Search Publications
Shock Induced Strong Substorms and Super Substorms: Preconditions and Associated Oxygen Ion Dynamics
Zong, Q. -G.; Fu, S. -Y.; Yue, C.
It is well known that the interaction between interplanetary (IP) shocks and the Earth's magnetosphere would generate/excite various types of geomagnetic phenomena. Progresses have been made on the Earth's magnetospheric response to solar wind forcing in recent years in the aspects associated with magnetospheric substorms. Strong substorms and sup…
Connecting X-ray nuclear winds with galaxy-scale ionised outflows in two z ∼ 1.5 lensed quasars
Marconi, A.; Vignali, C.; Comastri, A. +15 more
Aims: Outflows driven by active galactic nuclei (AGN) are expected to have a significant impact on host galaxy evolution, but the matter of how they are accelerated and propagated on galaxy-wide scales is still under debate. This work addresses these questions by studying the link between X-ray, nuclear ultra-fast outflows (UFOs), and extende…
Tracing the evolution of dust-obscured activity using sub-millimetre galaxy populations from STUDIES and AS2UDS
Scott, D.; Shirley, R.; Smail, Ian +16 more
We analyse the physical properties of 121 SNR ≥ 5 sub-millimetre galaxies (SMGs) from the STUDIES 450 µm survey. We model their UV-to-radio spectral energy distributions using MAGPHYS+photo-z and compare the results to similar modelling of 850 µm-selected SMG sample from AS2UDS, to understand the fundamental physical differences betwee…
Overdensities of submillimetre-bright sources around candidate protocluster cores selected from the South Pole Telescope survey
Greve, Thomas R.; Phadke, Kedar A.; Aravena, Manuel +21 more
We present APEX-LABOCA 870-µm observations of the fields surrounding the nine brightest high-redshift unlensed objects discovered in the South Pole Telescope's (SPT) 2500 deg2 survey. Initially seen as point sources by SPT's 1-arcmin beam, the 19-arcsec resolution of our new data enables us to deblend these objects and search for …
Abundances of neutron-capture elements in thin- and thick-disc stars in the solar neighbourhood
Tautvaišienė, G.; Drazdauskas, A.; Mikolaitis, Š. +4 more
Aims: The aim of this work is to determine abundances of neutron-capture elements for thin- and thick-disc F, G, and K stars in several selected sky fields near the north ecliptic pole and to compare the results with the Galactic chemical evolution models, to explore elemental gradients according to stellar ages, mean galactocentric distances…
The Astrophysical Distance Scale. III. Distance to the Local Group Galaxy WLM Using Multiwavelength Observations of the Tip of the Red Giant Branch, Cepheids, and JAGB Stars
Madore, Barry F.; Freedman, Wendy L.; Lee, Abigail J. +3 more
The local determination of the Hubble constant sits at a crossroad. Current estimates of the local expansion rate of the universe differ by about 1.7σ, derived from the Cepheid- and TRGB-based calibrations, applied to Type Ia supernovae. To help elucidate possible sources of systematic error causing the tension, we show in this study the recently …
RELICS: Properties of z ≥ 5.5 Galaxies Inferred from Spitzer and Hubble Imaging, Including A Candidate z ∼ 6.8 Strong [O III] emitter
Ouchi, Masami; Mahler, Guillaume; Frye, Brenda L. +26 more
We present constraints on the physical properties (including stellar mass, age, and star formation rate) of 207 6 ≲ z ≲ 8 galaxy candidates from the Reionization Lensing Cluster Survey (RELICS) and Spitzer-RELICS surveys. We measure photometry using T-PHOT and perform spectral energy distribution fitting using EAzY and BAGPIPES. Of the 207 candida…
Anoxic chemical weathering under a reducing greenhouse on early Mars
Liu, J.; Xiao, L.; Michalski, J. R. +3 more
Reduced greenhouse gases such as methane (CH4) and hydrogen (H2) might be the only tenable solution to explain warming of the ancient Martian climate, but direct geological evidence that a reduced atmosphere actually existed on Mars has been lacking. Here we report widespread, strong Fe loss in chemically weathered bedrock se…
The Detection of a Hot Molecular Core in the Extreme Outer Galaxy
Shimonishi, Takashi; Furuya, Kenji; Izumi, Natsuko +1 more
Interstellar chemistry in low-metallicity environments is crucial to understand chemical processes in the past metal-poor universe. Recent studies of interstellar molecules in nearby low-metallicity galaxies have suggested that metallicity has a significant effect on the chemistry of star-forming cores. Here we report the first detection of a hot …
Telltale signs of metal recycling in the circumgalactic medium of a z 0.77 galaxy
Rigby, J. R.; Sharon, K.; Tejos, N. +15 more
We present gravitational-arc tomography of the cool-warm enriched circumgalactic medium (CGM) of an isolated galaxy ('G1') at z ≈ 0.77. Combining VLT/MUSE adaptive-optics and Magellan/MagE echelle spectroscopy, we obtain partially resolved kinematics of Mg II in absorption and [O II] in emission. The unique arc configuration allows us to probe 42 …