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The ALPINE-ALMA [CII] survey. The contribution of major mergers to the galaxy mass assembly at z ∼ 5
Cimatti, A.; Rodighiero, G.; Schaerer, D. +25 more
Context. Galaxy mergers are thought to be one of the main mechanisms of the mass assembly of galaxies in the Universe, but there is still little direct observational evidence of how frequent they are at z ≳ 4. Recently, many works have suggested a possible increase in the fraction of major mergers in the early Universe, reviving the debate on whic…
The search for failed supernovae with the Large Binocular Telescope: N6946-BH1, still no star
Kochanek, C. S.; Stanek, K. Z.; Dai, X. +2 more
We present new Large Binocular Telescope, Hubble Space Telescope, and Spitzer Space Telescope data for the failed supernova candidate N6946-BH1. We also report an unsuccessful attempt to detect the candidate with Chandra. The ~300 000 $\, \mathrm{L}_\odot$ red supergiant progenitor underwent an outburst in 2009 and has since disappeared in the opt…
An unusually low density ultra-short period super-Earth and three mini-Neptunes around the old star TOI-561
Scandariato, G.; Pagano, I.; Winn, J. N. +38 more
Based on HARPS-N radial velocities (RVs) and TESS photometry, we present a full characterization of the planetary system orbiting the late G dwarf TOI-561. After the identification of three transiting candidates by TESS, we discovered two additional external planets from RV analysis. RVs cannot confirm the outer TESS transiting candidate, which wo…
Gaia Early Data Release 3. Modelling and calibration of Gaia's point and line spread functions
Mora, A.; Evans, D. W.; Brown, A. G. A. +18 more
Context. The unprecedented astrometric precision of the Gaia mission relies on accurate estimates of the locations of sources in the Gaia data stream. This is ultimately performed by point spread function (PSF) fitting, which in turn requires an accurate reconstruction of the PSF, including calibrations of all the major dependences. These include …
On the Observational Difference between the Accretion Disk-Corona Connections among Super- and Sub-Eddington Accreting Active Galactic Nuclei
Brandt, W. N.; Luo, B.; Gallagher, S. C. +5 more
We present a systematic X-ray and multiwavelength study of a sample of 47 active galactic nuclei (AGNs) with reverberation mapping measurements. This sample includes 21 super-Eddington accreting AGNs and 26 sub-Eddington accreting AGNs. Using high-state observations with simultaneous X-ray and UV/optical measurements, we investigate whether super-…
Does the Magnetic Field Suppress Fragmentation in Massive Dense Cores?
Ching, Tao-Chung; Qiu, Keping; Chen, Huei-Ru Vivien +15 more
Theoretical and numerical works indicate that a strong magnetic field should suppress fragmentation in dense cores. However, this has never been tested observationally in a relatively large sample of fragmenting massive dense cores. Here, we use the polarization data obtained in the Submillimeter Array Legacy Survey of Zhang et al. to build a samp…
X-Ray Superflares from Pre-main-sequence Stars: Flare Energetics and Frequency
Feigelson, Eric D.; Getman, Konstantin V.
Solar-type stars exhibit their highest levels of magnetic activity during their early convective pre-main-sequence (PMS) phase of evolution. The most powerful PMS flares, superflares and megaflares, have peak X-ray luminosities of $\mathrm{log}({L}_{{\rm{X}}})=30.5\mbox{-}34.0$ erg s-1 and total energies $\mathrm{log}({E}_{{\rm{X}}})=34…
Galaxy Evolution in All Five CANDELS Fields and IllustrisTNG: Morphological, Structural, and the Major Merger Evolution to z 3
Conselice, C. J.; Duncan, K.; Whitney, A. +1 more
A fundamental feature of galaxies is their structure, yet we are just now understanding the evolution of structural properties in quantitative ways. As such, we explore the quantitative nonparametric structural evolution of 16,778 galaxies up to z ~ 3 in all five CANDELS fields, the largest collection of high-resolution images of distant galaxies …
Probing the nature of dark matter with accreted globular cluster streams
Malhan, Khyati; Valluri, Monica; Freese, Katherine
The steepness of the central density profiles of dark matter (DM) in low-mass galaxy haloes (e.g. dwarf galaxies) is a powerful probe of the nature of DM. We propose a novel scheme to probe the inner profiles of galaxy subhaloes using stellar streams. We show that the present-day morphological and dynamical properties of accreted globular cluster …
A circular polarization survey for radio stars with the Australian SKA Pathfinder
Kaplan, David L.; Lenc, Emil; Pritchard, Joshua +14 more
We present results from a circular polarization survey for radio stars in the Rapid ASKAP Continuum Survey (RACS). RACS is a survey of the entire sky south of δ = +41○ being conducted with the Australian Square Kilometre Array Pathfinder telescope (ASKAP) over a 288 MHz wide band centred on 887.5 MHz. The data we analyse include Stokes …