L. Gajović

The low-frequency flattening of the radio spectrum of giant HII regions in M 101

L. Gajović, V. Heesen, M. Brüggen, H. W. Edler et autres

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 properties of …

The low-frequency flattening of the radio spectrum of giant H II regions in M 101

L. Gajović, V. Heesen, M. Brüggen, H. W. Edler et autres

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 into the properties …

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diffSph: a Python tool to compute diffuse signals from dwarf spheroidal galaxies

M. Vollmann, Finn Welzmüller, L. Gajović

Abstract So far no diffuse emissions in dwarf spheroidal satellites of the Milky Way have ever been observed. Given that dwarf galaxies are predominantly composed of Dark Matter, the discovery of these signals could offer valuable insights into understanding the nature of …

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CHANG-ES

V. Heesen, T. Wiegert, J. Irwin, Roland M. Crocker et autres

Context. Cosmic rays may be dynamically very important in driving large-scale galactic winds. Edge-on galaxies give us an outsider’s view of radio haloes, and of their extra-planar cosmic-ray electrons and magnetic fields. Aims. We present a new radio continuum imaging study of …

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CHANG-ES XXXIV: a 20 kpc radio bubble in the halo of the star-forming galaxy NGC 4217

V. Heesen, T. Wiegert, J. Irwin, Roland M. Crocker et autres

Cosmic rays may be dynamically very important in driving large-scale galactic winds. Edge-on galaxies give us an outsider's view of the radio halo, which shows the presence of extra-planar cosmic-ray electrons and magnetic fields. We present a new radio continuum imaging study …

A spatially resolved radio spectral study of the galaxy M 51

L. Gajović, B. Adebahr, A. Basu, V. Heesen et autres

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 flattening. Aims. We wish to understand the origin of …

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Faraday tomography of LoTSS-DR2 data

A. Erceg, Vibor Jelić, M. Haverkorn, L. Gajović et autres

Context. The LOw-Frequency ARray (LOFAR) provides a unique opportunity to probe the magneto-ionised structure of our Galactic neighbourhood with great resolution. In this work, we present a new mosaic created with the second release of LOFAR Two-Metre Sky Survey data (LoTSS-DR2), which …

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Faraday tomography of LoTSS-DR2 data: III. Revealing the Local Bubble and the complex of local interstellar clouds in the high-latitude inner Galaxy

A. Erceg, Vibor Jelić, M. Haverkorn, L. Gajović et autres

In this work, we present a new mosaic created with the second release of LOFAR Two-Metre Sky Survey data (LoTSS-DR2), which probes polarised synchrotron emission in the high-latitude inner Galaxy. Our objective is to characterise the observed emission through multi-tracer analysis to …

diffSph: a Python tool to compute diffuse signals from dwarf spheroidal galaxies

M. Vollmann, Finn Welzmüller, L. Gajović

So far no diffuse emissions in dwarf spheroidal satellites of the Milky Way have ever been observed. Given that dwarf galaxies are predominantly composed of Dark Matter, the discovery of these signals could offer valuable insights into understanding the nature of Dark …

ViCTORIA project: The LOFAR view of environmental effects in Virgo cluster star-forming galaxies

H. W. Edler, Ian D. Roberts, A. Boselli, F. de Gasperin et autres

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 star-forming galaxies. Methods. We constructed …

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ViCTORIA project: The LOFAR-view of environmental effects in Virgo Cluster star-forming galaxies

H. W. Edler, Ian D. Roberts, A. Boselli, F. de Gasperin et autres

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 galaxies. We constructed a sample of 17 RPS …

Weakly interacting massive particle cross section limits from LOFAR observations of dwarf spheroidal galaxies

L. Gajović, Finn Welzmüller, V. Heesen, F. de Gasperin et autres

Context.Weakly interacting massive particles (WIMPs) can self-annihilate, thus providing us with a way to indirectly detect dark matter (DM). Dwarf spheroidal (dSph) galaxies are excellent places to search for annihilation signals because they are rich in DM and background emission is low. …

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