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Deuteration of c-C3H2 towards the pre-stellar core L1544
Caselli, P.; Spezzano, S.; Sipilä, O. +7 more
Context. In the centre of pre-stellar cores, the deuterium fractionation is enhanced due to the cold temperatures and high densities. Therefore, the chemistry of deuterated molecules can be used to probe the evolution and the kinematics in the earliest stages of star formation.
Aims: We analyse emission maps of cyclopropenylidene, c-C3
SIRIUS Project - V. Formation of off-centre ionized bubbles associated with Orion Nebula Cluster
Shimajiri, Yoshito; Hattori, Kohei; Wang, Long +4 more
Massive stars born in star clusters terminate star cluster formation by ionizing the surrounding gas. This process is considered to be prevalent in young star clusters containing massive stars. The Orion Nebula is an excellent example associated with a forming star cluster including several massive stars (the Orion Nebula Cluster, ONC) and a 2-pc-…
Searching for anomalous microwave emission in nearby galaxies. K-band observations with the Sardinia Radio Telescope
Bianchi, S.; Madden, S. C.; Galliano, F. +9 more
Aims: We observed four nearby spiral galaxies (NGC 3627, NGC 4254, NGC 4736, and NGC 5055) in the K band with the 64-m Sardinia Radio Telescope, with the aim of detecting anomalous microwave emission (AME), a radiation component presumably due to spinning dust grains, which has been observed thus far in the Milky Way and only in a handful of …
Common envelope evolution in born-again planetary nebulae - Shaping the H-deficient ejecta of A 30
Chu, Y. -H.; Guerrero, M. A.; Toalá, J. A. +7 more
Born-again planetary nebulae (PNe) are extremely rare cases in the evolution of solar-like stars. It is commonly accepted that their central stars (CSPN) experienced a very late thermal pulse (VLTP), ejecting H-deficient material inside the evolved H-rich PN. Given the short duration of this event and the fast subsequent evolution of the CSPN, det…
3D Reconnection Geometries With Magnetic Nulls: Multispacecraft Observations and Reconstructions
He, Jiansen; Guo, Ruilong; Pu, Zuyin +2 more
Magnetic reconnection is universal in various plasma environments like the solar atmosphere, planetary magnetosphere, and laboratory to trigger explosive phenomena. Its nature and magnetic structure in two dimensions (2D) have been abundantly analyzed. The three-dimensional (3D) characteristics of reconnection are different from 2D, and the myster…
THA 15−31: Discovery with VLT/X-shooter and Swift/UVOT of a new symbiotic star of the accreting-only variety
Masetti, N.; Munari, U.; Alcalá, J. M. +4 more
We report the discovery and characterization of a new symbiotic star of the accreting-only variety, which we observed in the optical/near-infrared (NIR) with VLT/X-shooter and in the X-rays/ultraviolet with Swift/UVOT+XRT. The new symbiotic star, THA 15−31, was previously described as a pre-main sequence star belonging to the Lupus 3 association. …
A journey of exploration to the polar regions of a star: probing the solar poles and the heliosphere from high helio-latitude
Schmutz, W.; Fineschi, Silvano; Romoli, Marco +29 more
A mission to view the solar poles from high helio-latitudes (above 60°) will build on the experience of Solar Orbiter as well as a long heritage of successful solar missions and instrumentation (e.g. SOHO Domingo et al. (Solar Phys. 162(1-2), 1-37 1995), STEREO Howard et al. (Space Sci. Rev. 136(1-4), 67-115 2008), Hinode Kosugi et al. (Solar Phys…
SRGA J124404.1-632232/SRGU J124403.8-632231: New X-ray pulsar discovered in the all-sky survey by the SRG
Haberl, F.; Santangelo, A.; Gromadzki, M. +12 more
Ongoing all-sky surveys by the eROSITA and the Mikhail Pavlinsky ART-XC telescopes on board the Spectrum-Roentgen-Gamma (SRG) mission have already revealed over a million of X-ray sources. One of them, SRGA J124404.1-632232/SRGU J124403.8-632231, was detected as a new source in the third (of the planned eight) consecutive X-ray surveys by ART-XC. …
Statistical study and corresponding evolution of plasmaspheric plumes under different levels of geomagnetic storms
Yuan, Zhigang; Ouyang, Zhihai; Deng, Xiaohua +4 more
Using observations of Van Allen Probes, we present a statistical study of plasmaspheric plumes in the inner magnetosphere. Plasmaspheric plumes tend to occur during the recovery phase of geomagnetic storms. Furthermore, the results imply that the occurrence rate of observed plasmaspheric plume in the inner magnetosphere is larger during stronger g…
Explosive volcanism in Noctis Fossae on Mars
Pieterek, B.; Laban, M.; Ciążela, J. +1 more
Based on theoretical considerations, basaltic volcanism of explosive character should be common on Mars. Although the record of explosive volcanic fields on Mars continues to grow, many unexplored volcanic fields remain. In this research, we identified a group of 25 volcanic cones and associated lava flows emplaced in the Noctis Fossae region on M…