- Lofar-group-meeting - mailing lists STRW

Next meeting Friday 15:00 in CE.0.08
by Scott Visser 10 Jul '25

10 Jul '25

Dear all, The next LOFAR group meeting will happen on Friday at 15:00 in CE.0.08. The schedule for presentations can be found here <https://docs.google.com/spreadsheets/d/1bKov20ETMfkOpjDzABpRKvN5oiGwS1NknI3…>. If you have a plot or update you want to briefly share, you can put it in the slides: https://docs.google.com/presentation/d/1tgzFJgfK_4asX-8xpuNKWMJDVqXe0v8DeGz… Zoom link: https://universiteitleiden.zoom.us/j/2749194787?pwd=wat21MUxoAgqC9146NFu920… <https://universiteitleiden.zoom.us/j/2749194787?pwd=wat21MUxoAgqC9146NFu920…><https://universiteitleiden.zoom.us/j/2749194787?pwd=wat21MUxoAgqC9146NFu920…> Best, Scott

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Fwd: Lofar5 /data1
by Reinout van Weeren 08 Jul '25

08 Jul '25

FYI Our system administrators are warning that data1 on the machine lofar5 is getting unstable and might fail soon. Given the lifetime of the disks of the data1 raid array they will not be replaced. So if you have data there you need to keep make sure to move it somewhere else. Cheers, Reinout > Begin forwarded message: > > From: Bram Venemans <venemans(a)strw.leidenuniv.nl> > Subject: Lofar5 /data1 > Date: 7 July 2025 at 17:13:54 CEST > To: Reinout van Weeren <rvweeren(a)strw.leidenuniv.nl> > Cc: Helpdesk STRW <helpdesk(a)strw.leidenuniv.nl> > > > Beste Reinout, > > Verschillende disks in de raid array /data1 van lofar5 staan op het punt van falen. Gezien de leeftijd van de server gaan wij de disks niet meer vervangen. Ons advies is om de data zo snel mogelijk van deze disk te halen en ergens anders op te slaan. Zou je dit kunnen doorgeven aan de lofar mensen die mogelijk data op de server hebben opgeslagen? Alvast bedankt! > > Met vriendelijke groet, > Bram > > > Dr. Bram Venemans > > ICT group STRW/LION > Office BM.4.20 > Gorlaeus Building > Einsteinweg 55 > 2333 CC Leiden > The Netherlands > Email: venemans(a)strw.leidenuniv.nl > Phone: +31 71 527 8469 > > > >

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Next meeting Friday 15:00 in CE.0.08
by Lars Abbo 03 Jul '25

03 Jul '25

Dear all, The next LOFAR group meeting will happen on Friday at 15:00 in CE.0.08. The schedule for presentations can be found here <https://docs.google.com/spreadsheets/d/1bKov20ETMfkOpjDzABpRKvN5oiGwS1NknI3…>. If you have a plot or update you want to briefly share, you can put it in the slides: https://docs.google.com/presentation/d/1tgzFJgfK_4asX-8xpuNKWMJDVqXe0v8DeGz… Zoom link: https://universiteitleiden.zoom.us/j/62610408145?pwd=jTfqIJV8RXbGqqcKTe9ueW… If you know someone who would like to be added to the mailing list, please feel free to contact me. Best, Lars

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No group meeting this week
by Lars Abbo 26 Jun '25

26 Jun '25

Dear all, There won't be a group meeting this week due to the soccer tournament and the BBQ. See you all next week! The schedule for presentations can be found here <https://docs.google.com/spreadsheets/d/1bKov20ETMfkOpjDzABpRKvN5oiGwS1NknI3…>. If you have a plot or update you want to briefly share, you can put it in the slides: https://docs.google.com/presentation/d/1tgzFJgfK_4asX-8xpuNKWMJDVqXe0v8DeGz… Zoom link: https://universiteitleiden.zoom.us/j/62610408145?pwd=jTfqIJV8RXbGqqcKTe9ueW… If you know someone who would like to be added to the mailing list, please feel free to contact me. Best, Lars

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No group meeting this week
by Lars Abbo 19 Jun '25

19 Jun '25

Dear all, There will be no group meeting this week due to Mariska's oratie. The schedule for presentations can be found here <https://docs.google.com/spreadsheets/d/1bKov20ETMfkOpjDzABpRKvN5oiGwS1NknI3…>. If you have a plot or update you want to briefly share, you can put it in the slides: https://docs.google.com/presentation/d/1tgzFJgfK_4asX-8xpuNKWMJDVqXe0v8DeGz… Zoom link: https://universiteitleiden.zoom.us/j/62610408145?pwd=jTfqIJV8RXbGqqcKTe9ueW… If you know someone who would like to be added to the mailing list, please feel free to contact me. Best, Lars

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Next meeting Friday 15:00 in CE.0.08
by Lars Abbo 12 Jun '25

12 Jun '25

Dear all, The next LOFAR group meeting will happen on Friday at 15:00 in CE.0.08. The schedule for presentations can be found here <https://docs.google.com/spreadsheets/d/1bKov20ETMfkOpjDzABpRKvN5oiGwS1NknI3…>. If you have a plot or update you want to briefly share, you can put it in the slides: https://docs.google.com/presentation/d/1tgzFJgfK_4asX-8xpuNKWMJDVqXe0v8DeGz… Zoom link: https://universiteitleiden.zoom.us/j/62610408145?pwd=jTfqIJV8RXbGqqcKTe9ueW… If you know someone who would like to be added to the mailing list, please feel free to contact me. Best, Lars

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Next meeting Friday 15:00 in CE.0.08
by Lars Abbo 05 Jun '25

05 Jun '25

Dear all, The next LOFAR group meeting will happen on Friday at 15:00 in CE.0.08. The schedule for presentations can be found here <https://docs.google.com/spreadsheets/d/1bKov20ETMfkOpjDzABpRKvN5oiGwS1NknI3…>. If you have a plot or update you want to briefly share, you can put it in the slides: https://docs.google.com/presentation/d/1tgzFJgfK_4asX-8xpuNKWMJDVqXe0v8DeGz… Zoom link: https://universiteitleiden.zoom.us/j/62610408145?pwd=jTfqIJV8RXbGqqcKTe9ueW… If you know someone who would like to be added to the mailing list, please feel free to contact me. Best, Lars

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Fwd: PhD Colloquium Christian Groeneveld
by Reinout van Weeren 02 Jun '25

02 Jun '25

> Begin forwarded message: > > From: Sterrewacht Colloquium Notifier <noreply(a)strw.leidenuniv.nl> > Subject: Leiden Colloquium Notification > Date: 2 June 2025 at 09:30:02 CEST > > > This weeks's PhDCol > > Speaker: Christian Groeneveld () > > Title: ''Galaxy clusters in the decametre sky'' > > Many galaxy clusters exhibit bright diffuse radio emission that traces > the underlying structure of the intracluster medium (ICM). Determining > the properties and uncovering the origin of this diffuse emission are > essential for understanding the fundamental physics of the plasma in > galaxy clusters. In particular, observations of diffuse emission in > galaxy clusters provide unique insights into magnetic fields permeating > the ICM, the merger history, and the nature of the relativistic > electron plasma resulting from ancient AGN outbursts. nDetecting > diffuse radio plasma in a large sample of galaxy clusters requires > deep, high-sensitivity observations with sufficient angular resolution > to accurately subtract compact sources. This is now feasible thanks to > the Low-Frequency Array (LOFAR). In particular, the low-band antenna > (LBA) allows us to observe diffuse emission at ultra-low radio > frequencies. In this presentation, we present novel calibration > strategies that allow us to reduce LOFAR LBA data at unprecedented low > frequencies (between 10-30 MHz), as well as LOFAR LBA data with > international baselines. > > Date: Monday 2025-06-02 > Time: 13:15 > Location: BE 0.18 > Host: > > > >

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Next meeting Friday 15:00 in CE.0.08
by Lars Abbo 22 May '25

22 May '25

Dear all, The next LOFAR group meeting will happen on Friday at 15:00 in CE.0.08. The schedule for presentations can be found here <https://docs.google.com/spreadsheets/d/1bKov20ETMfkOpjDzABpRKvN5oiGwS1NknI3…>. If you have a plot or update you want to briefly share, you can put it in the slides: https://docs.google.com/presentation/d/1tgzFJgfK_4asX-8xpuNKWMJDVqXe0v8DeGz… Zoom link: https://universiteitleiden.zoom.us/j/62610408145?pwd=jTfqIJV8RXbGqqcKTe9ueW… If you know someone who would like to be added to the mailing list, please feel free to contact me. Best, Lars

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Seminar on Galaxy Clusters: May 15th, Wonki Lee
by Lars Abbo 21 May '25

21 May '25

For those of you interested in galaxy clusters: Dear all, In our next Galaxy Cluster Seminar this Thursday, May 22nd, 13:00, in the CE 0.12 room and through Zoom (the link will be shared in a few days), we will have a guest speaker. The speaker is Dr. Wonki Lee from Yonsei University, Seoul. Wonki will present his research on radio relics in merging galaxy clusters using simulations. Wonki is visiting us starting today and until the end of this week. The title and abstract of Wonki's talk can be found at the end of the email. The seminar schedule can be found here: https://home.strw.leidenuniv.nl/~kmigkas/clusterseminar.html Cheers, Kostas Title: Why Do We Need More Relics? Statistical Analysis of Radio Relics Using Numerical Simulations Abstract: Radio relics are diffuse synchrotron sources located in the outskirts of merging galaxy clusters, energized by merger shocks. With the growing number of relics discovered by current and upcoming radio surveys, we are entering a new era where statistical studies of relics have become feasible. In this talk, I will show how relic statistics can provide new insights into cluster astrophysics. Using a large library of radio relics extracted from the TNG-Cluster, a suite of cosmological MHD zoom-in simulations of massive galaxy clusters, we find that radio relics serve as robust tracers of the merger history of their host clusters. Additionally, we show that the statistical distribution of luminosity asymmetry in double relics can be reproduced without assuming inhomogeneous acceleration, offering a new test for acceleration models. Finally, using numerical simulations with alternative dark matter models, we demonstrate that relic separation provides a reliable reference for probing the self-interacting nature of dark matter. These approaches require a large sample of relics from both observations and simulations, emphasizing the synergy enabled by future radio surveys and numerical simulations.

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2025

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