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A low-frequency sub-arcsecond view of powerful radio galaxies in rich-cluster environments: 3C 34 and 3C 320
Hardcastle, M. J.; van Weeren, R. J.; Morabito, L. K. +2 more
Models of radio galaxy physics have been primarily based on high frequency (≥1 GHz) observations of their jets, hotspots, and lobes. Without highly resolved low-frequency observations, which provide information on older plasma, our understanding of the dynamics of radio galaxies and their interaction with their environment is limited. Here, we pre…
How the origin of stars in the Galaxy impacts the composition of planetary building blocks
Diakite, S.; Lagarde, N.; Guilbert-Lepoutre, A. +2 more
Context. Our Galaxy is composed of different stellar populations with varying chemical abundances, which are thought to imprint the composition of planet building blocks (PBBs). As such, the properties of stars should affect the properties of planets and small bodies formed in their systems. In this context, high-resolution spectroscopic surveys o…
Compact jets dominate the continuum emission in low-luminosity active galactic nuclei
Fernández-Ontiveros, J. A.; Prieto, A.; López-López, X.
Low-luminosity active galactic nuclei (LLAGN) are special among their kind due to the profound structural changes that the central engine experiences at low accretion rates (≲ 10−3 in Eddington units). The disappearance of the accretion disc - the blue bump - leaves behind a faint optical nuclear continuum whose nature has been largely …
AGN number fraction in galaxy groups and clusters at z < 1.4 from the Subaru Hyper Suprime-Cam survey
Goto, Tomotsugu; Imanishi, Masatoshi; Schramm, Malte +20 more
One of the key questions on active galactic nuclei (AGN) in galaxy clusters is how AGN could affect the formation and evolution of member galaxies and galaxy clusters in the history of the Universe. To address this issue, we investigate the dependence of AGN number fraction (fAGN) on cluster redshift (zcl) and distance from t…
Observations of neutral carbon in 29 high-z lensed dusty star-forming galaxies and the comparison of gas mass tracers
Weiss, A.; Greve, T. R.; Vieira, J. D. +10 more
Context. The nature and evolution of high-redshift dusty star-forming galaxies (high-z DSFGs) remain open questions. Their massive gas reservoirs play an important role in driving the intense star formation rates hosted in these galaxies.
Aims: Our aim is to estimate the molecular gas content of high-z DSFGs by using various gas mass tracers,…
The State of CO and CO2 Ices in the Kuiper Belt as Seen by JWST
Fraser, Wesley C.; Brown, Michael E.
JWST has shown that CO2 and CO are common on the surfaces of objects in the Kuiper Belt and have apparent surface coverages even higher than that of water ice, though water ice is expected to be significantly more abundant in the bulk composition. Using full Mie scattering theory, we show that the high abundance and the unusual spectral…
Reconstructing the XUV Spectra of Active Sun-like Stars Using Solar Scaling Relations with Magnetic Flux
Notsu, Yuta; Namekata, Kosuke; Toriumi, Shin +3 more
The Kepler space telescope and Transiting Exoplanet Survey Satellite unveiled that Sun-like stars frequently host exoplanets. These exoplanets are subject to fluxes of ionizing radiation in the form of X-ray and extreme-ultraviolet (EUV) radiation that may cause changes in their atmospheric dynamics and chemistry. While X-ray fluxes can be observe…
A Highly Magnified Gravitationally Lensed Red QSO at z = 2.5 with a Significant Flux Ratio Anomaly
Djorgovski, S. G.; Stern, Daniel; Lacy, Mark +12 more
We present the discovery of a gravitationally lensed dust-reddened QSO at z = 2.517, identified in a survey for QSOs by infrared selection. Hubble Space Telescope imaging reveals a quadruply lensed system in a cusp configuration, with a maximum image separation of ~1.″8. We find that, compared to the central image of the cusp, the neighboring brig…
Hubble WFC3 Spectroscopy of the Terrestrial Planets L 98-59 c and d: No Evidence for a Clear Hydrogen Dominated Primary Atmosphere
Zhu, Yi-Nan; Zhou, Li; Ma, Bo +1 more
The nearby bright M-dwarf star L 98-59 has three terrestrial-sized planets. One challenge remaining in characterizing atmospheres around such planets is that it is not known a priori whether they possess any atmospheres. Here we report on study of the atmospheres of L 98-59 c and L 98-59 d using near-infrared spectral data from the G141 grism of H…
Detection of He++ ion in the star-forming ring of the Cartwheel using MUSE data and ionizing mechanisms
Charlot, S.; Bruzual, G.; Plat, A. +3 more
We here report the detection of the nebular He II λ4686 line in 32 H II regions in the metal-poor collisional ring galaxy Cartwheel using the Multi-Unit Spectroscopic Explorer (MUSE) data set. The measured I(He II λ4686)/I(H β) ratio varies from 0.004 to 0.07, with a mean value of 0.010 ± 0.003. Ten of these 32 H II regions are coincident with the…