Search Publications
A near-infrared interferometric survey of debris-disk stars. VII. The hot-to-warm dust connection
Absil, O.; Augereau, J. -C.; Ertel, S. +10 more
Context. Hot exozodiacal dust has been shown to be present in the innermost regions of an increasing number of main sequence stars over the past 15 yr. However, the origin of hot exozodiacal dust and its connection with outer dust reservoirs remains unclear.
Aims: We aim to explore the possible connection between hot exozodiacal dust and warm…
Black Hole and Galaxy Coevolution in Moderately Luminous Active Galactic Nuclei at z ∼ 1.4 in SXDF
Ueda, Yoshihiro; Toba, Yoshiki; Akiyama, Masayuki +1 more
We investigate the relation of black hole mass versus host stellar mass and that of mass accretion rate versus star formation rate (SFR) in moderately luminous ( $\mathrm{log}{L}_{\mathrm{bol}}\sim 44.5\mbox{--}46.5\ \mathrm{erg}\,{{\rm{s}}}^{-1}$ <!-- --> ), X-ray selected broad-line active galactic nuclei (AGNs) at z = 1.18-1.68 in the Sub…
Narrowband Observations of Comet 46P/Wirtanen during Its Exceptional Apparition of 2018/19. I. Apparent Rotation Period and Outbursts
Skiff, Brian A.; Feaga, Lori M.; Schleicher, David G. +4 more
We obtained broad- and narrowband images of the hyperactive comet 46P/Wirtanen on 33 nights during its 2018/2019 apparition, when the comet made a historic close approach to the Earth. With our extensive coverage, we investigated the temporal behavior of the comet on both seasonal and rotational timescales. We used CN observations to explore the c…
The NuSTAR extragalactic survey of the James Webb Space Telescope North Ecliptic Pole time-domain field
Alexander, D. M.; Cappelluti, N.; Gandhi, P. +17 more
We present the NuSTAR extragalactic survey of the James Webb Space Telescope (JWST) North Ecliptic Pole (NEP) Time-Domain Field. The survey covers a ~0.16 deg2 area with a total exposure of 681 ks acquired in a total of nine observations from three epochs. The survey sensitivities at 20 per cent of the area are 2.39, 1.14, 2.76, 1.52, a…
Investigating Clumpy Galaxies in the Sloan Digital Sky Survey Stripe 82 Using the Galaxy Zoo
Charlot, Stéphane; Chevallard, Jacopo; Scarlata, Claudia +7 more
Giant, star-forming clumps are a common feature prevalent among high-redshift star-forming galaxies and play a critical role in shaping their chaotic morphologies and yet, their nature and role in galaxy evolution remains to be fully understood. A majority of the effort to study clumps has been focused at high redshifts, and local clump studies ha…
The nature of giant clumps in high-z discs: a deep-learning comparison of simulations and observations
Snyder, Gregory; Dekel, Avishai; Primack, Joel +4 more
We use deep learning to explore the nature of observed giant clumps in high-redshift disc galaxies, based on their identification and classification in cosmological simulations. Simulated clumps are detected using the 3D gas and stellar densities in the VELA zoom-in cosmological simulation suite, with ${\sim}25\ \rm {pc}$ maximum resolution, targe…
Fifty Years of 3 He-rich Events
Reames, Donald V.
The early 1970s saw a new and surprising feature in the composition of solar energetic particles (SEPs), resonant enhancements up to 10,000-fold in the ratio 3He/4He that could even make 3He dominant over H in rare events. It was soon learned that these events also had enhancements in the abundances of heavier elements, such as a factor of ~10 enh…
Uncovering fossils of the distant Milky Way with UNIONS: NGC 5466 and its stellar stream
Jensen, Jaclyn; McConnachie, Alan W.; Cuillandre, Jean-Charles +9 more
We examine the spatial clustering of blue horizontal branch (BHB) stars from the u-band of the Canada-France Imaging Survey (CFIS, a component of the Ultraviolet Near-Infrared Optical Northern Survey, or UNIONS). All major groupings of stars are associated with previously known satellites, and among these is NGC 5466, a distant (16 kpc) globular c…
Connecting solar flare hard X-ray spectra to in situ electron spectra. A comparison of RHESSI and STEREO/SEPT observations
Klein, K. -L.; Dresing, N.; Warmuth, A. +4 more
Aims: We aim to constrain the acceleration, injection, and transport processes of flare-accelerated energetic electrons by comparing their characteristics at the Sun with those injected into interplanetary space.
Methods: We have identified 17 energetic electron events well-observed with the SEPT instrument aboard STEREO which show a cle…
Clumpiness of observed and simulated cold circumgalactic gas
Hamanowicz, Aleksandra; Zanella, Anita; Péroux, Céline +3 more
Determining the clumpiness of matter around galaxies is pivotal to a full understanding of the spatially inhomogeneous, multiphase gas in the circumgalactic medium (CGM). We combine high spatially resolved 3D observations with hydrodynamical cosmological simulations to measure the cold circumgalactic gas clumpiness. We present new adaptive-optics-…