Deep H{\alpha} survey of the Coma cluster: The Catalog

TL;DR

This deep narrow-band imaging survey of the Coma cluster provides a comprehensive catalog of Hα emitting galaxies, including many new detections, enabling detailed studies of star formation across different environments within the cluster.

Contribution

The survey offers the first deep, wide-field Hα catalog of Coma cluster galaxies down to dwarf levels, with a new methodology for reliable emission line measurements.

Findings

Detected 124 Hα sources with 96 new detections

Extended Hα measurements to dwarf galaxy regime

Provided a comprehensive catalog for future star formation studies

Abstract

We present a deep wide-field narrow-band imaging survey of the local rich and dynamically relaxed Coma cluster of galaxies, carried out with the Wide Field Camera at the Isaac Newton Telescope. The survey covers a region of about 2.5 sq. deg. extending from the core of the cluster out to the infall region over the south-west quadrant of the Coma cluster. The $R$ (6380~\AA) and $[$S$\scriptstyle\rm II$$]$ (6725~\AA) filters of WFC/INT were used to derive the H$\alpha$+[N{\sc ii}] fluxes and equivalent widths of cluster galaxies distributed over a wide range of environmental conditions. The depth of our imaging observations allows us to measure reliably those properties well down into the dwarf regime in the Coma cluster for the first time. We have detected 124 H$\alpha$ emitting sources with spectroscopically-determined membership, 96 of which have not been detected previously. In this paper, we report on the data analysis process and the methodology we used to measure reliable H$\alpha$ properties, and present the measurement catalogue.