Grand design and flocculent spirals in the spitzer survey of stellar structure in galaxies (S4G)

Debra Meloy Elmegreen, Bruce G. Elmegreen, Andrew Yau, E. Athanassoula, Albert Bosma, Ronald J. Buta, George Helou, Luis C. Ho, Dimitri A. Gadotti, Johan H. Knapen, Eija Laurikainen, Barry F. Madore, Karen L. Masters, Sharon E. Meidt, Karín Menéndez-Delmestre, Michael W. Regan, Heikki Salo, Kartik Sheth, Dennis Zaritsky, Manuel AravenaRamin Skibba, Joannah L. Hinz, Jarkko Laine, Armando Gil De Paz, Juan Carlos Mũoz-Mateos, Mark Seibert, Trisha Mizusawa, Taehyun Kim, Santiago Erroz Ferrer

Research output: Contribution to journalArticle

50 Scopus citations

Abstract

Spiral arm properties of 46 galaxies in the Spitzer Survey of Stellar Structure in Galaxies (S4G) were measured at 3.6 μm, where extinction is small and the old stars dominate. The sample includes flocculent, multiple arm, and grand design types with a wide range of Hubble and bar types. We find that most optically flocculent galaxies are also flocculent in the mid-IR because of star formation uncorrelated with stellar density waves, whereas multiple arm and grand design galaxies have underlying stellar waves. Arm-interarm contrasts increase from flocculent to multiple arm to grand design galaxies and with later Hubble types. Structure can be traced further out in the disk than in previous surveys. Some spirals peak at mid-radius while others continuously rise or fall, depending on Hubble and bar type. We find evidence for regular and symmetric modulations of the arm strength in NGC4321. Bars tend to be long, high amplitude, and flat-profiled in early-type spirals, with arm contrasts that decrease with radius beyond the end of the bar, and they tend to be short, low amplitude, and exponential-profiled in late Hubble types, with arm contrasts that are constant or increase with radius. Longer bars tend to have larger amplitudes and stronger arms.

Original languageEnglish (US)
Article number32
JournalAstrophysical Journal
Volume737
Issue number1
DOIs
StatePublished - Aug 10 2011

Keywords

  • galaxies: photometry
  • galaxies: spiral
  • galaxies: structure
  • infrared: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'Grand design and flocculent spirals in the spitzer survey of stellar structure in galaxies (S<sup>4</sup>G)'. Together they form a unique fingerprint.

  • Cite this

    Elmegreen, D. M., Elmegreen, B. G., Yau, A., Athanassoula, E., Bosma, A., Buta, R. J., Helou, G., Ho, L. C., Gadotti, D. A., Knapen, J. H., Laurikainen, E., Madore, B. F., Masters, K. L., Meidt, S. E., Menéndez-Delmestre, K., Regan, M. W., Salo, H., Sheth, K., Zaritsky, D., ... Erroz Ferrer, S. (2011). Grand design and flocculent spirals in the spitzer survey of stellar structure in galaxies (S4G). Astrophysical Journal, 737(1), [32]. https://doi.org/10.1088/0004-637X/737/1/32