May 2025 (Page 3)

The Optical Design of the Carbon Investigation(Carbon-I) Imaging Spectrometer Christine L. Bradley, Rami W. Wehbe, Matthew Smith, Sharmila Padmanabhan, Valerie Scott, David R. Thompson, Daniel W. Wilson, Pantazis Mouroulis, Robert O. Green, Christian Frankenberg arXiv:2505.22545v1 Announce Type: cross Abstract: The proposed Carbon Investigation (Carbon-I) Imaging Spectrometer is designed to measure variations of greenhouse gases in Earth’s atmosphere. The instrument will survey the Earth from its own spacecraft at an altitude of approximately 610 km. It will use a coarse ground sampling distance (GSD) of arXiv:2505.22545v1 Announce Type: cross Abstract: The proposed Carbon Investigation (Carbon-I) Imaging Spectrometer is designed to measure variations of greenhouse gases inRead More →

Modified Newtonian Dynamics: Observational Successes and Failures Harry Desmond arXiv:2505.21638v1 Announce Type: new Abstract: Modified Newtonian Dynamics (MOND) is an alternative to the dark matter hypothesis that attempts to explain the “missing gravity” problem in astrophysics and cosmology through a modification to objects’ dynamics. Since its conception in 1983, MOND has had a chequered history. Some phenomena difficult to understand in standard cosmology MOND explains remarkably well, most notably galaxies’ radial dynamics encapsulated in the Radial Acceleration Relation. But for others it falls flat — mass discrepancies in clusters are not fully accounted for, the Solar System imposes a constraint on the shape of theRead More →

Exploring Faraday rotation signatures and population bounds for primordial magnetic black holes Arka Banerjee, Lalit Singh Bhandari, Ashwat Jain, Arun M. Thalapillil arXiv:2406.08728v2 Announce Type: replace Abstract: Primordial black holes bearing magnetic charges may bypass the constraints imposed by Hawking radiation, thereby enabling reasonable present-day populations, even for masses below $10^{15}, mathrm{g} $–a range previously considered improbable. They could, therefore, conceivably contribute to a component of dark matter. We investigate novel Faraday rotation signatures exhibited by primordial magnetic black holes while also establishing new Parker-type bounds on their populations. For the latter, we bound the dark matter fraction from intergalactic magnetic fields in cosmic voidsRead More →

First IFU observations of two GRB host galaxies at cosmic noon with JWST/NIRSpec B. Topc{c}u, P. Schady, S. Wuyts, A. Inkenhaag, M. Arabsalmani, H. -W. Chen, L. Christensen, V. D’Elia, J. P. U. Fynbo, K. E. Heintz, P. Jakobsson, T. Laskar, A. Levan, G. Pugliese, A. Rossi, R. L. C. Starling, N. R. Tanvir, P. Wiseman, R. M. Yates arXiv:2505.21643v1 Announce Type: new Abstract: Long gamma-ray bursts (GRBs) serve as powerful probes of distant galaxies. Their luminous afterglow pinpoints galaxies independent of luminosity, in contrast to most flux-limited surveys. Nevertheless, GRB-selected galaxy samples are not free from bias, instead tracing the conditions favoured by theRead More →

CO(1–0) imaging reveals 10-kiloparsec molecular gas reservoirs around star-forming galaxies at high redshift Matus Rybak, J. T. Jansen, M. Frias Castillo, J. A. Hodge, P. P. van der Werf, I. Smail, G. Calistro Rivera, S. Chapman, C. -C. Chen, E. da Cunha, H. Dannerbauer, E. F. Jim’enez-Andrade, C. Lagos, C. -L. Liao, E. J. Murphy, D. Scott, A. M. Swinbank, F. Walter arXiv:2411.06474v2 Announce Type: replace Abstract: Massive, intensely star-forming galaxies at high redshift require a supply of molecular gas from their gas reservoirs, replenished by infall from the surrounding circumgalactic medium, to sustain their immense star-formation rates. However, our knowledge of the extent andRead More →

Unified weak lensing constraints on the evolution of the mass — X-ray luminosity relation for galaxy clusters Isabel Pederneiras, Alexis Finoguenov, Eduardo Cypriano, Johan Comparat, Kimmo Kiiveri, Ludovic van Waerbeke, Renato Dupke arXiv:2505.21659v1 Announce Type: new Abstract: Scaling relations between galaxy cluster properties are crucial for understanding cosmology and baryonic physics. Rigorous calibration of the $M-L_X$ relation, employing weak lensing mass and consistent statistical methodology, is challenging due to heterogeneous cluster samples. The release of LEGACY imaging data introduced the possibility of unifying the cluster selection. We present the all-sky extension of the CODEX catalog based on LEGACY data and introduce a Bayesian framework forRead More →

Dark Energy Survey Year 6 Results: Synthetic-source Injection Across the Full Survey Using Balrog D. Anbajagane (DES Collaboration), M. Tabbutt (DES Collaboration), J. Beas-Gonzalez (DES Collaboration), B. Yanny (DES Collaboration), S. Everett (DES Collaboration), M. R. Becker (DES Collaboration), M. Yamamoto (DES Collaboration), E. Legnani (DES Collaboration), J. De Vicente (DES Collaboration), K. Bechtol (DES Collaboration), J. Elvin-Poole (DES Collaboration), G. M. Bernstein (DES Collaboration), A. Choi (DES Collaboration), M. Gatti (DES Collaboration), G. Giannini (DES Collaboration), R. A. Gruendl (DES Collaboration), M. Jarvis (DES Collaboration), S. Lee (DES Collaboration), J. Mena-Fern’andez (DES Collaboration), A. Porredon (DES Collaboration), M. Rodriguez-Monroy (DES Collaboration), E. Rozo (DESRead More →

Prospect of Constraining the EoS of Neutron Stars Using Post-Merger Signals Soham Mitra, Praveer Tiwari, Archana Pai arXiv:2505.21667v1 Announce Type: new Abstract: Post-merger gravitational-wave emission from a binary neutron star merger carries crucial information about the equation of state (EoS) of matter at high temperatures. Current gravitational wave detectors have limited sensitivities at post-merger frequencies in the range [1.5, 4] kHz. Therefore, valuable inferences can only be made after combining information from multiple (BNS) events. Criswell et al. [Phys. Rev. D 107, 043021 (2023)] carries out an injection study to infer the radius posterior for a $1.6 M_{odot}$ NS by combining the information from injectedRead More →

Galaxy Morphology Classification via Deep Semi-Supervised Learning with Limited Labeled Data Zhijian Luo, Jianzhen Chen, Zhu Chen, Shaohua Zhang, Liping Fu, Hubing Xiao, Chenggang Shu arXiv:2504.00500v2 Announce Type: replace Abstract: Galaxy morphology classification plays a crucial role in understanding the structure and evolution of the universe. With galaxy observation data growing exponentially, machine learning has become a core technology for this classification task. However, traditional machine learning methods predominantly rely on supervised learning frameworks, and their dependence on large of labeled samples limits practical applications. To address this challenge, we propose an innovative hybrid semi-supervised model, GC-SWGAN, designed to tackle galaxy morphology classification under conditionsRead More →

Diving into dangerous tides: The impact of galaxy cluster tidal environments on satellite galaxy mass densities Matias Bla~na, Thomas H. Puzia, Yasna Ordenes-Brice~no, Patricia B. Tissera, Marcelo D. Mora, Diego Pallero, Evelyn Johnston, Bryan Miller, Tuila Ziliotto, Paul Eigenthaler, Gaspar Galaz arXiv:2505.21713v1 Announce Type: new Abstract: Satellite galaxies endure powerful environmental tidal forces that drive mass stripping of their outer regions. Consequently, satellites located in central regions of galaxy clusters or groups, where the tidal field is strongest, are expected to retain their central dense regions while losing their outskirts. This process produces a spatial segregation in the mean mass density with the cluster-centric distanceRead More →