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arXiv · 2512.23899

The Tianlai-WIYN North Celestial Cap Redshift Survey

Reza Ansari·Gabriela A. Marques·John P. Marriner·Olivier Perdereau·Elena Pinetti·Lily Robinthal·Albert Stebbins·Haoxuan Sun·Peter Timbie·Gregory S. Tucker·Eli Doyle·Jocelyn Chu·E. Revsen Karaalp·Xuelei Chen·Jixia Li·Fengquan Wu
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Abstract

We present the results of a small, low redshift spectroscopic survey of galaxies within 3 degrees of the North Celestial Pole (NCP) selected using V-band photometry obtained from the North Celestial Cap Survey (NCCS) (Gorbikov & Brosch 2014). The purpose of the current survey is to create a redshift space template for 21 cm emission from neutral hydrogen with which to correlate radio line intensity observations by the Tianlai dish and cylinder interferometers. A total of 898 redshifts were obtained from the 2102 extended objects in the NCCS with m_V < 19 in the survey area. After accounting for extinction, the survey geometry and selection effects, the number density and clustering pattern of galaxies in the redshift catalog are consistent with other low redshift surveys. We were also able to identify 11 galaxy cluster candidates from this redshift catalog.

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Reza Ansari, Gabriela A. Marques, John P. Marriner, Olivier Perdereau, Elena Pinetti, Lily Robinthal, Albert Stebbins, Haoxuan Sun, Peter Timbie, Gregory S. Tucker, Eli Doyle, Jocelyn Chu, E. Revsen Karaalp, Xuelei Chen, Jixia Li, Fengquan Wu. 2025-12-29. The Tianlai-WIYN North Celestial Cap Redshift Survey. https://arxiv.org/abs/2512.23899

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