Effects of spiral arms on star formation in nuclear rings of barred-spiral galaxies

Seo, Woo-Young; Kim, Woong-Tae

doi:10.1088/0004-637X/792/1/47

Title: Effects of spiral arms on star formation in nuclear rings of barred-spiral galaxies

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Abstract

We use hydrodynamic simulations to study the effect of spiral arms on the star formation rate (SFR) in nuclear rings of barred-spiral galaxies. We find that spiral arms can be an efficient means of gas transport from the outskirts to the central parts, provided that the arms are rotating slower than the bar. While the ring star formation in models with no arms or corotating arms is active only during around the bar growth phase, arm-driven gas accretion both significantly enhances and prolongs the ring star formation in models with slow-rotating arms. The arm-enhanced SFR is larger by a factor of ∼3-20 than in the no-arm model, with larger values corresponding to stronger and slower arms. Arm-induced mass inflows also make dust lanes stronger. Nuclear rings in slow-arm models are ∼45% larger than in the no-arm counterparts. Star clusters that form in a nuclear ring exhibit an age gradient in the azimuthal direction only when the SFR is small, whereas no notable age gradient is found in the radial direction for models with arm-induced star formation.

Authors:

Seo, Woo-Young; Kim, Woong-Tae ^[1]

Center for the Exploration of the Origin of the Universe (CEOU), Astronomy Program, Department of Physics and Astronomy, Seoul National University, Seoul 151-742 (Korea, Republic of)

Publication Date:: Mon Sep 01 00:00:00 EDT 2014

OSTI Identifier:: 22365210

Resource Type:: Journal Article

Journal Name:: Astrophysical Journal

Additional Journal Information:: Journal Volume: 792; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X

Country of Publication:: United States

Language:: English

Subject:: 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DATA; DUSTS; GALAXIES; GALAXY NUCLEI; MASS; RINGS; SIMULATION; STAR CLUSTERS; STAR EVOLUTION; STARS

Citation Formats


                    Seo, Woo-Young, and Kim, Woong-Tae. Effects of spiral arms on star formation in nuclear rings of barred-spiral galaxies.  United States: N. p., 2014. 
        Web.  doi:10.1088/0004-637X/792/1/47.

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                    Seo, Woo-Young, & Kim, Woong-Tae. Effects of spiral arms on star formation in nuclear rings of barred-spiral galaxies.  United States.  https://doi.org/10.1088/0004-637X/792/1/47

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                    Seo, Woo-Young, and Kim, Woong-Tae. 2014.  
        "Effects of spiral arms on star formation in nuclear rings of barred-spiral galaxies".  United States.  https://doi.org/10.1088/0004-637X/792/1/47.

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@article{osti_22365210,

  title        = {Effects of spiral arms on star formation in nuclear rings of barred-spiral galaxies},

  author       = {Seo, Woo-Young and Kim, Woong-Tae},

  abstractNote = {We use hydrodynamic simulations to study the effect of spiral arms on the star formation rate (SFR) in nuclear rings of barred-spiral galaxies. We find that spiral arms can be an efficient means of gas transport from the outskirts to the central parts, provided that the arms are rotating slower than the bar. While the ring star formation in models with no arms or corotating arms is active only during around the bar growth phase, arm-driven gas accretion both significantly enhances and prolongs the ring star formation in models with slow-rotating arms. The arm-enhanced SFR is larger by a factor of ∼3-20 than in the no-arm model, with larger values corresponding to stronger and slower arms. Arm-induced mass inflows also make dust lanes stronger. Nuclear rings in slow-arm models are ∼45% larger than in the no-arm counterparts. Star clusters that form in a nuclear ring exhibit an age gradient in the azimuthal direction only when the SFR is small, whereas no notable age gradient is found in the radial direction for models with arm-induced star formation.},

  doi          = {10.1088/0004-637X/792/1/47},

  url          = {https://www.osti.gov/biblio/22365210},
  journal      = {Astrophysical Journal},

  issn         = {0004-637X},

  number       = 1,

  volume       = 792,

  place        = {United States},

  year         = {Mon Sep 01 00:00:00 EDT 2014},

  month        = {Mon Sep 01 00:00:00 EDT 2014}

}

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