Search Publications
Clumpy galaxies at z ~ 0.6: kinematics, stability and comparison with analogues at other redshifts
Puech, M.
Distant clumpy galaxies are thought to be Jeans-unstable discs and an important channel for the formation of local galaxies, as suggested by recent spatially resolved kinematic observations of z ~ 2 galaxies. I study the kinematics of clumpy galaxies at z ~ 0.6 and compare their properties with those of counterparts at higher and lower redshifts. …
Identification of Faint Chandra X-ray Sources in the Core-collapsed Globular Cluster NGC 6397: Evidence for a Bimodal Cataclysmic Variable Population
Anderson, Jay; Bogdanov, Slavko; Heinke, Craig O. +6 more
We have searched for optical identifications for 79 Chandra X-ray sources that lie within the half-mass radius of the nearby, core-collapsed globular cluster NGC 6397, using deep Hubble Space Telescope Advanced Camera for Surveys Wide Field Channel imaging in Hα, R, and B. Photometry of these images allows us to classify candidate counterparts bas…
Rapid Cooling of the Neutron Star in the Quiescent Super-Eddington Transient XTE J1701-462
Homan, Jeroen; Cackett, Edward M.; Fridriksson, Joel K. +7 more
We present Rossi X-Ray Timing Explorer and Swift observations made during the final three weeks of the 2006-2007 outburst of the super-Eddington neutron star (NS) transient XTE J1701-462, as well as Chandra and XMM-Newton observations covering the first ≃800 days of the subsequent quiescent phase. The source transitioned quickly from active accret…
High-resolution X-ray spectroscopy of the interstellar medium. XMM-Newton observation of the LMXB GS 1826-238
Kaastra, J. S.; Costantini, E.; Pinto, C. +1 more
Aims: The interstellar medium (ISM) has a multiphase structure characterized by gas, dust, and molecules. The gas can be found in different charge states: neutral, weakly ionized (warm) and highly ionized (hot). It is possible to probe the multiphase ISM through the observation of its absorption lines and edges in the X-ray spectra of backgro…
CoRoT opens a new era in hot B subdwarf asteroseismology. Detection of multiple g-mode oscillations in KPD 0629-0016
Auvergne, M.; Baudin, F.; Chaintreuil, S. +10 more
Context. The asteroseismic exploitation of long period, g-mode hot B subdwarf (sdB) pulsators has been a long sought objective undermined, thus far, by the difficulty of obtaining sufficiently precise and continuous time series data from the ground.
Aims: Fast photometry from space appears to be the only means of gathering the appropriate ast…
The X-ray spectrum of the newly discovered accreting millisecond pulsar IGR J17511-3057
Papitto, A.; Burderi, L.; Bozzo, E. +5 more
We report on a 70 ks XMM-Newton Target of Opportunity (ToO) observation of the newly discovered accreting millisecond pulsar, IGR J17511-3057. Pulsations at 244.8339512(1)Hz are observed throughout the outburst with an rms-pulsed fraction of 14.4(3) per cent. Pulsations have been used to derive a precise solution for the Porb = 12487.51…
Spectral and stratigraphic mapping of hydrated sulfate and phyllosilicate-bearing deposits in northern Sinus Meridiani, Mars
Arvidson, R. E.; Morris, R. V.; Poulet, F. +7 more
We present detailed stratigraphic and spectral analyses that focus on a region in northern Sinus Meridiani located between 1°N to 5°N latitude and 3°W to 1°E longitude. Several stratigraphically distinct units are defined and mapped using morphologic expression, spectral properties, and superposition relationships. Previously unreported exposures …
Herschel observations of the W43 ``mini-starburst''
Testi, L.; Zavagno, A.; Motte, F. +20 more
Aims: To explore the infrared and radio properties of one of the closest Galactic starburst regions.
Methods: Images obtained with the Herschel Space Observatory at wavelengths of 70, 160, 250, 350, and 500 µm using the PACS and SPIRE arrays are analyzed and compared with radio continuum VLA data and 8 µm images from the Spit…
Galaxy group at z = 0.3 associated with the damped Lyman α system towards quasar Q1127-145
Kacprzak, Glenn G.; Churchill, Christopher W.; Murphy, Michael T.
We performed a spectroscopic galaxy survey, complete to mF814W <= 20.3 (LB > 0.15L*B at z = 0.3), within 100 × 100 arcsec2 of the quasar Q1127-145 (zem = 1.18). The Very Large Telescope/Ultraviolet and Visual Echelle Spectrograph (UVES) quasar spectrum contains three zabs…
The Structure and Dynamics of the Upper Chromosphere and Lower Transition Region as Revealed by the Subarcsecond VAULT Observations
Nestoras, I.; Teriaca, L.; Patsourakos, S. +5 more
The Very high Angular resolution ULtraviolet Telescope (VAULT) is a sounding rocket payload built to study the crucial interface between the solar chromosphere and the corona by observing the strongest line in the solar spectrum, the Ly α line at 1216 Å. In two flights, VAULT succeeded in obtaining the first ever subarcsecond ( 0.5\hbox{$^''$} ) i…