Witold Maciejewski
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View article: Extreme cloud collisions in nearby barred galaxies
Extreme cloud collisions in nearby barred galaxies Open
The inner regions of the Milky Way are known to contain an enigmatic population of prominent molecular clouds characterised by extremely broad lines. The physical origin of these ''extended velocity features'' (EVFs) is still debated, alth…
View article: Extreme cloud collisions in nearby barred galaxies
Extreme cloud collisions in nearby barred galaxies Open
The inner regions of the Milky Way are known to contain an enigmatic population of prominent molecular clouds characterized by extremely broad lines. The physical origin of these ‘extended velocity features’ (EVFs) is still debated, althou…
View article: Composite Bulges. III. A Study of Nuclear Star Clusters in Nearby Spiral Galaxies
Composite Bulges. III. A Study of Nuclear Star Clusters in Nearby Spiral Galaxies Open
We present photometric and morphological analyses of nuclear star clusters (NSCs)—very dense, massive star clusters present in the central regions of most galaxies—in a sample of 33 massive disk galaxies within 20 Mpc, part of the “Composi…
View article: Composite Bulges -- III. A Study of Nuclear Star Clusters in Nearby Spiral Galaxies
Composite Bulges -- III. A Study of Nuclear Star Clusters in Nearby Spiral Galaxies Open
We present photometric and morphological analyses of nuclear star clusters (NSCs) -- very dense, massive star clusters present in the central regions of most galaxies -- in a sample of 33 massive disk galaxies within 20 Mpc, part of the "C…
View article: Composite bulges – IV. Detecting signatures of gas inflows in the IFU data: the MUSE view of ionized gas kinematics in NGC 1097
Composite bulges – IV. Detecting signatures of gas inflows in the IFU data: the MUSE view of ionized gas kinematics in NGC 1097 Open
Using VLT/MUSE integral-field spectroscopic data for the barred spiral galaxy NGC 1097, we explore techniques that can be used to search for extended coherent shocks that can drive gas inflows in centres of galaxies. Such shocks should app…
View article: Composite Bulges -- IV. Detecting Signatures of Gas Inflows in the IFU data: The MUSE View of Ionized Gas Kinematics in NGC 1097
Composite Bulges -- IV. Detecting Signatures of Gas Inflows in the IFU data: The MUSE View of Ionized Gas Kinematics in NGC 1097 Open
Using VLT/MUSE integral-field spectroscopic data for the barred spiral galaxy NGC 1097, we explore techniques that can be used to search for extended coherent shocks that can drive gas inflows in centres of galaxies. Such shocks should app…
View article: Composite bulges – II. Classical bulges and nuclear discs in barred galaxies: the contrasting cases of NGC 4608 and NGC 4643
Composite bulges – II. Classical bulges and nuclear discs in barred galaxies: the contrasting cases of NGC 4608 and NGC 4643 Open
We present detailed morphological, photometric, and stellar-kinematic analyses of the central regions of two massive, early-type barred galaxies with nearly identical large-scale morphologies. Both have large, strong bars with prominent in…
View article: Ionized outflows in local luminous AGN: what are the real densities and outflow rates?
Ionized outflows in local luminous AGN: what are the real densities and outflow rates? Open
We report on the determination of electron densities, and their impact on the outflow masses and rates, measured in the central few hundred parsecs of 11 local luminous active galaxies. We show that the peak of the integrated line emission…
View article: The multiphase gas structure and kinematics in the circumnuclear region of NGC 5728
The multiphase gas structure and kinematics in the circumnuclear region of NGC 5728 Open
We report on our combined analysis of HST, VLT/MUSE, VLT/SINFONI, and ALMA observations of the local Seyfert 2 galaxy, NGC 5728 to investigate in detail the feeding and feedback of the active galactic nucleus (AGN). The data sets simultane…
View article: Galaxy and Mass Assembly (GAMA): variation in galaxy structure across the green valley
Galaxy and Mass Assembly (GAMA): variation in galaxy structure across the green valley Open
Using a sample of 472 local Universe (z<0.06) galaxies in the stellar mass\nrange 10.25 < log M*/M_sun < 10.75, we explore the variation in galaxy\nstructure as a function of morphology and galaxy colour. Our sample of galaxies\nis sub-div…
View article: LLAMA: normal star formation efficiencies of molecular gas in the centres of luminous Seyfert galaxies
LLAMA: normal star formation efficiencies of molecular gas in the centres of luminous Seyfert galaxies Open
Using new Atacama Pathfinder Experiment and James Clerk Maxwell Telescope spectroscopy of the CO 2→1 line, we undertake a controlled study of cold molecular gas in moderately luminous (Lbol = 1043–44.5 erg s−1) active galactic nuclei (AGN)…
View article: LLAMA: nuclear stellar properties of Swift-BAT AGN and matched inactive galaxies
LLAMA: nuclear stellar properties of Swift-BAT AGN and matched inactive galaxies Open
In a complete sample of local 14-195 keV selected AGNs and inactive galaxies,\nmatched by their host galaxy properties, we study the spatially resolved\nstellar kinematics and luminosity distributions at near-infrared wavelengths on\nscale…
View article: Constraints on the broad-line region properties and extinction in local Seyferts
Constraints on the broad-line region properties and extinction in local Seyferts Open
We use high-spectral resolution (R > 8000) data covering 3800-13 000 Å to study the physical conditions of the broad-line region (BLR) of nine nearby Seyfert 1 galaxies. Up to six broad H i lines are present in each spectrum. A comparison …
View article: INSIGHTS ON THE DUSTY TORUS AND NEUTRAL TORUS FROM OPTICAL AND X-RAY OBSCURATION IN A COMPLETE VOLUME LIMITED HARD X-RAY AGN SAMPLE
INSIGHTS ON THE DUSTY TORUS AND NEUTRAL TORUS FROM OPTICAL AND X-RAY OBSCURATION IN A COMPLETE VOLUME LIMITED HARD X-RAY AGN SAMPLE Open
We describe a complete volume limited sample of nearby active galaxies selected by their 14-195keV luminosity, and outline its rationale for studying the mechanisms regulating gas inflow and outflow. We describe also a complementary sample…
View article: Insights on the Dusty Torus and Neutral Torus from Optical and X-ray Obscuration in a Complete Volume Limited Hard X-ray AGN Sample
Insights on the Dusty Torus and Neutral Torus from Optical and X-ray Obscuration in a Complete Volume Limited Hard X-ray AGN Sample Open
We describe a complete volume limited sample of nearby active galaxies selected by their 14-195keV luminosity, and outline its rationale for studying the mechanisms regulating gas inflow and outflow. We describe also a complementary sample…