M. Kunert‐Bajraszewska
A5079256454- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Pulsars and Gravitational Waves Research
- GNSS positioning and interference
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Geophysics and Gravity Measurements
- Remote Sensing and LiDAR Applications
- High-pressure geophysics and materials
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
- Mechanics and Biomechanics Studies
- Particle accelerators and beam dynamics
- Antenna Design and Analysis
- Superconducting Materials and Applications
- Bluetooth and Wireless Communication Technologies
- Social Policies and Healthcare Reform
- Social and Demographic Issues in Germany
- Public Administration and Political Analysis
- Molecular Spectroscopy and Structure
Nicolaus Copernicus University
2005-2021
Nicolaus Copernicus Astronomical Center
2017
Center for Astrophysics Harvard & Smithsonian
2016
Centro de Astrobiología
2016
European Space Astronomy Centre
2016
Max Planck Innovation
2014
Max Planck Society
2014
The LOFAR Two-metre Sky Survey (LoTSS) is a deep 120-168 MHz imaging survey that will eventually cover the entire Northern sky. Each of 3170 pointings be observed for 8 hrs, which, at most declinations, sufficient to produce ~5arcsec resolution images with sensitivity ~0.1mJy/beam and accomplish main scientific aims which are explore formation evolution massive black holes, galaxies, clusters galaxies large-scale structure. Due compact core long baselines LOFAR, provide excellent both highly...
The LOFAR Two-metre Sky Survey (LoTSS) is an ongoing sensitive, high-resolution 120-168MHz survey of the entire northern sky for which observations are now 20% complete. We present our first full-quality public data release. For this release 424 square degrees, or 2% eventual coverage, in region HETDEX Spring Field (right ascension 10h45m00s to 15h30m00s and declination 45$^\circ$00$'$00$''$ 57$^\circ$00$'$00$''$) were mapped using a fully automated direction-dependent calibration imaging...
In this data release from the LOFAR Two-metre Sky Survey (LoTSS) we present 120-168MHz images covering 27% of northern sky. Our coverage is split into two regions centred at approximately 12h45m +44$^\circ$30' and 1h00m +28$^\circ$00' spanning 4178 1457 square degrees respectively. The were derived 3,451hrs (7.6PB) High Band Antenna which corrected for direction-independent instrumental properties as well direction-dependent ionospheric distortions during extensive, but fully automated,...
We present the source associations, cross-identifications, and multi-wavelength properties of faint radio population detected in deep tier LOFAR Two Metre Sky Survey (LoTSS): LoTSS Deep Fields. The first Fields data release consists imaging at 150~MHz ELAIS-N1, Lockman Hole, Bo\"{o}tes fields, down to RMS sensitives around 20, 22, 32$~\mu$Jy\,beam$^{-1}$, respectively. These fields are some best studied extra-galactic northern sky, with existing deep, wide-area panchromatic photometry from...
The Low Frequency Array (LOFAR) Two-metre Sky Survey (LoTSS) is a sensitive, high-resolution 120-168 MHz survey split across multiple tiers over the northern sky. first LoTSS Deep Fields data release consists of deep radio continuum imaging at 150 Bo\"{o}tes, European Large Area Infrared Space Observatory Survey-North 1 (ELAIS-N1), and Lockman Hole fields, down to rms sensitivities $\sim$32, 20, 22 $\mu$Jy beam$^{-1}$, respectively. In this paper we present consistent photometric redshift...
The second data release of the LOFAR Two-Metre Sky Survey (LoTSS) covers 27% northern sky, with a total area ~5700 deg 1 . high angular resolution Dutch baselines (6 arcsec) allows us to carry out optical identifications large fraction detected radio sources without further followup; however, process is made more challenging by many extended found in images as result its excellent sensitivity structure. In this paper we present source associations and for based on near-infrared data, using...
We present a new sample of Compact Steep Spectrum (CSS) sources with radio luminosity below 10^26 W/Hz at 1.4 GHz called the low compact (LLC) objects. The have been selected from FIRST survey and observed MERLIN L-band C-band. main criterion used for selection was objects approximately one third CSS value comparable to FRIs. About 80% resolved about 30% them weak extended emission disturbed structures when compared observations higher sources. studied correlation between power linear size,...
The LOFAR Two-metre Sky Survey (LoTSS) is an ongoing sensitive, high-resolution 120–168 MHz survey of the northern sky with diverse and ambitious science goals. Many scientific objectives LoTSS rely upon, or are enhanced by, association separation sometimes incorrectly catalogued radio components into distinct sources identification characterisation optical counterparts to these sources. We present source associations and/or IR identifications for in first data release, which made using a...
Only a small fraction of observed Active Galactic Nuclei display large-scale radio emission associated with jets, yet these radio-loud AGN have become increasingly important in models galaxy evolution. In determining the dynamics and energetics sources over cosmic time, key question concerns what happens when their jets switch off. The resulting `remnant' been surprisingly evasive past surveys, therefore statistical information on population dying phase is limited. this paper, recent...
Abstract We present multifrequency and high-resolution studies of a sample 24 radio transient sources discovered by comparing the NRAO VLA Sky Survey Very Large Array Survey. All them are characterized significant increase in flux density over past two decades. Their convex spectra, small sizes, high brightness temperatures typical for young GHz-peaked spectrum (GPS) indicative an active galactic nucleus (AGN) buried host galaxy. On other hand, they much weaker than archetypal GPS objects,...
We present a deep, low-frequency radio continuum study of the nearby Fanaroff--Riley class I (FR I) galaxy 3C 31 using combination LOw Frequency ARray (LOFAR; 30--85 and 115--178 MHz), Very Large Array (VLA; 290--420 Westerbork Synthesis Radio Telescope (WSRT; 609 MHz) Giant Metre (GMRT; 615 observations. Our new LOFAR 145-MHz map shows that has largest physical size $1.1$ Mpc in projection, which means now falls giant galaxies. model intensities with advective cosmic-ray transport, evolving...
The so-called HYbrid MOrphology Radio Sources (HYMORS) are a class of objects that appear to have mixed Fanaroff-Riley (FR) morphology in single object; i.e. HYMORS has an FR I-type lobe on one side its nucleus and II-type the other side. Because this unique feature given origin morphological dichotomy is still unclear, may possibly play crucial role our understanding FR-dichotomy. As number known quite small, we aimed increase by inspecting few areas sky covered VLA FIRST survey selecting...
We present LOFAR Low Band observations of the Bootes and 3C295 fields. Our images made at 34, 46, 62 MHz reach noise levels 12, 8, 5 mJy beam$^{-1}$, making them deepest ever obtained in this frequency range. In total, we detect between 300 400 sources each these images, covering an area 17 to 52 deg$^{2}$. From derive Euclidean-normalized differential source counts. The counts agree with previous GMRT 153 VLA 74 counts, scaling a spectral index $-0.7$. find that $-0.5$ is required match up...
Using observations obtained with the LOw Fequency ARray (LOFAR), Westerbork Synthesis Radio Telescope (WSRT) and archival Very Large Array (VLA) data, we have traced radio emission to large scales in complex source 4C 35.06 located core of galaxy cluster Abell 407. At higher spatial resolution (~4"), was known two inner lobes spanning 31 kpc a diffuse, low-brightness extension running parallel them, offset by about 11 (in projection). 62 MHz, detect this structure extending out 210 kpc. 1.4...
We present a study of the low-frequency radio properties broad absorption line quasars (BALQSOs) from LOFAR Two-metre Sky-Survey Data Release 1 (LDR1). The value-added LDR1 catalogue contains Pan-STARRS counterparts, which we match with Sloan Digital Sky Survey (SDSS) DR7 and DR12 quasar catalogues. find that BALQSOs are twice as likely to be detected at 144$\,$MHz than their non-BAL low-ionisation species in spectra three times more those only high-ionisation species. BALQSO fraction is...
We present the detection of 68 sources from most sensitive radio survey in circular polarisation conducted to date. use second data release 144 MHz LOFAR Two-metre Sky Survey produce circularly-polarised maps with median 140 $\mu$Jy beam$^{-1}$ noise and resolution 20$''$ for $\approx$27% northern sky (5634 deg$^{2}$). The leakage total intensity into is measured be $\approx$0.06%, our complete at flux densities $\geq1$ mJy. A considered reliable when fraction exceeds 1%. find population...
We report first X-ray Chandra observations of a sample seven low luminosity compact (LLC) sources. They belong to class young steep spectrum (CSS) radio Four them have been detected, the other three upper limit estimations for flux, one CSS galaxy is associated with an cluster. used new together observational data known strong and gigahertz-peaked (GPS) objects large scale FRIs FRIIs study relation between morphology, properties excitation modes in radio-loud AGNs. found that: (1) The power...
We have performed a search over 3440 deg$^2$ of Epoch 1 (2017-2019) the Very Large Array Sky Survey to identify unobscured quasars in optical ($0.2 < z 3.2$) and obscured active galactic nuclei (AGN) infrared that brightened dramatically radio past one two decades. These sources would been previously classified as "radio-quiet" based on upper limits from Faint Images Radio at Twenty Centimeters survey (1993-2011), but they are now consistent with "radio-loud" ($L_{\rm 3\,GHz} = 10^{40 - 42}...
Abstract A recent multiyear Caltech-NRAO Stripe 82 Survey revealed a group of objects that appeared as new radio sources after >5–20 yr absence. They are transient phenomena with respect to the Faint Images Radio Sky at Twenty Centimeters survey and constitute first unbiased sample renewed activity. Here we present follow-up, radio, optical, X-ray study them. The consists 12 sources, both quasars galaxies wide redshift (0.04 < z 1.7) luminosity ( <?CDATA $22\lt...
Context.Evidence has been mounting recently that activity in some radio-loud AGNs (RLAGNs) can cease shortly after ignition and perhaps even a majority of very compact sources may be short-lived phenomena because lack stable fuelling from the black hole. Thus, they fade out before having evolved to large, extended objects. Re-ignition such objects is not ruled out.