The nature of arms in spiral galaxies. I - Azimuthal colour profiles of NGC 7479 and NGC 1832

Bibcode
1990A&A...229...37B
Beckman, J. E.; Cepa, J.
Bibliographical reference

Astronomy and Astrophysics (ISSN 0004-6361), vol. 229, no. 1, March 1990, p. 37-46.

Advertised on:
3
1990
Number of authors
2
IAC number of authors
1
Citations
26
Refereed citations
24
Description
A set of parameters to characterize azimuthal profiles of galaxies is proposed and applied to the spiral structure of the galaxies NGC 1832 and NGC 7479 observed in the B and I passbands. Interpretations of the observations in terms of the two most widely discussed theories of star formation, the spiral density wave theory and that of self-stochastic propagation of star formation, are considered. NGC 7479, with well defined arms, seems to maintain a leading density wave; evidence is presented for a phase separation in the B and I bands corresponding to star formation stimulated by the passage of the wave. NGC 1832, with more flocculent spiral arms, presents a more confused interpretational pattern.
Type
Refereed
Density wave model
Spiral galaxies
Star formation

It may interest you

  • Refereed
    Calibrating the Clock of JWST
    JWST, despite not being designed to observe astrophysical phenomena that vary on rapid timescales, can be an unparalleled tool for such studies. If timing systematics can be controlled, JWST will be able to open up the subsecond infrared timescale regime. Rapid time-domain studies, such as lag measurements in accreting compact objects and solar
    Dhillon, V. S. et al.

    Advertised on:

    1
    2025
    Bibcode
    2025AJ....169...21S
    Citations
    0
  • Refereed
    Comparing metallicity correlations in nearby non-AGN and AGN-host galaxies
    The gas-phase metallicity distribution within galaxies records critical information about galactic evolution. In this work, we investigate how active galactic nuclei (AGNs) influence this distribution by measuring the two-point correlation functions of gas-phase metallicity in 95 non-AGN and 37 AGN-host galaxies from the Calar Alto Legacy Integral
    Li, Song-Lin et al.

    Advertised on:

    1
    2025
    Bibcode
    2025MNRAS.536..430L
    Citations
    1
  • Refereed
    Multiband Optical Variability of the Blazar 3C 454.3 on Diverse Timescales
    Due to its peculiar and highly variable nature, the blazar 3C 454.3 has been extensively monitored by the WEBT team. Here, we present for the first time these long-term optical flux and color variability results using data acquired in B, V, R, and I bands over a time span of about two decades. We include data from WEBT collaborators and public
    Dogra, Karan et al.

    Advertised on:

    1
    2025
    Bibcode
    2025ApJS..276....1D
    Citations
    0