The star-forming histories of the nucleus, bulge, and inner disk of NGC 5102: Clues to the evolution of a nearby lenticular galaxy

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DOIResolve DOI: http://doi.org/10.1088/0004-637X/799/1/97
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TypeArticle
Journal titleThe Astrophysical Journal
ISSN0004-637X
Volume799
Issue1
AbstractLong slit spectra recorded with the Gemini Multi-Object Spectrograph on Gemini South are used to examine the star-forming history (SFH) of the lenticular galaxy NGC 5102. Structural and supplemental photometric information are obtained from archival Spitzer [3.6] images. Absorption features at blue and visible wavelengths are traced out along theminor axis to galactocentric radii ∼ 60 arcsec (∼0.9 kpc), sampling the nucleus, bulge, and disk components. Comparisons with model spectra point to luminosity-weighted metallicities that are consistent with the colors of resolved red giant branch stars in the disk. The nucleus has a luminosity-weighted age at visiblewavelengths of ∼1-0.1 +0.2 Gyr, and the integrated light is dominated by stars that formed over a time period of only a few hundred Myr. For comparison, the luminosity-weighted ages of the bulge and disk are ∼2-0.2 +0.5 Gyr and 10-2 +2 Gyr, respectively. The g′ - [3.6] colors of the nucleus and bulge are consistent with the spectroscopically based ages. In contrast to the nucleus, models that assume star-forming activity spanning many Gyr provide a better match to the spectra of the bulge and disk than simple stellar population models. Isophotes in the bulge have a disky shape, hinting that the bulge was assembled from material with significant rotational support. The SFHs of the bulge and disk are consistent with the bulge forming from the collapse of a long-lived bar, rather than from the collapse of a transient structure that formed as the result of a tidal interaction. It is thus suggested that the progenitor of NGC 5102 was a barred disk galaxy that morphed into a lenticular galaxy through the buckling of its bar.
Publication date
PublisherIOP Publishing
LanguageEnglish
AffiliationNational Research Council Canada; National Science Infrastructure
Peer reviewedYes
NPARC number21275808
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Record identifier09624a2d-8588-4974-8870-2980325f7d86
Record created2015-07-14
Record modified2016-07-18
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