The Arecibo Pisces–Perseus Supercluster Survey. I. Harvesting ALFALFA

We report a multi-objective campaign of targeted 21 cm H i line observations of sources selected from the Arecibo Legacy Fast Arecibo L-band Feed Array (ALFALFA) survey and galaxies identified by their morphological and photometric properties in the Sloan Digital Sky Survey. The aims of this program have been (1) to confirm the reality of some ALFALFA sources whose enigmatic nature suggest additional multiwavelength observations; (2) to probe the low signal-to-noise ratio (S/N) regime, below the ALFALFA reliability limit; and (3) to explore the feasibility of using optical morphology, color, and surface brightness to identify gas-rich objects in the region of the Pisces–Perseus Supercluster (PPS) whose H i fluxes are below the ALFALFA sensitivity limit at that distance. As expected, the reliability of ALFALFA detections depends strongly on the S/N of the H i line signal and its coincidence with a probable stellar counterpart identified by its optical properties, suggestive of ongoing star formation. The identification of low-mass, star-forming populations enables targeted H i line observations to detect galaxies with H i line fluxes below the ALFALFA sensitivity limits in fixed local volumes (D < 100 Mpc). The method explored here serves as the basis for extending the sample of gas-bearing objects as part of the ongoing Arecibo Pisces–Perseus Supercluster Survey (APPSS).

Title	The Arecibo Pisces–Perseus Supercluster Survey. I. Harvesting ALFALFA
Creator	Koopmann, R. A.
	Haynes, M. P.
	O'Donoghue, A. A.
	Miller, J. R.
	Balonek, T. J.
	Hallenbeck, G. L.
	Giovanelli, R.
	Hoffman, G. Lyle
	Craig, D. W.
	Kornreich, D. A.
	Jones, M. G.
	Leisman, L.
Publisher	Astronomical Journal
Academic Department	Physics
Division	Natural Sciences
Organization	Lafayette College
Date Issued	February 2019
Date Available	2019-02-05T15:38:47Z
Type	Article
Language	English
Keyword	galaxies: clusters: general
	large-scale structure of universe
	radio lines: galaxies
	galaxies: distances and redshifts
	surveys
Bibliographic Citation	O'Donoghue, A. A., et al. (2019) “The Arecibo Pisces–Perseus Supercluster Survey. I. Harvesting ALFALFA.” Astronomical Journal 157 (2): Article 81.
Standard Identifier	Handle 10385/2770
Standard Identifier	DOI 10.3847/1538-3881/aaf890
Permalink	http://hdl.handle.net/10385/2770
Rights Statement	In Copyright
Rights Holders	American Astronomical Society