H. W. Edler
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View article: Simulating realistic radio continuum survey maps with diffusion models
Simulating realistic radio continuum survey maps with diffusion models Open
The next generation of radio surveys is going to be transformative for cosmology and other aspects of our understanding of astrophysics. Realistic simulations of radio observations are essential for the design and planning of radio surveys…
View article: A view of the CIZA J2242.8+5301 galaxy cluster at very low radio frequencies
A view of the CIZA J2242.8+5301 galaxy cluster at very low radio frequencies Open
The galaxy cluster CIZA J2242.8+5301 is a well-studied merging galaxy cluster that hosts prominent double radio relics including the famous sausage relic, as well as other diffuse radio sources. Observations at frequencies below 100 MHz ar…
View article: A view of the CIZA J2242.8+5301 galaxy cluster at very low radio frequencies
A view of the CIZA J2242.8+5301 galaxy cluster at very low radio frequencies Open
Context. The galaxy cluster CIZA J2242.8+5301 is a well-studied merging galaxy cluster that hosts prominent double radio relics including the famous sausage relic, as well as other diffuse radio sources. Observations at frequencies below 1…
View article: The low-frequency flattening of the radio spectrum of giant HII regions in M 101
The low-frequency flattening of the radio spectrum of giant HII regions in M 101 Open
In galaxies, the flattening of the spectrum at low radio frequencies below 300 MHz has been the subject of some debate. A turnover at low frequencies could be caused by multiple physical processes, which can yield new insights into the pro…
View article: The low-frequency flattening of the radio spectrum of giant H II regions in M 101
The low-frequency flattening of the radio spectrum of giant H II regions in M 101 Open
Context. In galaxies, the flattening of the spectrum at low radio frequencies below 300 MHz has been the subject of some debate. A turnover at low frequencies could be caused by multiple physical processes, which can yield new insights int…
View article: The ViCTORIA project
The ViCTORIA project Open
The Virgo cluster is the closest and richest nearby galaxy cluster. It is still in the formation process, with a number of sub-clusters undergoing merging and interactions. Although a great laboratory to study galaxy evolution and cluster …
View article: Ultra-low-frequency LOFAR spectral indices of cluster radio halos
Ultra-low-frequency LOFAR spectral indices of cluster radio halos Open
\nContext. A fraction of galaxy clusters harbor diffuse radio sources known as radio halos. The prevailing theory regarding their formation is based on second-order Fermi reacceleration of seed electrons caused by merger-driven turbulence …
View article: A spatially resolved radio spectral study of the galaxy M 51
A spatially resolved radio spectral study of the galaxy M 51 Open
Context. Radio continuum emission from galaxies at gigahertz frequencies can be used as an extinction-free tracer of star formation. However, at frequencies of a few hundred megahertz, there is evidence for low-frequency spectral flattenin…
View article: ViCTORIA project: The LOFAR-MeerKAT view of active galactic nuclei in Virgo cluster early-type galaxies
ViCTORIA project: The LOFAR-MeerKAT view of active galactic nuclei in Virgo cluster early-type galaxies Open
The evolution of active galactic nuclei (AGNs) is closely connected to their host galaxies and surroundings. Via feedback processes, AGNs can counteract the cooling of the intracluster medium (ICM) and suppress star formation in their host…
View article: Ultra-low-frequency LOFAR spectral indices of cluster radio halos
Ultra-low-frequency LOFAR spectral indices of cluster radio halos Open
Context. A fraction of galaxy clusters harbor diffuse radio sources known as radio halos. The prevailing theory regarding their formation is based on second-order Fermi reacceleration of seed electrons caused by merger-driven turbulence in…
View article: A 100 kpc ram pressure tail trailing the group galaxy NGC 2276
A 100 kpc ram pressure tail trailing the group galaxy NGC 2276 Open
We present the discovery of a 100 kpc low-frequency radio tail behind the nearby group galaxy, NGC 2276. The extent of this tail is a factor of ten larger than previously reported from higher-frequency radio and X-ray imaging. The radio mo…
View article: The SRG/eROSITA All-Sky Survey
The SRG/eROSITA All-Sky Survey Open
Context. As the closest galaxy cluster, the Virgo Cluster is an exemplary environment for the study of the large-scale filamentary structure and physical effects that are present in cluster outskirts but absent from the more easily studied…
View article: A 100 kpc Ram Pressure Tail Trailing the Group Galaxy NGC 2276
A 100 kpc Ram Pressure Tail Trailing the Group Galaxy NGC 2276 Open
We present the discovery of a 100 kpc low-frequency radio tail behind the nearby group galaxy, NGC 2276. The extent of this tail is a factor of ten larger than previously reported from higher-frequency radio and X-ray imaging. The radio mo…
View article: ViCTORIA project: The LOFAR-MeerKAT view of AGN in Virgo cluster early-type galaxies
ViCTORIA project: The LOFAR-MeerKAT view of AGN in Virgo cluster early-type galaxies Open
The evolution of Active Galactic Nuclei (AGN) is closely connected to their host galaxies and surroundings. Via feedback processes, AGN can counteract the cooling of the intracluster medium (ICM) and suppress star formation in their host g…
View article: The SRG/eROSITA All-Sky Survey: View of the Virgo Cluster
The SRG/eROSITA All-Sky Survey: View of the Virgo Cluster Open
As the closest galaxy cluster, the Virgo Cluster is an exemplary environment for the study of the large-scale filamentary structure and physical effects that are present in cluster outskirts but absent from the more easily studied inner re…
View article: Re-energisation of AGN head-tail radio galaxies in the galaxy cluster ZwCl0634.1+47474
Re-energisation of AGN head-tail radio galaxies in the galaxy cluster ZwCl0634.1+47474 Open
Low-frequency radio observations show an increasing number of radio galaxies located in galaxy clusters that display peculiar morphologies and spectral profiles. This is the result of the dynamical interaction of the galaxy with the surrou…
View article: ViCTORIA project: The LOFAR view of environmental effects in Virgo cluster star-forming galaxies
ViCTORIA project: The LOFAR view of environmental effects in Virgo cluster star-forming galaxies Open
Context. Environmental effects such as ram pressure stripping (RPS) shape the evolution of galaxies in dense regions. Aims. We used the nearby Virgo cluster as a laboratory to study the environmental effects on the nonthermal components of…
View article: Re-energization of AGN head–tail radio galaxies in the galaxy cluster ZwCl 0634.1+47474
Re-energization of AGN head–tail radio galaxies in the galaxy cluster ZwCl 0634.1+47474 Open
Low-frequency radio observations show an increasing number of radio galaxies located in galaxy clusters that display peculiar morphologies and spectral profiles. This is the result of the dynamical interaction of the galaxy with the surrou…
View article: Nearby galaxies in the LOFAR Two-metre Sky Survey
Nearby galaxies in the LOFAR Two-metre Sky Survey Open
Context. To understand galaxy evolution, it is essential to measure star formation rates (SFRs) across cosmic time. Aims. The use of radio continuum emission as an extinction-free tracer of star formation necessitates a good understanding …
View article: ViCTORIA project: The LOFAR-view of environmental effects in Virgo Cluster star-forming galaxies
ViCTORIA project: The LOFAR-view of environmental effects in Virgo Cluster star-forming galaxies Open
Environmental effects such as ram-pressure stripping (RPS) shape the evolution of galaxies in dense regions. We use the nearby Virgo cluster as a laboratory to study environmental effects on the non-thermal components of star-forming galax…
View article: Deep-learning-based radiointerferometric imaging with GAN-aided training
Deep-learning-based radiointerferometric imaging with GAN-aided training Open
Context. The incomplete coverage of the spatial Fourier space, which leads to imaging artifacts, has been troubling radio interferometry for a long time. The currently best technique is to create an image for which the visibility data are …
View article: Deep learning-based radiointerferometric imaging with GAN-aided training
Deep learning-based radiointerferometric imaging with GAN-aided training Open
Radio interferometry invariably suffers from an incomplete coverage of the spatial Fourier space, which leads to imaging artifacts. The current state-of-the-art technique is to create an image by Fourier-transforming the incomplete visibil…
View article: ViCTORIA project: MeerKAT H I observations of the ram pressure stripped galaxy NGC 4523
ViCTORIA project: MeerKAT H I observations of the ram pressure stripped galaxy NGC 4523 Open
We present the first results of a 21 cm H I line pilot observation carried out with the MeerKAT radio telescope in preparation for the ViCTORIA (Virgo Cluster multi Telescope Observations in Radio of Interacting galaxies and AGN) project, …
View article: ViCTORIA project: MeerKAT HI observations of the ram pressure stripped galaxy NGC 4523
ViCTORIA project: MeerKAT HI observations of the ram pressure stripped galaxy NGC 4523 Open
We present the first results of a 21 cm HI line pilot observation carried out with MeerKAT in preparation for the ViCTORIA project, an untargeted survey of the Virgo galaxy cluster. The extraordinary quality of the data in terms of sensiti…
View article: VICTORIA project: The LOFAR HBA Virgo Cluster Survey
VICTORIA project: The LOFAR HBA Virgo Cluster Survey Open
Context. The Virgo cluster is the nearest ( d = 16.5 Mpc) massive ( M ≥ 10 14 M ⊙ ) galaxy cluster and is therefore a prime target for studying astrophysical processes in dense large-scale environments. In the radio band, we can probe the …
View article: ViCTORIA project: The LOFAR HBA Virgo Cluster Survey
ViCTORIA project: The LOFAR HBA Virgo Cluster Survey Open
The Virgo cluster is the nearest massive galaxy cluster and thus a prime target to study astrophysical processes in dense large-scale environments. In the radio band, we can probe the non-thermal components of the inter-stellar medium (ISM…
View article: The LOFAR LBA Sky Survey
The LOFAR LBA Sky Survey Open
Context. The Low Frequency Array (LOFAR) is the only existing radio interferometer able to observe at ultra-low frequencies (<100 MHz) with high resolution (<15") and high sensitivity (<1 mJy beam −1 ). To exploit these capabilities, the L…
View article: The LOFAR LBA Sky Survey II. First data release
The LOFAR LBA Sky Survey II. First data release Open
The Low Frequency Array (LOFAR) is the only existing radio interferometer able to observe at ultra-low frequencies (<100 MHz) with high resolution (<15") and high sensitivity (<1 mJy/beam). To exploit these capabilities, the LOFAR Surveys …