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Testing for Dark Matter in the Outskirts of Globular Clusters
Grillmair, Carl J.; Carlberg, Raymond G.
The proper motions of stars in the outskirts of globular clusters are used to estimate cluster velocity dispersion profiles as far as possible within their tidal radii. We use individual color-magnitude diagrams to select high-probability cluster stars for 25 metal-poor globular clusters within 20 kpc of the Sun, 19 of which have substantial numbe…
KMT-2018-BLG-1743: planetary microlensing event occurring on two source stars
Han, Cheongho; Lee, Chung-Uk; Zang, Weicheng +18 more
Aims: We present the analysis of the microlensing event KMT-2018-BLG-1743. The analysis was conducted as a part of the project, in which previous lensing events detected in and before the 2019 season by the KMTNet survey were reinvestigated with the aim of finding solutions of anomalous events with no suggested plausible models.
Methods:…
Blanco DECam Bulge Survey (BDBS). III. A new view of the double red clump in the Milky Way bulge through luminosity and color distribution
Rich, R. M.; Vivas, A. K.; Pilachowski, C. A. +9 more
Red clump (RC) stars are one of the best stellar tracers of the structure of the Milky Way (MW) bulge. Here we report a new view of the double RC through luminosity and color distributions of RC stars in nine bulge fields (l = 0.0°, ±4.5°; b = -6.0°, -7.5°, -9.0°) from the Blanco DECam Bulge Survey (BDBS), which covers near-ultraviolet to near-inf…
Flux Transfer Events at a Reconnection Suppressed Magnetopause: Cassini Observations at Saturn
Coates, Andrew J.; Fuselier, Stephen A.; Slavin, James A. +5 more
We present the discovery of seven new flux transfer events (FTEs) at Saturn's dayside magnetopause by the Cassini spacecraft and analyze the observations of all eight known FTEs. We investigate how FTEs may differ at Saturn where the magnetopause conditions are likely to diamagnetically suppress magnetic reconnection from occurring. The measured i…
An In Situ Study of Turbulence near Stellar Bow Shocks
Chatterjee, Shami; Dolch, Timothy; Cordes, James M. +1 more
Stellar bow shocks are observed in a variety of interstellar environments and shaped by the conditions of gas in the interstellar medium (ISM). In situ measurements of turbulent density fluctuations near stellar bow shocks are only achievable with a few observational probes, including Hα-emitting bow shocks and the Voyager Interstellar Mission (VI…
The local dark sector
Rhodes, Jason; Bergé, Joel; Pernot-Borràs, Martin +18 more
We speculate on the development and availability of new innovative propulsion techniques in the 2040s, that will allow us to fly a spacecraft outside the Solar System (at 150 AU and more) in a reasonable amount of time, in order to directly probe our (gravitational) Solar System neighborhood and answer pressing questions regarding the dark sector …
Variation of the core lifetime and fragmentation scale in molecular clouds as an indication of ambipolar diffusion
André, Philippe; Das, Indrani; Basu, Shantanu
Ambipolar diffusion likely plays a pivotal role in the formation and evolution of dense cores in weakly ionized molecular clouds. Linear analyses show that the evolutionary times and fragmentation scales are significantly greater than the hydrodynamic (Jeans) values even for clouds with mildly supercritical mass-to-flux ratios. We use values of fr…
Absorption-selected galaxies trace the low-mass, late-type, star-forming population at z 2-3
Valentino, F.; Fynbo, J. P. U.; Christensen, L. +5 more
We report on the stellar content, half-light radii and star formation rates of a sample of 10 known high-redshift (z ≳ 2) galaxies selected on strong neutral hydrogen (H I) absorption ($\log ({\rm N_{H\, \rm {I}}\: /\: cm}^{-2})\,\gt\, 19$) towards background quasars. We use observations from the Hubble Space Telescope Wide Field Camera 3 in three…
Resolved spectral variations of the centimetre-wavelength continuum from the ρ Oph W photodissociation region
Hensley, Brandon; Casassus, Simon; White, Glenn J. +5 more
Centimetre-wavelength radio continuum emission in excess of free-free, synchrotron, and Rayleigh-Jeans dust emission (excess microwave emission, EME), and often called 'anomalous microwave emission', is bright in molecular cloud regions exposed to UV radiation, i.e. in photodissociation regions (PDRs). The EME correlates with infrared (IR) dust em…
The relationship between gas and galaxies at z < 1 using the Q0107 quasar triplet
Tejos, Nicolas; Beckett, Alexander; Morris, Simon L. +5 more
We study the distribution and dynamics of the circumgalactic and intergalactic medium using a dense galaxy survey covering the field around the Q0107 system, a unique z ≈ 1 projected quasar triplet. With full Ly α coverage along all three lines-of-sight from z = 0.18 to z = 0.73, more than 1200 galaxy spectra, and two MUSE fields, we examine the s…