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GALEX Arecibo SDSS Survey (GASS) and ALFALFA

GALEX Arecibo SDSS Survey (GASS) and ALFALFA. Barbara Catinella (MPA) on behalf of the GASS Team GALEX Science Team Meeting. Aspen, Mar 10 2009. G ALEX A recibo S DSS S urvey (GASS). D. Schiminovich (PI), B. Catinella, G. Kauffmann et al.

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GALEX Arecibo SDSS Survey (GASS) and ALFALFA

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  1. GALEX Arecibo SDSS Survey (GASS)and ALFALFA • Barbara Catinella (MPA) • on behalf of the GASS Team • GALEX Science Team Meeting. Aspen, Mar 10 2009

  2. GALEX Arecibo SDSS Survey (GASS) D. Schiminovich (PI), B. Catinella, G. Kauffmann et al. • Targeted HI survey: ~1000 galaxies selected from SDSS+GALEX MIS+ALFALFA footprints, 0.025< z <0.05, 10< log M✶/M⊙<11.5 • Galaxies observed down to gas mass fraction limit of 1.5% • Arecibo large program, observations started in March 2008 • First statistical sample of massive galaxies with homogeneously measured M✶, SFR and gas properties • understand physical processes that regulate gas accretion and its conversion into stars in massive systems. Transition between blue and red sequences. http://www.mpa-garching.mpg.de/GASS

  3. SDSS image ARECIBO HI spectrum zSDSS zHI 1’ (39 kpc @ z=0.033) SDSS optical spectrum • Single-dish HI profiles → redshift • rotational velocity • HI flux (→HI mass) GASS 57017: log M✶/M⊙=10.54 log MHI /M⊙=9.76 MHI /M✶= 17% W50 = 354 km/s (uncorr. for incl)

  4. Arecibo Legacy Fast ALFA (ALFALFA) Survey • Ongoing blind extragalactic HI survey, 7000 deg2, z<0.06 (PI: R. Giovanelli) • Started in Feb 2005, will detect >25,000 sources • Better sensitivity (8×), ang. res. (4×), spectral res. (3×) than HIPASS • MHI ~106 M⊙ out to 6.5 Mpc, MHI ~107 M⊙ out to 20 Mpc • DR1: Northern Virgo Cluster, 132 deg2 (Giovanelli et al. 2007) 730 detections, 69% new!! (cf. HIPASS in same region: 40) • designed to probe faint end of HIMF at z=0, will provide complete HI census • will contribute highest HI mass objects in GASS sample (~20%) ALFALFA footprint on SDSS

  5. GASS vs ALFALFA Left: GASS parent sample in region cataloged by ALFALFA (N=2795, contours). Symbols: ALFALFA detections (N=472. Red/blue: high/low inclination). Right: corresponding histograms. NUV-r is not corrected for extinction.

  6. GASS vs ALFALFA - cont. ALFALFA detections (N=472, blue. Only blue sequence showed on the right panel), new GASS detections (N=41, red) and upper limits (N=20, red triangles). NUV-r colors still uncorrected for galactic and internal extinction.

  7. GASS-detected transition galaxies NUV-r ➞ 11223 30175 3505 38748 23445 NUV-r>4.5 incl ≤650 1.5% gas fraction limit 29505

  8. GASS transition galaxies GASS 29505: spiral with 3% gas fraction GASS 3505: “red and dead” elliptical with 44% gas fraction!!Regrowing a disk? GASS 23445: early-type with 2% gas fraction

  9. GASS 3505: a gas-rich, “red and dead” galaxy 5″ • No emission lines • z=0.048 • NUV-r=5.9 • log M✶/M⊙=10.21 • log MHI /M⊙=9.85 MHI /M✶= 44% SDSS Arecibo HI SDSS + GALEX, 4´ (~220 kpc) field

  10. Other GASS detections 10″ GASS 38748: z=0.047, NUV-r=6.3, log M✶/M⊙=10.90, log MHI /M⊙=9.16, MHI /M✶= 2% 10″ GASS 3645: z=0.031, NUV-r=4.3, log M✶/M⊙=10.33, log MHI /M⊙=9.50, MHI /M✶= 15%

  11. GASS status • Final ~1000 galaxies extracted from GASS “parent sample” (N~12000). 128 already detected by ALFALFA or in Cornell HI archive. • 150 hours allocated since Mar 2008, mostly in 2009 • Observations done from MPA by BC and S. Fabello; more observers (including J. Wang, K. Zhang, J. Lemonias, S. Moran + others) to be trained in 2009 • 99 galaxies targeted: 41 detected, 20 upper limits, others in progress • Follow-up programs • optical long-slit spectroscopy (PI: S. Moran; 6.5m MMT, 3.5m Apache Point) for ~300 GASS targets. 54 resolved spectra obtained since Oct 2008. • VLA proposal to map 3 transition galaxies submitted in Feb 2009 • CO (IRAM): small proposal + large program to be submitted in 2009

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