Search Publications
High-J CO emission spatial distribution and excitation in the Orion Bar
Abergel, A.; Parikka, A.; Habart, E. +2 more
Context. With Herschel, we can for the first time observe a wealth of high-J CO lines in the interstellar medium with a high angular resolution. These lines are specifically useful for tracing the warm and dense gas and are therefore very appropriate for a study of strongly irradiated dense photodissocation regions (PDRs).
Aims: We characteri…
Well-defined EUV wave associated with a CME-driven shock
Selhorst, C. L.; Cunha-Silva, R. D.; Fernandes, F. C. R. +1 more
Aims: We report on a well-defined EUV wave observed by the Extreme Ultraviolet Imager (EUVI) on board the Solar Terrestrial Relations Observatory (STEREO) and the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory (SDO). The event was accompanied by a shock wave driven by a halo CME observed by the Large Angle and Spec…
Discovery of two eclipsing X-ray binaries in M 51
Soria, Roberto; Liu, Jifeng; Urquhart, Ryan +1 more
We discovered eclipses and dips in two luminous (and highly variable) X-ray sources in M 51. One (CXOM51 J132943.3+471135) is an ultraluminous supersoft source, with a thermal spectrum at a temperature of about 0.1 keV and characteristic blackbody radius of about 104 km. The other (CXOM51 J132946.1+471042) has a two-component spectrum w…
Investigating the Lyman photon escape in local starburst galaxies with the Cosmic Origins Spectrograph
Buat, Véronique; Burgarella, Denis; Hernandez, Svea +4 more
We present a study of seven star-forming galaxies from the Cosmic Evolution Survey observed with the Cosmic Origins Spectrograph (COS) onboard the Hubble Space Telescope (HST). The galaxies are located at relatively low redshifts, z ∼ 0.3, with morphologies ranging from extended and disturbed to compact and smooth. To complement the HST observatio…
Unusual Cosmic Ray Variations During the Forbush Decreases of June 2015
Mavromichalaki, H.; Samara, E.; Lingri, D. +3 more
Although the current Solar Cycle 24 is characterized by low solar activity, an intense geomagnetic storm (G4) was recorded in June 2015. It was a complex phenomenon that began on 22 June 2015 as the result of intense solar activity, accompanied by several flares and coronal mass ejections that interacted with the Earth's magnetic field. A Forbush …
A method to calculate the local density distribution of the Galaxy from the Tycho-Gaia Astrometric Solution data
Kipper, Rain; Tenjes, Peeter; Tempel, Elmo
New and more reliable distances and proper motions of a large number of stars in the Tycho-Gaia Astrometric Solution (TGAS) catalogue allow us to calculate the local matter density distribution more precisely than earlier. We devised a method to calculate the stationary gravitational potential distribution perpendicular to the Galactic plane by co…
The first study of 54 new eccentric eclipsing binaries in our Galaxy
White, G. J.; Wolf, M.; Jelínek, M. +12 more
We present an analysis of the apsidal motion and light curve parameters of 54 never-before-studied galactic Algol-type binaries. This is the first analysis of such a large sample of eccentric eclipsing binaries in our Galaxy, and has enabled us to identify several systems that are worthy of further study. Bringing together data from various databa…
The Solar Neighborhood. XLIII. Discovery of New Nearby Stars with µ < 0.″18 yr-1 (TINYMO Sample)
Henry, Todd J.; Winters, Jennifer G.; Jao, Wei-Chun +5 more
We have conducted a novel search of most of the southern sky for nearby red dwarfs having low proper motions, with specific emphasis on those with µ < 0.″18 yr-1, the lower cutoff of Luyten’s classic proper-motion catalog. We used a tightly constrained search of the SuperCOSMOS database and a suite of photometric distance relat…
Constraining the Gap Size in the Disk around HD 100546 in the Mid-infrared
Henning, Thomas; van Boekel, Roy; Panić, Olja +6 more
We refine the gap size measurements of the disk surrounding the Herbig Ae star HD 100546 in the N band. Our new mid-infrared interferometric (MIDI) data have been taken with the UT baselines and span the full range of orientations. The correlated fluxes show a wavy pattern in which the minima separation links to a geometrical structure in the disk…
Identifying 3-D Vortex Structures At/Around the Magnetopause Using a Tetrahedral Satellite Configuration
Lembège, B.; Hasegawa, H.; Cai, D. +1 more
Identifying vortices is the key to understanding the turbulence in plasma shear layers. This paper aims to provide general guidelines for identifying 3-D vortex structures. Currently, no single precise definition of a vortex is universally accepted, despite the significance of vortices in fluid and plasma dynamics. Recently, various vortex identif…