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Detection of the Diffuse H i Emission in the Circumgalactic Medium of NGC 891 and NGC 4565

Das, Sanskriti; Sardone, Amy; Leroy, Adam K.; Mathur, Smita; Gallagher, Molly; Pingel, Nickolas; Pisano, D. J.; Heald, G.


We present detections of 21 cm emission from neutral hydrogen (Hi) in the circumgalactic medium (CGM) of the local edge-on galaxies NGC 891 and NGC 4565 using the Robert C. Byrd Green Bank Telescope (GBT). With our 5σ sensitivity of $8.2\times {10}^{16}$ cm-2 calculated over a 20 km s-1 channel, we achieve $\gt 5\sigma $ detections out to $90\mbox{--}120\,\mathrm{kpc}$ along the minor axes. The velocity width of the CGM emission is as large as that of the disk $\approx 500$ km s−1, indicating...[Show more]

CollectionsANU Research Publications
Date published: 2020-07-17
Type: Journal article
Source: The Astrophysical Journal
DOI: 10.3847/1538-4357/ab97b9
Access Rights: Open Access


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