Search Publications
The initial conditions of isolated star formation - VI. SCUBA mappingof pre-stellar cores
Ward-Thompson, D.; André, P.; Kirk, J. M.
Observations have been carried out with the Submillimetre Common-User Bolometer Array (SCUBA) at the James Clerk Maxwell Telescope (JCMT) of regions of comparatively isolated star formation in molecular cloud cores. Some 52 starless cores were observed, which are molecular cloud cores that do not contain any sign of protostellar activity such as i…
The Hubble Deep Field North SCUBA Super-map - III. Optical and near-infrared properties of submillimetre galaxies
Dickinson, Mark; Mobasher, Bahram; Pope, Alexandra +3 more
We present a new submillimetre (submm) super-map in the Hubble Deep Field North (HDF-N) region (Great Observatories Origins Deep Survey North, GOODS-N, field), containing 40 statistically robust sources at 850µm. This map contains additional data, and several new sources, including one of the brightest blank-sky extragalactic submm sources e…
Transforming observational data and theoretical isochrones into the ACS/WFC Vega-mag system
Anderson, Jay; Salaris, Maurizio; Bedin, Luigi R. +5 more
We propose a zero-point photometric calibration of the data from the Advanced Camera for Surveys (ACS) Wide Field Channel (WFC) on board the Hubble Space Telescope, based on a spectrum of Vega and the most up-to-date in-flight transmission curves of the camera. This calibration is accurate at the level of a few hundredths of a magnitude. The main …
MCG-6-30-15: long time-scale X-ray variability, black hole mass and active galactic nuclei high states
Uttley, P.; Goad, M. R.; McHardy, I. M. +1 more
We present a detailed study of the long time-scale X-ray variability of the Seyfert 1 Galaxy MCG-6-30-15, based on eight years of frequent monitoring observations with the Rossi X-ray Timing Explorer. When combined with the published short-time-scale XMM-Newton observations, we derive the power-spectral density (PSD) covering six decades of freque…
Positron annihilation spectrum from the Galactic Centre region observed by SPI/INTEGRAL
Sunyaev, R.; Revnivtsev, M.; Sazonov, S. +2 more
The electron-positron annihilation spectrum observed by SPI/INTEGRAL during deep Galactic Centre region exposure is reported. The line energy (510.954+/-0.075 keV) is consistent with the unshifted annihilation line. The width of the annihilation line is 2.37 +/- 0.25 keV (full width at half-maximum), while the strength of the ortho-positronium con…
Spitzer imaging of i'-drop galaxies: old stars at z~ 6
Bunker, Andrew J.; Ellis, Richard S.; Stanway, Elizabeth R. +3 more
We present new evidence for mature stellar populations with ages >100Myr in massive galaxies (Mstellar > 1010Msolar) seen at a time when the Universe was less than 1Gyr old. We analyse the prominent detections of two z~ 6 star-forming galaxies (SBM03#1 and #3) made at wavelengths corresponding to the rest-fra…
Polar shapelets
Refregier, Alexandre; Massey, Richard
The shapelets method for image analysis is based upon the decomposition of localized objects into a series of orthogonal components with convenient mathematical properties. We extend the `Cartesian shapelet' formalism from earlier work, and construct `polar shapelet' basis functions that separate an image into components with explicit rotational s…
The progenitor of SN 2005cs in the Whirlpool Galaxy
Smartt, Stephen J.; Maund, Justyn R.; Danziger, I. John
The progenitor of SN 2005cs, in the galaxy M51, is identified in pre-explosion Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) Wide Field Channel (WFC) imaging. Differential astrometry, with post-explosion ACS High Resolution Channel (HRC) F555W images, permitted the identification of the progenitor with an accuracy of 0.006 arcsec.…
XMM-Newton spectroscopy of high-redshift quasars
O'Brien, P. T.; Reeves, J. N.; Page, K. L. +1 more
XMM-Newton observations of 29 high-redshift (z > 2) quasars, including seven radio-quiet, 16 radio-loud and six broad absorption line (BAL) objects, are presented; due to the high redshifts, the rest-frame energy bands extend up to ~30-70 keV. Over 2-10 keV, the quasars can be well fitted in each case by a simple power law, with no strong evide…
Absolute dimensions of detached eclipsing binaries - I. The metallic-lined system WW Aurigae
Maxted, P. F. L.; Southworth, J.; Claret, A. +2 more
WW Aurigae is a detached eclipsing binary composed of two metallic-lined A-type stars orbiting each other every 2.5 d. We have determined the masses and radii of both components to accuracies of 0.4 and 0.6 per cent, respectively. From a cross-correlation analysis of high-resolution spectra we find masses of 1.964 +/- 0.007 Msolar for t…