Search Publications
Formation and dynamics of transequatorial loops
Tripathi, Durgesh; Ghosh, Avyarthana
Aims: We aim to study the dynamical evolution of transequatorial loops (TELs) using imaging techniques and spectroscopy.
Methods: We used the images recorded by the Atmospheric Imaging Assembly and the Helioseismic Magnetic Imager on board the Solar Dynamics Observatory together with spectroscopic observations taken from the Extreme-Ultr…
UV and NIR size of the low-mass field galaxies: the UV compact galaxies
Cheng, Cheng; Huang, Jia-Sheng; Pan, Zhizheng +10 more
Context. Most of the massive star-forming galaxies are found to have "inside-out" stellar mass growth modes, which means the inner parts of the galaxies mainly consist of the older stellar population, while the star forming in the outskirt of the galaxy is still ongoing.
Aims: The high-resolution HST images from Hubble Deep UV Legacy Survey a…
The multi-phase ISM in the nearby composite AGN-SB galaxy NGC 4945: large-scale (parsecs) mechanical heating
Weiss, A.; Martín-Pintado, J.; van der Werf, P. P. +8 more
Context. Understanding the dominant heating mechanism in the nuclei of galaxies is crucial to understanding star formation in starbursts (SBs), active galactic nuclei (AGN) phenomena, and the relationship between star formation and AGN activity in galaxies. Analysis of the carbon monoxide (12CO) rotational ladder versus the infrared con…
Open Universe survey of Swift-XRT GRB fields: Flux-limited sample of HBL blazars
D'Elia, V.; Giommi, P.; Pollock, A. M. T. +22 more
Aims: The sample of serendipitous sources detected in all Swift-XRT images pointing at gamma ray bursts (GRBs) constitutes the largest existing medium-deep survey of the X-ray sky. To build such dataset we analysed all Swift X-ray images centred on GRBs and observed over a period of 15 years using automatic tools that do not require any exper…
The nature of the NGC 2546: Not one but two open clusters
González, J. F.; Veramendi, M. E.; Alejo, A. D.
Context. As part of a broader project on the role of binary stars in clusters, we present a spectroscopic study of the open cluster NGC 2546, which is a large cluster lacking previous spectroscopic analysis.
Aims: We report the finding of two open clusters in the region of NGC 2546. For the two star groups, we determine radial velocity, paral…
An extreme ultraluminous X-ray source X-1 in NGC 5055
Mondal, Samaresh; De Marco, Barbara; Różańska, Agata +1 more
Aims: We analysed multi-epoch X-ray data of the ultraluminous X-ray source NGC 5055 X-1, with luminosity up to 2.32 × 1040 erg s-1, to constrain the physical parameters of the source.
Methods: We performed a timing and spectral analysis of Chandra and XMM-Newton observations. We used spectral models that assume the …
Unusually low density regions in the compressed slow wind: Solar wind transients of small coronal hole origin
Farrugia, Charles J.; Wang, Linghua; Fu, Hui +5 more
We report on two small solar wind transients embedded in the corotating interaction region, characterized by surprisingly lower proton density compared with their surrounding regions. In addition to lower density, these two small solar wind transients showed other interesting features like higher proton temperature, higher alpha-proton ratios, and…
The origin of globular cluster FSR 1758
Korchagin, Vladimir I.; Carraro, Giovanni; Ortolani, Sergio +2 more
Context. Globular clusters in the Milky Way are thought to have either an in situ origin, or to have been deposited in the Galaxy by past accretion events, like the spectacular Sagittarius dwarf galaxy merger.
Aims: We probe the origin of the recently discovered globular cluster FSR 1758, often associated with some past merger event and which…
Benford's law in the Gaia universe
de Bruijne, Jos; de Jong, Jurjen; De Ridder, Joris
Context. Benford's law states that for scale- and base-invariant data sets covering a wide dynamic range, the distribution of the first significant digit is biased towards low values. This has been shown to be true for wildly different datasets, including financial, geographical, and atomic data. In astronomy, earlier work showed that Benford's la…
The GRAVITY young stellar object survey. III. The dusty disk of RY Lup
Genzel, R.; Sturm, E.; Ménard, F. +55 more
Context. Studies of the dust distribution, composition, and evolution of protoplanetary disks provide clues for understanding planet formation. However, little is known about the innermost regions of disks where telluric planets are expected to form.
Aims: We aim constrain the geometry of the inner disk of the T Tauri star RY Lup by combining…