Cluster-seminars December 2025

cluster-seminars@mailman.strw.leidenuniv.nl

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Reminder: Galaxy Cluster Seminar (STRW/SRON): Seminar on December 18th by Turgay Caglar (Texas A&M U.)
by Joshiwa van Marrewijk 18 Dec '25

18 Dec '25

Hi all, This is a reminder for the cluster seminar later today at 13.00 in room CEO:0.18. Again, this time we have a guest, Turgay Caglar from Texas A&M University, who will talk about X-ray and Radio Signatures of an Off-Axis Binary Cluster Merger: PSZ2 G279.79+39.09 As always, the talk will also be on Zoom, with the link: https://universiteitleiden.zoom.us/j/2134887101?pwd=4Xp5fL92aKbJ31umx3sLV04… We hope to see you there, online or in person. Kind regards, Kostas & Joshiwa Abstract: In this talk, we present an X-ray and radio analysis of the merging galaxy cluster system PSZ2 G279.79+39.09 (z=0.29) using XMM–Newton, Chandra, GMRT, and MeerKAT observations. The system is clearly bimodal, with the two subclusters separated by ~1.35 Mpc and showing comparable gas temperatures of ~5.4 keV. Both clusters exhibit disturbed morphologies and ram-pressure–stripped gas, including a prominent X-ray tail from the western subcluster. Thermodynamic maps reveal a hot, high-pressure bridge between the subcluster cores, and our radio data show diffuse emission that closely follows this X-ray bridge. From the temperature jump, we infer a weak merger shock with M~1.4 and a shock speed of ~1600 km/s. The combined X-ray and radio evidence indicates an off-axis merger observed near core passage, with a slightly higher likelihood of being in a pre-pericenter phase. ---------- Allegro/ALMA postdoc at Leiden Observatory, joshiwa.com <http://www.joshiwa.com/> > Begin forwarded message: > > From: Joshiwa van Marrewijk <marrewijk(a)strw.leidenuniv.nl> > Subject: Galaxy Cluster Seminar (STRW/SRON): Seminar on December 18th by Turgay Caglar (Texas A&M U.) > Date: 17 December 2025 at 14:34:44 GMT+1 > To: cluster-seminars(a)mailman.strw.leidenuniv.nl > > Dear all, > > The next STRW/SRON Galaxy Cluster Seminar is scheduled for next Thursday, December 18th, at 13:00, in CE0.18. This time we have a guest, Turgay Caglar from Texas A&M University, who will talk about: > > X-ray and Radio Signatures of an Off-Axis Binary Cluster Merger: PSZ2 G279.79+39.09 > > The abstract for the talk is at the end of this email. As always, the talk will also be on Zoom, with link: > > https://universiteitleiden.zoom.us/j/2134887101?pwd=4Xp5fL92aKbJ31umx3sLV04… > > The current schedule for the seminar can be found here: > https://home.strw.leidenuniv.nl/~kmigkas/clusterseminar.html > > We hope to see you all there. > > Cheers, > Kostas & Joshiwa > > > Abstract: In this talk, we present an X-ray and radio analysis of the merging galaxy cluster system PSZ2 G279.79+39.09 (z=0.29) using XMM–Newton, Chandra, GMRT, and MeerKAT observations. The system is clearly bimodal, with the two subclusters separated by ~1.35 Mpc and showing comparable gas temperatures of ~5.4 keV. Both clusters exhibit disturbed morphologies and ram-pressure–stripped gas, including a prominent X-ray tail from the western subcluster. Thermodynamic maps reveal a hot, high-pressure bridge between the subcluster cores, and our radio data show diffuse emission that closely follows this X-ray bridge. From the temperature jump, we infer a weak merger shock with M~1.4 and a shock speed of ~1600 km/s. The combined X-ray and radio evidence indicates an off-axis merger observed near core passage, with a slightly higher likelihood of being in a pre-pericenter phase. >

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