An Overview of the MHONGOOSE Survey: Observing Nearby Galaxies with MeerKAT

Blok, W. J. G. de; Adams, Elizabeth A. K.; Amram, P.; Athanassoula, E.; Bagetakos, Ioannis; Balkowski, C.; Bershady, M. A.; Beswick, R.; Bigiel, Frank; Blyth, S. L.; Bosma, A.; Booth, R. S.; Bouchard, Antoine; Brinks, E.; Carignan, C.; Chemin, L.; Combes, F.; Conway, Joan M.; Elson, Edward C.; English, Jayanne; Épinat, B.; Frank, B. S.; Fiege, Jason D.; Fraternali, Filippo; Gallagher, J.; Gibson, Brad K.; Heald, G.; Henning, P. A.; Holwerda, Benne W.; Jarrett, T. H.; Jerjen, H.; Józsa, G. I. G.; Kapala, Maria; Klöckner, H. R.; Koribalski, Baerbel; Kraan-Korteweg, R. C.; León, S. Coutińo de; Leroy, Adam K.; Loubser, S. I.; Lucero, D. M.; McGaugh, Stacy S.; Meurer, G. R.; Meyer, M.; Mogotsi, Moses; Namumba, B.; Oh, S. Peng; Oosterloo, Thomas; Pisano, D. J.; Popping, Attila; Ratcliffe, S.; Sellwood, J. A.; Schinnerer, E.; Schröder, A. C.; Sheth, Kartik; Smith, M. W. L.; Sorgho, A.; Spekkens, Kristine; Stanimirović, Snežana; Heyden, K. van der; Driel, W.D. van; Verdes–Montenegro, L.; Walter, Fabian; Westmeier, T.; Wilcots, Eric M.; Williams, T. B.; Wong, O. Ivy; Woudt, P. A.; Zijlstra, A. A.

doi:10.48550/arxiv.1709.08458

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“…The low number of sources studied in this work inhibit any conclusions. We will continue to build our statistical sample with future analysis of the HALOGAS, THINGS, and ultimately the MeerKAT HI Observations of Nearby Galactic Objects: Observing Southern Emitters (MHONGOOSE; de Blok et al 2017) and the Imaging Galaxies Inter-galactic and Nearby Environment (IMAGINE) galaxy samples in order to for correlations between presence a significant diffuse environment and intrinsic properties which the IGM the…”

Section: The Relationship Between Diffuse Hi and Coldmentioning

confidence: 99%

A GBT Survey of the HALOGAS Galaxies and Their Environments. I. Revealing the Full Extent of H i around NGC 891, NGC 925, NGC 4414, and NGC 4565

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et al. 2018

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We present initial results from a deep neutral hydrogen (Hi) survey of the HALOGAS galaxy sample, which includes the spiral galaxies NGC891, NGC925, NGC4414, and NGC4565, performed with the Robert C. Byrd Green Bank Telescope (GBT). The resulting observations cover at least four deg 2 around these galaxies with an average 5σ detection limit of 1.2×10 18 cm −2 over a velocity range of 20 km s −1 and angular scale of 9.1 . In addition to detecting the same total flux as the GBT data, the spatial distribution of the GBT and original Westerbork Synthesis Radio Telescope (WSRT) data match well at equal spatial resolutions. The Hi mass fraction below Hi column densities of 10 19 cm −2 is, on average, 2%. We discuss the possible origins of low column density Hi of nearby spiral galaxies. The absence of a considerable amount of newly detected Hi by the GBT indicates these galaxies do not have significant extended diffuse Hi structures, and suggests future surveys planned with the SKA and its precursors must go at least as deep as 10 17 cm −2 in column density to significantly increase the probability of detecting Hi associated with the cosmic web and/or cold mode accretion.

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Section: The Relationship Between Diffuse Hi and Coldmentioning

confidence: 99%