Search Publications
An observationally derived kick distribution for neutron stars in binary systems
Strader, Jay; Bahramian, Arash; Miller-Jones, James C. A. +5 more
Understanding the natal kicks received by neutron stars (NSs) during formation is a critical component of modelling the evolution of massive binaries. Natal kicks are an integral input parameter for population synthesis codes, and have implications for the formation of double NS systems and their subsequent merger rates. However, many of the stand…
GOALS-JWST: Revealing the Buried Star Clusters in the Luminous Infrared Galaxy VV 114
Inami, Hanae; Böker, Torsten; Kemper, Francisca +30 more
We present the results of a James Webb Space Telescope NIRCam investigation into the young massive star cluster (YMC) population in the luminous infrared galaxy VV 114. We identify 374 compact YMC candidates with signal-to-noise ratios ≥ 3, 5, and 5 at F150W, F200W, and F356W, respectively. A direct comparison with our HST cluster catalog reveals …
A 7 Day Multiwavelength Flare Campaign on AU Mic. I. High-time-resolution Light Curves and the Thermal Empirical Neupert Effect
Notsu, Yuta; Kowalski, Adam F.; Tristan, Isaiah I. +13 more
We present light curves and flares from a 7 day, multiwavelength observational campaign of AU Mic, a young and active dM1e star with exoplanets and a debris disk. We report on 73 unique flares between the X-ray to optical data. We use high-time-resolution near-UV (NUV) photometry and soft X-ray (SXR) data from the X-ray Multi-Mirror Mission to stu…
Differential reddening in the direction of 56 Galactic globular clusters
Milone, A. P.; Cordoni, G.; Marino, A. F. +6 more
The presence of differential reddening in the direction of Galactic globular clusters (GCs) has proven to be a serious limitation in the traditional colour-magnitude diagram (CMD) analysis. Here, we estimate local reddening variations in the direction of 56 Galactic GCs. To do that, we use the public catalogues derived as part of the Hubble Space …
Spiral-like features in the disc revealed by Gaia DR3 radial actions
Recio-Blanco, A.; Antoja, T.; McMillan, P. J. +3 more
Context. The so-called action variables are specific functions of the positions and velocities that remain constant along the stellar orbit. The astrometry provided by Gaia Early Data Release 3 (EDR3), combined with the velocities inferred from the Radial Velocity Spectrograph (RVS) spectra of Gaia DR3, allows for the estimation of these actions f…
X-ray polarization evidence for a 200-year-old flare of Sgr A*
Ingram, Adam; Kaaret, Philip; Wu, Kinwah +101 more
The centre of the Milky Way Galaxy hosts a black hole with a solar mass of about 4 million (Sagittarius A* (Sgr A)) that is very quiescent at present with a luminosity many orders of magnitude below those of active galactic nuclei1. Reflection of X-rays from Sgr A* by dense gas in the Galactic Centre region offers …
Multiple Stellar Populations in Metal-poor Globular Clusters with JWST: A NIRCam View of M92
Vesperini, Enrico; Lagioia, Edoardo P.; Marino, Anna F. +10 more
Recent work on metal-intermediate globular clusters (GCs) with [Fe/H] = -1.5 and -0.75 has illustrated the theoretical behavior of multiple populations in photometric diagrams obtained with the JWST. These results are confirmed by observations of multiple populations among the M dwarfs of 47 Tucanae. Here we explore multiple populations in metal-p…
SRG/eROSITA X-ray shadowing study of giant molecular clouds
Ponti, G.; Freyberg, M. J.; Sasaki, M. +3 more
Context. SRG/eROSITA is situated in a halo orbit around L2 where the highly variable solar wind charge exchange (SWCX) emission from Earth's magnetosheath is expected to be negligible. The soft X-ray foreground emissions from the local hot bubble (LHB) and the remaining heliospheric SWCX emissions could be studied in unprecedented detail with eROS…
New insights on the near-infrared veiling of young stars using CFHT/SPIRou data
Carmona, A.; Donati, J. -F.; Doyon, R. +9 more
Context. Veiling is ubiquitous at different wavelength ranges in classical T Tauri stars. However, the origin of the veiling in the infrared (IR) domain is not well understood at present. The accretion spot alone is not enough to explain the shallow photospheric IR lines in accreting systems, suggesting that another source is contributing to the v…
WISDOM project - XIV. SMBH mass in the early-type galaxies NGC 0612, NGC 1574, and NGC 4261 from CO dynamical modelling
Williams, Thomas G.; Sarzi, Marc; Cappellari, Michele +9 more
We present a CO dynamical estimate of the mass of the supermassive black hole (SMBH) in three nearby early-type galaxies: NGC 0612, NGC 1574, and NGC 4261. Our analysis is based on Atacama Large Millimeter/submillimeter Array (ALMA) Cycle 3-6 observations of the 12CO(2-1) emission line with spatial resolutions of 14-58 pc (0.01″-0.26″).…