M. J. Page
A5004498560- Galaxies: Formation, Evolution, Phenomena
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Pulsars and Gravitational Waves Research
- Advanced X-ray Imaging Techniques
- Astro and Planetary Science
- Radio Astronomy Observations and Technology
- Adaptive optics and wavefront sensing
- Calibration and Measurement Techniques
- Atmospheric Ozone and Climate
- X-ray Spectroscopy and Fluorescence Analysis
- Spectroscopy and Laser Applications
- Superconducting and THz Device Technology
- Scientific Measurement and Uncertainty Evaluation
- CCD and CMOS Imaging Sensors
- Mechanics and Biomechanics Studies
- Particle Detector Development and Performance
- Scientific Research and Discoveries
- High-pressure geophysics and materials
- Spacecraft and Cryogenic Technologies
University College London
2015-2024
UCL Australia
2003-2015
SRON Netherlands Institute for Space Research
2007-2012
Osservatorio Astronomico di Palermo
2012
Imperial College London
2012
Division of Chemistry
2012
Goddard Space Flight Center
2011
Universities Space Research Association
2011
Southwest Research Institute
2011
Pennsylvania State University
2011
We present the photometric calibration of Swift UltraViolet/Optical Telescope (UVOT) which includes: optimum and background apertures, effective area curves, colour transformations, conversion factors for count rates to flux, zero points (which are accurate better than 4 per cent) each seven UVOT broadband filters. The was performed with observations standard stars star fields that represent a wide range spectral types. results include position dependent uniformity, instrument response over...
The Herschel Multi-tiered Extragalactic Survey (HerMES) is a legacy programme designed to map set of nested fields totalling ∼380 deg2. Fields range in size from 0.01 ∼20 deg2, using the Herschel-Spectral and Photometric Imaging Receiver (SPIRE) (at 250, 350 500 μm) Herschel-Photodetector Array Camera Spectrometer (PACS) 100 160 μm), with an additional wider component 270 deg2 SPIRE alone. These bands cover peak redshifted thermal spectral energy distribution interstellar dust thus capture...
We exploit the deep and extended far infrared data sets (at 70, 100 160 um) of Herschel GTO PACS Evolutionary Probe (PEP) Survey, in combination with HERschel Multi tiered Extragalactic Survey (HerMES) at 250, 350 500 um, to derive evolution restframe 35 60 90 total (IR) luminosity functions (LFs) up z~4. detect very strong for IR LF combined a density evolution. In agreement previous findings, increases steeply z~1, then flattens between z~1 z~3 decrease z greater than 3. Galaxies different...
We present the maps, source catalogue and number counts of largest, most complete unbiased extragalactic submillimetre survey ever undertaken: 850-micron SCUBA HAlf Degree Extragalactic Survey (SHADES). Using Submillimetre Common-User Bolometer Array (SCUBA) on James Clerk Maxwell Telescope (JCMT), SHADES mapped two separate regions sky: Subaru/XMM-Newton Deep Field (SXDF) Lockman Hole East (LH). These maps cover 720 square arcmin with an RMS noise level about 2 mJy have uncovered >100...
The Herschel Reference Survey is a guaranteed time key project and will be benchmark study of dust in the nearby universe. survey complement number other projects including large cosmological surveys that trace distant We use to produce images statistically-complete sample 323 galaxies at 250, 350 500 micron. volume-limited, containing sources with distances between 15 25 Mpc flux limits K-band minimize selection effects associated young high-mass stars introduce stellar mass. spans whole...
We report on the first deep X-ray survey with XMM-Newton observatory during performance verification phase. The field of Lockman Hole, one best studied sky areas over a very wide range wavelengths, has been observed. A total ~100 ksec good exposure time accumulated. Combining images European Photon Imaging Camera (EPIC) detectors we reach flux limit 0.31, 1.4 and , respectively in 0.5-2, 2-10, 5-10 keV band. Within an off-axis angle 10 arcmin detect 148, 112 61 sources, respectively....
We discuss the methods used to compile a high signal-to-noise dataset representative of both instrumental and cosmic background signal measured at galactic latitude by XMM-Newton EPIC cameras. The characteristics are described potential applications derived in general science analysis outlined. In case X-ray background, transition between hard power-law spectrum (due integrated emission unresolved, largely extragalactic, point sources) softer thermal (produced hot plasma associated with...
The SCUBA 8-mJy survey is the largest submillimetre (submm) extragalactic mapping undertaken to date, covering 260 arcmin2 a 4 σ detection limit of ≃8 mJy at 850 μm, centred on Lockman Hole and ELAIS N2 regions. Here, we present results new 1.4-GHz imaging these fields, depth resolution necessary reliably identify radio counterparts for 18 30 submm sources, with possible detections further 25 per cent. Armed this greatly improved positional information, analyse optical, near-infrared...
We present over 6.5 years of frequent X-ray observations the NLS1 galaxy NGC4051 by RXTE together with a >100ks observation XMM-Newton and so derive 2-10 keV PSD covering an unprecedent frequency range decades from <10^-8 to >10^-2 Hz. This is very good match galactic black hole binary system (GBH) Cyg X-1 when in `high', rather than `low', state providing first definite confirmation AGN `high' state. A bending, sharply broken, powerlaw better description PSDs high NGC4051. At low...
The Ultraviolet/Optical Telescope (UVOT) is one of three instruments onboard the Swift observatory. photometric calibration has been published, and this paper follows up with details on other aspects including a measurement point spread function an assessment orbital variation effect photometry. A correction for large-scale variations in sensitivity over field view described, as well model coincidence loss which used to assess extended regions. We have provided detector distortion measured...
We set out to determine the ratio, q(IR), of rest-frame 8-1000um flux, S(IR), monochromatic radio S(1.4GHz), for galaxies selected at far-IR and wavelengths, search signs that ratio evolves with redshift, luminosity or dust temperature, identify any far-IR-bright outliers - useful laboratories exploring why far-IR/radio correlation is generally so tight when prevailing theory suggests variations are almost inevitable. use flux-limited 250-um 1.4-GHz samples, obtained in GOODS-N using...
We present a detailed analysis of Swift multi-wavelength observations GRB 070110 and its remarkable afterglow. The early X-ray light curve, interpreted as the tail prompt emission, displays spectral evolution already seen in other gamma-ray bursts. optical afterglow shows shallow decay up to ~2 d after burst, which is not consistent with standard models. most intriguing feature very steep flux at ~20 ks ending an apparent plateau. abrupt drop curve rules out external shock origin plateau...
We study the evolution of dust temperature galaxies in SFR− M∗ plane up to z ~ 2 using far-infrared and submillimetre observations from Herschel Space Observatory taken as part PACS Evolutionary Probe (PEP) Multi-tiered Extragalactic Survey (HerMES) guaranteed time key programmes. Starting a sample with reliable star-formation rates (SFRs), stellar masses (M∗) redshift estimates, we grid M∗parameter space several ranges estimate mean (Tdust) each SFR–M∗ − bin. Dust temperatures are inferred...
We present new results on the cosmological evolution of near-infrared (near-IR) galaxy luminosity function (LF), derived from analysis a sample ∼22 000 KAB≤ 22.5 galaxies selected over an area 0.6 deg2 Early Data Release UKIDSS Ultra Deep Survey (UDS). Our study has exploited multiwavelength coverage UDS field provided by WFCAM K- and J-band imaging, Subaru/XMM–Newton Spitzer Wide-Area Infrared Extragalactic survey. The unique combination large depth this survey minimizes complicating effect...
The <i>Herschel<i/> Space Observatory enables us to accurately measure the bolometric output of starburst galaxies and active galactic nuclei (AGN) by directly sampling peak their far-infrared (IR) emission. Here we examine whether spectral energy distribution (SED) dust temperature have strongly evolved over last 80% age Universe. We discuss possible consequences for determination star-formation rates (SFR) any evidence a major change in properties. use deep extragalactic surveys from 100...
(abridged) Far-infrared Herschel photometry from the PEP and HerMES programs is combined with ancillary datasets in GOODS-N, GOODS-S, COSMOS fields. Based on this rich dataset, we reproduce restframe UV to FIR ten-colors distribution of galaxies using a superposition multi-variate Gaussian modes. The median SED each mode then fitted modified version MAGPHYS code that combines stellar light, emission dust heated by stars possible warm contribution an AGN. defined grouping also used identify...
Discerning the exact nature of sub-mJy radio population has been historically difficult due to low luminosity these sources at most wavelengths. Using deep ground based optical follow-up and observations from Spitzer Space Telescope we are able disentangle radio-selected Active Galactic Nuclei (AGN) Star Forming Galaxy (SFG) populations for first time in a multi-frequency VLA/MERLIN Survey 13^H XMM-Newton/Chandra Deep Field. The discrimination diagnostics include morphology, spectral index,...
We present Keck spectroscopic observations and redshifts for a sample of 767 Herschel-SPIRE selected galaxies (HSGs) at 250, 350, 500 μm, taken with the I Low Resolution Imaging Spectrometer II DEep Multi-Object Spectrograph. The redshift distribution these SPIRE sources from Herschel Multitiered Extragalactic Survey peaks z = 0.85, 731 < 2 tail out to ∼ 5. measure more significant disagreement between photometric (〈Δz/(1 + zspec)〉 0.29) than is seen in non-infrared samples, likely due...
We use Herschel Space Observatory data to place observational constraints on the peak and Rayleigh-Jeans slope of dust emission observed at 70-500 microns in nearby spiral galaxy M81. find that ratios wave bands between 160 500 are primarily dependent radius but ratio 70 micron shows no clear dependence surface brightness or radius. These results along with analyses spectral energy distributions imply 160-500 traces 15-30 K heated by evolved stars bulge disc whereas includes active galactic...
We have used the IRAM Plateau de Bure millimetre interferometer and UKIRT 1–5 μm Imager Spectrometer (UIST) to test connection between major phases of spheroid growth nuclear accretion by mapping CO emission in nine submillimetre-detected QSOs at z= 1.7–2.6 with black hole (BH) masses derived from near-infrared spectroscopy. When combined one QSO obtained literature, we present sensitive CO(3–2) or CO(2–1) observations 10 selected epoch peak activity both submillimetre (submm) galaxies...