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The Arecibo Pisces-Perseus Supercluster Survey: An Undergraduate ALFALFA Team (UAT) Project

The Arecibo Pisces-Perseus Supercluster Survey: An Undergraduate ALFALFA Team (UAT) Project. Aileen O’Donoghue (SLU),

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The Arecibo Pisces-Perseus Supercluster Survey: An Undergraduate ALFALFA Team (UAT) Project

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  1. The Arecibo Pisces-Perseus Supercluster Survey:An Undergraduate ALFALFA Team (UAT) Project Aileen O’Donoghue (SLU), Rebecca Koopmann (Union), Martha Haynes (Cornell), Michael Jones (Cornell), David Craig (WTAMU), Gregory Hallenbeck (Union), Jessica Rosenberg (GMU) and Aparna Venkatesan (USF)

  2. The APPS Survey • The Pisces-Perseus Supercluster • Location, Morphology, Extent • Why is it interesting? • Current Knowledge • 21 cm Survey and ALFALFA • APPSS • What we seek to learn • Observation strategy • Preliminary results

  3. Pisces-Perseus Supercluster • Separate “watershed” from Laniakea http://www.nature.com/nature/journal/v513/n7516/full/nature13674.html A slice of the Laniakea supercluster in the supergalactic equatorial plane. RB Tully et al. Nature 513 , 71-73 (2014) doi:10.1038/nature13674

  4. Pisces-Perseus Supercluster • Ridge: 50h-1 Mpc (Perseus to Pegasus Clusters) • 5h-1 – 10h-1 Mpc deep, parallel to sky • Voids before & behind Sky Positions of AGC Galaxies (All Velocities) 7,679 Galaxies +50 4,549 Galaxies Declination (degrees) +20 4h 22h Right Ascension (degrees) 0 For H0 = 73 km/s/Mpc, Length ≈ 37 Mpc, Depth ≈ 6 Mpc Wegner, G., Haynes, M. P., & Giovanelli, R. 1993 AJ 105, 1251 (PP5)

  5. Pisces-Perseus Supercluster • The PPS Cone: Vhelio ~ 5,000 km/s 7,679 Galaxies Galaxies in variety of local densities at very similar distances. 22h 10,000 km/s 4h 5,000 km/s Wegner, G., Haynes, M. P., & Giovanelli, R. 1993 AJ 105, 1251 (PP5)

  6. ALFALFA PPS Results • Saintonge et al. 2008 (26° <  < 28° , 22h <  < 3h) • ALFALFA NOT going to fill in low end of mass function • 80% of (~2k) ALFALFA sources MHI > 109 M☉ 5 of these 6 galaxies are satellites of the NGC672/IC1727 system  ALFALFA not going to reveal many new dwarf galaxies Voids should contain many dwarfs!

  7. Extending ALFALFA • Arecibo L-Band Wide Observations • Seek low-mass galaxies within cz = 7,000 km/s  Extend low-mass end of mass function  Increase knowledge of PPS galaxies • Greater sample for morphology segregation • Infall velocities from Baryonic TF Relation • CDM  Void should have more dwarfs • Three Preliminary Fall Programs • Verifying ALFALFA detections with O.C.’s • Identify real detections without O.C.’s • Test SDSS & GALEX photometry target selection

  8. Extending ALFALFA • Arecibo L-Band Wide Observations • Seek low-mass galaxies within cz = 7,000 km/s  Extend low-mass end of mass function Log MHI LBW Fall Detections a.70 Fall Distance (Mpc)

  9. APPSS • L-Band Wide (LBW) Observations • 250 hours along PPS Ridge • 5-minute ON-OFF strategy • Expect to detect MHI ≥ 108 M⊙at dist. of PPS Jones & Koopmann, A2982, 2015, (after Erdoğdu et al. 2006, MNRAS, 373, 45) Galaxy Density Distribution (2MASS Redshift Survey)

  10. APPSS • Infall to ridge should align with line-of-sight • MHI < 109M☉ baryonic content dominated by cool gas • Select blue disk targets from SDSS & GALEX Sky Positions of AGC Galaxies (All Velocities) 7,679 Galaxies +50 4,549 Galaxies Declination (degrees) APPSS Region +20 4h 22h Right Ascension (degrees) 0

  11. APPSS Observations • Sample Detection: J225320.83+322407.3 6 4 2 Flux Density (mJy) 0 -2 5600 6000 6400 6800 Velocity (km/s) W50 = 125.1 ± 2.91 km/s  W20 = 128.91 ± 2.91 km/s  vsys = 6311.4 ± 2.1 km/s flux = 0.504 ± 0.0474 Jy km/s S/N = 9.30

  12. APPSS Preliminary Results • 319 Targets (A2982) • 173 detections • 92 non-detections • 54 uncertain (low S/N or RFI) From November 2016 observing log files Targets selected purely on the basis of GALEX-SDSS photometry, not detected by ALFALFA, and of unknown redshift.

  13. APPS Preliminary Work Posters on Thursday • Testing SDSS/GALEX Target Selection: Evan Smith et al. 342.15: Extending ALFALFA: Reducing LBW Observations of Optically Selected Galaxies • APPSS SDSS/GALEX Target Selection: David Craig etal. 342.13: Target Selection for the APPSS Acknowledgments: NSF AST-1211005, AST-0724918/0902211, AST-075267/0903394, AST-0725380, AST- 0847430, AST-1107390, NAIC

  14. APPSS Observations • Faint Galaxy: J000824.41+294547.0547 8 6 4 Flux Density (mJy) 2 0 -2 6000 6500 7000 7500 Velocity (km/s) W50 = 97.3 ± 6.0 km/s  W20 = 148. 3 ± 9.2 km/s  vsys = 6590.2 ± 2.1 km/s flux = 0.729 ± 0.0358 Jy km/s S/N = 5.78

  15. APPSS Observations • Background Galaxy: J000847.89+272325.7 8 6 4 Flux Density (mJy) 2 0 -2 11600 12000 12400 Velocity (km/s) W50 = 99.6 ± 6.4 km/s  W20 = 151.8 ± 9.8 km/s  vsys = 12116.18 ± 2.6 km/s flux = 0.795 ± 0.0434 Jy km/s S/N = 4.497

  16. APPSS Observations • Non-Detection: J000824.41+294547.0547 6 4 2 Flux Density (mJy) 0 -2 -4 3000 5000 7000 Velocity (km/s) W50 = ___ km/s  W20 = ___ km/s  vsys = ___ km/s flux = ___ Jy km/s S/N = ___

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