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Nov 26, 2024 | 
academic.oup.com | Pomona College |Space Research
Recent observations with the James Webb Space Telescope (JWST) have uncovered unexpectedly high cosmic star formation activity in the early Universe, mere hundreds of millions of years after the Big Bang. These observations are often understood to reflect an evolutionary shift in star formation efficiency (SFE) caused by changing galactic conditions during these early epochs.
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Oct 10, 2024 | 
academic.oup.com | Johns Hopkins |Space Research
As the search for exoplanets extends into its fourth decade, the population of giant planets at orbital scales comparable to those of the Solar system ( au) has come increasingly into focus. Though the most iconic extrasolar giant planets are the short-period hot Jupiters, long-term radial velocity (RV) surveys have shown that giant planets are most frequently found at much more distant separations since at least the work of Cumming et al. (2008).
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Oct 8, 2024 | 
academic.oup.com | Space Research
Supermassive black holes (SMBHs) are thought to be ubiquitous in the Universe, residing at the centre of almost every massive galaxy (e.g. Magorrian et al. 1998; Ferrarese & Merritt 2000; Kormendy & Ho 2013). The basic elements of our formation story for these enigmatic objects have hardly changed since their existence was hypothesized, triggered by the discovery of the first quasar (Schmidt 1963).
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Sep 9, 2024 | 
academic.oup.com | Universidad Diego Portales |Madingley Road |Space Research
‘Bare’ active galactic nuclei (AGN) are a subclass of Type 1 AGN that show little or no intrinsic absorption. They offer an unobscured view of the central regions of the AGN and therefore serve as ideal targets to study the relativistic reflection features originating from the innermost regions of the accretion disc.
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Jun 27, 2024 | 
academic.oup.com | Madingley Road |Space Research |Rigby J. R
The interstellar medium (ISM) of star-forming galaxies is both cradle and grave for the generations of stars embedded within. Throughout their lives, these stars batter the ISM with stellar winds, supernovae, and a flood of photons which leave it chemically enriched and injected with energy (Girichidis et al. 2020; Vogelsberger et al. 2020). While stellar populations shape the ISM, they are also shaped by it.
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Jun 13, 2024 | 
academic.oup.com | Space Research
Search for other works by this author on: Search for other works by this author on: Search for other works by this author on: Search for other works by this author on: Search for other works by this author on: Search for other works by this author on: Search for other works by this author on: Search for other works by this author on: Search for other works by this author on: Institute of Cosmology and Gravitation, University of Portsmouth Search for other works by this author on: Kavli...
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May 20, 2024 | 
academic.oup.com | Space Research
Self-interacting dark matter (SIDM) is increasingly studied as a potential solution to small-scale discrepancies between simulations of cold dark matter (CDM) and observations. We examine a physically motivated two-state SIDM model with both elastic and inelastic scatterings. In particular, endothermic, exothermic, and elastic scattering have equal transfer cross sections at high relative velocities (v ≳ 400 km s−1).
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Apr 13, 2024 | 
academic.oup.com | Space Research |Vrije Universiteit
The environment of galaxy clusters has a significant impact on galaxy evolution compared to galaxies in the field. Cluster galaxies tend to be quenched since their gas is stripped as they enter the dense cluster environment. This causes them to be older, redder, and more elliptical than their counterparts in the field (e.g. Dressler 1980; Cooper et al. 2006; Donnari et al. 2021, and references therein).
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Apr 5, 2024 | 
academic.oup.com | Space Research |NASA Einstein Fellow
Large-amplitude accretion outbursts in young stars are expected to play a central role in proto-stellar assembly. Outburst identification historically has taken place using optical techniques, but recent, systematic infrared searches are enabling their discovery in heavily dust-obscured regions of the Galactic plane. Here, we present the discovery of WTP 10aaauow, a large-amplitude mid-infrared (MIR) outburst identified in a systematic search of NEOWISE data using new image subtraction techniques.
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Apr 5, 2024 | 
academic.oup.com | Space Research
Star formation proceeds through the gravitational collapse of molecular cloud cores to form a central protostar, initially through direct spherical accretion, followed by disc accretion (Armitage 2019). The process of accretion transports both mass and angular momentum throughout the protoplanetary disc (Pringle 1981), and is an intrinsically unsteady process (Turner et al. 2014). Observationally, variability is omnipresent in young stellar objects (YSOs; see Fischer et al. 2023 for a review).
