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Nov 4, 2024 | 
academic.oup.com | Hernández Garnica |PO Box O |Max-Planck-Institut für Radioastronomie
Large conventional radio interferometers such as the Karl G. Jansky Very Large Array (VLA) or the Atacama Large Millimeter/submillimeter Array (ALMA) can routinely provide astrometric measurements with an accuracy of the order of 10 milliarcsec (mas–Loinard 2002; Rodríguez et al. 2003a; Chandler et al. 2005; Loinard et al. 2007; Dzib et al. 2017; Hernández-Gómez et al. 2019; Maureira et al. 2020).
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Oct 17, 2024 | 
academic.oup.com | Max-Planck-Institut für Radioastronomie |Denys Wilkinson Building |Keble Road
The double pulsar system PSR J0737−3039A/B is an extraordinary astrophysical laboratory that offers us a chance to directly probe the magnetic field of an active pulsar. Due to its almost edge-on orbit ( ; Hu et al. 2022; Askew et al. submitted) the 22.7 ms PSR J0737−3039A (‘pulsar A’; Burgay et al. 2003; Kramer et al. 2021a) is eclipsed for approximately 30–40 s every 2.4 h by the magnetosphere of the slower 2.77 s PSR J0737−3039B (‘pulsar B’; Lyne et al. 2004).
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Oct 9, 2024 | 
aanda.org | Nicolaus Copernicus |Le Tram |Max-Planck-Institut für Radioastronomie |Agata Karska
Home All issues Volume 690 (October 2024) A&A, 690 (2024) A191 Full HTML Issue A&A Volume 690, October 2024 Article Number A191 Number of page(s) 23 Section Interstellar and circumstellar matter DOI https://doi.org/10.1051/0004-6361/202348008 Published online 09 October 2024 A&A, 690, A191 (2024) Mapping and characterizing magnetic fields in the Rho Ophiuchus-A molecular cloud with SOFIA/HAWC+ 1,2★, 3, 1,3, 4,5, 6,7, 1, 6,7, 6,2, 3, 3, 8, 9 and 10 1 Institute of Astronomy, Faculty of Physics,...
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Aug 5, 2024 | 
academic.oup.com | Leibniz Universität Hannover |Max-Planck-Institut für Radioastronomie |Cape Town
The Sculptor Galaxy (NGC 253), located in the Southern Hemisphere, far off the Galactic Plane, has a relatively high star-formation rate of about 7 M yr−1 and hosts a young and bright stellar population, including several super star clusters and supernova remnants. It is also the first galaxy, apart from the Milky Way Galaxy to be associated with two giant magnetar flares. As such, it is a potential host of pulsars and/or fast radio bursts in the nearby Universe.
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Jul 11, 2024 | 
academic.oup.com | European Space Agency |Max-Planck-Institut für Radioastronomie |Departamento de Astronomía |Universidad de Chile
We report on the discovery of one of the most extreme cases of high-frequency radio variability ever measured in active galactic nuclei (AGN), observed on timescales of days and exhibiting variability amplitudes of three to four orders of magnitude. These sources, all radio-weak narrow-line Seyfert 1 (NLS1) galaxies, were discovered some years ago at Aalto University Metsähovi Radio Observatory (MRO) based on recurring flaring at 37 GHz, strongly indicating the presence of relativistic jets.
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Jul 10, 2024 | 
academic.oup.com | Denys Wilkinson Building |Keble Road |Magdalen College |Max-Planck-Institut für Radioastronomie
A key tool in the interpretation of the population of radio-emitting neutron stars is the diagram, where the rotational period P is plotted against its first time derivative . The rationale has always been that, assuming pulsars spin down due to the fact that they are rotating misaligned magnetic dipoles, one can easily draw on these diagrams lines of constant surface magnetic field and lines of constant characteristic age .
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Jul 8, 2024 | 
academic.oup.com | Max-Planck-Institut für Radioastronomie
The concept of pulsar timing arrays (PTAs) dates back to 1980s when it was proposed to directly detect gravitational waves (GWs) at nHz frequencies (Sazhin 1978; Detweiler 1979; Foster & Backer 1990) by monitoring the spatially correlated variations in the times of arrival (ToAs) of radio pulses from millisecond pulsars (MSPs).
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May 27, 2024 | 
academic.oup.com | Max-Planck-Institut für Radioastronomie
Future black hole (BH) imaging observations are expected to resolve finer features corresponding to higher-order images of hotspots and of the horizon-scale accretion flow. In spherical spacetimes, the image order is determined by the number of half-loops executed by the photons that form it. Consecutive-order images arrive approximately after a delay time of ≈π times the BH shadow radius.
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May 21, 2024 | 
academic.oup.com | Max-Planck-Institut für Radioastronomie |Cape Town |Leibniz Universität Hannover
The sensitivity of the MeerKAT radio interferometer is an opportunity to probe deeper into the population of rare and faint extragalactic pulsars. The TRAPUM (TRAnsients and PUlsars with MeerKAT) collaboration has conducted a radio-domain search for accelerated pulsars and transients in the Small Magellanic Cloud (SMC).
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May 20, 2024 | 
academic.oup.com | Max-Planck-Institut für Radioastronomie |Cape Town |Leibniz Universität Hannover
We present the description and initial results of the TRAPUM (TRAnsients And PUlsars with MeerKAT) search for pulsars associated with supernova remnants (SNRs), pulsar wind nebulae and unidentified TeV emission. The list of sources to be targeted includes a large number of well-known candidate pulsar locations but also new candidate SNRs identified using a range of criteria.
