Meiert W. Grootes
A5017646167- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- Species Distribution and Climate Change
- Remote Sensing in Agriculture
- Remote Sensing and LiDAR Applications
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Avian ecology and behavior
- Computational Physics and Python Applications
- Wildlife Ecology and Conservation
- Cryospheric studies and observations
- Peatlands and Wetlands Ecology
- Land Use and Ecosystem Services
- Hydrology and Watershed Management Studies
- Meteorological Phenomena and Simulations
- Radio Astronomy Observations and Technology
- Forest Ecology and Biodiversity Studies
- Calibration and Measurement Techniques
- Advanced Fluorescence Microscopy Techniques
- Adaptive optics and wavefront sensing
- Data Management and Algorithms
- Scientific Computing and Data Management
Netherlands eScience Center
2019-2024
Max Planck Institute for Nuclear Physics
2011-2020
European Space Research and Technology Centre
2016-2018
Max Planck Society
2011-2015
Max Planck Innovation
2011
Institut d'Astrophysique de Paris
2011
European Southern Observatory
2011
Vrije Universiteit Brussel
2011
The Galaxy And Mass Assembly (GAMA) survey has been operating since February 2008 on the 3.9-m Anglo-Australian Telescope using AAOmega fibre-fed spectrograph facility to acquire spectra with a resolution of R~1300 for 120,862 SDSS selected galaxies. target catalogue constitutes three contiguous equatorial regions centred at 9h (G09), 12h (G12) and 14.5h (G15) each 12 x 4 sq.deg limiting fluxes r < 19.4, 19.8, 19.4 mag respectively (and additional limits other wavelengths). Spectra reliable...
The Galaxy And Mass Assembly (GAMA) survey is one of the largest contemporary spectroscopic surveys low redshift galaxies. Covering an area ∼286 deg2 (split among five regions) down to a limiting magnitude r < 19.8 mag, we have collected spectra and reliable redshifts for 238 000 objects using AAOmega spectrograph on Anglo-Australian Telescope. In addition, assembled imaging data from number independent in order generate photometry spanning wavelength range 1 nm–1 m. Here, report recently...
We describe data release 3 (DR3) of the Galaxy And Mass Assembly (GAMA) survey. The GAMA survey is a spectroscopic redshift and multi-wavelength photometric in three equatorial regions each 60.0 deg^2 (G09, G12, G15), two southern 55.7 (G02) 50.6 (G23). DR3 consists of: first covering G02 region on H-ATLAS sources regions; updates to released DR2. includes 154809 with secure redshifts across four regions. A subset 95.5% complete r<19.8 over an area 19.5 deg^2, 20086 galaxy redshifts, that...
In Galaxy And Mass Assembly Data Release 4 (GAMA DR4), we make available our full spectroscopic redshift sample. This includes 248682 galaxy spectra, and, in combination with earlier surveys, results 330542 redshifts across five sky regions covering ~250deg^2. The density, is the highest over such a sustained area, has exceptionally high completeness (95 per cent to r_KIDS=19.65mag), and well suited for study of mergers, groups, low (z<0.25) population. DR4 32 value-added tables or...
The Galaxy And Mass Assembly (GAMA) survey is a multiwavelength photometric and spectroscopic survey, using the AAOmega spectrograph on Anglo-Australian Telescope to obtain spectra for up ∼300 000 galaxies over 280 deg2, limiting magnitude of rpet < 19.8 mag. target are distributed 0 z ≲ 0.5 with median redshift ≈ 0.2, although distribution includes small number systems, primarily quasars, at higher redshifts, beyond = 1. accuracy ranges from σv 50 km s−1 100 depending signal-to-noise ratio...
We present the Galaxy And Mass Assembly (GAMA) Panchromatic Data Release (PDR) constituting over 230 deg2 of imaging with photometry in 21 bands extending from far-UV to far-IR. These data complement our spectroscopic campaign 300k galaxies, and are compiled observations a variety facilities including: GALaxy Evolution eXplorer, Sloan Digital Sky Survey, Visible Infrared Telescope for Astronomy (VISTA), Wide-field Survey Explorer, Herschel, GAMA regions currently being surveyed by VLT (VST)...
We present the Lambda Adaptive Multi-Band Deblending Algorithm in R (LAMBDAR), a novel code for calculating matched aperture photometry across images that are neither pixel- nor PSF-matched, using prior definitions derived from high resolution optical imaging. The development of this program is motivated by desire consistent and uncertainties large ranges photometric imaging, use spectral energy distributions. describe program, specifically key features required robust determination...
We present a meta-analysis of star-formation rate (SFR) indicators in the GAMA survey, producing 12 different SFR metrics and determining SFR-M* relation for each. compare contrast published methods to extract from each indicator, using well-defined local sample morphologically-selected spiral galaxies, which excludes sources potentially have large recent changes their SFR. The are found yield relations with inconsistent slopes normalisations, suggesting differences between calibration...
In the currently debated context of using clusters galaxies as cosmological probes, need for well-defined cluster samples is critical. The XXL Survey has been specifically designed to provide a well characterised sample some 500 X-ray detected suitable studies. main goal present article make public and describe properties catalogue in its state, associated catalogues super-clusters fossil groups. We release containing 365 total. give details follow-up observations explain procedure adopted...
Galaxy mergers and interactions are an integral part of our basic understanding how galaxies grow evolve over time. However, the effect that galaxy have on star formation rates (SFR) is contested, with observations showing reduced, enhanced highly formation. We aim to determine SFR using statistically large samples galaxies, totalling 200\,000, a redshift range, 0.0 4.0. train use convolutional neural networks create binary merger identifications (merger or non-merger) in SDSS, KiDS CANDELS...
We explore trends in galaxy properties with Mpc-scale structures using catalogues of environment and large-scale structure from the Galaxy And Mass Assembly (GAMA) survey. Existing GAMA structure, group, pair membership allow us to construct stellar mass functions for different environmental types. To avoid simply extracting known underlying correlations between mass, we create a matched sample galaxies masses within 9.5 ≤ log M*/h−2 M⊙ 11 each population. Using these samples, show that...
The Deep Extragalactic VIsible Legacy Survey (DEVILS) is a large spectroscopic campaign at the Anglo-Australian Telescope (AAT) aimed bridging near and distant Universe by producing highest completeness survey of galaxies groups intermediate redshifts ($0.3<z<1.0$). Our sample consists $\sim$60,000 to Y$<$21.2mag, over $\sim$6deg$^{2}$ in three well-studied deep extragalactic fields (Cosmic Origins field, COSMOS, Extended Chandra Field South, ECDFS X-ray Multi-Mirror Mission Large-Scale...
Abstract Sampling-based inference techniques are central to modern cosmological data analysis; these methods, however, scale poorly with dimensionality and typically require approximate or intractable likelihoods. In this paper we describe how Truncated Marginal Neural Ratio Estimation ( tmnre ) (a new approach in so-called simulation-based inference) naturally evades issues, improving the i efficiency, ii scalability, iii trustworthiness of inference. Using measurements Cosmic Microwave...
We present a detailed investigation into the effects of galaxy environment on their star formation rates (SFRs) using galaxies observed in Galaxy And Mass Assembly (GAMA) survey. use three independent volume-limited samples within z < 0.2 and Mr −17.8. investigate known SFR–density relationship explore detail dependence SFR stellar mass density. show that trend is only visible when we include passive population along with star-forming population. This relation absent consider galaxies,...
The modification of star formation (SF) in galaxy interactions is a complex process, with SF observed to be both enhanced major mergers and suppressed minor pair interactions. Such changes likely arise on short timescales directly related the galaxy-galaxy interaction time. Here we investigate link between dynamical phase direct measures different for galaxies, targeting numerous star-formation rate (SFR) indicators comparing separation, individual mass ratio. We split our sample into higher...
This paper is the second in a pair of articles presenting data release 1 (DR1) Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS), largest single open-time key project carried out with Space Observatory. The H-ATLAS wide-area imaging survey five photometric bands at 100, 160, 250, 350 and 500$μ$m covering total area 600deg$^2$. In this we describe identification optical counterparts to submillimetre sources DR1, comprising an 161 deg$^2$ over three equatorial fields roughly...
We look for correlated changes in stellar mass and star formation rate (SFR) along filaments the cosmic web by examining masses UV-derived SFRs of 1799 ungrouped unpaired spiral galaxies that reside filaments. devise multiple distance metrics to characterize complex geometry filaments, find closer cylindrical centre a filament have higher than their counterparts near periphery on edges voids. In addition, these peripheral at given mass. Complementing our sample with tendrils voids, we...
We present a robust calibration of the 1.4 GHz radio continuum star formation rate (SFR) using combination Galaxy And Mass Assembly (GAMA) survey and Faint Images Radio Sky at Twenty-cm (FIRST) survey. identify individually detected GAMA–FIRST sources use late-type, non-active galactic nucleus, volume-limited sample from GAMA to produce stellar mass-selected samples. The latter are then combined FIRST-stacked images. This extends parametrization GHz–SFR relation faint luminosities. For both...
Recently a number of studies have found similarity between the passive fraction central and satellite galaxies when controlled for both stellar halo mass. These results suggest that quenching processes affect are largely agnostic to central/satellite status, which contradicts traditional picture increased via environmental such as stripping, strangulation starvation. Here we explore this further using Galaxy And Mass Assembly (GAMA) survey extends ~2dex lower in mass than SDSS, is more...
We present the properties of first 250 μm blind sample nearby galaxies (15 < D 46 Mpc) containing 42 objects from Herschel Astrophysical Terahertz Large Area Survey. Herschel's sensitivity probes faint end dust luminosity function for time, spanning a range stellar mass (7.4 M⋆ 11.3 log10 M⊙), star formation activity (−11.8 SSFR −8.9 yr−1), gas fraction (3–96 per cent), and colour (0.6 FUV–KS 7.0 mag). The median cold temperature is 14.6 K, colder than in Reference Survey (18.5 K) Planck...
Recently a number of studies have proposed that the dispersion along star formation rate - stellar mass relation ($\sigma_{\mathrm{sSFR}}$-M$_{*}$) is indicative variations in star-formation history (SFH) driven by feedback processes. They found 'U'-shaped and attribute increased scatter at low high masses to active galactic nuclei feed-back respectively. However, measuring $\sigma_{\mathrm{sSFR}}$ shape $\sigma_{\mathrm{sSFR}}$-M$_{*}$ problematic can vary dramatically depending on sample...
Parametric stochastic numerical simulators are ubiquitous in science.They model observed phenomena by mapping a parametric representation of simulation conditions to hypothetical observation-effectively sampling from probability distribution over observational data known as the likelihood.Simulators advantageous because they easily encode relevant scientific knowledge.Simulation-based inference (SBI) is machine learning technique which applies simulator, fitted statistical surrogate model,...
In this work we investigate in detail the effects local environment (groups and pairs) has on galaxies with stellar mass similar to Milky-Way (L* galaxies). A volume limited sample of 6,150 is classified determine emission features, morphological type presence a disk. This allows for characteristics be isolated (e.g. group halo mass), their codependencies determined. We observe that galaxy-galaxy interactions play most important role shaping evolution within halo, main gathering together...
Abstract We quantify the effect of galaxy group environment (for masses 10 12.5 –10 14.0 M ⊙ ) on current star formation rate (SFR) a pure, morphologically selected sample disk-dominated (i.e., late-type spiral) galaxies with redshift ≤0.13. The embraces full representation quiescent and star-forming disks stellar mass * ≥ 9.5 . focus effects SFR interactions between grouped putative intrahalo medium (IHM) their host dark matter halos, isolating these from those induced through galaxy–galaxy...
We report the discovery of a well-defined correlation between B-band face-on central optical depth due to dust, , and stellar mass surface density, μ*, nearby (z ⩽ 0.13) spiral galaxies: . This relation was derived from sample galaxies taken Galaxy Mass Assembly (GAMA) survey, which were detected in FIR/submillimeter (submm) Herschel-ATLAS science demonstration phase field. Using quantitative analysis NUV attenuation–inclination for complete samples GAMA spirals categorized according we...