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Estimation of galactic model parameters with the Sloan Digital Sky Survey and the metallicity distribution in two fields in the anti-centre direction of the Galaxy
Bilir, S.; Karaali, S.; Buser, R. +1 more
We estimated the galactic model parameters from the Sloan Digital Sky Survey (SDSS) data reduced for two fields in the anti-centre direction of the Galaxy, l= 180{o}, and symmetric relative to the galactic plane, b=+45{o} (north field) and b=-45{o} (south field). The large size of each field, 60 deg2, an…
Emission Line Variability of the Accreting Young Brown Dwarf 2MASSW J1207334-393254: From Hours to Years
Stelzer, Beate; Jayawardhana, Ray; Scholz, Alexander
We have obtained a series of high-resolution optical spectra for 2MASSW J1207334-393254 (2M 1207). Two consecutive observing nights at the ESO Very Large Telescope with the Ultraviolet and Visual Echelle Spectrograph yielded a time series with a resolution of ~12 minutes. Additional high-resolution optical spectra were obtained months apart at the…
The Local Stellar Velocity Field via Vector Spherical Harmonics
Makarov, V. V.; Murphy, D. W.
We analyze the local field of stellar tangential velocities for a sample of 42,339 nonbinary Hipparcos stars with accurate parallaxes, using a vector spherical harmonic formalism. We derive simple relations between the parameters of the classical linear model (Ogorodnikov-Milne) of the local systemic field and low-degree terms of the general vecto…
INTEGRAL and Swift observations of EXO 2030+375 during a giant outburst
Klochkov, D.; Santangelo, A.; Masetti, N. +11 more
Aims:We investigate the X-ray spectral and timing properties of the high mass X-ray binary
Methods: The data analyzed in this work are from partly simultaneous observations with INTEGRAL and Swift. The pulse period P and its temporal derivative do…
The XMM-Newton Optical Monitor survey of the Taurus molecular cloud
Audard, M.; Güdel, M.; Grosso, N. +4 more
Context: The Optical Monitor (OM) on-board XMM-Newton obtained optical/ultraviolet data for the XMM-Newton Extended Survey of the Taurus Molecular Cloud (XEST), simultaneously with the X-ray detectors.
Aims: With the XEST OM data, we study the optical and ultraviolet properties of TMC members, and to perform correlative studies between the X-r…
Remote sensing of surface pressure on Mars with the Mars Express/OMEGA spectrometer: 1. Retrieval method
Drossart, Pierre; Vinatier, Sandrine; Gendrin, Aline +7 more
Observing and analyzing the variations of pressure on the surface of a planet is essential to understand the dynamics of its atmosphere. On Mars the absorption by atmospheric CO2 of the solar light reflected on the surface allows us to measure the surface pressure by remote sensing. We use the imaging spectrometer OMEGA aboard Mars Expr…
Detection of Highly-Ionized Carbon and Nitrogen Emission Lines from the Cygnus Loop Supernova Remnant with the Suzaku Observatory
Katsuda, Satoru; Kokubun, Motohide; Hughes, John P. +3 more
We present the results of a Suzaku observation at the northeastern limb of the Cygnus Loop supernova remnant. The high detection efficiency together with the high spectral resolution of the Suzaku X-ray CCD cameras enables us to detect highly-ionized C and N emission lines from the Cygnus Loop for the first time. We performed an annular spectral a…
An X-ray look at the Seyfert 1 Galaxy Mrk 590: XMM-Newton and Chandra reveal complexity in circumnuclear gas
Bianchi, S.; Guainazzi, M.; Santos-Lleo, M. +4 more
Context: This paper reports on a partially simultaneous observation of the bright Seyfert 1 Galaxy Mrk 590, performed by XMM-Newton and Chandra.
Aims: The long exposure (~100 ks) allows us to investigate the Fe K complex at 6-7 keV and the presence of soft X-ray spectral features in great detail.
Methods: We have analysed XMM-Newton data f…
Lyα Absorption from Heliosheath Neutrals
Wood, Brian E.; Linsky, Jeffrey L.; Izmodenov, Vladislav V. +1 more
We assess the information that HST observations of stellar Lyα lines can provide on the heliosheath, the region of the heliosphere between the termination shock and heliopause. To search for evidence of heliosheath absorption, we conduct a systematic inspection of stellar Lyα lines reconstructed after correcting for ISM absorption (and heliospheri…
XMM-Newton observations of the first unidentified TeV gamma-ray source TeV J2032+4130
Santangelo, A.; Horns, D.; Hoffmann, A. I. D. +2 more
Context: The first unidentified very high energy gamma ray source (TeV J2032+4130) in the Cygnus region has been the subject of intensive search for a counterpart source at other wavelengths. In particular, observations in radio and X-rays are important to trace a population of non-thermal electrons.
Aims: A deep (≈50 ks) exposure of TeV J2032…