# HI-MaNGA: HI Followup for the MaNGA Survey

## TL;DR

The HI-MaNGA project enhances the MaNGA galaxy survey by adding HI 21cm radio observations, providing crucial gas content data to improve understanding of galaxy evolution.

## Contribution

This paper introduces the HI-MaNGA follow-up program, detailing its observational plans, initial data, and integration with existing HI surveys to augment galaxy evolution studies.

## Key findings

- First 331 galaxies observed with GBT in 2016
- Cross-matched MaNGA DR15 with ALFALFA HI data
- Enhanced dataset for studying galaxy gas content

## Abstract

We present the HI-MaNGA programme of HI follow-up for the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey. MaNGA, which is part of the Fourth phase of the Sloan Digital Sky Surveys (SDSS-IV), is in the process of obtaining integral field unit (IFU) spectroscopy for a sample of ~10,000 nearby galaxies. We give an overview of the HI 21cm radio follow-up observing plans and progress and present data for the first 331 galaxies observed in the 2016 observing season at the Robert C. Bryd Green Bank Telescope (GBT). We also provide a cross match of the current MaNGA (DR15) sample with publicly available HI data from the Arecibo Legacy Fast Arecibo L-band Feed Array (ALFALFA) survey. The addition of HI data to the MaNGA data set will strengthen the survey's ability to address several of its key science goals that relate to the gas content of galaxies, while also increasing the legacy of this survey for all extragalactic science.