2013/08/29 by J. B. Hutchings, L. Bianchi
Environmental Science · Physics and Astronomy · #Astronomy #Astrophysics #Galaxies: Formation, Evolution, Phenomena #Galaxy #Impact of Light on Environment and Health #Photometry (optics) #Physics #QSOS #Redshift #Remote Sensing in Agriculture #Stars #astro-ph.CO #astro-ph.GA
paper · pdf · doi:10.1016/j.asr.2013.08.013
published as Advances in Space Research,vol 53, 913-919, 2014 · 7 pages, 4 figures, 2 tables
openalex publication_date 2013/08/29 · arxiv created 2014/02/17 · arxiv updated 2015/06/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We use the combined photometric SDSS + GALEX database to look for populations of luminous blue star-forming galaxies. These were initially identified from such a sample at redshifts near 0.4, using SDSS spectra. We make use of the colour index previously defined to separate stars and QSOs, to locate more of these unusual galaxies, to fainter limits. They are found in significant numbers in two different regions of the related colour-magnitude plot. Within these regions, we use the ensemble 7-colour photometry to estimate the populations of blue star-forming galaxies at redshift near 0.4, and at redshift near 1, from a full photometric sample of over half a million, composed mostly of normal galaxies and QSOs.