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The long-lived inner bar of NGC 1291

Published online by Cambridge University Press:  14 May 2020

Jairo Méndez-Abreu Open the ORCID record for Jairo Méndez-Abreu [Opens in a new window] ,
Adriana de Lorenzo-Cáceres  and
the TIMER team
Jairo Méndez-Abreu
Affiliation:
Instituto de Astrofísica de Canarias, C/ Vía Láctea s/n, E-38205 La Laguna, Tenerife, Spain Departamento de Astrofísica, Universidad de La Laguna, E-38200 La Laguna, Tenerife, Spain email: [email protected]
Adriana de Lorenzo-Cáceres
Affiliation:
Instituto de Astrofísica de Canarias, C/ Vía Láctea s/n, E-38205 La Laguna, Tenerife, Spain Departamento de Astrofísica, Universidad de La Laguna, E-38200 La Laguna, Tenerife, Spain email: [email protected]
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Abstract

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The question whether stellar bars are either transitory features or long-lived structures is still matter of debate. This problem is more acute for double-barred systems where even the formation of the inner bar remains a challenge for numerical studies. We present a thorough study of the central structures of the double-barred galaxy NGC 1291. We used a two-dimensional multi-component photometric decomposition performed on the 3.6 μm images from S4 G, combined with both stellar kinematics and stellar population analysis carried out using integral field data from the MUSE TIMER project. We report on the discovery of the first Box-Peanut (B/P) structure in an inner bar detected in the face-on galaxy NGC 1291. The B/P structure is detected as bi-symmetric minima of the h4 moment of the line-of-sight velocity distribution along the major axis of the inner bar, as expected from numerical simulations. Our observations demonstrate that inner bars (similarly as outer bars) can suffer buckling instabilities, thus suggesting they can survive a long time after bar formation. The analysis of the star formation history for the structural components shaping the central regions of NGC 1291 also constrains the epoch of dynamical assembly of the inner bar, which took place >6.5 Gyr ago for NGC 1291. Our results imply that the inner bar of NGC 1291 is a long-lived structure.

Keywords

galaxies: individual: NGC 1291galaxies: structuregalaxies: kinematics and dynamicsgalaxies: evolutiontechniques: spectroscopic
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S353: Galactic Dynamics in the Era of Large Surveys , June 2019 , pp. 168 - 171
Copyright
© International Astronomical Union 2020

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