A5090054372- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Pulsars and Gravitational Waves Research
- Astronomical Observations and Instrumentation
- Geophysics and Gravity Measurements
- Advanced Optical Sensing Technologies
- Calibration and Measurement Techniques
University of Nottingham
2017-2024
The discovery of the first electromagnetic counterpart to a gravitational wave signal has generated follow-up observations by over 50 facilities world-wide, ushering in new era multi-messenger astronomy. In this paper, we present event GW170817 and its SSS17a/DLT17ck (IAU label AT2017gfo) 14 Australian telescopes partner observatories as part Australian-based Australian-led research programs. We report early- late-time multi-wavelength observations, including optical imaging spectroscopy,...
In the currently debated context of using clusters galaxies as cosmological probes, need for well-defined cluster samples is critical. The XXL Survey has been specifically designed to provide a well characterised sample some 500 X-ray detected suitable studies. main goal present article make public and describe properties catalogue in its state, associated catalogues super-clusters fossil groups. We release containing 365 total. give details follow-up observations explain procedure adopted...
We present the version of point source catalogue XXL Survey that was used, in part, first series papers. In this paper we release, our database Milan and at CDS: (i) X-ray with 26056 objects two areas 25 deg2; (ii) associated multiwavelength catalogues candidate counterparts sources infrared, near-infrared, optical, ultraviolet (plus spectroscopic redshift when available); (iii) a redshifts recently obtained southern area. also basic properties their counterparts. Other described second...
We present the first attempt to select AGN using long-term NIR variability. By analysing K-band light curves of all galaxies in UKIDSS Ultra Deep Survey, deepest survey over ~1 sq degree, we have isolated 393 variable candidates. A comparison other selection techniques shows that only half sources are also selected either deep Chandra X-ray imaging or IRAC colour selection, suggesting variability can locate missed by more standard techniques. In particular, find identifies at low...
In this work, we use 8 years of deep near-infrared imaging to select and study a new set 601 active galaxies identified through long-term (NIR) variability in the UKIDSS Ultra Deep Survey (UDS). These objects are compared 710 X-ray bright AGN detected by Chandra observatory. We show that infrared emission distinct sets galaxies, finding only 37 per cent overlap both techniques confirming NIR-variable be typically quiet. Examining mass functions shows NIR detects activity over significantly...
ABSTRACT Information on the structure around active galactic nuclei (AGNs) has long been derived from measuring lags in their varying light output at different wavelengths. In principle, infrared data would reach to larger radii, potentially even probing reprocessed radiation any surrounding dusty torus. practice, this proved challenging because high quality are required detect such variability, and observations must stretch over a period probe likely month-scale variability. addition, large...