Research

Deep Extragalactic VIsible Legacy Survey (DEVILS): The emergence of bulges and decline of disk growth since z=1

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The majority of the stellar mass in the Universe today resides in galaxies with two primary structural components (bulge and disk). In this work, we use the largest contiguous HST imaging region (COSMOS), the Deep Extragalactic VIsible Legacy Survey (DEVILS), and the galaxy structural fitting code {\sc ProFit}, to deconstruct ∼35,000 galaxies into their sub-structures. We use …

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How Well Can We Measure Galaxy Dust Attenuation Curves? The Impact of the Assumed Star-Dust Geometry Model in SED Fitting

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One of the most common methods for inferring galaxy attenuation curves is via spectral energy distribution (SED) modeling, where the dust attenuation properties are modeled simultaneously with other galaxy physical properties. In this paper, we assess the ability of SED modeling to infer these dust attenuation curves from broadband photometry, and suggest a new flexible …

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The LOFAR Two-metre Sky Survey — V. Second data release

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In this data release from the LOFAR Two-metre Sky Survey (LoTSS) we present 120-168MHz images covering 27% of the northern sky. Our coverage is split into two regions centred at approximately 12h45m +44∘30′ and 1h00m +28∘00′ and spanning 4178 and 1457 square degrees respectively. The images were derived from 3,451hrs (7.6PB) of LOFAR High Band …

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Understanding the Sunyaev-Zeldovich decrement versus halo mass using the SIMBA and TNG Simulations

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The relation between the integrated Sunyaev-Zeldovich (SZ) y-decrement versus halo mass (Y-M) can potentially constrain galaxy formation models, if theoretical and observational systematics can be properly assessed. We investigate the Y−M relation in the SIMBA and IllustrisTNG-100 cosmological hydrodynamic simulations, quantifying the effects of feedback, line-of-sight projection, and beam convolution. We find that SIMBA’s AGN jet feedback generates …

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New constraints on primordial features from the galaxy two-point correlation function

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Features in the primordial power spectrum represent the imprinted signal in the density perturbations of the physics and evolution of the early Universe. A measurement of such signals will represents the need to go beyond the minimal assumption made for the initial conditions of the cosmological perturbations. For the first time, we study different templates …

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The 1.28 GHz MeerKAT Galactic Center Mosaic

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The inner ∼200 pc region of the Galaxy contains a 4 million M⊙ supermassive black hole (SMBH), significant quantities of molecular gas, and star formation and cosmic ray energy densities that are roughly two orders of magnitude higher than the corresponding levels in the Galactic disk. At a distance of only 8.2 kpc, the region presents astronomers …

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Galaxy and Mass Assembly (GAMA): Mid-infrared properties as tracers of galaxy environment

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We investigate how different mid-infrared (mid-IR) properties of galaxies trace the environment in which the galaxies are located. For this purpose, we first study the dependence of galaxy clustering on the absolute magnitude at 3.4 μm and redshift. Then, we look into the correlation between various mid-IR properties and the environment. We also explore how various …

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A Hitchhiker’s Guide to Anomaly Detection with Astronomaly

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The next generation of telescopes such as the SKA and the Rubin Observatory will produce enormous data sets, requiring automated anomaly detection to enable scientific discovery. Here, we present an overview and friendly user guide to the Astronomaly framework for active anomaly detection in astronomical data. Astronomaly uses active learning to combine the raw processing …

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