Results 51 to 60 of about 8,504 (230)

Dark Gaps and Resonances in Barred Galaxies

The Astrophysical Journal
Dark gaps, low surface brightness regions along the bar minor axis, are expected to form as a consequence of secular evolution in barred galaxies. Although several studies have proposed links between dark gap locations and dynamical resonances, the ...
Taehyun Kim, Dimitri A. Gadotti, Myeong-gu Park, Yun Hee Lee, Francesca Fragkoudi, Minjin Kim, Woong-Tae Kim   +6 more
doaj   +1 more source

The Panchromatic Hubble Andromeda Treasury: Triangulum Extended Region (PHATTER). V. The Structure of M33 in Resolved Stellar Populations

The Astrophysical Journal, 2023
We present a detailed analysis of the structure of the Local Group flocculent spiral galaxy M33, as measured using the Panchromatic Hubble Andromeda Treasury Triangulum Extended Region (PHATTER) survey. Leveraging the multiwavelength coverage of PHATTER,
Adam Smercina, Julianne J. Dalcanton, Benjamin F. Williams, Meredith J. Durbin, Margaret Lazzarini, Eric F. Bell, Yumi Choi, Andrew Dolphin, Karoline Gilbert, Puragra Guhathakurta, Eric W. Koch, Amanda C. N. Quirk, Hans-Walter Rix, Erik Rosolowsky, Anil Seth, Evan Skillman, Daniel R. Weisz   +16 more
doaj   +1 more source

Bar Diagnostics in Edge-On Spiral Galaxies. I. The Periodic Orbits Approach

, 1999
We develop diagnostics to detect the presence and orientation of a bar in an edge-on disk, using its kinematical signature in the position-velocity diagram (PVD) of a spiral galaxy observed edge-on.
Athanassoula E., Athanassoula E., Athanassoula E., Athanassoula E., Binney J., Bureau M., Combes F., Combes F., Contopoulos G., Contopoulos G., Contopoulos G., de Carvalho R. R., E. Athanassoula, Ferrers N. M., Fux R., Kalnajs A. J., Kuzmin G., M. Bureau, Mulder W. A., Papayannopoulos T., Pfenniger D., Schwarz M. P., Sparke L. S., Teuben P., van Albada T. S., Weiner B. J., Wozniak H.   +26 more
core   +1 more source

The Shape and Figure Rotation of NGC 2915's Dark Halo [PDF]

, 1999
NGC 2915 is a blue compact dwarf galaxy with a very extended HI disk showing a short central bar and extended spiral arms, both reaching far beyond the optical component.
Aoki S., Athanassoula E., Athanassoula E., Athanassoula E., Athanassoula E., Becquaert J.-F., Begeman K. G., Binney J. J., Binney J. J., Broeils A. H., Combes F., Combes F., Contopoulos G., D. W. Pfitzner, G. R. Meurer, Gerin M., Goldreich P., K. C. Freeman, Lequeux J., Lindblad P. A. B., Lindblad P. A. B., M. Bureau, Merrifield M. R., Meurer G. R., Noguchi M., Petrou M., Pfenniger D., Pfenniger D., Sancisi R., Schmidt K.-H., Schwarz M. P., Seiger M. S., Sellwood J. A., Sellwood J. A., Sellwood J. A., Sparke L. S., Sparke L. S., Sygnet J. F., Teuben P. J., Tully R. B., Weinberg M. D., Wilson T. L.   +41 more
core   +2 more sources

A hitchhiker's guide to modern, practical cyanobacterial taxonomy

Journal of Phycology, EarlyView.
Abstract There has been an explosion of new Cyanobacterial taxa described within the last two decades. Cyanobacteria exhibit incredible ecological versatility and morphological variability, and thousands of species have already been described using “traditional” approaches (e.g., morphological features).
Petr Dvořák, Svatopluk Skoupý, Aleksandar Stanojković, Jeffrey R. Johansen, Chelsea Villanueva, Patrick Jung, Laura Briegel‐Williams, H. Dail Laughinghouse IV, Forrest W. Lefler, David E. Berthold, Jan Kaštovský, Anne C. Hurley, Dale A. Casamatta   +12 more
wiley   +1 more source

The Illustris Simulation: Supermassive Black Hole - Galaxy Connection Beyond the Bulge

, 2017
We study the spiral arm morphology of a sample of the local spiral galaxies in the Illustris simulation and explore the supermassive black hole - galaxy connection beyond the bulge (e.g., spiral arm pitch angle, total stellar mass, dark matter mass, and ...
Berrier, Joel C., Hewitt, Ian B., Koval, Lauren E., Mutlu-Pakdil, Burçin, Seigar, Marc S., Treuthardt, Patrick   +5 more
core   +1 more source

The stellar dynamics of spiral arms in barred spiral galaxies [PDF]

Monthly Notices of the Royal Astronomical Society: Letters, 2006
Abstract A dynamical mechanism is proposed that explains the spiral structure observed frequently as a continuation of the bars in barred spiral galaxies. It is argued that the part of the spirals attached to the bar is due to chaotic orbits. These are chaotic orbits that exhibit for long time intervals a 4:1-resonance orbital behaviour.
openaire   +1 more source

Noble gases and nitrogen in material from asteroid Bennu

Meteoritics &Planetary Science, EarlyView.
Abstract We report the elemental and isotopic abundances of all stable noble gases (helium, neon, argon, krypton, and xenon) in eight particles from asteroid Bennu returned by NASA's OSIRIS‐REx mission. We also report nitrogen abundances and isotopic ratios that were analyzed alongside neon and argon in four additional Bennu particles.
B. Marty, L. Zimmermann, E. Füri, D. V. Bekaert, J. J. Barnes, A. N. Nguyen, H. C. Connolly, D. S. Lauretta   +7 more
wiley   +1 more source

Comparison of Bar Formation Mechanisms. II. Does a Tidally Induced Bar Grow Faster than an Internally Developed Bar?

The Astrophysical Journal
Bar structures can form internally due to the instability of their host galaxies or externally due to perturbations from other galaxies. We systematically quantify the growth timescales ( τ _bar ) of bars formed through these two mechanisms with a series
Yirui Zheng, Juntai Shen, Xufen Wu, Bin-Hui Chen   +3 more
doaj   +1 more source

Spiral Structure and Galaxy Environment

, 2002
Among 330 normal spirals of types Sa-Sc the fraction of objects exhibiting ``ring'', ``intermediate'' and ``spiral'' arm varieties does not correlated with environment.
Buta R., Buta R., de Vaucouleurs S., Sidney van den Bergh   +3 more
core   +2 more sources