Search Publications
Fast Magnetosonic Waves and Flows in a Solar Prominence Foot: Observations and Modeling
Ofman, Leon; Kucera, Therese A.
We study recent observations of propagating fluctuations in a prominence foot with Hinode Solar Optical Telescope (SOT) high-resolution observations in Ca II and Hα emission, which we identify as nonlinear fast magnetosonic waves. Here we analyze further the observations of propagating waves and flows with Interface Region Imaging Spectrograph Mg …
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…
Gaia DR2 Distances to Planetary Nebulae
Manteiga, Minia; Dafonte, Carlos; Manchado, Arturo +2 more
The aim of this work is to examine distances to planetary nebulae (PNe) together with other properties that were derived from them, using the astrometry of Gaia Data Release 2 (DR2). We were able to identify 1571 objects classified as PNe, for which we assumed distances calculated following a Bayesian statistical approach. From those objects, we s…
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…
Global maps of Venus nightside mean infrared thermal emissions obtained by VIRTIS on Venus Express
Drossart, P.; Piccioni, G.; Grassi, D. +6 more
One of the striking features about Venus atmosphere is its temporal variability and dynamics, with a chaotic polar vortex, large-scale atmospheric waves, sheared features and variable winds that depend on local time and possibly orographic features. The aim of this research is to combine data accumulated over several years and obtain a global mean…
The absolute magnitudes MJ, the binary fraction, and the binary mass ratios of M7-M9.5 dwarfs
Warren, S. J.; Laithwaite, R. C.
We use the large homogeneous sample of late M dwarfs, M7-M9.5, of Ahmed & Warren (2019) matched to Gaia DR2, to measure the relation between absolute magnitude and spectral type, and to infer the multiplicity fraction of the population, and the distribution of mass ratios in the binary systems. Binaries are identified photometrically as overlu…
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…
Orbits and Structure of the Quadruple Systems GJ 225.1 and FIN 332
Tokovinin, A.
Only a handful of quadruple systems with two accurate inner visual orbits are known. The architecture of two such systems is studied here to determine the period ratios, mutual orbit orientation, and other parameters; updated orbital elements and their errors are derived. Gliese 225.1 (HIP 28442) is composed of three K-type and one M-type dwarfs a…
Gaia: The Galaxy in six (and more) dimensions
Pancino, Elena
The ESA cornerstone mission Gaia was successfully launched in 2013, and is now scanning the sky to accurately measure the positions and motions of about two billion point-like sources of 3 ≲ V ≲ 20.5 mag, with the main goal of reconstructing the 6D phase space structure of the Milky Way. The typical uncertainties in the astrometry will be in the r…
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…