Results 31 to 40 of about 5,423 (262)

DELVE 6: An Ancient, Ultra-faint Star Cluster on the Outskirts of the Magellanic Clouds

The Astrophysical Journal Letters, 2023
We present the discovery of DELVE 6, an ultra-faint stellar system identified in the second data release of the DECam Local Volume Exploration (DELVE) survey. Based on a maximum-likelihood fit to its structure and stellar population, we find that DELVE 6
W. Cerny, A. Drlica-Wagner, T. S. Li, A. B. Pace, K. A. G. Olsen, N. E. D. Noël, R. P. van der Marel, J. L. Carlin, Y. Choi, D. Erkal, M. Geha, D. J. James, C. E. Martínez-Vázquez, P. Massana, G. E. Medina, A. E. Miller, B. Mutlu-Pakdil, D. L. Nidever, J. D. Sakowska, G. S. Stringfellow, J. A. Carballo-Bello, P. S. Ferguson, N. Kuropatkin, S. Mau, E. J. Tollerud, A. K. Vivas, DELVE Collaboration   +26 more
doaj   +1 more source

Exploring the Variable Sky with the Sloan Digital Sky Survey [PDF]

The Astronomical Journal, 2007
We quantify the variability of faint unresolved optical sources using a catalog based on multiple SDSS imaging observations. The catalog covers SDSS Stripe 82, and contains 58 million photometric observations in the SDSS ugriz system for 1.4 million unresolved sources.
Sesar, Branimir, Ivezic, Zeljko, Lupton, Robert H., Juric, Mario, Gunn, James E., Knapp, Gillian R., De Lee, Nathan, Smith, J. Allyn, Miknaitis, Gajus, Lin, Huan, Tucker, Douglas, Doi, Mamoru, Tanaka, Masayuki, Fukugita, Masataka, Holtzman, Jon, Kent, Steve, Yanny, Brian, Schlegel, David, Finkbeiner, Douglas, Padmanabhan, Nikhil, Rockosi, Constance M., Bond, Nicholas, Lee, Brian, Stoughton, Chris, Jester, Sebastian, Harris, Hugh, Harding, Paul, Brinkmann, Jon, Schneider, Donald P., York, Donald, Richmond, Michael W., Vanden Berk, Daniel   +31 more
openaire   +5 more sources

Molecular characterization of covRS mutations in M1UK Streptococcus pyogenes

FEBS Open Bio, EarlyView.
Group A Streptococcus (GAS) acquires covRS mutations driving a hypervirulent bacterial state, frequently associated with invasive disease‐like necrotizing fasciitis. We demonstrate that the newly emerged M1UK GAS lineage can also acquire these mutations.
Jarrad Pritchard, Emma‐Jayne Proctor, Jiawa Wang, Nikolas P. Johnston, Andrew Hayes, Georgia McCorkell, Haibo Yu, Jai Tree, Mark R. Davies, Mark J. Walker, Ronald Sluyter, Stephan Brouwer, Martina L. Sanderson‐Smith   +12 more
wiley   +1 more source

Searching for New Supernova Remnant Candidates from the VTSS Survey

Cumhuriyet Science Journal, 2022
The Virginia Tech Spectral Line Survey (VTSS) Galactic Plane Hydrogen-Alpha Survey has the strong ability to search and discover many different types of objects that cannot be identified clearly on red plates and by other Multi-Wavelength Sky Surveys ...
Elif Beklen
doaj   +1 more source

Surveying the Bright Sky [PDF]

Proceedings of the International Astronomical Union, 2011
AbstractThe AAVSO is initiating a new survey of the sky. It will cover the entire visible sky, both north and south, on a daily basis, in two colours, and with a limiting magnitude of V = 17. This will be a perfect complement to LSST, but will be available years earlier and will continue into the indefinite future.
openaire   +1 more source

Gravity‐Dependent Modulation of Downbeat Nystagmus: Insights From Velocity‐Storage Dysfunction

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Downbeat nystagmus varies with head position, a phenomenon termed gravity‐dependent modulation. We aimed to clarify its mechanism using a velocity‐storage model. Methods In 10 patients with downbeat nystagmus due to cerebellar disorders, we recorded eye movements at different pitch‐ and roll‐axis head positions.
Ji‐Hyung Park, Eun‐Hyuk Choi, Jorge Otero‐Millan, David S. Zee, Jeong‐Yoon Choi, Ji‐Soo Kim   +5 more
wiley   +1 more source

Optical Counterparts to X-Ray Sources in LSST DP1

The Astrophysical Journal Supplement Series
We present a crossmatch between a combined catalog of X-ray sources and the Vera C. Rubin Observatory Data Preview 1 (DP1) to identify optical counterparts.
Yuankun David Wang, Eric C. Bellm, Robert I. Hynes, Yue Zhao, Poshak Gandhi, Liliana Rivera Sandoval, Sandro Campos, Neven Caplar, Melissa DeLucchi, Konstantin Malanchev, Amy Secunda, Tobin M. Wainer   +11 more
doaj   +1 more source

The Dark Energy Camera Plane Survey 2 (DECaPS2): More Sky, Less Bias, and Better Uncertainties

The Astrophysical Journal Supplement Series, 2023
Deep optical and near-infrared imaging of the entire Galactic plane is essential for understanding our Galaxy’s stars, gas, and dust. The second data release of the Dark Energy Camera (DECam) Plane Survey extends the five-band optical and near-infrared ...
Andrew K. Saydjari, Edward F. Schlafly, Dustin Lang, Aaron M. Meisner, Gregory M. Green, Catherine Zucker, Ioana Zelko, Joshua S. Speagle, Tansu Daylan, Albert Lee, Francisco Valdes, David Schlegel, Douglas P. Finkbeiner   +12 more
doaj   +1 more source

A Q‐Learning Algorithm to Solve the Two‐Player Zero‐Sum Game Problem for Nonlinear Systems

International Journal of Adaptive Control and Signal Processing, Volume 39, Issue 3, Page 566-581, March 2025.
A Q‐learning algorithm to solve the two‐player zero‐sum game problem for nonlinear systems. ABSTRACT This paper deals with the two‐player zero‐sum game problem, which is a bounded L2$$ {L}_2 $$‐gain robust control problem. Finding an analytical solution to the complex Hamilton‐Jacobi‐Issacs (HJI) equation is a challenging task.
Afreen Islam, Anthony Siming Chen, Guido Herrmann   +2 more
wiley   +1 more source

The Future of Astrometry in Space

Frontiers in Astronomy and Space Sciences, 2018
This contribution focuses on the importance of astrometry and on its future developments. Over the centuries astrometry has greatly contributed to the advance of the knowledge of the Universe.
Antonella Vallenari
doaj   +1 more source