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A universal correlation between warm and hot gas in the stripped tails of cluster galaxies
Yoshida, Michitoshi; Fossati, Matteo; Nulsen, Paul E. J. +7 more
The impact of ram pressure stripping on galaxy evolution is well known (for example, ref. 1). Recent multi-wavelength data have revealed many examples of galaxies undergoing stripping, often accompanied with multi-phase tails2-13. As energy transfer in the multi-phase medium is an outstanding question in astrophysics, galaxie…
Search for associations containing young stars (SACY). VIII. An updated census of spectroscopic binary systems exhibiting hints of non-universal multiplicity among their associations
Bayo, A.; Huélamo, N.; Sterzik, M. F. +10 more
Context. Nearby young associations offer one of the best opportunities for a detailed study of the properties of young stellar and substellar objects thanks to their proximity (<200 pc) and age (∼5-150 Myr). Previous works have identified spectroscopic (<5 au) binaries, close (5-1000 au) visual binaries, and wide or extremely wide (1000-100 …
ARES IV: Probing the Atmospheres of the Two Warm Small Planets HD 106315c and HD 3167c with the HST/WFC3 Camera
Drossart, Pierre; Marcq, Emmanuel; Blain, Doriann +27 more
We present an atmospheric characterization study of two medium-sized planets bracketing the radius of Neptune: HD 106315c (RP = 4.98 ± 0.23 R⊕) and HD 3167c ( ${R}_{{\rm{P}}}={2.740}_{-0.100}^{+0.106}$ R⊕). We analyze spatially scanned spectroscopic observations obtained with the G141 grism (1.125-1.650 µm) o…
Double-peaked Lyman α emission at z = 6.803: a reionization-era galaxy self-ionizing its local H II bubble
Garel, Thibault; Verhamme, Anne; Ellis, Richard S. +2 more
We report the discovery of a double-peaked Lyman α profile in a galaxy at z = 6.803, A370p_z1, in the parallel Frontier Field of Abell 370. The velocity separation between the blue and red peaks of the Lyman α profile ( $\Delta v=101_{-19}^{+38} (\pm 48)\, \rm km\, \rm s^{-1}$ ) suggests an extremely high escape fraction of ionizing photons $\gt 5…
First Simultaneous In Situ Measurements of a Coronal Mass Ejection by Parker Solar Probe and STEREO-A
Lugaz, Noé; Scolini, Camilla; Galvin, Antoinette B. +1 more
We present the first Parker Solar Probe mission (PSP)-observed coronal mass ejection (CME) that hits a second spacecraft before the end of the PSP encounter, providing an excellent opportunity to study short-term CME evolution. The CME was launched from the Sun on 2019 October 10 and was measured in situ at PSP on 2019 October 13 and at STEREO-A o…
White dwarfs with planetary remnants in the era of Gaia - I. Six emission line systems
Pala, A. F.; Marsh, T. R.; Hollands, M. A. +17 more
White dwarfs with emission lines from gaseous debris discs are among the rarest examples of planetary remnant hosts, but at the same time they are key objects for studying the final evolutionary stage of planetary systems. Making use of the large number of white dwarfs identified in Gaia Data Release 2 (DR2), we are conducting a survey of planetar…
Measurement on the cosmic curvature using the Gaussian process method
Gong, Yungui; Yang, Yingjie
Inflation predicts that the Universe is spatially flat. The Planck 2018 measurements of the cosmic microwave background anisotropy favour a spatially closed universe at more than 2σ confidence level. We use model-independent methods to study the issue of cosmic curvature. The method reconstructs the Hubble parameter H(z) from cosmic chronometers d…
The Diverse Morphology, Stellar Population, and Black Hole Scaling Relations of the Host Galaxies of Nearby Quasars
Ho, Luis C.; Zhao, Dongyao; Kim, Minjin +3 more
We present rest-frame B and I imaging of 35 low-redshift ( $z\lt 0.5$ ) Palomar-Green quasars using the Hubble Space Telescope Wide Field Camera 3. We perform multicomponent two-dimensional image decomposition to separate the host galaxy from its bright active nucleus, characterize its morphology, and measure its photometric properties. Special ca…
Radio spectral properties of star-forming galaxies in the MIGHTEE-COSMOS field and their impact on the far-infrared-radio correlation
Daddi, E.; Smail, Ian; Marchetti, L. +17 more
We study the radio spectral properties of 2094 star-forming galaxies (SFGs) by combining our early science data from the MeerKAT International GHz Tiered Extragalactic Exploration (MIGHTEE) survey with VLA, GMRT radio data, and rich ancillary data in the COSMOS field. These SFGs are selected at VLA 3 GHz, and their flux densities from MeerKAT 1.3 …
Three-dimensional magnetic reconnection in astrophysical plasmas
Li, Ting; Priest, Eric; Guo, Ruilong
Magnetic reconnection is a fundamental process in laboratory, magnetospheric, solar and astrophysical plasmas, whereby magnetic energy is converted into heat, bulk kinetic energy and fast particle energy. Its nature in two dimensions is much better understood than that in three dimensions, where its character is completely different and has many d…