Search Publications
HST/STIS Lyman-α observations of the quiet M dwarf GJ 436 . Predictions for the exospheric transit signature of the hot Neptune GJ 436b
Ehrenreich, D.; Delfosse, X.; Lecavelier Des Etangs, A.
Lyman-α (Lyα) emission of neutral hydrogen (λ1215.67 Å) is the main contributor to the ultraviolet flux of low-mass stars such as M dwarfs. It is also the main light source used in studies of the evaporating upper atmospheres of transiting extrasolar planets with ultraviolet transmission spectroscopy. However, there are very few observations of th…
Multiwavelength campaign on Mrk 509. II. Analysis of high-quality Reflection Grating Spectrometer spectra
Kaastra, J. S.; Kriss, G. A.; Bianchi, S. +11 more
Aims: We study the bright Seyfert 1 galaxy Mrk 509 with the Reflection Grating Spectrometers (RGS) of XMM-Newton, using for the first time the RGS multi-pointing mode of XMM-Newton to constrain the properties of the outflow in this object. We obtain very accurate spectral properties from a 600 ks spectrogram of Mrk 509 with excellent quality.…
Galaxy Clusters at High Redshift and Evolution of Brightest Cluster Galaxies
Han, J. L.; Wen, Z. L.
Identification of high-redshift clusters is important for studies of cosmology and cluster evolution. Using photometric redshifts of galaxies, we identify 631 clusters from the Canada-France-Hawaii Telescope (CFHT) wide field, 202 clusters from the CFHT deep field, 187 clusters from the Cosmic Evolution Survey (COSMOS) field, and 737 clusters from…
Herschel/HIFI Observations of Hydrogen Fluoride Toward Sagittarius B2(M)
Lis, D. C.; Bergin, E. A.; Phillips, T. G. +6 more
Herschel/HIFI observations have revealed the presence of widespread absorption by hydrogen fluoride (HF) J = 1-0 rotational transition, toward a number of Galactic sources. We present observations of HF J = 1-0 toward the high-mass star-forming region Sagittarius B2(M). The spectrum obtained shows a complex pattern of absorption, with numerous fea…
The Chandra ACIS Survey of M33 (ChASeM33): The Final Source Catalog
Mazeh, T.; Pietsch, W.; Haberl, F. +16 more
This study presents the final source catalog of the Chandra ACIS Survey of M33 (ChASeM33). With a total exposure time of 1.4 Ms, ChASeM33 covers ~70% of the D 25 isophote (R ≈ 4.0 kpc) of M33 and provides the deepest, most complete, and detailed look at a spiral galaxy in X-rays. The source catalog includes 662 sources, reaches a limiti…
Generation of electrostatic solitary waves in the plasma sheet boundary layer
Lakhina, G. S.; Pickett, J. S.; Singh, S. V. +1 more
Generation of electrostatic solitary waves (ESWs) in the plasma sheet boundary layer in terms of electron-acoustic solitons and double layers is proposed. The plasma sheet boundary layer is treated as a multicomponent magnetized plasma consisting of background electrons, counter-streaming electron beams and ions. The model is based on the multiflu…
Abundances of the elements He to Ni in the atmosphere of Sirius A
Landstreet, J. D.
Context. The abundances of elements in the atmosphere of an individual star provide a very broad range of extremely important information about the formation and evolution history of that star. Specifically, during the main sequence phase, the abundance pattern observed can provide valuable constraints on a range of hydrodynamical processes occurr…
The diameter of the CoRoT target HD 49933. Combining the 3D limb darkening, asteroseismology, and interferometry
Morel, P.; Berio, P.; Kervella, P. +21 more
Context. The interpretation of stellar pulsations in terms of internal structure depends on the knowledge of the fundamental stellar parameters. Long-base interferometers permit us to determine very accurate stellar radii, which are independent constraints for stellar models that help us to locate the star in the HR diagram.
Aims: Using a dir…
Ejecta Knot Flickering, Mass Ablation, and Fragmentation in Cassiopeia A
Shull, J. Michael; Fesen, Robert A.; Hammell, Molly C. +2 more
Ejecta knot flickering, ablation tails, and fragmentation are expected signatures associated with the gradual dissolution of high-velocity supernova (SN) ejecta caused by their passage through an inhomogeneous circumstellar medium or interstellar medium (ISM). Such phenomena mark the initial stages of the gradual merger of SN ejecta with and the e…
The Herschel M 33 extended survey (HerM33es): PACS spectroscopy of the star-forming region BCLMP 302
Boquien, M.; Braine, J.; Calzetti, D. +19 more
Context. The emission line of [C ii] at 158 µm is one of the strongest cooling lines of the interstellar medium (ISM) in galaxies.
Aims: Distinguishing the relative contributions of the different ISM phases to [C ii] emission is a major objective of the HerM33es program, a Herschel key project to study the ISM in the nearby spiral galax…