Search Publications
The host galaxy of the short GRB 050709
Magnelli, B.; Palazzi, E.; Greiner, J. +10 more
The host of the short gamma-ray burst (GRB) 050709 is a morphologically disturbed low-luminous galaxy. At a redshift of z = 0.16, it belongs to one of the cosmologically nearest short-GRB hosts identified to date. Consequently, it represents a promising target for sensitive, spatially resolved observational studies. We have used the Multi Unit Spe…
The Gaia RVS benchmark stars. I. Chemical inventory of the first sample of evolved stars and its Rb NLTE investigation
Steffen, M.; Ludwig, H. -G.; Bonifacio, P. +21 more
Context. The Radial Velocity Spectrometer (RVS) on board the Gaia satellite is not provided with a wavelength calibration lamp. It uses its observations of stars with known radial velocity to derive the dispersion relation. To derive an accurate radial velocity calibration, a precise knowledge of the line spread function (LSF) of the RVS is necess…
The orbits of Triton and Nereid and the pole orientation of Neptune from Voyager, Hubble Space Telescope, and Earth-based astrometry in 1847-2020
Fu, Yanning; Yuan, Ye; Chen, Jian +1 more
Context. New observations and new planetary and satellite ephemerides provide opportunities to improve the ephemerides for Triton and Nereid as well as relevant parameters. In particular, the observations include a lot of new accurate Earth-based positions reduced with Gaia astrometic catalogs and accurate positions obtained from Hubble Space Tele…
The contribution by luminous blue variable stars to the dust content of the Magellanic Clouds
Asmus, D.; Mehner, A.; de Wit, W. -J. +6 more
Context. Previous studies have concluded that low- and intermediate-mass stars cannot account for the interstellar dust yield in the Magellanic Clouds inferred from far-infrared and sub-millimetre observations.
Aims: Luminous blue variable stars (LBVs) form dust as a result of episodic, violent mass loss. To investigate their contribution as …
Detection of coherent low-frequency radio bursts from weak-line T Tauri stars
Feeney-Johansson, A.; Purser, S. J. D.; Ray, T. P. +7 more
In recent years, thanks to new facilities such as LOFAR that are capable of sensitive observations, much work has been done on the detection of stellar radio emission at low frequencies. Such emission has commonly been shown to be coherent emission, generally attributed to electron-cyclotron maser (ECM) emission, and has usually been detected from…
A puzzling non-detection of [O III] and [C II] from a z ≈ 7.7 galaxy observed with ALMA
Taniguchi, Y.; Umehata, H.; Zackrisson, E. +12 more
Context. Characterizing the galaxy population in the early Universe holds the key to understanding the evolution of these objects and the role they played in cosmic reionization. However, there have been very few observations at the very highest redshifts to date.
Aims: In order to shed light on the properties of galaxies in the high-redshift…
The effect of thermal conductivity on the outgassing and local gas dynamics from cometary nuclei
Thomas, N.; Marschall, R.; Gerig, S. -B. +3 more
Aims: The aim of this work is to investigate the parameters influencing the generation of the inner comae of a comet with a spherical nucleus and to model the gas activity distribution around its nuclei. Here, we investigate the influence of thermal conductivity combined with sub-surface H2O and CO2-ice sources on insola…
Active galactic nuclei catalog from the AKARI NEP-Wide field
Goto, Tomotsugu; Kim, Seong Jin; Ho, Simon C. -C. +12 more
Context. The north ecliptic pole (NEP) field provides a unique set of panchromatic data that are well suited for active galactic nuclei (AGN) studies. The selection of AGN candidates is often based on mid-infrared (MIR) measurements. Such methods, despite their effectiveness, strongly reduce the breadth of resulting catalogs due to the MIR detecti…
Strongly pulsed thermal X-rays from a single extended hot spot on PSR J2021+4026
Mereghetti, Sandro; Turolla, Roberto; Rigoselli, Michela +2 more
The radio-quiet pulsar PSR J2021+4026 is mostly known because it is the only rotation-powered pulsar that shows variability in its γ-ray emission. Using XMM-Newton archival data, we first confirmed that its flux is steady in the X-ray band, and then we showed that both the spectral and timing X-ray properties, that is to say the narrow pulse profi…
Narrow belt of debris around the Sco-Cen star HD 141011
Pinte, C.; Milli, J.; Menard, F. +22 more
Context. We initiated a deep-imaging survey of Scorpius-Centaurus A-F stars in 2015. These stars are predicted to host warm inner and cold outer belts of debris reminiscent of the architecture of emblematic systems such as HR 8799.
Aims: We present resolved images of a ring of debris around the F5-type star HD 141011 that was observed as part…