Search Publications
VLT/X-shooter spectroscopy of massive young stellar objects in the 30 Doradus region of the Large Magellanic Cloud
Kaper, L.; Sabbi, E.; de Mink, S. E. +13 more
The process of massive star (M ≥ 8 M⊙) formation is still poorly understood. Observations of massive young stellar objects (MYSOs) are challenging due to their rarity, short formation timescale, large distances, and high circumstellar extinction. Here, we present the results of a spectroscopic analysis of a population of MYSOs in the La…
Relations between Coronal Mass Ejections and the Photospheric Magnetic Field in Cycles 23 and 24
Bilenko, Irina A.
The number of coronal mass ejections (CMEs) and their parameters and cycle variations were investigated and compared to the photospheric magnetic field evolution in cycles 23 and 24. The Coordinated Data Analysis Workshops (CDAW) catalog of white-light CMEs detected by the Solar and Heliospheric Observatory/Large Angle and Spectrometric Coronagrap…
Cold gas and dust: Hunting spiral-like structures in early-type galaxies
Duc, P. -A.; Peletier, R. F.; Serra, P. +1 more
Context. Observations of neutral hydrogen (H I) and molecular gas show that 50% of all nearby early-type galaxies contain some cold gas. Molecular gas is always found in small gas discs in the central region of the galaxy, while neutral hydrogen is often distributed in a low-column density disc or ring typically extending well beyond the stellar b…
FEDReD. I. 3D extinction and stellar maps by Bayesian deconvolution
Arenou, F.; Babusiaux, C.; Hottier, C. +2 more
Context. While Gaia enables us to probe the extended local neighbourhood in great detail, the thin disc structure at larger distances remains sparsely explored.
Aims: We aim here to build a non-parametric 3D model of the thin disc structures handling both the extinction and the stellar density simultaneously.
Methods: We developed a Baye…
The absolute proper motions of the Arches and Quintuplet clusters
van der Marel, Roeland P.; Bellini, Andrea; Libralato, Mattia +2 more
Arches and Quintuplet are two young, massive clusters projected near the Galactic Centre. To date, studies focused on understanding their origin have been based on proper motions (PMs) derived in the clusters' reference frames and required some assumptions about their 3D motion. In this paper, we combine public PM catalogues of these clusters with…
Characterizing X-Ray Properties of the Gamma-Ray Pulsar PSR J1418-6058 in the Rabbit Pulsar Wind Nebula
An, Hongjun; Kim, Minjun
We report on X-ray studies of the gamma-ray pulsar PSR J1418-6058 in the Rabbit pulsar wind nebula (PWN) carried out using archival Chandra and XMM-Newton observations. A refined timing analysis performed with the 120 ks XMM-Newton data finds significant (p ≈ 10-7) pulsation at P ≈ 110 ms which is consistent with that measured with the …
A Method for the Estimation of f- and p-mode Parameters and Rotational Splitting Coefficients from Un-averaged Solar Oscillation Power Spectra
Kosovichev, A. G.; Scherrer, P. H.; Larson, T. P. +3 more
We present a new methodology for the fitting of the peaks in solar oscillation power spectra that is equally well-suited for the estimation of low-, medium, and high-degree f- and p-mode parameters and frequency-splitting coefficients. The method can provide accurate input data over a wide portion of the dispersion plane for both structural and ro…
AstroSat UVIT Detections of Chandra X-Ray Sources in M31
Chen, Y.; Leahy, D. A.
An ultraviolet (UV) survey of M31 has been carried out during 2017-19 with the Ultra-Violet Imaging Telescope (UVIT) instrument on board the AstroSat Observatory. Here we match the M31 UVIT source catalog with the Chandra source catalog. We find 67 UVIT/Chandra sources detected in a varying number of UV and X-ray bands. The UV and X-ray photometry…
Impact of a companion and of chromospheric emission on the shape of chromosome maps for globular clusters
Martins, F.; Lardo, C.; Morin, J. +2 more
Context. Globular clusters (GCs) host multiple populations of stars that are well-separated in a photometric diagram - the chromosome map - built from specific Hubble Space Telescope (HST) filters. Stars from different populations feature at various locations on this diagram due to peculiar chemical compositions. Stars of the first population, wit…
Correlation of Structure and Stellar Properties of Galaxies in Stripe 82
Ho, Luis C.; Sachdeva, Sonali; Shankar, Francesco +1 more
Establishing a correlation (or lack thereof) between the bimodal color distribution of galaxies and their structural parameters is crucial to understand the origin of bimodality. To achieve that, we have performed a 2D mass-based structural decomposition (bulge+disk) of all disk galaxies (total = 1263) in the Herschel imaging area of the Stripe 82…