Search Publications
L183 (L134N) Revisited. I. The very cold core and the ridge
Miville-Deschênes, M. -A.; Lagache, G.; Teyssier, D. +8 more
We report new 1.2 mm continuum observations of the
X-ray and ultraviolet observations of the dwarf nova VW Hyi in quiescence
Pandel, Dirk; Howell, Steve B.; Córdova, France A.
We present an analysis of X-ray and ultraviolet (UV) data of the dwarf nova VW Hyi that were obtained with XMM-Newton during the quiescent state. The X-ray spectrum indicates the presence of an optically thin plasma in the boundary layer that cools as it settles on to the white dwarf. The plasma has a continuous temperature distribution that is we…
Statistical re-examination of reported emission lines in the X-ray afterglow of GRB 011211
Sako, Masao; Rutledge, Robert E.
A 0.2-12 keV spectrum obtained with the XMM-Newton EPIC/pn instrument of GRB 011211, taken in the first 5 ks of a 27-ks observation, was found by Reeves et al. in 2002 to contain emission lines that were interpreted to be from MgXI, SiXIV, SXVI, ArXVIII and CaXX, at a lower redshift (zobs= 1.88) than that of the host galaxy (zhost<…
Radio Emission Associated with Ultraluminous X-Ray Sources in the Galaxy Merger NGC 3256
Neff, S. G.; Ulvestad, James S.; Campion, S. D.
We present new 6, 3.6, and 2 cm VLA radio observations of the nearby merger system NGC 3256, with resolutions of ~100 pc, which reveal compact radio sources embedded in more diffuse emission at all three wavelengths. The two radio nuclei are partially resolved, but the two dominant compact sources that remain coincide with the two most powerful co…
An XMM-Newton-based X-ray survey of pre-main sequence stellar emission in the L1551 star-forming complex
Micela, G.; Favata, F.; Giardino, G. +2 more
We present a study of the X-ray sources present in the nearby L1551 star forming region, based on a deep XMM-Newton observation complemented with Chandra data for the brightest sources. Most known pre-main sequence stars in the region have been detected, most of them with sufficient statistics to allow a detailed study of the temporal and spectral…
V, J, H and K imaging of the metal rich globular cluster NGC 6528. Reddening, metallicity, and distance based on cleaned colour-magnitude diagrams
Momany, Y.; Bedin, L. R.; Held, E. V. +6 more
New near-infrared observations of NGC 6528 are presented. The JHKs observations complement a previous HST/NICMOS data set by Ortolani et al. (\cite{ortolani01}), in that they sample a larger area, contain a more numerous sample of red giant stars, and include the K band. Also, archival HST data sets (separated by 6.093 years) were used …
Extragalactic globular clusters in the near infrared III. NGC 5846 and NGC 7192. Quantifying the age distribution of sub-populations
Minniti, D.; Hilker, M.; Kissler-Patig, M. +3 more
In this third paper of our series on near-IR and optical photometry of globular cluster systems in early-type galaxies we concentrate on the photometric results for NGC 5846 and NGC 7192, two group ellipticals, and on a first comparison between the globular cluster systems investigated so far. In NGC 5846 the colour-colour diagram shows clear bi-m…
The blue host galaxy of the red GRB 000418
Pian, E.; Palazzi, E.; Greiner, J. +25 more
We report on multi-band (UBVRIZJsKs) observations of the host galaxy of the April 18, 2000 gamma-ray burst. The Spectral Energy Distribution (SED) is analysed by fitting empirical and synthetic spectral templates. We find that: (i) the best SED fit is obtained with a starburst template, (ii) the photometric redshift is consis…
Distances to Cepheid open clusters via optical and K-band imaging
Tanvir, N. R.; Shanks, Tom; Hoyle, Fiona
We investigate the reddening and main-sequence-fitted distances to 11 young, Galactic open clusters that contain Cepheids. Each cluster contains or is associated with at least one Cepheid variable star. Reddening to the clusters is estimated using the U-B:B-V colours of the OB stars and the distance modulus to the cluster is estimated via B-V:V an…
Iron K-features in the hard X-ray XMM-Newton spectrum of NGC 4151
Schurch, N. J.; Warwick, R. S.; Griffiths, R. E. +1 more
Recent XMM-Newton observations have measured the hard (2.5-12 keV) X-ray spectrum of the well-known Seyfert galaxy NGC 4151 with a signal-to-noise unprecedented for this source. We find that a spectral model, developed to fit previous BeppoSAX and ASCA observations of NGC 4151, provides an excellent description of the XMM-Newton European Photon Im…