EZOA – a catalogue of EBHIS H i-detected galaxies in the northern Zone of Avoidance

Abstract

We present a catalogue of galaxies in the northern Zone of Avoidance (ZoA), extracted from the shallow version of the blind H i survey with the Effelsberg 100 m radio telescope, EBHIS, that has a sensitivity of 23 mJy beam −1 at 10.24 km s −1 velocity resolution. The catalogue comprises 170 detections in the region δ ≥ −5 • and |b| < 6 • . About a third of the detections (N = 67) have not been previously recorded in H i. While 29 detections have no discernible counterpart at any wavelength other than H i, 48 detections (28%) have a counterpart visible on optical or NIR images but are not recorded as such in the literature. New H i detections were found as close as 7.5 Mpc (EZOA J2120+45), and at the edge of the Local Volume, at 10.1 Mpc, we have found two previously unknown dwarf galaxies (EZOA J0506+31 and EZOA J0301+56). Existing large-scale structures crossing the northern ZoA have been established more firmly by the new detections, with the possibility of new filaments. We conclude that the high rate of 39% new H i detections in the northern ZoA, which has been extensively surveyed with targeted observations in the past, proves the power of blind H i surveys. The full EBHIS survey, which will cover the full northern sky with a sensitivity comparable to the HIPASS survey of the southern sky, is expected to add many new detections and uncover new structures in the northern ZoA.

WALLABY – an SKA Pathfinder H i survey

“…Data acquisition with a high time resolution of 0.5 s (Flöer and Winkel 2012) enabled flagging of timevariable RFI. While the compilation of the full extragalactic catalogue is awaiting completion of the final survey scans (Flöer et al 2014), a catalogue from the shallow survey of the northern Zone of Avoidance (δ > −5 • , |b| ≤ 6 • ) is already available by Schröder et al (2019).…”

WALLABY -- An SKA Pathfinder HI Survey

“…Data acquisition with a high time resolution of 0.5 s (Flöer & Winkel 2012) enabled flagging of time-variable RFI. While the compilation of the full extragalactic catalogue is awaiting completion of the final survey scans (Flöer, Winkel & Kerp 2014), a catalogue from the shallow survey of the northern Zone of Avoidance (δ > −5 • , |b| ≤ 6 • ) is already available by Schröder et al (2019).…”

The VVV Near-IR Galaxy Catalogue beyond the Galactic disk

“…They then compared their results with a dozen known galaxy clusters, including the presence of the more distant Vela super-cluster (Kraan-Korteweg et al 2017), and found a remarkable agreement. Finally, Schröder et al (2019b) presented detections of 170 galaxies in the northern ZoA at |𝑏| < 6 • , of which a third of these had no previous HI observations.…”