Results 111 to 120 of about 7,844 (220)

Surface photometry of barred spiral galaxies

The Astrophysical Journal, 1990
La photometrie de surface detaillee a ete realisee pour 6 galaxies spirales barrees de premier type en utilisant des plaques photographiques a haute resolution. Les observations et les reductions des donnees sont presentees et les profils azimutaux de la luminosite sont extraits et analyses.
Ken-Ichi Wakamatsu, Masaru Hamabe, Kouji Ohta   +2 more
openaire   +2 more sources

Chaotic Spiral Galaxies

, 2011
We study the role of asymptotic curves in supporting the spiral structure of a N-body model simulating a barred spiral galaxy. Chaotic orbits with initial conditions on the unstable asymptotic curves of the main unstable periodic orbits follow the shape ...
Contopoulos, George, Harsoula, Mirella
core   +1 more source

The Role of the Magnetic Field Orientation on the Variability of the Martian Topside Ionosphere Using MARSIS‐Mars Express Data

Journal of Geophysical Research: Planets, Volume 130, Issue 5, May 2025.
Abstract Mars, without a global dipole magnetic field, has its atmosphere directly exposed to the impinging solar wind, producing a complex interaction due to the remnant crustal magnetic fields, which, especially in the southern hemisphere, have spatially varying strengths and inclinations. “Mini‐magnetospheres” generated over the strong crustal field
Dikshita Meggi, Beatriz Sánchez‐Cano, Mark Lester, Simon Joyce, Katerina Stergiopoulou, Catherine Regan, David Andrews, Shaosui Xu, Xiaohua Fang, Olivier Witasse, Christopher M. Fowler   +10 more
wiley   +1 more source

Automated Detection of Galactic Rings from Sloan Digital Sky Survey Images

The Astrophysical Journal
Morphological features in galaxies—like spiral arms, bars, rings, and tidal tails, etc.—carry information about their structure, origin, and evolution.
Linn Abraham, Sheelu Abraham, Ajit K. Kembhavi, N. S. Philip, A. K. Aniyan, Sudhanshu Barway, Harish Kumar   +6 more
doaj   +1 more source

Secular Evolution and the Formation of Pseudobulges in Disk Galaxies

, 2004
We review internal processes of secular evolution in galaxy disks, concentrating on the buildup of dense central features that look like classical, merger-built bulges but that were made slowly out of disk gas. We call these pseudobulges. As an existence
Arp H, Arsenault R, Athanassoula E, Barbuy B, Bender R, Bender R, Bertin G, Bettoni D, Bica E, Bica E, Binggeli B, Binggeli B, Binney J, Binney J, Block DL, Bosma A, Bosma A, Braine J, Bresolin F, Brinchmann J, Buta R, Buta R, Carollo CM, Combes F, Combes F, Combes F, Contopoulos G, Contopoulos G, de Carvalho RR, de Jong RS, de Jong RS, de Jong RS, de Souza RE, de Vaucouleurs G, de Vaucouleurs G, Fall SM, Feltzing S, Friedli D, Friedli D, Friedli D, Gao Y, García-Barreto JA, García-Burillo S, Gerin M, Gerin M, Graham A, Hummel E, Jarvis BJ, Jogee S, Jogee S, John Kormendy, Kennicutt RC, Kormendy J, Kormendy J, Kormendy J, Lauberts A, Lauer TR, Lindblad B, Lindblad B, Lindblad PAB, Lütticke R, Martinet L, Merrifield MR, Mihalas D, Morgan WW, Möllenhoff C, Nilson P, Noguchi N, Pfenniger D, Pfenniger D, Pfenniger D, Phillips AC, Prendergast KH, Robert C. Kennicutt, Saglia RP, Sandage A, Sandage A, Sandage A, Sandage A, Schmidt AA, Scorza C, Seifert W, Sellwood JA, Shaw M, Shaw M, Shaw MA, Shen J, Sparke LS, Sérsic JL, Trager SC, van der Kruit PC, van der Kruit PC, van der Kruit PC, van der Kruit PC, van Driel W, Wozniak H   +95 more
core   +2 more sources

ALMA-LEGUS. II. The Influence of Subgalactic Environments on Molecular Cloud Properties

The Astrophysical Journal
We compare the molecular cloud properties in subgalactic regions of two galaxies, barred spiral NGC 1313, which is forming many massive clusters, and flocculent spiral NGC 7793, which is forming significantly fewer massive clusters despite having a ...
Molly K. Finn, Kelsey E. Johnson, Remy Indebetouw, Allison H. Costa, Angela Adamo, Alessandra Aloisi, Lauren Bittle, Daniela Calzetti, Daniel A. Dale, Clare L. Dobbs, Jennifer Donovan Meyer, Bruce G. Elmegreen, Debra M. Elmegreen, Michele Fumagalli, J. S. Gallagher, Kathryn Grasha, Eva K. Grebel, Robert C. Kennicutt, Mark R. Krumholz, Janice C. Lee, Matteo Messa, Preethi Nair, Elena Sabbi, Linda J. Smith, David A. Thilker, Bradley C. Whitmore, Aida Wofford   +26 more
doaj   +1 more source

Perspectives. [PDF]

AJNR Am J Neuroradiol, 2023
Ross JS.
europepmc   +1 more source

Bars do drive spiral density waves

, 2010
Recently, Buta etal. (2009) examined the question "Do Bars Drive Spiral Density Waves?", an idea supported by theoretical studies and also from a preliminary observational analysis Block etal (2004).
Athanassoula, Bertin, Binney, Block, Bosma, Buta, Buta, Buta, Buta, Elmegreen, Eskridge, Knapen, Lindblad, Masset, Rautiainen, Salo, Salo, Sellwood, Sellwood, Sellwood, Sheth, Sheth, Skrutskie, Speltincx, Toomre   +24 more
core   +1 more source

Tracing Coherent Gas Structures in the Central Region of the Starburst Galaxy NGC 253. II. Gas Excitation and Star Formation

The Astrophysical Journal
Molecular gas in the central region of the starburst galaxy NGC 253 is complicated because of the combination of different gas kinematics, including stellar feedback, noncircular motions, and magnetic activity.
Ryotaro Konishi, R. Enokiya, Y. Fukui, K. Tachihara, K. Muraoka, T. Onishi   +5 more
doaj   +1 more source

The Clearing Timescale for Infrared-selected Star Clusters in M83 with HST

The Astrophysical Journal Letters
We present an analysis of Hubble Space Telescope data from Wide Field Camera 3 (WFC3)/Ultraviolet Imaging Spectrometer, WFC3/IR, and the Advanced Camera for Surveys, investigating the young stellar cluster (YSC) population in the face-on spiral galaxy ...
Suyash Deshmukh, Sean T. Linden, Daniela Calzetti, Angela Adamo, Matteo Messa, Kathryn Grasha, Elena Sabbi, Linda Smith, Kelsey E. Johnson   +8 more
doaj   +1 more source