Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21941705c&link_type=abstract
American Astronomical Society, AAS Meeting #219, #417.05
Astronomy and Astrophysics
Astronomy
Scientific paper
We have carried out two different studies by combining ultra-violet (UV) data from NASA's GALEX satellite and infrared data from the Spitzer Survey of Stellar Structure in Galaxies (S4G).
Quantifying the evolution of the bar fraction across the cosmic time can shed light on the process of disk assembly. However, studies of the bar fraction at high redshift are hampered by the fact that optical observations probe the UV rest frame regime, where bars tend to be much less prominent as a consequence of the Balmer Break. In order to quantify this bias, we have studied the bar frequency in the UV for the S4G sample, using GALEX data. Our results yield a UV bar fraction between 0.09-0.19 for the S4G sample, where the larger figure is an upper limit that includes candidate bars. This is quite low as compared to 0.65, which is the typical value found in optical and near-infrared studies (NIR). As a second part of this work, we will discuss the scenarios of disks formation. The addition of UV data provided by NASA's GALEX satellite, allows us to derive (1) the spatially-resolved star formation rate and (2) the attenuation of the stellar light by interstellar dust.
Comparing the radial distribution of young stars to the total of stellar mass is a crucial test to prove the scenarios for disk evolution, especially the inside-out scenario and possible deviations from it due to accreting satellites, stellar migration or interaction with the environment. In this work, we have compiled the images at the near ultra-violet (NUV) and far ultra-violet (FUV) for the whole sample and have obtained surface brightness and color profiles, as well as their UV fluxes in order to compare them to the parameters that have been derived from the IR bands of the Warm Spitzer mission.
Chicharro-Fuertes Raquel
Gil de Paz Amando
Munoz-Mateos J.
Sheth Kartik
Spitzer Survey of Stellar Structure in Galaxies S4G Team
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