Title: “Formación estelar en el UV en discos de galaxias de la exploración S⁴G: estrangulamiento y emisión UV extensa“
English title: “UV tracing of the recent star formation activity in galaxy disks within the S⁴G survey : from strangulation to XUV emission“
NASA/ADS: https://ui.adsabs.harvard.edu/abs/2018PhDT…….253B/abstract
E-print version available through the thesis repository of the Universidad Complutense de Madrid: https://eprints.ucm.es/51235/
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Abstract: The S4G is a volume-,magnitude, and size-limited sample of nearby galaxies of all morphological types within a volume of 40Mpc, attaining a depth in 3.6 μm surface brightness μ[3.6]=26.5 magarcsec−2 which corresponds to be probing stellar mass surface densities of much less than 1 solarmass per square parsec (Sheth et al., 2010). We start out with the S4G as our base sample, with 2352 galaxies for which we have spatially resolved photometry in the 3.6 and 4.5 μm bands (Muñoz-Mateos et al., 2015). We then collect, reduce, and perform careful photometry on publicly available GALEX FUV and NUV images. In the end, our GALEX/S4G sample comprises 1931 galaxies with both FUV and NUV photometry, homogenized to the 3.6 and 4.5 μmphotometry. This corresponds to 82% coverage of the S4G sample, meaning that global statistics obtained on our subsample are similar to those of the S4G sample, and consequently, should be fairly representative of the Local Universe as well. The missing 18% are either due to vignetting and/or missing tiles (8%), or due to non-existent UV sources to which our reduction method did not yield reliable photometry and are excluded from the final sample (10%). Despite the lack of data for these galaxies, the sample size is increased by ten-fold over previously available volumetric samples, and is thus, the largest catalogue of homogenized, spatially resolved photometry from the far-ultraviolet (1516Å) to the near-infrared (3.6μm) of nearby galaxies. The processed GALEX/S4G images, are eventually complemented by other images and catalogs, such as SDSS ugriz images, the original Spitzer images, HI cubes, and more, are available online via the publicly available DAGAL (Detailed Anatomy of Galaxies, FP7Marie Curie Actions project) image repository.