Next meeting:
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Author:
Moreom Akter, Wayne A. Barkhouse, Sandanuwan P Kalawila Vithanage, Gihan L. Gamage, Omar López-Cruz
Discussion leader:
Nobody volunteered yet
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Title:
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Votes: 1
1 month ago Author:
Andrey Sandomirsky, Re'em Sari, Aleksandra Olejak, Selma E. de Mink
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Votes: 1
1 month ago Author:
Alex Pedrini, Angela Adamo, Daniela Calzetti, Arjan Bik, Thomas J. Haworth, Bruce G. Elmegreen, Mark R. Krumholz, Sean T. Linden et al.
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Votes: 1
1 month ago
Title:
Stellar streams around dwarf galaxies are observationally rare in the local Universe
(View PDF)
Author:
Joanna D. Sakowska, David Martíınez-Delgado, Sarah Pearson, Francisco J. Riquel-Castilla, Tjitske K. Starkenburg, Giuseppe Donatiello, Alis Deason, Denis Erkal et al.
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Votes: 1
1 month ago
Title:
Infrared-excess sources in VVV: candidate debris discs, SED characterization, and variability analysis
(View PDF)
Author:
P. Esteves, R. K. Saito, C. Chavero, V. Fermiano, D. Minniti, B. W. Borges, C. Cáceres, Z. Guo et al.
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Votes: 1
1 month ago Author:
Momin Y. Khan, Barbara G. Castanheria
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2 months ago
Title: FAST Reveals New Evidence for M94 as a Merger
Link: https://iopscience.iop.org/article/10.3847/1538-4357/acdcf5/pdf
Description: A precursor to the paper on the starless galaxy candidate Cloud-9
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2 months ago
Title: The topology of the magnetic field in Abell 2255 out to its virial radius
Link: https://arxiv.org/abs/2607.14209
Description: We present the LOFAR Galaxy Cluster Ultra-Deep Field, in which 336 h of LOFAR observations at 120–168 MHz have been collected on the
nearby (z = 0.080) cluster Abell 2255. This massive and merging system is known to host spectacular radio emission from both cluster galaxies
and the intracluster medium. Previous LOFAR observations revealed pervasive diffuse synchrotron emission extending from the cluster center
to its dynamically active outskirts, tracing relativistic electrons propagating in large-scale magnetic fields. In this work, we present a set of new
ultra-deep images at the central frequency of 144 MHz based on the 224 h of data with the best quality, which reach a sensitivity of 24 µJy beam−1
at 7.1′′×4.3′′resolution. These images represent the deepest radio observations of a galaxy cluster obtained to date and provide a glimpse of what
should be routinely observed in clusters with SKA-Low in the near future. Using these data, we in
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2 months ago
Title: Ultra-Deep imaging of the starless galaxy candidate Cloud-9
Link: https://arxiv.org/abs/2608.20911v1
Description: We report the non-detection of stellar light associated with the dark galaxy candidate Cloud-9. Ultra-deep imaging obtained with HiPERCAM at the Gran Telescopio Canarias (GTC) reaches surface-brightness limits of 31.4 and 31.0 mag/arcsec2 in g and r, respectively, approximately ten times deeper than previous deep imaging of the region. No stellar emission is detected within the central 1
′
×
1
′
(
∼
1.3
×
1.3 kpc) region of Cloud-9. Assuming an old, metal-poor stellar population, these limits imply a stellar surface mass density of no more than
∼
0.01 M⊙/pc2 and an upper limit on the total stellar mass of 1.6
×
104 M⊙. This independent constraint from integrated light complements previous limits based on resolved-star counts and strengthens the case for Cloud-9 as a candidate starless galaxy.
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2 months ago
Title: A gas-enshrouded and gas-reddened black hole at cosmic dawn
Link: https://www.nature.com/articles/s41586-026-10846-4
Description: The physical processes that led to the formation of billion-solar-mass black holes within the first 700 million years of cosmic time, a period known as cosmic dawn, remain a puzzle1. Several theoretical scenarios have been proposed to seed and rapidly grow black holes2,3,4, but direct observations of these mechanisms remain elusive. Here we present a source 660 million years after the Big Bang that exhibits singular properties: among the largest hydrogen Balmer breaks reported at any redshift, broad multi-peaked Hβ emission, and Balmer line absorption in several transitions. We model this source as an enshrouded black hole in which the Balmer break and absorption features are a result of extremely dense, turbulent gas forming a dust-free envelope around a supermassive black hole5,6. This source may provide evidence of an early black hole embedded in dense gas—a theoretical configuration proposed to rapidly grow black holes by super-Eddington accretion7,8. Radiation from the black hole
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Votes: 1
2 months ago Author:
M. A. Burlak, A. V. Dodin, A. V. Zharova, S. G. Zheltoukhov, N. P. Ikonnikova, S. A. Lamzin, B. S. Safonov, I. A. Strakhov et al.
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