Constraining the ages of the fireballs in the wake of the dIrr galaxy VCC1217 - IC3418 - Astrophysics > Cosmology and Nongalactic AstrophysicsReport as inadecuate




Constraining the ages of the fireballs in the wake of the dIrr galaxy VCC1217 - IC3418 - Astrophysics > Cosmology and Nongalactic Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: A complex of Halpha emitting blobs with strong FUV excess is associated tothe dIrr galaxy VCC1217 - IC3418 Hester et al. 2010, and extends up to 17 Kpcin the South-East direction. These outstanding features can be morphologicallydivided into diffuse filaments and compact knots, where most of the starformation activity traced by Halpha takes place. We investigate the propertiesof the galaxy and the blobs using a multiwavelength approach in order toconstrain their origin. We collect publicly available data in UV and Halpha andobserve the scene in the optical U,g,r,i bands with LBT. The photometric dataallows to evaluate the star formation rate and to perform a SED fittingseparately of the galaxy and the blobs in order to constrain their stellarpopulation age. Moreover we analyze the color and luminosity profile of thegalaxy and its spectrum to investigate its recent interaction with the Virgocluster. Our analysis confirms that the most plausible mechanism for theformation of the blobs is ram pressure stripping by the Virgo cluster IGM. Thegalaxy colors, luminosity profile and SED are consistent with a sudden gasdepletion in the last few hundred Myr. The SED fitting of the blobs constrainstheir ages in < 400 Myr.



Author: Mattia Fumagalli, Giuseppe Gavazzi, Roberto Scaramella, Paolo Franzetti

Source: https://arxiv.org/







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