Browsing University of Hertfordshire by Title
Now showing items 24181-24200 of 24305
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X-Phi and the challenge from ad hoc concepts
(2023-05-03)Ad hoc concepts feature prominently in lexical pragmatics. A speaker can use a word or phrase to communicate an ad hoc concept that is different from the lexically encoded concept and the hearer can construct the intended ... -
X-ray absorption and reprocessing in the z ∼ 2.5 lensed quasar 2MASS J1042+1641
(2022-10-19)We present new broad-band X-ray observations of the z ∼ 2.5 lensed quasar 2MASS J1042+1641, combining XMM–Newton, Chandra, and NuSTAR to provide coverage of the X-ray spectrum over the 0.3–40 keV bandpass in the observed ... -
The X-ray cataclysmic variable 1E0643.0 −1648
(1981)We have used a new simultaneous IR/optical high-speed photometer on the UK IR telescope to study the recently discovered X-ray cataclysmic variable 1E0643.0−1648 (refs 1, 2). The light curve of this object obtained by the ... -
X-ray emission from an expanding supergiant shell in IC 2574
(1998)We present a multiwavelength study of a supergiant shell within the violent interstellar medium of the nearby dwarf galaxy IC 2574, which is a member of the M81 group of galaxies. Neutral hydrogen (H i) observations obtained ... -
X-ray emission from the extended emission-line region of the powerful radio galaxy 3C 171
(2010)We present Chandra X-ray observations of the powerful radio galaxy 3C 171, which reveal an extended region of X-ray emission spatially associated with the well-known 10-kpc scale optical emission-line region around the ... -
The X-ray Emission of Low-Power Radio Galaxies
(Astronomical Society of the Pacific, 2003)A low-power radio galaxy generally emits X-rays from a compact X-ray core, its brighter kpc-scale radio jet, and a galaxy atmosphere. The core emission is normally predominantly radio related. The kpc-scale jet emission ... -
X-ray flare candidates in short gamma-ray bursts
(2011-11-01)We present the first systematic study of X-ray flare candidates in short gamma-ray bursts (SGRBs) exploiting the large 6-year Swift data base with the aim to constrain the physical nature of such fluctuations. We find that ... -
X-ray groups and clusters of galaxies in the Subaru–XMM Deep Field
(2010)We present the results of a search for galaxy clusters in the Subaru–XMM Deep Field (SXDF). We reach a depth for a total cluster flux in the 0.5–2 keV band of 2 × 10−15 erg cm−2 s−1 over one of the widest XMM–Newton ... -
The X-ray jet and central structure of the active galaxy NGC 315
(2003-08)We report the Chandra detection of resolved X-ray emission of luminosity 3.5 × 1040 ergs s−1 (0.4–4.5 keV) and power-law energy spectral index = 1.5 ± 0.7 from a roughly 10 arcsec length of the north-west radio jet in ... -
The X-ray jet and halo of PKS 0521-365
(2002-09) -
X-Ray Nuclei in Radio Galaxies: Exploring the Roles of Hot and Cold Gas Accretion
(Astronomical Society of the Pacific, 2008)We present results from Chandra and XMM-Newton spectroscopic observations of the nuclei of z < 0.5 radio galaxies and quasars from the 3CRR catalog, and examine in detail the dichotomy in the properties of low- and ... -
The X-ray nuclei of intermediate-redshift radio sources
(2006)We present a Chandra and XMM-Newton spectral analysis of the nuclei of the radio galaxies and radio-loud quasars from the 3CRR sample in the redshift range 0.1 < z < 0.5. In the range of radio luminosity sampled by these ... -
X-ray observations of low-power radio galaxies from the B2 catalogue
(1999)We present an analysis of X-ray data, taken with ROSAT, for a well defined sample of low-power radio galaxies from the Bologna B2 catalogue. Where possible, the HRI has been used in order to take advantage of the higher ... -
X-Ray Observations of Superbubbles in Dwarf Galaxies
(Revista Mexicana de Astronom a y Astrof sica, 2000)There is plenty of evidence from neutral hydrogen observations for a violent interstellar medium, dominated by hot-plasma filled superbubbles. However, there are few direct observations of their thermal X-ray emission from ... -
X-ray properties of the Youngest Radio Sources and their Environments
(2016-05-23)We present the first results from our X-ray study of young radio sources classified as compact symmetric objects (CSOs). Using the Chandra X-ray Observatory we observed six CSOs for the first time in X-rays, and re-observed ...