Search Publications
Satellite group infall into the Milky Way: Exploring the Crater-Leo case with new HST proper motions
van der Marel, Roeland P.; Pawlowski, Marcel S.; Júlio, Mariana P. +3 more
Context. Within Λ cold dark matter (ΛCDM) simulations, Milky Way-like galaxies accrete some of their satellite galaxies in groups of 3–5 members rather than individually, and this has been suggested as a possible mechanism driving the formation of satellite planes. Objects accreted in groups are expected to share similar specific total energy and …
The JWST/NIRISS Deep Spectroscopic Survey for Young Brown Dwarfs and Free-floating Planets
Johnstone, Doug; Albert, Loïc; Doyon, René +9 more
The discovery and characterization of free-floating planetary-mass objects (FFPMOs) is fundamental to our understanding of star and planet formation. Here we report results from an extremely deep spectroscopic survey of the young star cluster NGC1333 using Near-InfraRed Imager and Slitless Spectrograph (NIRISS) wide field slitless spectroscopy on …
Inferring Fundamental Properties of the Flare Current Sheet Using Flare Ribbons: Oscillations in the Reconnection Flux Rates
Kazachenko, Maria D.; Lynch, Benjamin J.; Corchado Albelo, Marcel F.
Magnetic reconnection is understood to be the main physical process that facilitates the transformation of magnetic energy into heat, motion, and particle acceleration during solar eruptions. Yet, observational constraints on reconnection region properties and dynamics are limited due to a lack of high-cadence and high-spatial-resolution observati…
El Gordo needs El Anzuelo: Probing the structure of cluster members with multi-band extended arcs in JWST data
Caminha, G. B.; Suyu, S. H.; Galan, A. +2 more
Gravitational lensing by galaxy clusters involves hundreds of galaxies over a large redshift range and increases the likelihood of rare phenomena (supernovae, microlensing, dark substructures, etc.). Characterizing the mass and light distributions of foreground and background objects often requires a combination of high-resolution data and advance…
SRG/ART-XC all-sky X-ray survey: Catalog of sources detected during the first five surveys
Sunyaev, R.; Krivonos, R.; Sazonov, S. +27 more
We present an updated catalog of sources detected by the Mikhail Pavlinsky ART-XC telescope aboard the Spektrum-Roentgen-Gamma (SRG) observatory during its all-sky survey. It is based on the data of the first four and the partially completed fifth scans of the sky (ARTSS1-5). The catalog comprises 1545 sources detected in the 4-12 keV energy band.…
Improved constraints on Galactic Centre ejection of hypervelocity stars based on novel search method
Tohill, Clár-Bríd; Kuijken, Konrad; Koposov, Sergey E. +6 more
Hypervelocity stars (HVSs) are stars which have been ejected from the Galactic Centre (GC) at velocities of up to a few thousand
Identification of new nearby white dwarfs using Gaia DR3
Reffert, Sabine; Golovin, Alex; Vani, Akash +3 more
Context. A volume-complete sample of white dwarfs is essential for statistical studies of the white dwarf population. The sample of nearby white dwarfs is the only one that allows the faint end of the luminosity function to be probed and thus is the only one that covers the entire range of white dwarf ages. However, due to their intrinsic faintnes…
The IACOB project. XI. No increase in mass-loss rates over the bistability region
Simón-Díaz, S.; Urbaneja, M. A.; de Burgos, A. +1 more
The properties of blue supergiants are key for constraining the end of the main sequence (MS) of massive stars. Whether the observed drop in the relative number of fast-rotating stars below ≈21 kK is due to enhanced mass-loss rates at the location of the bistability jump, or the result of the end of the MS is still debated. Here, we combine newly …
First Observational Evidence for an Interconnected Evolution between Time Lag and QPO Frequency among AGNs
Liu, Hao; Xue, Yongquan; Xia, Ruisong
Quasiperiodic oscillations (QPOs) have been widely observed in black hole X-ray binaries (BHBs), which often exhibit significant X-ray variations. Extensive research has explored the long-term evolution of the properties of QPOs in BHBs. In contrast, such evolution in active galactic nuclei (AGNs) has remained largely unexplored due to limited obs…
SMA Detection of an Extreme Millimeter Flare from the Young Class III Star HD 283572
Wilner, David J.; Rao, Ramprasad; Andrews, Sean M. +5 more
We present evidence of variable 1.3 mm emission from the 1 to 3 Myr, spectral-type G2–G5 class III young stellar object (YSO), HD 283572. HD 283572 was observed on eight dates with the Submillimeter Array between 2021 December and 2023 May, with a total on-source time of 10.2 hr, probing a range of timescales down to 5.2 s. Averaging all data obta…