Search Publications
HADES RV Programme with HARPS-N at TNG. VI. GJ 3942 b behind dominant activity signals
Rebolo, R.; Ribas, I.; Morales, J. C. +29 more
Context. Short- to mid-term magnetic phenomena on the stellar surface of M-type stars can resemble the effects of planets in radial velocity data, and may also hide them.
Aims: We analyze 145 spectroscopic HARPS-N observations of GJ 3942 taken over the past five years and additional photometry in order to disentangle stellar activity effects …
Background derivation and image flattening: getimages
Men'shchikov, A.
Modern high-resolution images obtained with space observatories display extremely strong intensity variations across images on all spatial scales. Source extraction in such images with methods based on global thresholding may bring unacceptably large numbers of spurious sources in bright areas while failing to detect sources in low-background or l…
Nature of shocks revealed by SOFIA OI observations in the Cepheus E protostellar outflow
Godard, B.; Codella, C.; Benedettini, M. +12 more
Context. Protostellar jets and outflows are key features of the star-formation process, and primary processes of the feedback of young stars on the interstellar medium. Understanding the underlying shocks is necessary to explain how jet and outflow systems are launched, and to quantify their chemical and energetic impacts on the surrounding medium…
Magnetic topological analysis of coronal bright points
Madjarska, M. S.; Huang, Z.; Wiegelmann, T. +2 more
Context. We report on the first of a series of studies on coronal bright points which investigate the physical mechanism that generates these phenomena.
Aims: The aim of this paper is to understand the magnetic-field structure that hosts the bright points.
Methods: We use longitudinal magnetograms taken by the Solar Optical Telescope wit…
Jets of SS 433 on scales of dozens of parsecs
Panferov, Alexander A.
Context. The radio nebula W 50 harbours the relativistic binary system
Spatial distribution of far-infrared rotationally excited CH+ and OH emission lines in the Orion Bar photodissociation region
Abergel, A.; Godard, B.; Gerin, M. +7 more
Context. The methylidyne cation (CH+) and hydroxyl (OH) are key molecules in the warm interstellar chemistry, but their formation and excitation mechanisms are not well understood. Their abundance and excitation are predicted to be enhanced by the presence of vibrationally excited H2 or hot gas ( 500-1000 K) in photodissociat…
Solar Hα features with hot onsets. II. A contrail fibril
Rouppe van der Voort, L. H. M.; Rutten, R. J.
The solar chromosphere observed in Hα consists mostly of narrow fibrils. The longest typically originate in network or plage and arch far over adjacent internetwork. We use data from multiple telescopes to analyze one well-observed example in a quiet area. It resulted from the earlier passage of an accelerating disturbance in which the gas was hea…
Disturbed galaxy clusters are more abundant in an X-ray volume-limited sample
Böhringer, Hans; Chon, Gayoung
X-ray observations of clusters of galaxies have been used to study the large-scale structure of our Universe and to test cosmological models. In such studies it is critical to understand the unique survey selection function correctly. In comparison to the cluster detection by the Sunyaev-Zel'dovich effect (SZE), it has been shown that X-ray observ…
Sixteen years of X-ray monitoring of Sagittarius A*: Evidence for a decay of the faint flaring rate from 2013 August, 13 months before a rise in the bright flaring rate
Grosso, Nicolas; Mossoux, Enmanuelle
Context. X-ray flaring activity from the closest supermassive black hole Sagittarius A* (Sgr A*) located at the center of our Galaxy has been observed since 2000 October 26 thanks to the current generation of X-ray facilities. In a study of X-ray flaring activity from Sgr A* using Chandra and XMM-Newton public observations from 1999 to 2014 and Sw…
A multiwavelength observation and investigation of six infrared dark clouds
Zhang, Chuan-Peng; Li, Guang-Xing; Wang, Jun-Jie +2 more
Context. Infrared dark clouds (IRDCs) are ubiquitous in the Milky Way, yet they play a crucial role in breeding newly-formed stars.
Aims: With the aim of further understanding the dynamics, chemistry, and evolution of IRDCs, we carried out multiwavelength observations on a small sample.
Methods: We performed new observations with the IRA…