A5012298420- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Astrophysics and Star Formation Studies
University of Manchester
2021-2025
Technical University of Kenya
2021-2025
Abstract The origin of radio emission in radio-quiet (RQ) AGN remains a long-standing mystery. We present detailed study the cm to sub-mm from nucleus nearby prototypical RQ Seyfert 2 galaxy, NGC 1068. analyse observations between 4.5–706 GHz using e-MERLIN, VLA and ALMA. restricted all data used for imaging matching uv −range 15−3300 kλ, ensure that sampled same spatial scales. All images were restored with ∼ 0.06″ beam. To derive spectral energy distribution (SED), we fit synchrotron,...
The origin of radio emission in radio-quiet (RQ) AGN remains a long-standing mystery. We present detailed study the cm to sub-mm from nucleus nearby prototypical RQ Seyfert 2 galaxy, NGC 1068. analyse observations between 4.5-706 GHz using $e$-MERLIN, VLA and ALMA. restricted all data used for imaging matching $uv-$range 15$-$3300 k$\lambda$, ensure that sampled same spatial scales. All images were restored with $\sim$ 0.06$''$ beam. To derive spectral energy distribution (SED), we fit...
What determines the nuclear radio emission in local galaxies? We combine optical [O III] line emission, robust black hole (BH) mass estimates, and high-resolution e-MERLIN 1.5-GHz data, from LeMMINGs survey, of a statistically-complete sample 280 nearby, optically active (LINER Seyfert) inactive HII Absorption galaxies [ALG]) galaxies. Using luminosity ($L_{\rm [O~III]}$) as proxy for accretion power, follow distinct sequences optical-radio planes BH activity, which suggest different origins...
ABSTRACT We present new high-sensitivity e-MERLIN and Very Large Array (VLA) radio images of the prototypical Seyfert 2 galaxy NGC 1068 at 5, 10, 21 GHz. image jet, from compact components north-east (NE), C, S1, S2 to faint double-lobed jet structure NE south-west (SW) lobes. map between 15 kλ 3300 spatial scales by combining enhanced-Multi Element Radio Linked Interferometer Network (e-MERLIN) VLA data for first time. Components NE, have steep spectra indicative optically thin non-thermal...
ABSTRACT Multiwavelength studies indicate that nuclear activity and bulge properties are closely related, but the details remain unclear. To study this further, we combine Hubble Space Telescope structural photometric with 1.5 GHz, e-MERLIN radio continuum data from LeMMINGs survey for a large sample of 173 ‘active’ galaxies (LINERs Seyferts) ‘inactive’ (H iis absorption line galaxies, ALGs). Dividing our into active inactive, they define distinct (radio core luminosity)–(bulge mass),...
[Abridged] The relation between nuclear star clusters (NSCs) and the growth of central SMBHs, as well their connection to properties host galaxies, is crucial for understanding evolution galaxies. Recent observations have revealed that about 10 per cent nucleated galaxies hybrid nuclei, consisting both NSCs accreting SMBHs power active galactic nuclei (AGN). Motivated by potential recently published multi-wavelength data sets from LeMMINGs survey, here we present most thorough investigation...
ABSTRACT The relation between nuclear star clusters (NSCs) and the growth of central supermassive black holes (SMBHs), as well their connection to properties host galaxies, is crucial for understanding evolution galaxies. Recent observations have revealed that about 10 per cent nucleated galaxies hybrid nuclei, consisting both NSCs accreting SMBHs power active galactic nuclei (AGNs). Motivated by potential recently published multiwavelength data sets from LeMMINGs survey, here we present...
[Abridged] We use high-resolution $HST$ imaging and $e$-MERLIN 1.5-GHz observations of galaxy cores from the LeMMINGs survey to investigate relation between optical structural properties nuclear radio emission for a large sample galaxies. perform accurate, multi-component decompositions new surface brightness profiles extracted images 163 galaxies fit up six components (e.g., bulges, discs, AGN, bars, rings, spiral arms, star clusters) simultaneously with Sérsic and/or core-Sérsic models. By...
We used high-resolution HST imaging and e -MERLIN 1.5-GHz observations of galaxy cores from the LeMMINGs survey to investigate relation between optical structural properties nuclear radio emission for a large sample galaxies. performed accurate, multi-component decompositions new surface brightness profiles extracted images 163 galaxies fitted up six components (e.g. bulges, discs, AGN, bars, rings, spiral arms, star clusters) simultaneously with Sérsic and/or core-Sérsic models. By adding...
We present new high-sensitivity e-MERLIN and VLA radio images of the prototypical Seyfert 2 galaxy NGC 1068 at 5, 10 21 GHz. image jet, from compact components NE, C, S1 S2 to faint double-lobed jet structure NE SW lobes. Furthermore, we map between by combining data for first time. Components C have steep spectra indicative optically-thin non-thermal emission domination 5 Component S1, which is where AGN resides, has a flat spectrum. report component, S2a, part southern jet. compare these...
Multiwavelength studies indicate that nuclear activity and bulge properties are closely related, but the details remain unclear. To study this further, we combine $Hubble~Space~Telescope$ structural photometric with 1.5 GHz, $e$-MERLIN radio continuum data from LeMMINGs survey for a large sample of 173 `active' galaxies (LINERs Seyferts) `inactive' (H IIs absorption line galaxies, ALGs). Dividing our into active inactive, they define distinct (radio core luminosity)$-$(bulge mass),...