A Bigger Cloud 9? New HI Observations of the RELHIC Candidate M94-Cloud 9
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866916094339448832 |
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| author | Karunakaran, Ananthan Spekkens, Kristine |
| author_facet | Karunakaran, Ananthan Spekkens, Kristine |
| contents | 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, $W_{50,c,t}=35.7\pm0.6\,\mathrm{km\,s^{-1}}$; and integrated flux, $\int\mathrm{Sdv}=0.28\pm0.04\,\mathrm{Jy}\cdot\mathrm{km\,s^{-1}}$) 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2401_08765 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A Bigger Cloud 9? New HI Observations of the RELHIC Candidate M94-Cloud 9 Karunakaran, Ananthan Spekkens, Kristine Astrophysics of Galaxies 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, $W_{50,c,t}=35.7\pm0.6\,\mathrm{km\,s^{-1}}$; and integrated flux, $\int\mathrm{Sdv}=0.28\pm0.04\,\mathrm{Jy}\cdot\mathrm{km\,s^{-1}}$) 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. |
| title | A Bigger Cloud 9? New HI Observations of the RELHIC Candidate M94-Cloud 9 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2401.08765 |