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A SALT spectral study of S0s hosting pseudobulges

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dc.contributor.author Vaghmare, K
dc.contributor.author Barway, Sudhanshu
dc.contributor.author Vaisanen, Petri
dc.contributor.author Ramphul, Rajin
dc.contributor.author Wadadekar, Yogesh
dc.contributor.author Kembhavi, Ajit K
dc.date.accessioned 2020-11-14T07:23:27Z
dc.date.available 2020-11-14T07:23:27Z
dc.date.issued 2018-11
dc.identifier.citation Monthly Notices of the Royal Astronomical Society, Vol. 480, No. 4, pp. 4931-4947 en_US
dc.identifier.issn 1365-2966
dc.identifier.uri http://prints.iiap.res.in/handle/2248/7004
dc.description Restricted Access © Royal Astronomical Society https://doi.org/10.1093/mnras/sty2217 en_US
dc.description.abstract We present a SALT-RSS spectroscopic study of a sample of S0 galaxies established by Vaghmare et al. (2015) as having pseudobulges using a combination of photometric criteria. We extract the spectra of various regions along the galaxy major axis using standard long-slit spectroscopic reduction procedures and model the spectra using STARLIGHT to derive detailed star-formation histories. The central spectra of galaxies without bars in our sample reveal a complex star-formation history, which is consistent with the belief that pseudobulges have a history of star formation distributed over extended periods of time. The spectra of the unbarred galaxies contain strong emission lines such as H α, indicating active star formation, which appears to be in contradiction with the expectation that S0 galaxies have been stripped of gas. In the case of the two barred galaxies in the sample, the spectrum is dominated by light from a much older stellar population. This seems to suggest an accelerated formation of the pseudobulge made possible by the action of the bar. One of these galaxies appears to have exhausted its reservoir of gas and thus has no signature of a recently formed population of stars while the other galaxy has managed to give rise to new stars through a recent funnelling action. We have also confirmed the influence of bars on the nature of the stellar population in a pseudobulge using an alternate sample based on the SDSS. en_US
dc.language.iso en en_US
dc.publisher Oxford University Press on behalf of the Royal Astronomical Society en_US
dc.subject Galaxies: bulges en_US
dc.subject Galaxy: formation en_US
dc.subject Galaxies: fundamental parameters en_US
dc.subject Galaxies: photometry en_US
dc.subject Galaxies: spiral en_US
dc.subject Galaxies: structure en_US
dc.title A SALT spectral study of S0s hosting pseudobulges en_US
dc.type Article en_US


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