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View article: Observationally derived change in the star formation rate as mergers progress
Observationally derived change in the star formation rate as mergers progress Open
Galaxy mergers can change the rate at which stars are formed. We can trace when these changes occur in simulations of galaxy mergers. However, for observed galaxies we do not know how the star formation rate (SFR) evolves along the merger …
View article: Classifying merger stages with adaptive deep learning and cosmological hydrodynamical simulations
Classifying merger stages with adaptive deep learning and cosmological hydrodynamical simulations Open
Aims. Hierarchical merging of galaxies plays an important role in galaxy formation and evolution. Mergers could trigger key evolutionary phases such as starburst activities and active accretion periods onto supermassive black holes at the …
View article: Euclid Quick Data Release (Q1). Active galactic nuclei identification using diffusion-based inpainting of Euclid VIS images
Euclid Quick Data Release (Q1). Active galactic nuclei identification using diffusion-based inpainting of Euclid VIS images Open
Light emission from galaxies exhibit diverse brightness profiles, influenced by factors such as galaxy type, structural features and interactions with other galaxies. Elliptical galaxies feature more uniform light distributions, while spir…
View article: Galaxy mergers classification using CNNs trained on Sérsic models, residuals and raw images
Galaxy mergers classification using CNNs trained on Sérsic models, residuals and raw images Open
Galaxy mergers are crucial for understanding galaxy evolution, and with large upcoming datasets, automated methods, such as Convolutional Neural Networks (CNNs), are needed for efficient detection. It is understood that these networks work…
View article: Classifying merger stages with adaptive deep learning and cosmological hydrodynamical simulations
Classifying merger stages with adaptive deep learning and cosmological hydrodynamical simulations Open
Hierarchical merging of galaxies plays an important role in galaxy formation and evolution. Mergers could trigger key evolutionary phases such as starburst activities and active accretion periods onto supermassive black holes at the centre…
View article: AGN -- host galaxy photometric decomposition using a fast, accurate and precise deep learning approach
AGN -- host galaxy photometric decomposition using a fast, accurate and precise deep learning approach Open
Identifying active galactic nuclei (AGN) is extremely important for understanding galaxy evolution and its connection with the assembly of supermassive black holes (SMBH). With the advent of deep and high angular resolution imaging surveys…
View article: Dust and power: Unravelling the merger-active galactic nucleus connection in the second half of cosmic history
Dust and power: Unravelling the merger-active galactic nucleus connection in the second half of cosmic history Open
Aims. Galaxy mergers represent a fundamental physical process under hierarchical structure formation, but their role in triggering active galactic nuclei (AGNs) is still unclear. We aim to investigate the merger-AGN connection using state-…
View article: Dust and Power: Unravelling the merger - active galactic nucleus connection in the second half of cosmic history
Dust and Power: Unravelling the merger - active galactic nucleus connection in the second half of cosmic history Open
Galaxy mergers represent a fundamental physical process under hierarchical structure formation, but their role in triggering AGNs is still unclear. We aim to investigate the merger-AGN connection using state-of-the-art observations and nov…
View article: Probabilistic and progressive deblended far-infrared and sub-millimetre point source catalogues
Probabilistic and progressive deblended far-infrared and sub-millimetre point source catalogues Open
Context. Single-dish far-infrared (far-IR) and sub-millimetre (sub-mm) point source catalogues and their connections with galaxy catalogues at other wavelengths are of paramount importance to studying galaxy evolution. However, due to the …
View article: Probabilistic and progressive deblended far-infrared and sub-millimetre point source catalogues I. Methodology and first application in the COSMOS field
Probabilistic and progressive deblended far-infrared and sub-millimetre point source catalogues I. Methodology and first application in the COSMOS field Open
Single-dish far-infrared (far-IR) and sub-millimetre (sub-mm) point source catalogues and their connections with catalogues at other wavelengths are of paramount importance. However, due to the large mismatch in spatial resolution, cross-m…
View article: Determining the time before or after a galaxy merger event
Determining the time before or after a galaxy merger event Open
Aims. This work aims to reproduce the time before or after a merger event of merging galaxies from the IllustrisTNG cosmological simulation using machine learning. Methods. Images of merging galaxies were created in the u , g , r , and i b…
View article: Galaxy merger challenge: A comparison study between machine learning-based detection methods
Galaxy merger challenge: A comparison study between machine learning-based detection methods Open
Aims . Various galaxy merger detection methods have been applied to diverse datasets. However, it is difficult to understand how they compare. Our aim is to benchmark the relative performance of merger detection methods based on machine le…
View article: A multi-band AGN-SFG classifier for extragalactic radio surveys using machine learning
A multi-band AGN-SFG classifier for extragalactic radio surveys using machine learning Open
Context. Extragalactic radio continuum surveys play an increasingly more important role in galaxy evolution and cosmology studies. While radio galaxies and radio quasars dominate at the bright end, star-forming galaxies (SFGs) and radio-qu…
View article: The half-mass radius of MaNGA galaxies: effect of IMF gradients
The half-mass radius of MaNGA galaxies: effect of IMF gradients Open
Gradients in the stellar populations (SP) of galaxies – e.g. in age, metallicity, stellar initial mass function (IMF) – can result in gradients in the stellar-mass-to-light ratio, M*/L. Such gradients imply that the distribution of the ste…
View article: Observations of the initial formation and evolution of spiral galaxies at 1 &lt; <i>z</i> &lt; 3 in the CANDELS fields
Observations of the initial formation and evolution of spiral galaxies at 1 < <i>z</i> < 3 in the CANDELS fields Open
Many aspects concerning the formation of spiral and disc galaxies remain unresolved, despite their discovery and detailed study over the past 150 yr. As such, we present the results of an observational search for proto-spiral galaxies and …
View article: SDSS-IV MaNGA: drivers of stellar metallicity in nearby galaxies
SDSS-IV MaNGA: drivers of stellar metallicity in nearby galaxies Open
The distribution of stellar metallicities within and across galaxies is an excellent relic of the chemical evolution across cosmic time. We present a detailed analysis of spatially resolved stellar populations based on >2.6 million spat…
View article: A deep learning approach to test the small-scale galaxy morphology and its relationship with star formation activity in hydrodynamical simulations
A deep learning approach to test the small-scale galaxy morphology and its relationship with star formation activity in hydrodynamical simulations Open
Hydrodynamical simulations of galaxy formation and evolution attempt to fully model the physics that shapes galaxies. The agreement between the morphology of simulated and real galaxies, and the way the morphological types are distributed …
View article: Detecting outliers in astronomical images with deep generative networks
Detecting outliers in astronomical images with deep generative networks Open
With the advent of future big-data surveys, automated tools for unsupervised discovery are becoming ever more necessary. In this work, we explore the ability of deep generative networks for detecting outliers in astronomical imaging data s…
View article: Galaxy properties as revealed by MaNGA – III. Kinematic profiles and stellar population gradients in S0s
Galaxy properties as revealed by MaNGA – III. Kinematic profiles and stellar population gradients in S0s Open
This is the third paper of a series where we study the stellar population gradients (SP; ages, metallicities, α-element abundance ratios, and stellar initial mass functions) of early-type galaxies (ETGs) at $z$ ≤ 0.08 from the Mapping Near…
View article: The stellar mass Fundamental Plane: the virial relation and a very thin plane for slow rotators
The stellar mass Fundamental Plane: the virial relation and a very thin plane for slow rotators Open
Early-type galaxies – slow and fast rotating ellipticals (E-SRs and E-FRs) and S0s/lenticulars – define a Fundamental Plane (FP) in the space of half-light radius Re, enclosed surface brightness Ie, and velocity dispersion σe. Since Ie and…
View article: X-shooter Spectroscopy and HST Imaging of 15 Massive Quiescent Galaxies at z ≳ 2
X-shooter Spectroscopy and HST Imaging of 15 Massive Quiescent Galaxies at z ≳ 2 Open
We present a detailed analysis of a large sample of spectroscopically confirmed massive quiescent galaxies (MQGs; log( M * / M ⊙ ) ∼ 11.5) at z ≳ 2. This sample comprises 15 galaxies selected in the COSMOS and UDS fields by their bright K …
View article: Evolution of the galaxy stellar mass functions and UV luminosity functions at z = 6−9 in the Hubble Frontier Fields
Evolution of the galaxy stellar mass functions and UV luminosity functions at z = 6−9 in the Hubble Frontier Fields Open
© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. We present new measurements of the evolution of the galaxy stellar mass functions (GSMFs) and ultraviolet luminosity functions (UV LFs) …
View article: A catalog of polychromatic bulge-disc decompositions of ∼17.600 galaxies in CANDELS
A catalog of polychromatic bulge-disc decompositions of ∼17.600 galaxies in CANDELS Open
Understanding how bulges grow in galaxies is critical step towards unveiling\nthe link between galaxy morphology and star-formation. To do so, it is\nnecessary to decompose large sample of galaxies at different epochs into their\nmain comp…
View article: Stellar populations, stellar masses and the formation of galaxy bulges and discs at z < 3 in CANDELS
Stellar populations, stellar masses and the formation of galaxy bulges and discs at z < 3 in CANDELS Open
We present a multi-component structural analysis of the internal structure of 1074 high redshift massive galaxies at 1 < z < 3 from the CANDELS HST Survey. In particular we examine galaxies best-fit by two structural components, and thus l…
View article: Galaxy And Mass Assembly (GAMA): $\mathcal {M_\star }\text{--}R_{\rm e}$ relations of<i>z</i>= 0 bulges, discs and spheroids
Galaxy And Mass Assembly (GAMA): $\mathcal {M_\star }\text{--}R_{\rm e}$ relations of<i>z</i>= 0 bulges, discs and spheroids Open
© 2016 The Authors. We perform automated bulge + disc decomposition on a sample of ~7500 galaxies from the Galaxy And Mass Assembly (GAMA) survey in the redshift range of 0.002 < z < 0.06 using Structural Investigation of Galaxies via Mode…
View article: The formation of bulges, discs and two-component galaxies in the CANDELS Survey at<i>z</i> < 3
The formation of bulges, discs and two-component galaxies in the CANDELS Survey at<i>z</i> < 3 Open
We examine a sample of 1495 galaxies in the CANDELS fields to determine the evolution of two-component galaxies, including bulges and discs, within massive galaxies at the epoch 1 < z < 3 when the Hubble sequence forms. We fit all of our g…