'Donoghue, Darragh; Ramsay, Gavin; Buckley, David A. H. +11 more
We present new high-speed, multi-observatory, multi-instrument photometry of the eclipsing polar UZ For in order to measure precise mid-eclipse times with the aim of detecting any orbital period variations. When combined with published eclipse times and archival data spanning ∼27 years, we detect departures from a linear and quadratic trend of ∼60…
Further X-ray observations of EXO 0748-676 in quiescence: evidence for a cooling neutron star crust
Degenaar, N.; Wijnands, R.; Ray, P. S. +8 more
In late 2008, the quasi-persistent neutron star X-ray transient and eclipsing binary EXO 0748-676 started a transition from outburst to quiescence, after it actively accreted for more than 24 yr. In a previous work, we discussed Chandra and Swift observations obtained during the first 5 months of this transition. Here, we report on further X-ray o…
The HST/ACS Coma Cluster Survey - III. Structural parameters of galaxies using single Sérsic fits
Ferguson, Henry C.; Balcells, Marc; Graham, Alister W. +14 more
We present a catalogue of structural parameters for 8814 galaxies in the 25 fields of the Hubble Space Telescope/ACS Coma Treasury Survey. Parameters from Sérsic fits to the two-dimensional surface brightness distributions are given for all galaxies from our published Coma photometric catalogue with mean effective surface brightness brighter than …
Limits on the local dark matter density
Read, Justin I.; Garbari, Silvia; Lake, George
We revisit systematics in determining the local dark matter density ρdm from the vertical motion of stars in the solar neighbourhood. Using a simulation of a Milky Way like galaxy, we determine the data quality required to detect ρdm at its expected local value. We introduce a new method for recovering ρdm that use…
Investigating coronal saturation and supersaturation in fast-rotating M-dwarf stars
Briggs, K. R.; Jeffries, R. D.; Evans, P. A. +2 more
At fast rotation rates, the coronal activity of G- and K-type stars has been observed to 'saturate' and then decline again at even faster rotation rates - a phenomenon dubbed 'supersaturation'. In this paper, we investigate coronal activity in fast-rotating M-dwarfs using deep XMM-Newton observations of 97 low-mass stars of known rotation period i…
A reflection origin for the soft and hard X-ray excess of Ark 120
Fabian, A. C.; Nardini, E.; Reis, R. C. +1 more
Over the last few years, several models have been proposed to interpret the widespread soft excess observed in the X-ray spectra of type 1 active galactic nuclei (AGN). In particular, reflection from the photoionized accretion disc blurred by relativistic effects has proven to be successful in reproducing both the spectral shape and the variabilit…
New star-forming galaxies at z≈ 7 from Wide Field Camera Three imaging
Wilkins, Stephen M.; Bunker, Andrew J.; Caruana, Joseph +1 more
The addition of Wide Field Camera Three on the Hubble Space Telescope has led to a dramatic increase in our ability to study the z > 6 Universe. The improvement in the near-infrared (NIR) sensitivity of WFC3 over previous instruments has enabled us to reach apparent magnitudes approaching 29 (AB). This allows us to probe the rest-frame UV conti…
A strong and broad Fe line in the XMM-Newton spectrum of the new X-ray transient and black hole candidate XTE J1652-453
Done, Chris; Hiemstra, Beike; Méndez, Mariano +3 more
We observed the new X-ray transient and black hole candidate XTE J1652-453 simultaneously with XMM-Newton and the Rossi X-ray Timing Explorer (RXTE). The observation was done during the decay of the 2009 outburst, when XTE J1652-453 was in the hard-intermediate state. The spectrum shows a strong and broad Fe emission line with an equivalent width …
PG 1211+143: probing high-frequency lags in a high-mass active galactic nucleus
Cappi, M.; Ponti, G.; Fabian, A. C. +4 more
We present the timing analysis of the four archived XMM-Newton observations of PG 1211+143. The source is well-known for its spectral complexity, comprising a strong soft excess and different absorption systems. Soft energy band (0.3-0.7 keV) lags are detected over all the four observations, in the frequency range ν≲ 6 × 10-4 Hz, where …