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Quenched fractions in the IllustrisTNG simulations: comparison with observations and other theoretical models
Vogelsberger, Mark; Pillepich, Annalisa; Nelson, Dylan +3 more
We make an in-depth comparison of the IllustrisTNG cosmological simulations with observed quenched fractions of central and satellite galaxies, for Mstars = 109-12 M⊙ at 0 ≤ z ≤ 3. We show how measurement choices [aperture, quenched definition, and star formation rate (SFR) indicator time-scale], as well as sample …
Charting the Galactic Acceleration Field. I. A Search for Stellar Streams with Gaia DR2 and EDR3 with Follow-up from ESPaDOnS and UVES
Bianchini, Paolo; Martin, Nicolas; Malhan, Khyati +10 more
We present maps of the stellar streams detected in the Gaia Data Release 2 (DR2) and Early Data Release 3 (EDR3) catalogs using the STREAMFINDER algorithm. We also report the spectroscopic follow-up of the brighter DR2 stream members obtained with the high-resolution CFHT/ESPaDOnS and VLT/UVES spectrographs as well as with the medium-resolution NT…
The Field Substellar Mass Function Based on the Full-sky 20 pc Census of 525 L, T, and Y Dwarfs
Gonzales, Eileen C.; Kiman, Rocio; Meisner, Aaron M. +50 more
We present final Spitzer trigonometric parallaxes for 361 L, T, and Y dwarfs. We combine these with prior studies to build a list of 525 known L, T, and Y dwarfs within 20 pc of the Sun, 38 of which are presented here for the first time. Using published photometry and spectroscopy as well as our own follow-up, we present an array of color-magnitud…
The Evolutionary Map of the Universe pilot survey
Reiprich, Thomas H.; Koribalski, Bärbel S.; Norris, Ray P. +45 more
We present the data and initial results from the first pilot survey of the Evolutionary Map of the Universe (EMU), observed at 944 MHz with the Australian Square Kilometre Array Pathfinder (ASKAP) telescope. The survey covers $270 deg^2$ of an area covered by the Dark Energy Survey, reaching a depth of 25-30 $µJy beam^{-1}$ rms at a spatial …
Six transiting planets and a chain of Laplace resonances in TOI-178
Alonso, R.; Bouchy, F.; Deleuil, M. +152 more
Determining the architecture of multi-planetary systems is one of the cornerstones of understanding planet formation and evolution. Resonant systems are especially important as the fragility of their orbital configuration ensures that no significant scattering or collisional event has taken place since the earliest formation phase when the parent …
Galaxy Stellar Mass Functions from z 10 to z 6 using the Deepest Spitzer/Infrared Array Camera Data: No Significant Evolution in the Stellar-to-halo Mass Ratio of Galaxies in the First Gigayear of Cosmic Time
Illingworth, Garth D.; Labbé, Ivo; Bouwens, Rychard J. +3 more
We present new stellar mass functions at z ~ 6, z ~ 7, z ~ 8, z ~ 9 and, for the first time, z ~ 10, constructed from ~800 Lyman-break galaxies previously identified over the eXtreme Deep Field and Hubble Ultra-Deep Field parallel fields and the five Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey fields. Our study is distinctive du…
Molecules with ALMA at Planet-forming Scales (MAPS). V. CO Gas Distributions
Zhang, Ke; Wilner, David J.; Ménard, François +32 more
Here we present high-resolution (15-24 au) observations of CO isotopologue lines from the Molecules with ALMA on Planet-forming Scales (MAPS) ALMA Large Program. Our analysis employs observations of the (J = 2-1) and (1-0) lines of 13CO and C18O and the (J = 1-0) line of C17O for five protoplanetary disks. We retri…
Ionized outflows from active galactic nuclei as the essential elements of feedback
Veilleux, Sylvain; Reynolds, Christopher S.; Guainazzi, Matteo +5 more
Outflows from active galactic nuclei (AGNs) are one of the fundamental mechanisms by which the central supermassive black hole interacts with its host galaxy. Detected in ≥50% of nearby AGNs, these outflows have been found to carry kinetic energy that is a large fraction of the AGN power, and thereby give `negative' feedback to their host galaxies…
Atacama Cosmology Telescope: Combined kinematic and thermal Sunyaev-Zel'dovich measurements from BOSS CMASS and LOWZ halos
Hilton, Matt; Sifón, Cristóbal; Battaglia, Nicholas +56 more
The scattering of cosmic microwave background (CMB) photons off the free-electron gas in galaxies and clusters leaves detectable imprints on high resolution CMB maps: the thermal and kinematic Sunyaev-Zel'dovich effects (tSZ and kSZ respectively). We use combined microwave maps from the Atacama Cosmology Telescope DR5 and Planck in combination wit…
First Multimessenger Observations of a Neutron Star Merger
Chornock, Ryan; Margutti, Raffaella
We describe the first observations of the same celestial object with gravitational waves and light. GW170817 was the first detection of a neutron star merger with gravitational waves. The detection of a spatially coincident weak burst of gamma-rays (GRB 170817A) 1.7 s after the merger constituted the first electromagnetic detection of a gravitatio…