Search Publications
Interaction of a coronal mass ejection and a stream interaction region: A case study
Geyer, Paul; Dumbović, Mateja; Temmer, Manuela +3 more
We investigated the interaction of a coronal mass ejection (CME) and a coronal hole (CH) in its vicinity using remote-sensing and 1 AU in situ data. We used extreme-ultraviolet images and magnetograms to identify coronal structures and coronagraph images to analyze the early CME propagation. The Wind spacecraft and the Advanced Composition Explore…
Activity distribution of comet 67P/Churyumov-Gerasimenko from combined measurements of non-gravitational forces and torques
Jorda, L.; Agarwal, J.; Groussin, O. +5 more
Aims: Understanding the activity is vital for deciphering the structure, formation, and evolution of comets. We investigate models of cometary activity by comparing them to the dynamics of 67P/Churyumov-Gerasimenko.
Methods: We matched simple thermal models of water activity to the combined Rosetta datasets by fitting to the total outgas…
Beyond the disk: EUV coronagraphic observations of the Extreme Ultraviolet Imager on board Solar Orbiter
Zhang, X.; Schmutz, W.; Mierla, M. +38 more
Context. Most observations of the solar corona beyond 2 R⊙ consist of broadband visible light imagery carried out with coronagraphs. The associated diagnostics mainly consist of kinematics and derivations of the electron number density. While the measurement of the properties of emission lines can provide crucial additional diagnostics …
Deuterium fractionation across the infrared-dark cloud G034.77−00.55 interacting with the supernova remnant W44
Caselli, P.; Viti, S.; Jiménez-Serra, I. +10 more
Context. Supernova remnants (SNRs) may regulate star formation in galaxies. For example, SNR-driven shocks may form new molecular gas or compress pre-existing clouds and trigger the formation of new stars.
Aims: To test this scenario, we measured the deuteration of N2H+, DfracN2H+
The unusual planetary nebula nucleus in the Galactic open cluster M37 and six further hot white dwarf candidates
Rebassa-Mansergas, Alberto; Raddi, Roberto; Torres, Santiago +6 more
Planetary nebulae in Galactic open star clusters are rare objects; only three are known to date. They are of particular interest because their distance can be determined with high accuracy, allowing one to characterize the physical properties of the planetary nebula and its ionizing central star with high confidence. Here we present the first quan…
Source positions of an interplanetary type III radio burst and anisotropic radio-wave scattering
Maksimovic, Milan; Kontar, Eduard P.; Chen, Xingyao +7 more
Interplanetary solar radio type III bursts provide the means to remotely study and track energetic electrons propagating in the interplanetary medium. Due to the lack of direct radio source imaging, several methods have been developed to determine the source positions from space-based observations. Moreover, none of the methods consider the propag…
VISIONS: the VISTA Star Formation Atlas. I. Survey overview
Meingast, Stefan; Alves, João; Rottensteiner, Alena +37 more
VISIONS is an ESO public survey of five nearby (d < 500 pc) star-forming molecular cloud complexes that are canonically associated with the constellations of Chamaeleon, Corona Australis, Lupus, Ophiuchus, and Orion. The survey was carried out with the Visible and Infrared Survey Telescope for Astronomy (VISTA), using the VISTA Infrared Camera …
Update of the INTEGRAL/IBIS active galactic nuclei catalogue: Deeper on the Galactic plane and wider beyond
Palazzi, E.; Masetti, N.; Bird, A. J. +7 more
In this work we have updated the list of active galactic nuclei (AGN) detected by INTEGRAL taking into account the new objects listed in the last published INTEGRAL/IBIS survey. We have collected 83 new AGN, increasing the number of INTEGRAL-detected active galaxies (436) by 19%. Half of these new additions are located behind the Galactic plane, a…
First detection of CHD2OH towards pre-stellar cores
Caselli, P.; Spezzano, S.; Lin, Y.
The inheritance of material across the star and planet formation process is traced by deuterium fractionation. We report here the first detection of doubly deuterated methanol towards pre-stellar cores. We study the deuterium fractionation of methanol, CH3OH, towards two starless and two pre-stellar cores. We derive a D/H ratio of 0.8-1…
Nitrogen fractionation in ammonia and its insights into nitrogen chemistry
Caselli, P.; Pineda, J. E.; Bizzocchi, L. +1 more
Context. Observations of the nitrogen isotopic ratio 14N/15N in the interstellar medium are becoming more frequent thanks to increased telescope capabilities. However, interpreting these data is still puzzling. In particular, measurements of 14N/15N in diazenylium have revealed high levels of anti-fracti…