Browsing by Author "Lyubenova, M."

Now showing 1 - 7 of 7
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    Abundance ratios and IMF slopes in the dwarf elliptical galaxy NGC 1396 with MUSE
    (2016) Mentz, J. J.; La Barbera, F.; Peletier, R. F.; Falcon-Barroso, J.; Lisker, T.; van de Ven, G.; Loubser, S. I.; Hilker, M.; Sanchez-Janssen, R.; Napolitano, N.; Cantiello, M.; Capaccioli, M.; Norris, M.; Paolillo, M.; Smith, R.; Beasley, M. A.; Lyubenova, M.; Munoz, R.; Puzia, T.
    Deep observations of the dwarf elliptical (dE) galaxy NGC 1396 (M-V = -16.60, Mass similar to 4 x 10(8) M-circle dot), located in the Fornax cluster, have been performed with the Very Large Telescope/Multi Unit Spectroscopic Explorer spectrograph in the wavelength region from 4750 to 9350 angstrom. In this paper, we present a stellar population analysis studying chemical abundances, the star formation history (SFH) and the stellar initial mass function (IMF) as a function of galactocentric distance. Different, independent ways to analyse the stellar populations result in a luminosity-weighted age of similar to 6 Gyr and a metallicity [Fe/H]similar to -0.4, similar to other dEs of similar mass. We find unusually overabundant values of [Ca/Fe]similar to+0.1, and underabundant Sodium, with [Na/Fe] values around -0.1, while [Mg/Fe] is overabundant at all radii, increasing from similar to+0.1 in the centre to similar to+0.2 dex. We notice a significant metallicity and age gradient within this dwarf galaxy. To constrain the stellar IMF of NGC 1396, we find that the IMF of NGC 1396 is consistent with either a Kroupa-like or a top-heavy distribution, while a bottom-heavy IMF is firmly ruled out. An analysis of the abundance ratios, and a comparison with galaxies in the Local Group, shows that the chemical enrichment history of NGC 1396 is similar to the Galactic disc, with an extended SFH. This would be the case if the galaxy originated from a Large Magellanic Cloud-sized dwarf galaxy progenitor, which would lose its gas while falling into the Fornax cluster.
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    Carbon stars in the X-Shooter Spectral Library
    (2016) Gonneau, A.; Lançon, A.; Trager, S.; Aringer, B.; Lyubenova, M.; Nowotny, W.; Peletier, R.; Prugniel, P.; Chen, Y.; Sánchez Blazquez, Patricia; Choudhury, O.; Falcón Barroso, J.; Koleva, M.; Meneses Goytia, S.; Dries, M.; Vazdekis, A.
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    Fornax3D project: Assembly history of massive early-type galaxies in the Fornax cluster from deep imaging and integral field spectroscopy
    (2022) Spavone, M.; Iodice, E.; D'Ago, G.; van de Ven, G.; Morelli, L.; Corsini, E. M.; Sarzi, M.; Coccato, L.; Fahrion, K.; Falcon-Barroso, J.; Gadotti, D. A.; Lyubenova, M.; Martin-Navarro, I.; McDermid, R. M.; Pinna, F.; Pizzella, A.; Poci, A.; de Zeeuw, P. T.; Zhu, L.
    This work is based on high-quality integral-field spectroscopic data obtained with the Multi Unit Spectroscopic Explorer (MUSE) on the Very Large Telescope (VLT). The 21 brightest (m(B) <= 15 mag) early-type galaxies (ETGs) inside the virial radius of the Fornax cluster are observed out to distances of similar to 2-3 R-e. Deep imaging from the VLT Survey Telescope (VST) is also available for the sample ETGs. We investigated the variation of the galaxy structural properties as a function of the total stellar mass and cluster environment. Moreover, we correlated the size scales of the luminous components derived from a multi-component decomposition of the VST surface-brightness radial profiles of the sample ETGs with the MUSE radial profiles of stellar kinematic and population properties. The results are compared with both theoretical predictions and previous observational studies and used to address the assembly history of the massive ETGs of the Fornax cluster. We find that galaxies in the core and north-south clump of the cluster, which have the highest accreted mass fraction, show milder metallicity gradients in their outskirts than the galaxies infalling into the cluster. We also find a segregation in both age and metallicity between the galaxies belonging to the core and north-south clump and the infalling galaxies. The new findings fit well within the general framework for the assembly history of the Fornax cluster.
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    IMF. shape constraints from stellar populations and dynamics from CALIFA
    (2016) Lyubenova, M.; Martın-Navarro, I.; van de Ven, G.; Falcon-Barroso, J.; Galbany, A.; Gallazzi, L.; Garcıa-Benito, R.; Gonzalez Delgado, R.; Husemann, B.; Sánchez Blazquez, Patricia; Marino, R. A.; Mast, D.; Mendez-Abreu, J.; Peletier, R. F. P.; La Barbera, F.; Sanchez, S. F.; Trager, S. C.; van den Bosch, R. C. E.; Vazdekis, A.; Walcher, C. J.; Zhu, L.; Zibetti, S.; Ziegler, B.; Bland-Hawthorn, J.
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    Observational constraints to boxy/peanut bulge formation time
    (2017) Sánchez Blazquez, Patricia; Perez, I.; Martínez-Valpuesta, I.; Ruiz-Lara, T.; De Lorenzo-Caceres, A.; Falcon-Barroso, J.; Florido, E.; Delgado, R. M. G.; Lyubenova, M.; Marino, R. A.; Sánchez, S. F.; Van De Ven, G.; Zurita, A.
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    Stellar kinematics across the Hubble sequence in the CALIFA survey: general properties and aperture corrections
    (2017) Falcón Barroso, J.; Lyubenova, M.; Van De Ven, G.; Mendez Abreu, J.; Aguerri, J. A. L.; Garcia Lorenzo, B.; Bekeraite, S.; Sanchez, S. F.; Husemann, B.; Sánchez Blazquez, Patricia
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    The panchromatic high-resolution spectroscopic survey of local group star clusters: I. general data reduction procedures for the VLT/X-shooter UVB and VIS arm
    (2014) Schonebeck, F.; Puzia, Thomas H.; Pasquali, A.; Grebel, E.; Kissler Patig, M.; Kuntschner, H.; Lyubenova, M.; Perina Pala, Sibilla