Search Publications
Supersoft X-Ray Sources in M31. II. ROSAT-detected Supersoft Sources in the ROSAT, Chandra, and XMM-Newton Eras
Greiner, J.; Primini, F.; Di Stefano, R. +1 more
We have performed Chandra observations during the past three years of five of the M31 supersoft X-ray sources discovered with ROSAT. Surprisingly, only one of these sources has been detected, despite a predicted detection of about 20-80 counts for these sources. This has motivated a thorough check of the ROSAT M31 Survey I data, including a relaxa…
Spatially extended K Iλ7699 emission in the nebula of VY CMa: kinematics and geometry
Smith, Nathan
Long-slit echelle spectra reveal bright extended emission from the K Iλ7699 resonance line in the reflection nebula surrounding the extreme red supergiant VY Canis Majoris. The central star has long been known for its unusually bright K I emission lines, but this is the first report of intrinsic emission from K I in the nebula. The extended emissi…
PV Cephei: Young Star Caught Speeding?
Arce, Héctor G.; Goodman, Alyssa A.
Three independent lines of evidence imply that the young star PV Cep is moving at roughly 20 km s-1 through the interstellar medium. The first and strongest suggestion of motion comes from the geometry of the Herbig-Haro (HH) knots in the ``giant'' HH flow associated with PV Cep. Bisectors of lines drawn between pairs of knots at nearly…
XMM-Newton witness of M 86 X-ray metamorphosis
Finoguenov, A.; Pietsch, W.; Aschenbach, B. +1 more
The environmental influence of cluster media on its member galaxies, known as Butcher-Oemler effect, has recently been subject to revision due to numerous observations of strong morphological transformations occurring outside the cluster virial radii, caused by some unidentified gas removal processes. In this context we present new XMM-Newton obse…
An XMM-Newton observation of the nova-like variable UX UMa: spatially and spectrally resolved two-component X-ray emission
Mukai, K.; Pratt, G. W.; Hassall, B. J. M. +2 more
In the optical and ultraviolet regions of the electromagnetic spectrum, UX Ursae Majoris is a deeply eclipsing cataclysmic variable. However, no soft X-ray eclipse was detected in ROSAT observations. We have obtained a 38 ksec XMM-Newton observation to constrain further the origin of the X-rays. The combination of spectral and timing information a…
Low-Mass Pre-Main-Sequence Stars in the Large Magellanic Cloud. III. Accretion Rates from Hubble Space Telescope WFPC2 Observations
Panagia, N.; Robberto, M.; Romaniello, M.
We have measured the present accretion rate of roughly 800 low-mass (~1-1.4 Msolar) pre-main-sequence stars in the field of supernova 1987A in the Large Magellanic Cloud (Z~=0.3 Zsolar). It is the first time that this fundamental parameter for star formation has been determined for low-mass stars outside our Galaxy. The Balme…
Oblique propagation of 30 s period fast magnetosonic foreshock waves: A Cluster case study
Balogh, A.; Dandouras, I.; Eastwood, J. P. +2 more
It is accepted that the 30 s period Ultra-Low-Frequency waves observed in the terrestrial foreshock are generated by backstreaming ions through the ion-ion right hand instability. However, such waves are generally observed to propagate obliquely to the field, in direct contrast to theoretical predictions of parallel propagation. A case study, base…
The structure of high altitude O+ energization and outflow: a case study
Lundin, R.; Balogh, A.; Dandouras, I. +10 more
Available from http://www.copernicus.org/site/EGU/annales/22/7/2497.htm?FrameEngine=false;
Ionized gas and stars in the central kiloparsec of the type 2 Seyfert galaxy NGC 2110 - I. The data
Schinnerer, E.; Wilson, A. S.; Emsellem, E. +4 more
In this paper, we present new results from an extensive set of Hubble Space Telescope (HST) and ground-based observations of the Seyfert galaxy NGC 2110. The HST data sets include Wide Field Planetary Camera 2 (WFPC2) observations as well as the first high-spatial resolution spectroscopy ([OI], [NII], Hα and [SII] lines) of this galaxy obtained us…
An ISOCAM survey through gravitationally lensing galaxy clusters. II. The properties of infrared galaxies in the A2218 field
Kneib, J. -P.; Altieri, B.; Kessler, M. F. +10 more
We have observed the cluster Abell 2218 (z=0.175) with ISOCAM on board the Infrared Space Observatory using two filters, LW2 and LW3, with reference wavelengths of 6.7 and 14.3 µm, respectively. We detected 76 sources down to 54 and 121 µJy (50% completeness levels) at 6.7 and 14.3 µm, respectively. All these sources have visible…