Results 21 to 30 of about 176,075 (225)

Structure and Evolution of Barred Spiral Galaxies, I [PDF]

Monthly Notices of the Royal Astronomical Society, 1966
K. C. Freeman
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Stellar populations in the center of barred spiral galaxies [PDF]

Proceedings of the International Astronomical Union, 2007
AbstractWe show observations obtained with the integral field spectrometer OASIS for the centers of a sample of barred galaxies. The high spatial resolution of the instrument allows to distinguish spatially some structures within these regions as defined by stellar populations of different ages and metallicities.
M. Mollá, S. Cantín, Carmelle Robert, Anne Pellerin   +3 more
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The Frequency of Barred Spiral Galaxies in the Near-Infrared [PDF]

The Astronomical Journal, 2000
We have determined the fraction of barred galaxies in the H-band for a statistically well-defined sample of 186 spirals drawn from the Ohio State University Bright Spiral Galaxy survey. We find 56% of our sample to be strongly barred at H, while another 16% is weakly barred. Only 27% of our sample is unbarred in the near-infrared.
Paul B. Eskridge, J. A. Frogel, Richard W. Pogge, Alice C. Quillen, Roger L. Davies, D. L. DePoy, M. L. Houdashelt, Leslie E. Kuchinski, Solange Ramírez, K. Sellgren, D. M. Terndrup, G. P. Tiede   +11 more
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Formation of Major Types of Galaxies Based on the Energy Circulation Theory

Reports in Advances of Physical Sciences, 2022
The standard cosmology can answer almost nothing about how the structure of a galaxy is formed. It expects a supermassive black hole at the center and dark matter in the halo to explain the circulation of stars and its velocity.
Shigeto Nagao
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A 2-3~mm high-resolution molecular line survey towards the centre of the nearby spiral galaxy NGC~6946 [PDF]

Astronomy & Astrophysics, 2022
The complex physical, kinematic, and chemical properties of galaxy centres make them interesting environments to examine with molecular line emission. We present new 2 − 4 ′′ ( ∼ 75 − 150 pc at 7 .
C. Eibensteiner, A. Barnes, F. Bigiel, E. Schinnerer, Daizhong Liu, D. Meier, A. Usero, A. Leroy, E. Rosolowsky, J. Puschnig, I. Lazar, J. Pety, L. Lopez, E. Emsellem, I. Bevsli'c, M. Querejeta, E. Murphy, J. D. Brok, A. Schruba, M. Chevance, S. Glover, Yu Gao, K. Grasha, H. Hassani, J. Henshaw, M. Jiménez-Donaire, R. Klessen, J. Kruijssen, H. Pan, T. Saito, M. Sormani, Y. Teng, T. H. M. F. Astronomie, U. Bonn, 71 AufdemHugel, 53121 Bonn, H Germany, M. F. Astronomie, 17 Konigstuhl, D. Heidelberg, Max-Planck-Institut fur extraterrestrische Physik, 1. Giessenbachstrasse, D. Garching, New Mexico Institute of Mining, Technology, 801 Leroy Place, Socorro, NM 87801, Usa, National Radio Astronomy Observatory, O. POBox, 1003 Lopezville Road, New Mexico 87801, O. Nacional, 3. CAlfonsoXII, E. Madrid, Spain., D. Astronomy, T. O. S. University, 4055 McPherson Laboratory, 140 West 18th Avenue, Columbus, OH 43210, 4-183 Ccis, U. Alberta, Edmonton, Alberta., T6G 2E1, Canada, Centre for Astrophysics Research, S. O. Physics, Astronomy, Mathematics, U. Hertfordshire, C. Lane, Hatfield AL10 9AB, Uk, Institute de Radio Astronomie Millim'etrique, 300 rue de la Piscine, F-38406 Saint Martin d'Heres, France., Lerma, O. Paris, P. university, Cnrs, Sorbonne Universit'es, 7. Paris, E. Observatory, 2. Karl-SchwarzschildStrasse, D-80805 Munchen, U. Lyon, Univ. Lyon1, É. Lyon, Centre de Recherche Astrophysique de Lyon UMR5574, Franklin France, 520 Edgemont Road, Charlottesville, VA 22903, A. Rechen-Institut, Zentrum fur Astronomie der Universitat Heidelberg, Monchhofstr. 12--14, 69117 Heidelberg, U. Heidelberg, Zentrum fur Astronomie, I. F. T. Astrophysik, 2. Albert-Ueberle-Strasse, Xiamen University, Xiamen, Fujian 361005, China., Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023, Research School for Astronomy, Astrophysics, Australian National University, Canberra, Act 2611, Australia, Interdisziplinares Zentrum fur Wissenschaftliches Rechnen, Inf 205, D. Physics, T. University, No.151, Ying Rd, Tamsui Dist., New Taipei City 251301, Taiwan, Center for Computational Astrophysics, S. Sciences, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093   +133 more
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The profiles of bars in spiral galaxies

Monthly Notices of the Royal Astronomical Society, 2023
ABSTRACT We present an analysis of major-axis surface-brightness profiles of bars in a volume-limited sample of 182 barred spiral galaxies, using Spitzer 3.6 $\mu$m images. Unlike most previous studies, we use the entire bar profile, and we classify profiles into four categories.
Peter Erwin, Victor P Debattista, Stuart Robert Anderson   +2 more
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ON THE FRACTION OF BARRED SPIRAL GALAXIES [PDF]

The Astrophysical Journal, 2010
We investigate the stellar masses of strongly barred spiral galaxies. Our analysis is based on a sample of ~14000 visually-classified nearby galaxies given in Nair & Abraham 2010(a). The fraction of barred spiral galaxies is found to be a strong function of stellar mass and star formation history, with a minimum near the characteristic mass at ...
Preethi Nair, Roberto Abraham
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First Look at z > 1 Bars in the Rest-frame Near-infrared with JWST Early CEERS Imaging

The Astrophysical Journal Letters, 2023
Stellar bars are key drivers of secular evolution in galaxies and can be effectively studied using rest-frame near-infrared (NIR) images, which trace the underlying stellar mass and are less impacted by dust and star formation than rest-frame UV or ...
Yuchen Guo, Shardha Jogee, Steven L. Finkelstein, Zilei Chen, Eden Wise, Micaela B. Bagley, Guillermo Barro, Stijn Wuyts, Dale D. Kocevski, Jeyhan S. Kartaltepe, Elizabeth J. McGrath, Henry C. Ferguson, Bahram Mobasher, Mauro Giavalisco, Ray A. Lucas, Jorge A. Zavala, Jennifer M. Lotz, Norman A. Grogin, Marc Huertas-Company, Jesús Vega-Ferrero, Nimish P. Hathi, Pablo Arrabal Haro, Mark Dickinson, Anton M. Koekemoer, Casey Papovich, Nor Pirzkal, L. Y. Aaron Yung, Bren E. Backhaus, Eric F. Bell, Antonello Calabrò, Nikko J. Cleri, Rosemary T. Coogan, M. C. Cooper, Luca Costantin, Darren Croton, Kelcey Davis, Avishai Dekel, Maximilien Franco, Jonathan P. Gardner, Benne W. Holwerda, Taylor A. Hutchison, Viraj Pandya, Pablo G. Pérez-González, Swara Ravindranath, Caitlin Rose, Jonathan R. Trump, Alexander de la Vega, Weichen Wang   +47 more
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On wave dark matter in spiral and barred galaxies [PDF]

Journal of Cosmology and Astroparticle Physics, 2015
We recover spiral and barred spiral patterns in disk galaxy simulations with a Wave Dark Matter (WDM) background (also known as Scalar Field Dark Matter (SFDM), Ultra-Light Axion (ULA) dark matter, and Bose-Einstein Condensate (BEC) dark matter). Here we show how the interaction between a baryonic disk and its Dark Matter Halo triggers the formation of
L. A. Martinez-Medina, Hubert L. Bray, Tonatiuh Matos   +2 more
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Photometry, Kinematics and Dynamics of the Magellanic-Type Barred Spiral Galaxy NGC 4027 [PDF]

, 1968
G. de Vaucouleurs, A. de Vaucouleurs, K. C. Freeman   +2 more
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