Search Publications
Erratum: The XMM Large-Scale Structure survey: an initial sample of galaxy groups and clusters to a redshift z < 0.6
Altieri, B.; Valtchanov, I.; Pierre, M. +14 more
We present X-ray and optical spectroscopic observations of twelve galaxy groups and clusters identified within the XMM Large-Scale Structure (LSS) survey. Groups and clusters are selected as extended X-ray sources from a 3.5 deg2 XMM image mosaic above a flux limit 8e-15 ergs/s/cm2 in the [0.5-2] keV energy band. Deep BVRI images and multi-object …
Photon scattering in the solar ultraviolet lines of HeI and HeII
Jordan, C.; Houdebine, E. R.; Smith, G. R.
Observations made with the Coronal Diagnostic Spectrometer (CDS) onboard the Solar and Heliospheric Observatory (SOHO) are used to investigate the behaviour of the intensities of the emission lines of HeI, HeII and OIII at the quiet Sun-centre and at θ= 60° towards the equatorial limb. The aim is to examine the possible effects of photon scatterin…
Physical properties as indicators of liquid compositions: Derivation of the composition for Titan's surface liquids from the Huygens SSP measurements
Lorenz, R. D.; Hagermann, A.; Leese, M. R. +5 more
We present a method for inferring the relative molar abundance of constituents of a liquid mixture, in this case methane, ethane, nitrogen and argon, from a measurement of a set of physical properties of the mixture. This problem is of interest in the context of the Huygens Surface Science Package, SSP, equipped to measure several physical propert…
Tentative detection of warm intervening gas towards PKS 0548-322 with XMM-Newton
Sako, M.; Barcons, X.; Carrera, F. J. +2 more
We present the results of a long (~93 ks) XMM-Newton observation of the bright BL-Lac object PKS 0548-322 (z= 0.069). Our Reflection Grating Spectrometer (RGS) spectrum shows a single absorption feature at an observed wavelength λ= 23.33 +/- 0.01 Å, which we interpret as OVI Kα absorption at z= 0.058, i.e. ~3000 km s-1 from the backgrou…
The XMM-Newton/2dF survey - VIII. The extended X-ray sources
Georgakakis, A.; Georgantopoulos, I.; Plionis, M. +2 more
We present a sample of eight extended X-ray sources detected in the wide-field (~2.3 deg2), bright (2-10 ks) XMM-Newton/2dF survey, reaching a flux limit of ~2 × 10-14 erg s-1 cm-2. Of these, seven are identified as secure X-ray clusters in the soft 0.3-2 keV band using a standard wavelet algorithm on ei…
Vigorous star formation in a bulge-dominated extremely red object at z= 1.34
Simpson, Chris; Cotter, Garret; Bolton, Rosemary C.
We present near-infrared (near-IR) spectroscopy of three extremely red objects (EROs) using the OHS/CISCO spectrograph at the Subaru Telescope. One target exhibits a strong emission line, which we identify as Hα at z= 1.34. Using new and existing ground-based optical and near-IR imaging, and archival Hubble Space Telescope imaging, we argue that t…
The deepest Hubble Space Telescope far-ultraviolet observations in the Large Magellanic Cloud
Brosch, Noah; Zurek, David; Shara, Michael +1 more
We present a new analysis of the deepest pure-ultraviolet (UV) observations with the highest angular resolution ever performed. A set of 12 exposures with the Hubble Space Telescope (HST) WFPC2 and F160BW filter obtained in parallel observing mode, which cover ~12 arcmin2 in the Large Magellanic Cloud (LMC), north of the bar and in the …