Search Publications
Black hole accretion discs in the canonical low-hard state
Fabian, A. C.; Miller, J. M.; Reis, R. C.
Stellar mass black holes in the low-hard state may hold clues to jet formation and basic accretion disc physics, but the nature of the accretion flow remains uncertain. A standard thin disc can extend close to the innermost stable circular orbit, but the inner disc may evaporate when the mass accretion rate is reduced. Blackbody-like continuum emi…
Pixel-based correction for Charge Transfer Inefficiency in the Hubble Space Telescope Advanced Camera for Surveys
Ellis, Richard; Leauthaud, Alexie; Massey, Richard +4 more
Charge Transfer Inefficiency (CTI) due to radiation damage above the Earth's atmosphere creates spurious trailing in Hubble Space Telescope (HST) images. Radiation damage also creates unrelated warm pixels - but these happen to be perfect for measuring CTI. We model CTI in the Advanced Camera for Surveys (ACS)/Wide Field Channel and construct a ph…
Optical and near-infrared coverage of SN 2004et: physical parameters and comparison with other Type IIP supernovae
Smartt, S. J.; Maguire, K.; Cappellaro, E. +22 more
We present new optical and near-infrared (NIR) photometry and spectroscopy of the Type IIP supernova (SN), SN 2004et. In combination with already published data, this provides one of the most complete studies of optical and NIR data for any Type IIP SN from just after explosion to +500d. The contribution of the NIR flux to the bolometric light cur…
Feeding versus feedback in NGC4151 probed with Gemini NIFS - II. Kinematics
Martini, P.; Storchi-Bergmann, T.; Riffel, Rogemar A. +3 more
We have used the Gemini Near-infrared Integral Field Spectrograph (NIFS) to map the gas kinematics of the inner ~200 × 500pc2 of the Seyfert galaxy NGC4151 in the Z, J, H and K bands at a resolving power of >=5000 and spatial resolution of ~8pc. The ionized gas emission is most extended along the known ionization bi-cone at position …
On the fraction of star clusters surviving the embedded phase
Bastian, N.; Kennicutt, R. C.; Goddard, Q. E.
In this paper we derive ages and masses for 276 clusters in the merger galaxy NGC 3256. This was achieved by taking accurate photometry in four wavebands from archival Hubble Space Telescope images. Photometric measurements are compared to synthetic stellar population (SSP) models to find the most probable age, mass and extinction. The cluster pop…
Gas, dust and stars in the SCUBA galaxy, SMMJ02399-0136: the EVLA reveals a colossal galactic nursery
Kneib, J. -P.; Ivison, R. J.; Smail, Ian +5 more
We present new multiwavelength observations of the first submillimetre-selected galaxy (SMG) SMMJ02399-0136 at z = 2.8. These observations include mapping of the CO J=1->0 emission using elements of the Expanded Very Large Array, as well as high-resolution 1.4-GHz imaging and optical/infrared (IR) data from the Very Large Array, Hubble Space Te…
A Hubble Space Telescope NICMOS and ACS morphological study of z ~ 2 submillimetre galaxies
Ivison, R. J.; Smail, Ian; Alexander, D. M. +6 more
We present a quantitative morphological analysis using Hubble Space Telescope Near Infrared Camera and Multi-Object Spectrometer H160-band imaging and Advanced Camera for Surveys I775-band imaging of 25 spectroscopically confirmed submillimetre galaxies (SMGs) which have redshifts between (). Our analysis also employs a compa…
High-resolution CO and radio imaging of ULIRGs: extended CO structures and implications for the universal star formation law
Beswick, R.; Genzel, R.; Ivison, R. J. +14 more
We present high spatial resolution (0.4 arcsec, kpc) Plateau de Bure Interferometer interferometric data on three ultraluminous infrared galaxies (ULIRGs) at : two submillimetre galaxies (SMGs) and one submillimetre faint star-forming radio galaxy. The three galaxies have been robustly detected in CO rotational transitions, either 12CO …
Chandra observation of two shock fronts in the merging galaxy cluster Abell 2146
Fabian, A. C.; McNamara, B. R.; Russell, H. R. +5 more
We present a new Chandra observation of the galaxy cluster Abell 2146 which has revealed a complex merging system with a gas structure that is remarkably similar to the Bullet cluster. The X-ray image and temperature map show a cool 2 -3 keV subcluster with a ram pressure stripped tail of gas just exiting the disrupted 6 - 7 keV primary cluster. F…
On the stellar masses of IRAC detected Lyman Break Galaxies at z ~ 3
Magdis, G. E.; Rigopoulou, D.; Fazio, G. G. +1 more
We present results of a large survey of the mid-infrared (mid-IR) properties of 248 Lyman Break Galaxies (LBGs) with confirmed spectroscopic redshift using deep Spitzer/Infrared Array Camera (IRAC) observations in six cosmological fields. By combining the new mid-IR photometry with optical and near-infrared observations, we model the spectral ener…