Primordial (pseudo)bulges in isolated galaxies

M. Fernández Lorenzo, J. Sulentic, L. Verdes-Montenegro, J. Blasco-Herrera, MARIA DEL CARMEN ARGUDO FERNANDEZ, P. Ramírez-Moreta, J. Garrido, J. E. Ruiz, S. Sánchez-Expósito, J. D. Santander-Vela

Research output: Contribution to conferencePaperpeer-review

Abstract

Important clues about spiral galaxy formation lie in the nature of their central bulges. In this sense, properties of bulges in isolated galaxies best reflect their origin because of their minimized environmental evolutionary effects. We report here the structural parameters and (g − i) bulge/disk colors for a sample of 189 isolated galaxies selected from the AMIGA project (Analysis of the interstellar Medium of Isolated GAlaxies). A 2D bulge/disk/bar decomposition of SDSS i-band images was performed in order to identify the pseudobulges in our sample. We derived (g − i) bulge colors using aperture photometry. Pseudobulges in our sample show median colors (g − i) ∼ 1.06, while their associated disks are much bluer, (g − i) ∼ 0.77. Moreover, 64 % (113/177) of pseudobulges follow the red sequence of early-type galaxies. The bluer pseudobulges in our sample tend to be located in those galaxies more affected by the tidal interactions. The red bulge colors and low B/T values for AMIGA isolated galaxies are consistent with an early formation epoch. The results found here suggest that environment could be playing a role in rejuvenating the pseudobulges.

Original languageEnglish
Pages195-200
Number of pages6
StatePublished - 9 Jul 2014
Externally publishedYes
Event11th Scientific Meeting of the Spanish Astronomical Society - Highlights of Spanish Astrophysics VIII, SEA 2014 - Teruel, Spain
Duration: 8 Sep 201412 Sep 2014

Conference

Conference11th Scientific Meeting of the Spanish Astronomical Society - Highlights of Spanish Astrophysics VIII, SEA 2014
CountrySpain
CityTeruel
Period8/09/1412/09/14

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