observational constraints to boxy/peanut bulge formation...
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Observational constraints to boxy/peanut bulge formation time
Isabel Pérez Departamento Física Teórica y del Cosmos, Universidad de Granada
I. Martinez-Valpuesta(IAC), T. Ruiz-Lara(IAC), A. de Lorenzo-Caceres(IAC)), J. Falcón-Barroso (IAC), Estrella Florido (UGR),R.M. Gonzalez-Delgado (IAA), M. Lyubenova (RUG), R.A. Marino (ETH), S.F. Sanchez (UAM), P. Sánchez-Bláquez (U. autóma de Madrid), G. van de Ven (MPI), A. Zurita (UGR)
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Observations trace a boxy/peanut structure in the MW
Valenti, et al. (2016)
based on RC stars from VVV
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Boxy/peanut are ubiquitous
Martinez-Valpuesta et al. 2006
Boxy/peanut shape bulges in more than 40% of disc galaxies (Lutticke et al . 2000).
Simulations show that boxy peanut bulges are bars (Combes & Sanders 1981; Athanassoula et al. 2002, Debattista et al. 2006, etc)
Observational evidence from spectroscopy of edge-on galaxies (e.g. Kuijken & Merrifield 1995; Bureau & Freeman 1999; Chung & Bureau 2004)
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How do B/P bulges look like in less inclined galaxies?
Boxy/peanut shape bulges related to bar/lense structures seen face-on (Debattista et al. 2013, Laurikainen et al. 2017, 2014, Athanassoula et al 2015)
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When and how bars and boxy/peanut bulges form?
- resolved star formation histories (near-field cosmology)
CALIFA survey PMAS (Ppak configuration) 3400-7300 ÅFinal spectral resolution FWHM ~ 6 Å and spatial resolutiion 1”
Subsample of 20 barred spirals beloging to size outliers such as NGC6032
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When and how bars and boxy/peanut bulges form?
- star formation histories: Integrated spectra from elliptical annuli bins
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Stellar content analysis different approaches:● Colours
● Line indices
● Full spectral fitting
Sanchez-Blazquez et al. 2011
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``STEllar Content and Kinematics via Maximum A Posteriori likelihood''STECKMAP (Ocvirk 2006)
Stellar Population models: MILES (Vazdekis et al. 2010: http://miles.iac.es)
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Comparison between CMD and integrated stellar populations: LMC
Ruiz-Lara, Pérez, Gallart et al. 2015
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Comparison between CMD and integrated stellar populations: LMC
WFPC2, reaching the oldest MS turn-offAparicio & Gallart 2004
EFOSC2 Ruiz-Lara et al. 2015
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Comparison between CMD and integrated stellar populations: LMC
Good agreement between state-of-the-art resolved stellar analysis and full spectral fitting (Ruiz-Lara, Pérez et al 2015)
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When and how bars and boxy/peanut bulges form from star formation histories
Integrated spectra from elliptical annuli bins
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Snapshot of bar and bulge formation from the SFH of NGC6032
Pérez, Martinez-Valpuesta et al. 2017.
Pérez, Martinez-Valpuesta et al. 2017.
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Snapshot of bar and bulge formation from the SFH of NGC6032
Pérez, Martinez-Valpuesta et al. 2017.
Pérez, Martinez-Valpuesta et al. 2017.
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Quenching of the SF in the 'inner' bar: bar as a conveyor belt
Pérez, Martinez-Valpuesta et al. 2017.
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Bar grows from disc material
Pérez, Martinez-Valpuesta et al. 2017.
Pérez, Martinez-Valpuesta et al. 2017.
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Snapshot of bar and bulge formation from numerical simulations: bar formation and buckling period
Pérez, Martinez-Valpuesta et al. 2017.
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Summary
● The close relation between morphological features and SFHs suggest a long-lasting bar
● The enhancement of star formation in the inner bar suggests, based on the new simulation a relation with the bar formation and main growth, right before the buckling event. In this way we can estimate the buckling occurring around 8 Gyrs ago. We can also infer the formation of the stable disc and the bar at least before 10 Gyrs.
● After the event of the B/P formation, the bar grows again mainly from disc material
● When the bar forms there is a quenching in the star formation of the inner bar, suggesting that the bar can act as a conveyor belt, transferring material to the centre from the disc without forming stars within it.
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● Sanchez-Menguiano, Sanchez, Perez et al 2017 accepted (Today!)● 102 spiral galaxies with MUSE (part of the AMUSING project) 2D distributions Gas
abundances, stellar properties, kinematics, physical properties of HII regions