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Gas inflow and nuclear star formation in galaxies with non-axisymmetric bulges

Published online by Cambridge University Press:  22 May 2014

E. Kim ,
S. S. Kim ,
G.-H. Lee ,
M. G. Lee  and
R. de Grijs
E. Kim
Affiliation:
School of Space Research, Kyung Hee University, Yongin, Gyeonggi 446-701, Korea email: [email protected]
S. S. Kim
Affiliation:
School of Space Research, Kyung Hee University, Yongin, Gyeonggi 446-701, Korea email: [email protected] Department of Astronomy & Space Science, Kyung Hee University, Gyeonggi 446-701, Korea
G.-H. Lee
Affiliation:
Department of Physics and Astronomy, Seoul National University, Gwanak-gu, Seoul 151-742, Korea
M. G. Lee
Affiliation:
Department of Physics and Astronomy, Seoul National University, Gwanak-gu, Seoul 151-742, Korea
R. de Grijs
Affiliation:
Kavli Institute for Astronomy & Astrophysics and Department of Astronomy, Peking University, Yi He Yuan Lu 5, Hai Dian District, Beijing 100871, China
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Abstract

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We present the dependence of the amount of nuclear star formation on the non-axisymmetry of a bulge of disk galaxies. For this, we use a volume-limited sample of spiral galaxies at 0.02 < = z < 0.055 from the SDSS DR7. Among 3173 final sample galaxies with an axis ratio b/a > 0.6 and a bulge fraction ranged in B/T <= 0.41, nuclear starburst galaxies are 10%. We find that a fraction of the nuclear starburst galaxies become higher when ellipticity of a bulge increases in early type galaxies. Also, the fraction increases clearly when early type galaxies are isolated and in low density region. Our results indicate that the non-axisymmetry of bulges assists gas to fall inside and affects the nuclear starburst process in disk galaxies.

Keywords

Galaxies:sprial — Galaxy:bulge — Galaxies: starburst
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S303: The Galactic Center: Feeding and Feedback in a Normal Galactic Nucleus , October 2013 , pp. 171 - 173
Copyright
Copyright © International Astronomical Union 2014 

References

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