2024RNAAS...8...24K

We present new H I observations of the REionization-Limited H I Cloud (RELHIC) candidate, M94-CL9, detected around M94 by Zhou et al. using the Five-hundred-meter Aperture Spherical Telescope (FAST). M94-CL9's H I 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 detect greater H I emission in M94-CL9 and result in H I properties that are larger (corrected velocity width, W_50,c,t = 35.7 ± 0.6 km s^–1; and integrated flux, ∫Sdv = 0.28 ± 0.04 Jy km s^–1) than those found by Zhou et al. but that match those from the FAST All-Sky H I 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.