We present new HI observations of the REionization-Limited HI Cloud (RELHIC) candidate, M94-CL9, detected around M94 by Zhou et al. using the Five-hundred-meter Aperture Spherical Telescope (FAST). M94-CL9's HI properties as detected by FAST are consistent with a RELHIC as noted by Benitez-Llambay & Navarro. Our observations with the Robert C. Byrd Green Bank Telescope (GBT) detect greater HI emission in M94-CL9 and result in HI properties that are larger (corrected velocity width, W50,c,t=35.7±0.6kms−1; and integrated flux, ∫Sdv=0.28±0.04Jy⋅kms−1) than those found by Zhou et al. but that match those from the FAST All-Sky HI (FASHI) survey. These larger properties do not preclude M94-CL9 from being a RELHIC, but the wider spectral extent and spectral asymmetry reported here may be in tension with predictions of RELHIC properties.
@article{arxiv.2401.08765,
title = {A Bigger Cloud 9? New HI Observations of the RELHIC Candidate M94-Cloud 9},
author = {Ananthan Karunakaran and Kristine Spekkens},
journal= {arXiv preprint arXiv:2401.08765},
year = {2024}
}