T. Bitsakis
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View article: X-ray emission from the taffy (VV254) galaxies and bridge
X-ray emission from the taffy (VV254) galaxies and bridge Open
We present the first X-ray observations of the Taffy galaxies (UGC 12914/5) with the Chandra observatory and detect soft X-ray emission in the region of the gas-rich, radio-continuum-emitting Taffy bridge. The results are compared to Hersc…
View article: Game based assessments of cognitive ability in recruitment: Validity, fairness and test-taking experience
Game based assessments of cognitive ability in recruitment: Validity, fairness and test-taking experience Open
Gamification and machine learning are emergent technologies in recruitment, promising to improve the user experience and fairness of assessments. We test this by validating a game based assessment of cognitive ability with a machine learni…
View article: Scoring a forced-choice image-based assessment of personality: A comparison of machine learning, regression, and summative approaches
Scoring a forced-choice image-based assessment of personality: A comparison of machine learning, regression, and summative approaches Open
Recent years have seen rapid advancements in the way that personality is measured, resulting in a number of innovative predictive measures being proposed, including using features extracted from videos and social media profiles. In the con…
View article: Measuring Personality through Images: Validating a Forced-Choice Image-Based Assessment of the Big Five Personality Traits
Measuring Personality through Images: Validating a Forced-Choice Image-Based Assessment of the Big Five Personality Traits Open
Selection methods are commonly used in talent acquisition to predict future job performance and to find the best candidates, but questionnaire-based assessments can be lengthy and lead to candidate fatigue and poor engagement, affecting co…
View article: Census and classification of low-surface-brightness structures in nearby early-type galaxies from the MATLAS survey
Census and classification of low-surface-brightness structures in nearby early-type galaxies from the MATLAS survey Open
The morphology of galaxies gives essential constraints on the models of galaxy evolution. The morphology of the features in the low-surface-brightness (LSB) regions of galaxies has not been fully explored yet because of observational diffi…
View article: Parameter estimation for scarce stellar populations
Parameter estimation for scarce stellar populations Open
We present a Bayesian method to determine simultaneously the age,\nmetallicity, distance modulus, and interstellar reddening by dust of any\nresolved stellar population, by comparing the observed and synthetic color\nmagnitude diagrams on …
View article: The integrated properties of the CALIFA galaxies: model-derived galaxy parameters and quenching of star formation
The integrated properties of the CALIFA galaxies: model-derived galaxy parameters and quenching of star formation Open
We present a study of the integrated properties of the 835 galaxies in the\nCALIFA survey. To derive the main physical parameters of the galaxies we have\nfitted their UV-to-IR spectral energy distributions (SED) with sets of\ntheoretical …
View article: Shocked POststarburst Galaxy Survey. III. The Ultraviolet Properties of SPOGs
Shocked POststarburst Galaxy Survey. III. The Ultraviolet Properties of SPOGs Open
The Shocked POststarburst Galaxy Survey (SPOGS) aims to identify galaxies in the transitional phase between actively star-forming and quiescence with nebular lines that are excited from shocks rather than star formation processes. We explo…
View article: Modelling dust rings in early-type galaxies through a sequence of radiative transfer simulations and 2D image fitting
Modelling dust rings in early-type galaxies through a sequence of radiative transfer simulations and 2D image fitting Open
A large fraction of early-type galaxies (ETGs) host prominent dust features,\nand central dust rings are arguably the most interesting among them. We present\nhere `Lord Of The Rings' (LOTR), a new methodology which allows to integrate\nth…
View article: Herschel Spectroscopy of the Taffy Galaxies (UGC 12914/12915 = VV 254): Enhanced [C ii] Emission in the Collisionally Formed Bridge
Herschel Spectroscopy of the Taffy Galaxies (UGC 12914/12915 = VV 254): Enhanced [C ii] Emission in the Collisionally Formed Bridge Open
Using the PACS and SPIRE spectrometers on board Herschel , we obtained observations of the Taffy galaxies (UGC 12914/12915) and bridge. The Taffy system is believed to be the result of a face-on collision between two gas-rich galaxies, in …
View article: Stellar Population Synthesis of Star-forming Clumps in Galaxy Pairs and Non-interacting Spiral Galaxies
Stellar Population Synthesis of Star-forming Clumps in Galaxy Pairs and Non-interacting Spiral Galaxies Open
We have identified 1027 star-forming complexes in a sample of 46 galaxies from the Spirals, Bridges, and Tails (SB&T) sample of interacting galaxies, and 693 star-forming complexes in a sample of 38 non-interacting spiral (NIS) galaxies in…
View article: The Distribution and Ages of Star Clusters in the Small Magellanic Cloud: Constraints on the Interaction History of the Magellanic Clouds
The Distribution and Ages of Star Clusters in the Small Magellanic Cloud: Constraints on the Interaction History of the Magellanic Clouds Open
We present a new study of the spatial distribution and ages of the star clusters in the Small Magellanic Cloud (SMC). To detect and estimate the ages of the star clusters we rely on the new fully automated method developed by Bitsakis et a…
View article: Early spectra of the gravitational wave source GW170817: Evolution of a neutron star merger
Early spectra of the gravitational wave source GW170817: Evolution of a neutron star merger Open
Photons from a gravitational wave event Two neutron stars merging together generate a gravitational wave signal and have also been predicted to emit electromagnetic radiation. When the gravitational wave event GW170817 was detected, astron…
View article: Light curves of the neutron star merger GW170817/SSS17a: Implications for r-process nucleosynthesis
Light curves of the neutron star merger GW170817/SSS17a: Implications for r-process nucleosynthesis Open
Photons from a gravitational wave event Two neutron stars merging together generate a gravitational wave signal and have also been predicted to emit electromagnetic radiation. When the gravitational wave event GW170817 was detected, astron…
View article: Connecting traces of galaxy evolution: the missing core mass–morphological fine structure relation
Connecting traces of galaxy evolution: the missing core mass–morphological fine structure relation Open
Deep exposure imaging of early-type galaxies (ETGs) are revealing the second-order complexity of these objects, which have been long considered uniform, dispersion-supported spheroidals. ‘Fine structure’ features (e.g. ripples, plumes, tid…
View article: SSDSS IV MaNGA - Properties of AGN host galaxies
SSDSS IV MaNGA - Properties of AGN host galaxies Open
We present here the characterization of the main properties of a sample of 98 AGN host galaxies, both type-II and type-I, in comparison with those of about 2700 non-active galaxies observed by the MaNGA survey. We found that AGN hosts are …
View article: A Novel Method to Automatically Detect and Measure the Ages of Star Clusters in Nearby Galaxies: Application to the Large Magellanic Cloud
A Novel Method to Automatically Detect and Measure the Ages of Star Clusters in Nearby Galaxies: Application to the Large Magellanic Cloud Open
We present our new, fully automated method to detect and measure the ages of star clusters in nearby galaxies, where individual stars can be resolved. The method relies purely on statistical analysis of observations and Monte-Carlo simulat…
View article: Star formation driven galactic winds in UGC 10043
Star formation driven galactic winds in UGC 10043 Open
We study the galactic wind in the edge-on spiral galaxy UGC 10043 with the combination of the CALIFA integral field spectroscopy data, scanning Fabry-Perot interferometry (FPI), and multiband photometry. We detect ionized gas in the extrap…
View article: Star formation driven galactic winds in UGC 10043
Star formation driven galactic winds in UGC 10043 Open
We study the galactic wind in the edge-on spiral galaxy UGC 10043 with the\ncombination of the CALIFA integral field spectroscopy data, scanning\nFabry-Perot interferometry (FPI), and multiband photometry. We detect ionized\ngas in the ext…
View article: Studying the evolution of galaxies in compact groups over the past 3 Gyr – II. The importance of environment in the suppression of star formation
Studying the evolution of galaxies in compact groups over the past 3 Gyr – II. The importance of environment in the suppression of star formation Open
We present an in depth study on the evolution of galaxy properties in compact groups over the past 3 Gyr. We are using the largest multiwavelength sample to-date, comprised 1770 groups (containing 7417 galaxies), in the redshift range of 0…
View article: The incidence of nuclear activity in galaxy pairs with different morphologies (E+E), (E+S) and (S+S)
The incidence of nuclear activity in galaxy pairs with different morphologies (E+E), (E+S) and (S+S) Open
We analysed 385 Sloan Digital Sky Survey Data Release 7 (SDSS-DR7) galactic spectra that belong to the catalogue of isolated pairs of galaxies by Karachentsev. The spectra correspond to physical pairs of galaxies defined by a difference in…
View article: Pipe3D, a pipeline to analyse integral field spectroscopy data: II. Analysis sequence and CALIFA dataproducts
Pipe3D, a pipeline to analyse integral field spectroscopy data: II. Analysis sequence and CALIFA dataproducts Open
We present Pipe3D, an analysis pipeline based on the FIT3D fitting tool, devel- oped to explore the properties of the stellar populations and ionized gas of Integral Field Spectroscopy data. Pipe3D was created to provide with coherent, sim…
View article: Studying the evolution of galaxies in compact groups over the past 3 Gyr – I. Nuclear activity
Studying the evolution of galaxies in compact groups over the past 3 Gyr – I. Nuclear activity Open
We present the first of a series of studies of the evolution of galaxies in compact groups over the past 3 Gyr. This article focuses on the evolution of nuclear activity and how it has been affected by the dense environment of the groups. …