Browsing University of Hertfordshire by Title
Now showing items 23968-23987 of 24093
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X-linked ichthyosis with hypogonadism : not always Kallmann's syndrome
(2006)We describe two males with congenital ichthyosis secondary to steroid sulphatase deficiency who also manifested delayed puberty with biochemical features of hypogonadotrophic hypogonadism. In the first patient a history ... -
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
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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 ...