1. Aileen O’Donoghue (SLU),
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 Current Knowledge
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
A slice of the Laniakea
supercluster in the supergalactic
equatorial plane.
RB Tully et al. Nature 513 , (2014) doi: /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)
+50
7,679 Galaxies
4,549 Galaxies
Declination (degrees)
+20
Right Ascension (degrees) 4h
22h
For H0 = 73 km/s/Mpc, Length ≈ 37 Mpc, Depth ≈ 6 Mpc
Wegner, G., Haynes, M. P., & Giovanelli, R AJ 105, 1251 (PP5)

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

6. 5 of these 6 galaxies are satellites of the NGC672/IC1727 system
ALFALFA PPS Results
Saintonge et al (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 Log MHI
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. Galaxy Density Distribution (2MASS Redshift Survey)
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 , 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)
+50
7,679 Galaxies
4,549 Galaxies
Declination (degrees)
APPSS Region
+20
Right Ascension (degrees) 4h
22h

11. APPSS Observations Sample Detection: J225320.83+322407.36 4 2
Flux Density (mJy) -2
5600
6000
6400
6800
Velocity (km/s)
W50 = ± 2.91 km/s 
W20 = ± 2.91 km/s 
vsys = ± 2.1 km/s
flux = ± 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 :
Extending ALFALFA: Reducing LBW Observations of Optically Selected Galaxies
APPSS SDSS/GALEX Target Selection:
David Craig et al :
Target Selection for the APPSS
Acknowledgments: NSF AST , AST / , AST / , AST , AST , AST , NAIC

14. APPSS Observations Faint Galaxy: J000824.41+294547.05476 4
Flux Density (mJy) 2 -2
6000
6500
7000
7500
Velocity (km/s)
W50 = 97.3 ± 6.0 km/s 
W20 = ± 9.2 km/s 
vsys = ± 2.1 km/s
flux = ± Jy km/s
S/N = 5.78

15. APPSS Observations Background Galaxy: J000847.89+272325.76 4
Flux Density (mJy) 2 -2
11600
12000
12400
Velocity (km/s)
W50 = 99.6 ± 6.4 km/s 
W20 = ± 9.8 km/s 
vsys = ± 2.6 km/s
flux = ± Jy km/s
S/N = 4.497

16. APPSS Observations Non-Detection: J000824.41+294547.05476 4 2
Flux Density (mJy) -2 -4
3000
5000
7000
Velocity (km/s)
W50 = ___ km/s 
W20 = ___ km/s 
vsys = ___ km/s
flux = ___ Jy km/s
S/N = ___