Search Publications
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…
Fundamental parameters of the Ap-stars GO And, 84 UMa, and κ Psc
Sitnova, T. M.; Romanovskaya, A. M.; Ryabchikova, T. A. +1 more
Aims: The aim of this work is to determine fundamental parameters of three Ap stars, GO And (HD 4778), κ Psc (HD 220825), and 84 UMa (HD 120198), using spectroscopic techniques. By analysing these stars, we complete the sample of Ap stars for which fundamental parameters have additionally been derived by means of interferometry. This enables …
A nonlinear solar magnetic field calibration method for the filter-based magnetograph by the residual network
Ji, Kaifan; Su, Jiangtao; Deng, Yuanyong +6 more
Context. The method of solar magnetic field calibration for the filter-based magnetograph is normally the linear calibration method under weak-field approximation that cannot generate the strong magnetic field region well due to the magnetic saturation effect.
Aims: We try to provide a new method to carry out the nonlinear magnetic calibratio…
Infrared photometry and CaT spectroscopy of globular cluster M 28 (NGC 6626)
Minniti, D.; Zoccali, M.; Contreras Ramos, R. +12 more
Context. Recent studies show that the inner Galactic regions host genuine bulge globular clusters, but also halo intruders, complex remnants of primordial building blocks, and objects likely accreted during major merging events.
Aims: In this study we focus on the properties of M 28, a very old and massive cluster currently located in the Gal…
Investigation on the spatiotemporal structures of supra-arcade spikes
Wang, Yuming; Liu, Rui
Context. The vertical current sheet (VCS) trailing coronal mass ejections (CMEs) is the key place at which the flare energy release and the CME buildup take place through magnetic reconnection. The VCS is often studied from the edge-on perspective for the morphological similarity with the two-dimensional "standard" picture, but its three-dimension…
First black hole mass estimation for the quadruple lensed system WGD2038-4008
Assef, R. J.; Godoy, N.; Mediavilla, E. +6 more
Context. The quadruple lensed system WGD2038-4008 (zs = 0.777 ± 0.001) has recently been discovered with the help of new techniques and observations. Black hole masses have been estimated for lensed quasars, but they have mostly been calculated for one broad emission line of one image. However, the images could be affected by microlensi…