English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We investigate photometric properties of spiral arms and stellarcomplexes/associations inside these arms in the grand design NGC 628 (M74)galaxy.We analyze GALEX ultraviolet, optical UBVRI, and H-alpha? surfacephotometry data, including those obtained with 1.5 m telescope at the MaidanakObservatory. In the longer arm, the large and bright stellar complexes arelocated at regular intervals along the arm, but only farther from the galaxycenter. They are joined with the narrow lane of dust, visible only in theinfrared bands. The usual dust lane along the stellar arm inner side is seenthere only at distances closer to the galaxy center. It is well expressed in CO(H_2) image. We have found, that the second, short arm hosts two dust lanes,the strong and wide at the inner side, and narrow and irregular along its outeredge. This outer dust lane is well seen in IR images only. The shorter armcontains no star complexes at all. Gradients of age and luminosity of starsacross both arms are missing (again excepting the parts of arms located closerto the center), which is confirmed by our photometric cuts across both arms.The drastic difference in the morphology of the two symmetric arms (granddesign type) of a galaxy has now been confirmed by objective measurements inthe case of M74. It is unclear why about two third of galaxies with beaded armshost these "beads" (star complexes) in one arm only.

Regular chains of star formation complexes in spiral arms of NGC 628