Results 61 to 70 of about 153,388 (301)

Constraining galaxy cluster temperatures and redshifts with eROSITA survey data [PDF]

, 2014
The nature of dark energy is imprinted in the large-scale structure of the Universe and thus in the mass and redshift distribution of galaxy clusters. The upcoming eROSITA mission will exploit this method of probing dark energy by detecting roughly 100 ...
Borm, Katharina, Lovisari, Lorenzo, Mohammed, Irshad, Reiprich, Thomas H.   +3 more
core   +1 more source

Multitarget Recognition of Flower Images Based on Lightweight Deep Neural Network and Transfer Learning

Advanced Intelligent Systems, EarlyView.
This article proposes a lightweight YOLOv4‐based detection model using MobileNetV3 or CSPDarknet53_tiny, achieving 30+ FPS and higher mAP. It also presents a ShuffleNet‐based classification model with transfer learning and GAN‐augmented images, improving generalization and accuracy.
Qingyang Liu, Yanrong Hu, Hongjiu Liu
wiley   +1 more source

Bayesian Cluster Finder: Clusters in the CFHTLS Archive Research Survey

, 2011
The detection of galaxy clusters in present and future surveys enables measuring mass-to-light ratios, clustering properties, galaxy cluster abundances and therefore, constraining cosmological parameters.
Adami, Andreon, Ascaso, Ascaso, Ascaso, B. Ascaso, Baldry, Benítez, Blanton, Blanton, Botzler, Brown, Carlstrom, Chiaberge, Coleman, Couch, D. Wittman, Dalton, Demarco, Donahue, Dong, Eisenhardt, Erben, Gal, Gal, Galametz, Gladders, Gladders, Goto, Grazian, Grove, Hansen, Harsono, Huchra, Ilbert, Kepner, Kim, Kinney, Koester, Koester, Landy, Lidman, Lopes, López-Cruz, Mei, Mei, Menanteau, Milkeraitis, Miller, Moran, Muzzin, N. Benítez, Nakamura, Nakata, Navarro, Olsen, Pacaud, Postman, Postman, Postman, Ramella, Ramella, Rosati, Schechter, Schuecker, Shectman, Szabo, Treu, Tyson, van Breukelen, Way, White, Wilson, Wilson, Wittman, Wittman, Zaritsky, Zaritsky   +77 more
core   +1 more source

The 2dF Galaxy Redshift Survey: hierarchical galaxy clustering [PDF]

Monthly Notices of the Royal Astronomical Society, 2004
We use the Two-Degree Field Galaxy Redshift Survey (2dFGRS) to test the hierarchical scaling hypothesis: namely, that the p-point galaxy correlation functions can be written in terms of the two-point correlation function or variance. This scaling is expected if an initially Gaussian distribution of density fluctuations evolves under the action of ...
Baugh, C. M., Croton, Darren, Gaztañaga, E., Norberg, P., Colless, M., Baldry, I. K., Bland-Hawthorn, J., Bridges, T., Cannon, R., Cole, S., Collins, C., Couch, Warrick, Dalton, G., De Propris, R., Driver, S. P., Efstathiou, G., Ellis, R. S., Frenk, C. S., Glazebrook, Karl, Jackson, C., Lahav, O., Lewis, I., Lumsden, S., Maddox, S., Madgwick, D., Peacock, J. A., Peterson, B. A., Sutherland, W., Taylor, K.   +28 more
openaire   +4 more sources

Discovery and Initial Investigation of a New Low Surface Brightness Planetary Nebula Candidate at High Galactic Latitude

Astronomische Nachrichten, EarlyView.
ABSTRACT Planetary nebulae represent a late evolutionary phase of low‐ to intermediate‐mass stars. In this article, we present the serendipitous discovery of a previously unknown, faint potential Galactic planetary nebula (PN) in the constellation Camelopardalis, identified during a survey‐inspection, aiming at the detection of dwarf companions of the ...
W. E. Celnik, P. Köchling, S. Kotov, J. Kozok, Y. Galata, L. Magrini, A. Moiseev, M. Nischang, C. Reese, P. Remmel, P. Riepe, T. Zilch, K. Werner   +12 more
wiley   +1 more source

Spatially Resolved Stellar Populations of 0.3 < z < 6.0 Galaxies in WHL 0137–08 and MACS 0647+70 Clusters as Revealed by JWST: How Do Galaxies Grow and Quench over Cosmic Time?

The Astrophysical Journal, 2023
We study the spatially resolved stellar populations of 444 galaxies at 0.3 < z < 6.0 in two clusters (WHL 0137–08 and MACS 0647+70) and a blank field, combining imaging data from the Hubble Space Telescope and JWST to perform spatially resolved spectral ...
Abdurro’uf, Dan Coe, Intae Jung, Henry C. Ferguson, Gabriel Brammer, Kartheik G. Iyer, Larry D. Bradley, Pratika Dayal, Rogier A. Windhorst, Adi Zitrin, Ashish Kumar Meena, Masamune Oguri, Jose M. Diego, Vasily Kokorev, Paola Dimauro, Angela Adamo, Christopher J. Conselice, Brian Welch, Eros Vanzella, Tiger Yu-Yang Hsiao, Xinfeng Xu, Namrata Roy, Celia R. Mulcahey   +22 more
doaj   +1 more source

Measurement of the halo bias from stacked shear profiles of galaxy clusters

, 2014
We present the observational evidence of the 2-halo term in the stacked shear profile of a sample of about 1200 optically selected galaxy clusters based on imaging data and the public shear catalog from the CFHTLenS. We find that the halo bias, a measure
Cardone, Vincenzo F., Covone, Giovanni, Kilbinger, Martin, Sereno, Mauro   +3 more
core   +1 more source

Finding Galaxy Clusters using Voronoi Tessellations [PDF]

, 2001
We present an objective and automated procedure for detecting clusters of galaxies in imaging galaxy surveys. Our Voronoi Galaxy Cluster Finder (VGCF) uses galaxy positions and magnitudes to find clusters and determine their main features: size, richness
Basilakos, Boulade, D. Fadda, Doroshkevich, Ebeling, El-Ad, El-Ad, Fadda, Goldwirth, Holden, Icke, Ikeuchi, Kawasaki, Kepner, Kiang, Lidman, Lubin, M. Nonino, M. Ramella, Olsen, Pence, Phillips, Pisani, Plionis, Poggianti, Postman, Ramella, Ryden, Scodeggio, Struble, W. Boschin, Wang, Zaninetti   +32 more
core   +3 more sources

Galaxy and mass assembly (GAMA): projected galaxy clustering [PDF]

Monthly Notices of the Royal Astronomical Society, 2015
Accepted for publication by ...
Farrow, D.J., Cole, S., Norberg, P., Metcalfe, N., Baldry, I., Bland-Hawthorn, J., Brown, M.J.I., Hopkins, A.M., Lacey, C.G., Liske, J., Loveday, J., Palamara, D.P., Robotham, A.S.G., Sridhar, S.   +13 more
openaire   +6 more sources

Impact of filaments on galaxy cluster properties in The Three Hundred simulation [PDF]

EPJ Web of Conferences
Galaxy clusters and their filamentary outskirts reveal useful laboratories to test cosmological models and investigate Universe composition and evolution. Their environment, in particular the filaments of the Cosmic Web to which they are connected, plays
Santoni S., De Petris M., Ferragamo A., Yepes G., Cui W.   +4 more
doaj   +1 more source