Search Publications
Polycyclic aromatic hydrocarbon emission bands in selected planetary nebulae: a study of the behaviour with gas phase C/O ratio
Barlow, M. J.; Cohen, Martin
Airborne and space-based low-resolution spectroscopy in the 1980s discovered tantalizing quantitative relationships between the gas phase C/O abundance ratio in planetary nebulae (PNe) and the fractions of total far-infrared (FIR) luminosity radiated by the 7.7- and 11.3-µm bands (the C = C stretch and C-H bend, respectively), of polycyclic …
The XMM-Newton Needles in the Haystack Survey: the local X-ray luminosity function of `normal' galaxies
Georgakakis, A.; Georgantopoulos, I.; Koulouridis, E.
In this paper we estimate the local (z < 0.22) X-ray luminosity function of `normal' galaxies derived from the XMM-Newton Needles in the Haystack Survey. This is an on-going project that aims to identify X-ray-selected normal galaxies (i.e. non-AGN dominated) in the local Universe. We are using a total of 70 XMM-Newton fields covering an area o…
X-ray bright optically inactive galaxies in XMM-Newton/Sloan Digital Sky Survey fields: more diluted than absorbed?
Georgakakis, A.; Georgantopoulos, I.
We explore the properties of X-ray bright optically inactive galaxies (XBONGs) detected in the 0.5-8 keV spectral band in 20 public XMM-Newton fields overlapping with the Sloan Digital Sky Survey (SDSS). We constrain our sample to optically extended systems with logfX/fopt > -2 that have spectroscopic identifications avail…
The evolution of Ks-selected galaxies in the GOODS/CDFS deep ISAAC field
McLure, R. J.; Dunlop, J. S.; Caputi, K. I. +1 more
We present estimated redshifts and derived properties of a sample of 1663 galaxies with Ks<= 22 (Vega), selected from 50.4 arcmin2 of the Great Observatories Origins Deep Survey/Chandra Deep Field South (GOODS/CDFS) field with deep Infrared Spectrometer and Array Camera (ISAAC) imaging, and make an extensive comparison of …
Tycho-2 stars with infrared excess in the MSX Point Source Catalogue
Lumsden, S. L.; Oudmaijer, R. D.; Clarke, A. J.
Stars of all evolutionary phases have been found to have excess infrared emission due to the presence of circumstellar material. To identify such stars, we have positionally correlated the infrared Mid-Course Space Experiment (MSX) Point Source Catalogue and the Tycho-2 optical catalogue. Near-mid-infrared colour criteria have been developed to se…
X-ray synchrotron emission from the oblique shock in the jet of the powerful radio galaxy 3C346
Birkinshaw, M.; Worrall, D. M.
We report the first detection, with Chandra, of X-ray emission from the jet of the powerful narrow-line radio galaxy 3C346. X-rays are detected from the bright radio and optical knot at which the jet apparently bends by approximately 70°. The Chandra observation also reveals a bright galaxy-scale atmosphere within the previously known cluster and …
XMM-Newton observations of the ultra-compact binary RX J1914+24
Cropper, Mark; Wu, Kinwah; Ramsay, Gavin +4 more
We present XMM-Newton observations of the 569-s-period system RX J1914+24 (V407 Vul). This period is believed to represent the binary orbital period making it an ultracompact binary system. By comparing the phase of the rise to maximum X-ray flux at various epochs (this includes observations made using ROSAT, ASCA and Chandra) we find that the sys…
The lens and source of the optical Einstein ring gravitational lens ER 0047-2808
Lewis, Geraint F.; Warren, Stephen J.; Hewett, Paul C. +1 more
We perform a detailed analysis of the optical gravitational lens ER 0047-2808 imaged with the Wide Field Planetary Camera 2 on the Hubble Space Telescope. Using software specifically designed for the analysis of resolved gravitational lens systems, we focus on how the image alone can constrain the mass distribution in the lens galaxy. We find that…
An XMM-Newton and Chandra study of the starburst galaxy IC 10
Whitaker, Katherine E.; Wang, Q. Daniel; Williams, Rosa
We present an X-ray study of our nearest starburst galaxy IC 10, based on XMM-Newton and Chandra observations. A list of 73 XMM-Newton and 28 Chandra detections of point-like X-ray sources in the field is provided; a substantial fraction of them are likely stellar objects in the Milky Way due to the low Galactic latitude location of IC 10. The bri…
Chemical abundances of very metal-poor stars
Zhao, G.; Zhang, H. W.
High-resolution and high signal-to-noise ratio spectra of 32 very metal-poor stars were obtained with the Coudé echelle spectrograph mounted on the 2.16-m telescope at the National Astronomical Observatories (Xinglong, China). Equivalent widths of FeI, FeII, OI, NaI, MgI, AlI, SiI, SiII, KI, CaI, ScII, TiI, VI, CrI, MnI, NiI, CuI and BaII lines we…