Search Publications
Star formation histories within the Antennae galaxies (Arp244)
Kong, Xu; Gao, Yu; Zhang, Hong-Xin
With the imagery from Galaxy Evolution Explorer, Hubble Space Telescope, Two Micron All Sky Survey and Spitzer and at the resolution of Multiband Imaging Photometer for Spitzer (MIPS) 24µm (~6arcsec), we study the variations of the broad-band spectral energy distributions of star-forming regions within the nearest prototypal major merger - t…
CoRoT photometry and high-resolution spectroscopy of the interacting eclipsing binary AU Monocerotis
Amado, P. J.; Baudin, F.; Poretti, E. +15 more
Analyses of very accurate CoRoT space photometry, past Johnson V photoelectric photometry and high-resolution echelle spectra led to the determination of improved and consistent fundamental stellar properties of both components of AU Monocerotis. We derived new, accurate ephemerides for both the orbital motion (with a period of ) and the long-term…
The Circum-Hellas Volcanic Province, Mars: Assessment of wrinkle-ridged plains
HRSC Co-Investigator Team; Greeley, Ronald; Williams, David A. +3 more
Wrinkle-ridged plains, common on the terrestrial planets, are inferred to form by tectonic deformation of volcanic or sedimentary surfaces. If wrinkle-ridged plains adjacent to volcanic features originated from volcanic activity associated with the features, then the plains should have similar ages to the volcanic features, as well as other morpho…
High-resolution X-ray spectroscopy of the Seyfert 1 Mrk 841: insights into the warm absorber and warm emitter
Costantini, E.; Ponti, G.; Boisson, C. +6 more
Context. The Seyfert 1 galaxy Mrk 841 was observed five times between 2001 and 2005 by the XMM-Newton X-ray observatory. The source is well known for showing spectral complexity in the variable iron line and in the soft X-ray excess.
Aims: The availability of multiple exposures obtained by the reflection grating spectrometer (RGS) cameras all…
Radially extended kinematics and stellar populations of the massive ellipticals NGC 1600, NGC 4125, and NGC 7619 . Constraints on the outer dark halo density profile
Saglia, R. P.; Thomas, J.; Bender, R. +3 more
We present high quality long slit spectra along the major and minor axes out to 1.5-2 Re (14-22 kpc) of three bright elliptical galaxies (NGC 1600, NGC 4125, NGC 7619) obtained at the Hobby-Eberly Telescope (HET). We derive stellar kinematic profiles and Lick/IDS indices (Hβ, Mgb, Fe5015, Fe5270, Fe5335,…
On the chains of star complexes and superclouds in spiral arms
Efremov, Yu. N.
We study the relation between the occurrence of a regular chain of star complexes and superclouds in a spiral arm, and other properties of the spiral arm. A regular string of star complexes is located in the north-western arm of M31; these have about the same size, 0.6 kpc with spacing of 1.1 kpc. Within the same arm segment, a regular magnetic fi…
Star-galaxy separation by far-infrared color-color diagrams for the AKARI FIS all-sky survey (bright source catalog version β-1)
Takeuchi, T. T.; Pollo, A.; Rybka, P.
Aims: To separate stars and galaxies in the far infrared AKARI all-sky survey data, we have selected a sample with the complete color information available in the low extinction regions of the sky and constructed color-color plots for these data. We looked for the method of separating stars and galaxies using the color information.
Metho…
First Very Low Frequency Detection of Short Repeated Bursts from Magnetar SGR J1550-5418
Takahashi, T.; Hayakawa, M.; Tanaka, Y. T. +7 more
We report on the first detection of ionospheric disturbances caused by short repeated gamma-ray bursts from the magnetar SGR J1550-5418. Very low frequency (VLF) radio wave data obtained in South America clearly show sudden amplitude and phase changes at the corresponding times of eight soft gamma-ray repeater bursts. Maximum amplitude and phase c…
Multiwavelength Imaging and Spectroscopy of Chromospheric Evaporation in an M-class Solar Flare
Temmer, M.; Veronig, A. M.; Vršnak, B. +6 more
We study spectroscopic observations of chromospheric evaporation mass flows in comparison with the energy input by electron beams derived from hard X-ray (HXR) data for the white-light M2.5 flare of 2006 July 6. The event was captured in high-cadence spectroscopic observing mode by SOHO/CDS combined with high-cadence imaging at various wavelengths…
Seasonal Changes in Titan's Polar Trace Gas Abundance Observed by Cassini
Irwin, P. G. J.; Teanby, N. A.; de Kok, R. +1 more
We use a six-year data set (2004-2010) of mid-infrared spectra measured by Cassini's Composite InfraRed Spectrometer to search for seasonal variations in Titan's atmospheric temperature and composition. During most of Cassini's mission Titan's northern hemisphere has been in winter, with an intense stratospheric polar vortex highly enriched in tra…