Results 61 to 70 of about 67,629 (216)

Automated Quantitative Description of Spiral Galaxy Arm-Segment Structure [PDF]

, 2013
We describe a system for the automatic quantification of structure in spiral galaxies. This enables translation of sky survey images into data needed to help address fundamental astrophysical questions such as the origin of spiral structure---a ...
Davis, Darren, Hayes, Wayne
core  

Measurement of Galactic Logarithmic Spiral Arm Pitch Angle Using Two-Dimensional Fast Fourier Transform Decomposition

, 2012
A logarithmic spiral is a prominent feature appearing in a majority of observed galaxies. This feature has long been associated with the traditional Hubble classification scheme, but historical quotes of pitch angle of spiral galaxies have been almost ...
Barden, Barger, Benjamin L. Davis, Claud H. S. Lacy, Considere, Daniel Kennefick, Davis, de Vaucouleurs, Douglas W. Shields, Eskridge, Ferrarese, Gebhardt, Gebhardt, Graham, Grosbol, Herschel, Ho, Häring, Ivânio Puerari, Jedrzejewski, Joel C. Berrier, Julia Kennefick, Kormendy, Ma, Magorrian, Marc S. Seigar, Marconi, Martínez-García, Press, Puerari, Puerari, Saraiva Schroeder, Seiden, Seigar, Seigar, Sérsic, Thornley, Tody, Vestergaard   +38 more
core   +1 more source

Star formation and ISM morphology in tidally induced spiral structures [PDF]

, 2017
Tidal encounters are believed to be one of the key drivers of galactic spiral structure in the Universe. Such spirals are expected to produce different morphological and kinematic features compared to density wave and dynamic spiral arms. In this work we
Benincasa, Samantha M., Keller, Ben W., Pettitt, Alex R., Tasker, Elizabeth J., Wadsley, James W.   +4 more
core   +2 more sources

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

Dust Deficiency in the Interacting Galaxy NGC 3077

Galaxies, 2017
Using 70 μ m observations taken with the PACS instrument of the Herschel space telescope, the dust content of the nearby and interacting spiral galaxy NGC 3077 has been compared with the dust content of the isolated galaxies such as NGC 2841, NGC ...
Jairo Armijos-Abendaño, Ericson López, Mario Llerena, Franklin Aldás, Crispin Logan   +4 more
doaj   +1 more source

Mass extinction and the structure of the milky way [PDF]

Serbian Astronomical Journal, 2013
We use the most up-to-date Milky Way model and solar orbit data in order to test the hypothesis that the Sun's galactic spiral arm crossings cause mass extinction events on Earth. To do this, we created a new model of the Milky Way's spiral arms
Filipović M.D., Horner J., Crawford E.J., Tothill N.F.H., White G.L.   +4 more
doaj   +1 more source

Harnessing Bulk‐Segregant Mapping to Identify Trait‐Associated Genes in the Allopolyploid Model Plant Nicotiana benthamiana

Plant Biotechnology Journal, EarlyView.
ABSTRACT Forward genetics has been instrumental in identifying genes underlying desirable traits, yet its application to polyploid plants, many of which are key agricultural crops, remains challenging due to their genomic complexity. Therefore, we developed BenthMap, a bulk segregant analysis platform for high‐throughput trait mapping and gene ...
Zuba Ahmed, Jiyuan An, Satomi Hayashi, Julia Bally, Chris Winefield, Peter M. Waterhouse   +5 more
wiley   +1 more source

Probing isotopic ratios at z = 0.89: molecular line absorption in front of the quasar PKS 1830-211

, 2006
With the Plateau de Bure interferometer, we have measured the C, N, O and S isotopic abundance ratios in the arm of a spiral galaxy with a redshift of 0.89. The galaxy is seen face-on according to HST images. Its bulge intercepts the line of sight to the
Anders, Bensch, Cernicharo, Chengalur, Chin, Chin, Combes, Combes, Combes, F. Combes, Frerking, Frye, Guélin, Gérin, Harrison, Heikkilä, Henkel, Henkel, Henkel, Hirota, Jauncey, Kahane, Kahane, Koopmans, Landré, Langer, Lidman, Lovell, Lovell, Lucas, Lucas, Lucas, M. Dumke, M. Guélin, Martín, Martín, Menten, Menten, Milam, Minh, Minh, Muller, Nair, Penzias, Penzias, Polehampton, Prantzos, R. Lucas, Roberts, S. Muller, Sage, Shah, Spergel, Subrahmanyan, Swift, van Ommen, Wang, Wiklind, Wiklind, Wiklind, Wiklind, Wilson, Wilson, Winn, Wouterloot   +64 more
core   +4 more sources

Spaceborne and spaceborn: Physiological aspects of pregnancy and birth during interplanetary flight

Experimental Physiology, EarlyView.
Abstract Crewed interplanetary return missions that are on the planning horizon will take years, more than enough time for initiation and completion of a pregnancy. Pregnancy is viewed as a sequence of processes – fertilization, blastocyst formation, implantation, gastrulation, placentation, organogenesis, gross morphogenesis, birth and neonatal ...
Arun V. Holden
wiley   +1 more source

Galaxy Zoo:dust in spiral galaxies

, 2011
We investigate the effect of dust on spiral galaxies by measuring the inclination dependence of optical colours for 24 276 well-resolved Sloan Digital Sky Survey (SDSS) galaxies visually classified via the Galaxy Zoo project. We find clear trends of reddening with inclination which imply a total extinction from face-on to edge-on of 0.7, 0.6, 0.5 and 0.
Masters, Karen L., Nichol, Robert, Bamford, Steven P., Mosleh, Moein, Lintott, Chris J., Andreescu, Dan, Edmondson, Edward M., Keel, William C., Murray, Phil, Raddick, M. Jordan, Schawinski, Kevin, Slosar, Anze, Szalay, Alexander S., Thomas, Daniel Georg, Vandenberg, Jan   +14 more
openaire   +3 more sources