S. C. Trager
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View article: The WEAVE-TwiLight-Survey: expanding WEAVE’s reach to bright and low-surface-density targets with a novel observing mode
The WEAVE-TwiLight-Survey: expanding WEAVE’s reach to bright and low-surface-density targets with a novel observing mode Open
Current-day multi-object spectroscopic surveys are often limited in their ability to observe bright stars due to their low surface densities, resulting in increased observational overheads and reduced efficiency. Addressing this, we have d…
View article: WEAVE First Light Observations: Origin and Dynamics of the Shock Front in Stephan’s Quintet
WEAVE First Light Observations: Origin and Dynamics of the Shock Front in Stephan’s Quintet Open
We present a detailed study of the large-scale shock front in Stephan’s Quintet, a by-product of past and ongoing interactions. Using integral-field spectroscopy from the new William Herschel Telescope Enhanced Area Velocity Explorer (WEAV…
View article: Supervised star, galaxy, and QSO classification with sharpened dimensionality reduction
Supervised star, galaxy, and QSO classification with sharpened dimensionality reduction Open
Aims. We explored the use of broadband colors to classify stars, galaxies, and quasi-stellar objects (QSOs). Specifically, we applied sharpened dimensionality reduction (SDR)-aided classification to this problem, with the aim of enhancing …
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: Retrieval of the physical parameters of galaxies from WEAVE-StePS-like data using machine learning
Retrieval of the physical parameters of galaxies from WEAVE-StePS-like data using machine learning Open
Context. The William Herschel Telescope Enhanced Area Velocity Explorer (WEAVE) is a new, massively multiplexing spectrograph that allows us to collect about one thousand spectra over a 3 square degree field in one observation. The WEAVE S…
View article: Retrieval of the physical parameters of galaxies from WEAVE-StePS-like data using machine learning
Retrieval of the physical parameters of galaxies from WEAVE-StePS-like data using machine learning Open
The WHT Enhanced Area Velocity Explorer (WEAVE) is a new, massively multiplexing spectrograph. This new instrument will be exploited to obtain high S/N spectra of $\sim$25000 galaxies at intermediate redshifts for the WEAVE Stellar Populat…
View article: A Fast Alpha-Tree Algorithm for Extreme Dynamic Range Pixel Dissimilarities
A Fast Alpha-Tree Algorithm for Extreme Dynamic Range Pixel Dissimilarities Open
The α-tree algorithm is a useful hierarchical representation technique which facilitates comprehension of images such as remote sensing and medical images. Most α-tree algorithms make use of priority queues to process image edges in a corr…
View article: Diagnosing the interstellar medium of galaxies with far-infrared emission lines
Diagnosing the interstellar medium of galaxies with far-infrared emission lines Open
Context. Gas cooling processes in the interstellar medium (ISM) are key to understanding how star formation occurs in galaxies. Far-infrared (FIR) fine-structure emission lines can be used to infer gas conditions and trace different phases…
View article: Stellar metallicity from optical and UV spectral indices: Test case for WEAVE-StePS
Stellar metallicity from optical and UV spectral indices: Test case for WEAVE-StePS Open
The upcoming generation of optical spectrographs on four meter-class telescopes, with their huge multiplexing capabilities, excellent spectral resolution, and unprecedented wavelength coverage, will provide high-quality spectra for thousan…
View article: Stellar metallicity from optical and UV spectral indices: Test case for WEAVE-StePS
Stellar metallicity from optical and UV spectral indices: Test case for WEAVE-StePS Open
Context. The upcoming generation of optical spectrographs on four meter-class telescopes, with their huge multiplexing capabilities, excellent spectral resolution, and unprecedented wavelength coverage, will provide high-quality spectra fo…
View article: The MeerKAT Fornax Survey I. Survey description and first evidence of ram pressure in the Fornax galaxy cluster
The MeerKAT Fornax Survey I. Survey description and first evidence of ram pressure in the Fornax galaxy cluster Open
The MeerKAT Fornax Survey maps the distribution and kinematics of atomic neutral hydrogen gas (H I) in the nearby Fornax galaxy cluster using the MeerKAT telescope. The 12 deg2 survey footprint covers the central region of the cluster out …
View article: NGC 1436: the making of a lenticular galaxy in the Fornax Cluster
NGC 1436: the making of a lenticular galaxy in the Fornax Cluster Open
We study the evolutionary path of the Fornax Cluster galaxy NGC 1436, which is known to be currently transitioning from a spiral into a lenticular morphology. This galaxy hosts an inner star-forming disc and an outer quiescent disc, and we…
View article: NGC 1436: the making of a lenticular galaxy in the Fornax cluster
NGC 1436: the making of a lenticular galaxy in the Fornax cluster Open
We study the evolutionary path of the Fornax cluster galaxy NGC$~$1436, which is known to be currently transitioning from a spiral into a lenticular morphology. This galaxy hosts an inner star-forming disc and an outer quiescent disc, and …
View article: The MeerKAT Fornax Survey
The MeerKAT Fornax Survey Open
The MeerKAT Fornax Survey maps the distribution and kinematics of atomic neutral hydrogen gas (H I ) in the nearby Fornax galaxy cluster using the MeerKAT telescope. The 12 deg 2 survey footprint covers the central region of the cluster ou…
View article: The wide-field, multiplexed, spectroscopic facility WEAVE: Survey design, overview, and simulated implementation
The wide-field, multiplexed, spectroscopic facility WEAVE: Survey design, overview, and simulated implementation Open
WEAVE, the new wide-field, massively multiplexed spectroscopic survey facility for the William Herschel Telescope, saw first light in late 2022. WEAVE comprises a new 2-deg field-of-view prime-focus corrector system, a nearly 1000-multiple…
View article: The MeerKAT Fornax Survey -- I. Survey description and first evidence of ram pressure in the Fornax galaxy cluster
The MeerKAT Fornax Survey -- I. Survey description and first evidence of ram pressure in the Fornax galaxy cluster Open
The MeerKAT Fornax Survey maps the distribution and kinematics of atomic neutral hydrogen gas (HI) in the nearby Fornax galaxy cluster using the MeerKAT telescope. The 12 deg^2 survey footprint covers the central region of the cluster out …
View article: WEAVE-StePS: A stellar population survey using WEAVE at WHT
WEAVE-StePS: A stellar population survey using WEAVE at WHT Open
Context. The upcoming new generation of optical spectrographs on four-meter-class telescopes will provide valuable opportunities for forthcoming galaxy surveys through their huge multiplexing capabilities, excellent spectral resolution, an…
View article: WEAVE-StePS. A stellar population survey using WEAVE at WHT
WEAVE-StePS. A stellar population survey using WEAVE at WHT Open
The upcoming new generation of optical spectrographs on four-meter-class telescopes will provide valuable opportunities for forthcoming galaxy surveys through their huge multiplexing capabilities, excellent spectral resolution, and unprece…
View article: Fountain-driven gas accretion feeding star formation over the disc of NGC 2403
Fountain-driven gas accretion feeding star formation over the disc of NGC 2403 Open
We use a dynamical model of galactic fountain to study the neutral extraplanar gas (EPG) in the nearby spiral galaxy NGC 2403. We have modelled the EPG as a combination of material ejected from the disc by stellar feedback (i.e. galactic f…
View article: Fountain-driven gas accretion feeding star formation over the disc of NGC 2403
Fountain-driven gas accretion feeding star formation over the disc of NGC 2403 Open
We use a dynamical model of galactic fountain to study the neutral extraplanar gas (EPG) in the nearby spiral galaxy NGC 2403. We have modelled the EPG as a combination of material ejected from the disc by stellar feedback (i.e. galactic f…
View article: The wide-field, multiplexed, spectroscopic facility WEAVE: Survey design, overview, and simulated implementation
The wide-field, multiplexed, spectroscopic facility WEAVE: Survey design, overview, and simulated implementation Open
WEAVE, the new wide-field, massively multiplexed spectroscopic survey facility for the William Herschel Telescope, will see first light in late 2022. WEAVE comprises a new 2-degree field-of-view prime-focus corrector system, a nearly 1000-…
View article: Forecasting the success of the WEAVE Wide-Field Cluster Survey on the extraction of the cosmic web filaments around galaxy clusters
Forecasting the success of the WEAVE Wide-Field Cluster Survey on the extraction of the cosmic web filaments around galaxy clusters Open
Next-generation wide-field spectroscopic surveys will observe the infall regions around large numbers of galaxy clusters with high sampling rates for the first time. Here we assess the feasibility of extracting the large-scale cosmic web a…
View article: Forecasting the success of the WEAVE Wide-Field Cluster Survey on the extraction of the cosmic web filaments around galaxy clusters
Forecasting the success of the WEAVE Wide-Field Cluster Survey on the extraction of the cosmic web filaments around galaxy clusters Open
Next-generation wide-field spectroscopic surveys will observe the infall regions around large numbers of galaxy clusters with high sampling rates for the first time. Here, we assess the feasibility of extracting the large-scale cosmic web …
View article: Calibration at elevation of the WEAVE fibre positioner
Calibration at elevation of the WEAVE fibre positioner Open
WEAVE is the new wide-field spectroscopic facility for the prime focus of the\nWilliam Herschel Telescope in La Palma, Spain. Its fibre positioner is\nessential for the accurate placement of the spectrograph's ~960-fibre\nmultiplex. To max…
View article: Diagnosing the interstellar medium of galaxies with far-infrared emission lines II. [C II], [O I], [O III], [N II] and [N III] up to z=6
Diagnosing the interstellar medium of galaxies with far-infrared emission lines II. [C II], [O I], [O III], [N II] and [N III] up to z=6 Open
Gas cooling processes in the interstellar medium (ISM) are key to understanding how star-formation processes occur in galaxies. Far-infrared (FIR) fine-structure emission lines can be used as a tool to understand the gas conditions and tra…
View article: Fundamental parameters for 222 B-type stars for the X-shooter Spectral Library
Fundamental parameters for 222 B-type stars for the X-shooter Spectral Library Open
We use the MIDE3700 code to find effective temperatures ( T eff ) and surface gravities (log g ) via the Barbier Chalonge Divan (BCD) method for 222 B-type stars in the ESO archive in preparation for their inclusion as an extension to the …
View article: Visual cluster separation using high-dimensional sharpened dimensionality reduction
Visual cluster separation using high-dimensional sharpened dimensionality reduction Open
Applying dimensionality reduction (DR) to large, high-dimensional data sets can be challenging when distinguishing the underlying high-dimensional data clusters in a 2D projection for exploratory analysis. We address this problem by first …
View article: The X-shooter Spectral Library (XSL): Data Release 3
The X-shooter Spectral Library (XSL): Data Release 3 Open
We present the third data release (DR3) of the X-shooter Spectral Library (XSL). This moderate-to-high resolution, near-ultraviolet-to-near-infrared (350-2480 nm, R similar to 10 000) spectral library is composed of 830 stellar spectra of …