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Exploring Color-Color Diagrams for Galaxy and Star Analysis in Astronomy Research

Join us as we delve into color-color diagrams g-r vs. u-g for galaxies and stars, comparing red and black distinctions. We match data from the A611 field with SDSS objects, exploring redshift distributions and aperture magnitudes. Our plans include settling on star/galaxy samples, comparing pipeline ellipticities, and extracting stable mass profiles by February's end. Let's uncover the secrets of the cosmos together!

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Exploring Color-Color Diagrams for Galaxy and Star Analysis in Astronomy Research

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  1. Owls update Owls Team Feb 4 2008

  2. Outline • Last time: showed star/galaxy separation through fwhm/mag, mu_max/mag, stellarity plots • Also showed the cluster red sequence • Today we’ll concentrate on color-color diagrams

  3. g-r vs. u-g for galaxies (contours) and stars (dots) (Strateva et. al. ; 2001)

  4. g-r vs. u-g for galaxies (contours) and stars (dots) Stars = red Galaxies = black

  5. Color-color plot (sdss colors) Matched with our Objects from the A611 field Red = zp < 0.3 Black = zp > 0.3 (SDSS model magnitude – from best fit to deVauc or exp’l profile)

  6. Color-color plot (LBC colors) Matched with SDSS Objects from the A611 field Red = zp < 0.3 Black = zp > 0.3 (Aperture magnitude from aperture matched sextraction)

  7. Redshift distribution (after SDSS color cut) Photo z from Sloan All Color foreground Color background

  8. Redshift distribution ,(after our color cut) All Color background Color foreground

  9. G and R, LBC-SDSS Mags LBC = Aperture Magnitude SDSS = Model Magnitude (Still in progress)

  10. Back-Up slides

  11. Current plans • Stage 1: We will settle on common star foreground/bkgd galaxy samples • Stage 2: compare the psf in the 2 pipelines: • - Compare using pipeline defined ellipticities, pre- and post- deconvln • - Give outline of how imcat removes psf • Stage 3: removing the psf, binning galaxies radially, and extracting a mass profile.

  12. Plans cont. • Stage 4. fit to functional forms, and extract masses, concentrations etc. • (Aim to settle all this by end of Feb  extract stable mass profiles) • Stage 5. ultimately, do cosmology with several clusters

  13. G-band star map – using e from imcat Chip boundaries: x = 2260, x = 4380, y = 4800

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