Legacy ExtraGalactic Ultraviolet Survey: The HST View of Star Formation in Nearby Galaxies D . Calzetti 1 , J.C. Lee 2 , A. Adamo 3 , A. Aloisi 2 , J. Andrews 1 , T. M. Brown 2 , R. Chandar 4 , C. Christian 2 , M. Cignoni 2 , G. Clayton 5 ,
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The HST View of Star Formation in Nearby Galaxies
D. Calzetti1, J.C. Lee2, A. Adamo3, A. Aloisi2, J. Andrews1, T. M. Brown2, R. Chandar4, C. Christian2, M. Cignoni2, G. Clayton5,
R. da Silva6, S.E. de Mink7, C. Dobbs8, B. Elmegreen9, D. Elmegreen10, A. Evans11, M. Fumagalli7,23, J.S. Gallagher12,
D. Gouliermis13, E.K. Grebel13, A. Herrero14, B. Hilbert2, D.A. Hunter15, K.E. Johnson11, R.C. Kennicutt16, H. Kim17, D. Lennon18,
K. Levay2, C. Martin19, M. Krumholz6, P. Nair20, A. Nota21, A. Pellerin22, J. Prieto23, M. Regan2, J. Ryon12, E. Sabbi2, D. Schaerer24,
D. Schiminovich25, L.J. Smith21, D. Thilker26, M. Tosi27, S. Van Dyk19, R. Walterbos28, B.C. Whitmore2, A. Wofford29, S. Bright2, L. Ubeda2
(1U. of Massachusetts; 2STScI; 3MPIA; 4U. of Toledo; 5Louisiana State U.; 6UC Santa Cruz; 7Carnegie Obs.; 8U. of Exeter; 9IBM; 10Vassar College; 11U. of Virginia; 12U. of Wisconsin; 13U. of Heidelberg; 14IA de Canarias; 15Lowell Obs.;
16IoA Cambridge; 17Arizona State U.; 18ESA-ESAC; 19CalTech; 20U. of Alabama; 21STScI/ESA; 22SUNY-Geneseo; 23Princeton U.; 24Geneva Obs.; 25Columbia U.; 26Johns Hopkins U.; 27INAF-Bologna Obs.; 28NMSU; 29UPMC-CNRS/IAP)
Figure 3: Left: two color-composite GALEX FUV+NUV images of the LEGUS galaxies, ordered by morphological type, from early spirals at the top (Sa, T>0) to Irregulars at the bottom (T=10).
Figure 4: Below:Distribution of the Legus sample physical properties, in terms of SFR and sSFR (SFR/mass) as a function of morphological type T and stellar mass, respectively. LEGUS is complementary to archival HST imaging holdings, for galaxies within 12-15 Mpc.
NGC6503, 5 Mpc, NUV,B, I
Figure 5:Color-magnitude diagrams for the galaxy NGC6503 (Figure 1), shown in multiple band combinations for the horizontal axis. Point-sources are detected down to S/N=3
Figure 6: (U-B) vs. (V-I) two-color diagram for cluster candidates in NGC 6503 from our SExtractor catalog. The diagram shows objects with mF555W>26, and FWHMF555W>2.1 pixels. The SED models shown are from CB09 (Bruzual & Charlot 2011, Astr. Source Code Library 1104.005) with solar metallicity (Z=0.017, orange line) and ~2x solar metallicity (Z=0.04, red line).
A Taste of Science
Figure 1: Top Panel: three color-composite (blue=NUV, green=B, and red=I) of the LEGUS galaxy NGC6503; all images have been obtained with WFC3. Bottom Panel: the WFC3 footprint (blue) and the parallel ACS footprint (magenta) for this galaxy.
Figure 7: Three-color composite (NUV, B, I) of the central region of NGC5253, located at 3.7 Mpc distance, using a combination of WFC3 and ACS images. The 10 brightest clusters and the most dust-attenuated cluster (# 11) are marked by yellow circles and numbered. The size of the circles matches the size of the apertures used for photometric measurements. The largest circles are 0.5” in radius, corresponding to ~9 pc in linear size.
Figure 8: Photometry and SED modeling for two of the clusters shown in Figure 7. The moderately extincted Cluster 2, with an estimated age of 5 Myr and mass of ~15,000 Mo; and the dust-ensrouded Cluster 11, with a very preliminary age estimate of 1 Myr and mass estimate of about 4,000 Mo.
Figure 2:Footprint of the WFC3/F275W and F336W mosaic for NGC5457 (blue), overlaid on the archival ACS/B,V,I footprints (red outlines); the location of the parallel ACS is also shown (magenta) .
Based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with program GO -13364.
This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by JPL, CalTech, under contract with the National Aeronautics and Space Administration.