Results 41 to 50 of about 193,802 (285)

VERIFICATION OF MACHINE LEARNING METHODS FOR BINARY MORPHOLOGICAL CLASSIFICATION OF GALAXIES FROM SDSS

Odessa Astronomical Publications, 2019
We present a study on the verifica- tion of Machine Learning methods to be applied for binary morphological classification of galaxies. With this aim we used the sample of 60561 galaxies from the SDSSDR9 survey with a redshift of 0 . 02 < z < 0 .
M. Yu. Vasylenko, D. V. Dobrycheva, I. B. Vavilova, O. V. Melnyk, A. A. Elyiv   +4 more
doaj   +1 more source

The Origin of E+A Galaxies

, 2004
E+A galaxies are galaxies with strong Balmer absorption lines and with no significant emission in [OII] or H$ $ lines. The existence of strong Balmer absorption lines shows that these galaxies have experienced a starburst within the last 1 Gyr. At the same time, these galaxies do not show any sign of on-going star formation as indicated by the lack of
Goto, Tomotsugu, collaboration, the SDSS
openaire   +2 more sources

Low-surface-brightness Galaxies are Missing in the Observed Stellar Mass Function

The Astrophysical Journal, 2023
We investigate the impact of the surface-brightness (SB) limit on the galaxy stellar mass functions (GSMFs) using galaxy catalogs generated from the Horizon Run 5 ( HR5 ) simulation.
Juhan Kim, Jaehyun Lee, Clotilde Laigle, Yohan Dubois, Yonghwi Kim, Changbom Park, Christophe Pichon, Brad K. Gibson, C. Gareth Few, Jihye Shin, Owain Snaith   +10 more
doaj   +1 more source

Hdelta-Selected Galaxies in the Sloan Digital Sky Survey I: The Catalog

, 2003
[Abridged] We present here a new and homogeneous sample of 3340 galaxies selected from the Sloan Digital Sky Survey (SDSS) based solely on the observed strength of their Hdelta absorption line. These galaxies are commonly known as ``post-starburst'' or ``
Bernardi, Mariangela, Brinkmann, J., Castander, Francisco J., Connolly, Andrew, Fukugita, Masataka, Goto, Tomotsugu, Harvanek, Michael, Hopkins, Andrew, Ivezic, Zeljko, Kleinman, S. J., Krzesinski, Jurek, Long, Dan, Loveday, Jon, Miller, Christopher J., Neilsen, Eric H., Newman, Peter R., Nichol, Robert C., Nitta, Atsuko, Okamura, Sadanori, Sekiguchi, Maki, Snedden, Stephanie A., SubbaRao, Mark, Tremonti, Christy   +22 more
core   +1 more source

The AMIGA sample of isolated galaxies - II. Morphological refinement [PDF]

, 2005
We present a complete POSS II-based refinement of the optical morphologies for galaxies in the Karatchenseva's Catalog of Isolated Galaxies that forms the basis of the AMIGA project.
Bergond, G., Casanova, V., Durbala, A., Espada, D., Garcia, E., Leon, S., Lisenfeld, U., Sabater, J., Sota, A., Sulentic, J. W., Verdes-Montenegro, L., Verley, S.   +11 more
core   +10 more sources

Selecting Post-starburst Galaxies Based on Star Formation History

The Astrophysical Journal
Post-starburst (PSB) galaxies are galaxies that have undergone a large burst of star formation followed by rapid quenching. Understanding their properties as a population can help us better understand how galaxies evolve to quiescence.
Sara Starecheski, K. Decker French, Vicente Villanueva, Sebástion F. Sánchez, Tony Wong, Margaret E. Verrico, Alex Green, Akshat Tripathi, Keaton Donaghue   +8 more
doaj   +1 more source

Self‐Powered Flexible Triboelectric‐Gated Ion‐Gel Transistor for Neuromorphic Tactile Sensing and Human Activity Recognition

Advanced Materials, EarlyView.
A fully flexible ion‐gel‐gated graphene‐channel transistor driven by a triboelectric nanogenerator enables self‐powered tactile sensing and synaptic learning. Mimicking spike‐rate‐dependent plasticity, the device exhibits frequency‐selective potentiation and depression, supporting rate‐coded neuromorphic computation even under flex.
Hanseong Cho, Seoyeon Park, Youngmin Lee, Sejoon Lee   +3 more
wiley   +1 more source

What Are S0 Galaxies?

, 2009
The data collected in the Shapley-Ames catalog of bright galaxies show that lenticular (S0) galaxies are typically about a magnitude fainter than both elliptical (E) and early spiral (Sa) galaxies.
Hubble, Komatsu ., Sandage, Sandage, Sandage, Sidney van den Bergh   +5 more
core   +1 more source

Quantitative Morphology and Color Gradients of E+A Galaxies in Distant Galaxy Clusters [PDF]

, 1997
Narrow band multifilter photometry of the galaxy populations of four galaxy clusters at z=0.4-0.5 has provided us with a sample of 73 E+A galaxies which are secure cluster members. For 34 of them HST images are available (WFPC2). We have determined surface brigthness profiles and by means of an exponential or r^1/4 law fit we have classified the ...
openaire   +2 more sources

The Detailed Evolution of E+A Galaxies into Early Types [PDF]

The Astrophysical Journal, 2008
Post-starburst, or E+A galaxies, are the best candidates for galaxies in transition from being gas-rich and star-forming to gas-poor and passively-evolving via galaxy-galaxy mergers. To determine what E+A galaxies become after their young stellar populations fade away, we present the detailed morphologies of 21 E+As using HST images.
Yang, Yujin, Zabludoff, Ann, Zaritsky, Dennis, Mihos, Christopher   +3 more
openaire   +2 more sources