Results 81 to 90 of about 12,901,041 (346)

Galaxy groups in the 2dF galaxy redshift survey: Large Scale Structure with Groups

, 2003
We use the 2dF Galaxy Group Catalogue constructed by Merch\'an & Zandivarez to study the large scale structure of the Universe traced by galaxy groups. We concentrate on the computation of the power spectrum and the two point correlation function.
Abadi, Ariel Zandivarez, Bahcall, Bahcall, Bean, Beers, Borgani, Colless, Collins, Couchman, Croft, Davis, Domínguez, Eisenstein, Feldman, Girardi, Girardi, Girardi, Governato, Hoyle, Huchra, Jing, Kaiser, Lahav, Landy, Maia, Manuel E. Merchán, Martínez, Martínez, Merchán, Merchán, Nelson D. Padilla, Netterfield, Norberg, Padilla, Padilla, Padilla, Padilla, Percival, Press, Ramella, Ratcliffe, Sheth, Sheth, Trasarti-Battistoni, Zandivarez   +45 more
core   +2 more sources

The DEEP2 galaxy redshift survey: the evolution of the blue fraction in groups and the field [PDF]

, 2007
We explore the behavior of the blue galaxy fraction over the redshift range 0.75
Coil, Alison L., Cooper, Michael C., Croton, Darren J., Davis, Marc, Faber, S. M., Gerke, Brian F., Guhathakurta, Puragra, Koo, David C., Newman, Jeffrey A., Weiner, Benjamin J., Willmer, Christopher N. A., Yan, Renbin   +11 more
core   +1 more source

Chandra view of Abell 407: the central compact group of galaxies and the interaction between the radio AGN and the ICM [PDF]

, 2022
Chao Qiang Geng, Chong Ge, D. Lal, Ming Sun, Li Ji, Haiguang Xu, Wenhao Liu, M. J. Hardcastle, W. Forman, Ralph Kraft, C. Jones   +10 more
openalex   +1 more source

GALAXY GROUPS [PDF]

, 2014
Galaxy groups can be characterized by the radius of decoupling from cosmic expansion, the radius of the caustic of second turnaround, and the velocity dispersion of galaxies within this latter radius.
R. Brent Tully
semanticscholar   +1 more source

Solid Harmonic Wavelet Bispectrum for Image Analysis

Advanced Science, EarlyView.
The Solid Harmonic Wavelet Bispectrum (SHWB), a rotation‐ and translation‐invariant descriptor that captures higher‐order (phase) correlations in signals, is introduced. Combining wavelet scattering, bispectral analysis, and group theory, SHWB achieves interpretable, data‐efficient representations and demonstrates competitive performance across texture,
Alex Brown, Mathilda Avirett‐Mackenzie, Carolin Villforth, Georgios Exarchakis   +3 more
wiley   +1 more source

Metallicity structure in X-ray bright galaxy groups

, 2006
Using Chandra X-ray data of a sample of 15 X-ray bright galaxy groups, we present preliminary results of a coherent study of the radial distribution of metal abundances in the hot gas in groups.
A. Finoguenov, A. Finoguenov, J.P.F. Osmond, K. Nomoto, K. Nomoto, N. Grevesse, T.J. Ponman   +6 more
core   +1 more source

The GEEC2 spectroscopic survey of Galaxy groups at 0.8 < z < 1 [PDF]

, 2014
We present the data release of the Gemini-South GMOS spectroscopy in the fields of 11 galaxy groups at $0.8 50$ per cent complete for galaxies within the virial radius, and with stellar mass $M_{\rm star}>10^{10.3}M_\odot$.
M. Balogh, S. McGee, A. Mok, D. Wilman, A. Finoguenov, R. Bower, J. Mulchaey, L. Parker, Masayuki Tanaka Waterloo, Leiden, McMaster, Mpie, Helsinki, Durham, Ociw, Naoj   +15 more
semanticscholar   +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

Groups and Protocluster Candidates in the CLAUDS and HSC-SSP Joint Deep Surveys

The Astrophysical Journal, 2022
Using the extended halo-based group finder developed by Yang et al., which is able to deal with galaxies via spectroscopic and photometric redshifts simultaneously, we construct galaxy group and candidate protocluster catalogs in a wide redshift range (0
Qingyang Li, Xiaohu Yang, Chengze Liu, Yipeng Jing, Min He, Jia-Sheng Huang, Y. Sophia Dai, Marcin Sawicki, Stephane Arnouts, Stephen Gwyn, Thibaud Moutard, H. J. Mo, Kai Wang, Antonios Katsianis, Weiguang Cui, Jiaxin Han, I-Non Chiu, Yizhou Gu, Haojie Xu   +18 more
doaj   +1 more source

X-ray bright groups and their galaxies [PDF]

, 2002
Combining X-ray data from the ROSAT PSPC and optical data drawn from the literature, we examine in detail the relationship between the X-ray and optical properties of X-ray bright galaxy groups. We find a relationship between optical luminosity and X-ray
Helsdon, Stephen F., Ponman, Trevor J.
core   +3 more sources