Spatial sparse sampling-based iterative optimization framework for GNSS Direct Position Estimation

Posted by klaurent Caltech

Kavli Affiliate: Wei Gao| Summary:Direct position estimation (DPE), a promising technique in Global Navigation Satellite Systems (GNSS) receivers, enables estimation of position, velocity, and time (PVT) solutions directly from correlator outputs. The conventional grid search (GS)-based DPE is computationally intensive, as it relies solely on locating the peak of the cross ambiguity function (CAF), and […]


Continue.. Spatial sparse sampling-based iterative optimization framework for GNSS Direct Position Estimation

The FU Ori outburst of PR Ori B

Posted by klaurent Peking

Kavli Affiliate: Gregory Herczeg | Summary:We report the discovery of a nearby FU Ori-type outburst (FUor), PR Ori B, in the L1641 cluster of the Orion star-forming region. The high-amplitude variability was first identified in the NEOWISE (3-5 $μ$m) photometry of the unresolved PR Ori binary system. Long-term, resolved optical photometric monitoring demonstrates that PR […]


Continue.. The FU Ori outburst of PR Ori B

High Resolution Spectroscopic Follow-up Observation Results for 13 EMP Candidates Selected by Narrow-band Photometry

Posted by klaurent Peking

Kavli Affiliate: Huawei Zhang | Summary:Extremely metal-poor (EMP; [Fe/H] < -3.0) stars preserve key information about the earliest stages of Galactic chemical evolution. Based on a training set of spectroscopic metallicities, we constructed catalogs of more than 120,000 EMP candidates from large-scale narrow-band photometric surveys. To validate this approach, we obtained high-resolution CFHT/ESPaDOnS spectra for […]


Continue.. High Resolution Spectroscopic Follow-up Observation Results for 13 EMP Candidates Selected by Narrow-band Photometry

High Resolution Spectroscopic Follow-up Observation Results for 13 EMP Candidates Selected by Narrow-band Photometry

Posted by klaurent Peking

Kavli Affiliate: Huawei Zhang | Summary:Extremely metal-poor (EMP; [Fe/H] < -3.0) stars preserve key information about the earliest stages of Galactic chemical evolution. Based on a training set of spectroscopic metallicities, we constructed catalogs of more than 120,000 EMP candidates from large-scale narrow-band photometric surveys. To validate this approach, we obtained high-resolution CFHT/ESPaDOnS spectra for […]


Continue.. High Resolution Spectroscopic Follow-up Observation Results for 13 EMP Candidates Selected by Narrow-band Photometry

The future of high-resolution UV spectroscopy: Science with a UV Échelle spectrograph on the Habitable Worlds Observatory, or a dedicated mission

Posted by klaurent Cambridge

Kavli Affiliate: Roberto Maiolino | Summary:High-resolution UV spectroscopy serves a diversity of science cases, from small bodies to planets, stars, and galaxies, but is currently limited to the Hubble Space Telescope and bright targets. Major advances require increasing sensitivity by at least one order of magnitude. Here we present the UV science cases for PEGASUS […]


Continue.. The future of high-resolution UV spectroscopy: Science with a UV Échelle spectrograph on the Habitable Worlds Observatory, or a dedicated mission

Overmassive No More: The Case for Little Red Dots Hosting Black Hole Seeds as Massive as Single Supermassive Stars

Posted by klaurent MIT

Kavli Affiliate: Robert Simcoe | Summary:Little Red Dots (LRDs) display singular properties unlike any known class of AGN or galaxies, motivating novel mass estimators for their central engines. Inspired by their similarities to stellar phenomena, here we interpret the LRD continuum as being produced by a pseudo-photosphere. We fit tailored stellar atmosphere models to host-subtracted […]


Continue.. Overmassive No More: The Case for Little Red Dots Hosting Black Hole Seeds as Massive as Single Supermassive Stars

RIGEL: Ultra-faint dwarf galaxy diversity shaped by inhomogeneous cosmic reionization

Posted by klaurent MIT

Kavli Affiliate: Mark Vogelsberger | Summary:Ultra-faint dwarf galaxies (UFDs) are among the smallest and oldest galaxies in the Universe and are widely regarded as relics of cosmic reionization. To investigate how reionization quenches star formation and shapes the diversity of UFDs, we present a suite of eight cosmological zoom-in simulations of isolated UFDs with present-day […]


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SHELLQs. Black Hole Mass and Eddington Ratio Distributions of Intermediate-Luminosity Quasars at 6

Posted by klaurent Peking

Kavli Affiliate: Kohei Inayoshi | Summary:We present near-infrared spectroscopy of 21 quasars at 6.07 < z < 6.90 obtained with JWST/NIRSpec and Subaru/MOIRCS. These targets have absolute ultraviolet magnitudes of -25 < M_1450 < -22 and are drawn from a sample of z>6 quasars identified in the Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) project. […]


Continue.. SHELLQs. Black Hole Mass and Eddington Ratio Distributions of Intermediate-Luminosity Quasars at 6

Lipid Activation of a Thalamic GPCR Extends Working Memory Time-scales

Posted by dbos Rockefeller

Kavli Affiliate: Vanessa Ruta and Priya Rajasethupathy | Authors: James Newton Brandt, Alessandra Bonito-Oliva, Navid Paknejad, Celine Chen, John J Fak, Andrew Luskin, Genelle Rankin, Miriam Kirylo, Leslie J Sibener, Amy Arnsten, Vanessa Ruta and Priya Rajasethupathy | Summary: Working memory capacity is poorly understood. The ability to control and extend working memory time-scales provides […]


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Gonadal remodelling in socially driven sex change is associated with novel and known sex genes, epigenetic reprogramming, and inflammation-mediated apoptosis.

Posted by dbos Rockefeller

Kavli Affiliate: Erich Jarvis | Authors: Chloé A van der Burg, Alexander A Goikoetxea, Simon Muncaster, Oscar Ortega-Recalde, Tim Hore, Kaj Kamstra, Olivier Fedrigo, Erich D Jarvis, Alan Tracey, Kerstin Howe, Erica V Todd and Neil Gemmell | Summary: Many fish undergo dramatic, socially cued female-to-male sex change, yet the events that initiate and then […]


Continue.. Gonadal remodelling in socially driven sex change is associated with novel and known sex genes, epigenetic reprogramming, and inflammation-mediated apoptosis.