H i observations of galaxies in the southern filament of the Virgo Cluster with the Square Kilometre Array Pathfinder KAT-7 and the Westerbork Synthesis Radio Telescope

Sorgho, A.; Hess, Kelley M.; Carignan, C.; Oosterloo, Tom

doi:10.1093/mnras/stw2341

Cited by 23 publications

(22 citation statements)

References 64 publications

(67 reference statements)

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“…There are effectively two strategies for the combination of interferometric data sets. In the first, appropriately weighted uv visibilities are combined in the image plane (e.g., Sorgho et al 2017). In the second, the visibilities are weighted, combined in the uv plane, and imaged by deconvolving with a beam that combines the shape of the beams for the input data sets (e.g., Bernstein-Cooper et al 2014).…”

Section: Combination Imagingmentioning

confidence: 99%

The Enigmatic (Almost) Dark Galaxy Coma P: The Atomic Interstellar Medium

Ball

Cannon

Adams

et al. 2018

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We present new high-resolution H I spectral line imaging of Coma P, the brightest H I source in the system HI 1232 +20. This galaxy with extremely low surface brightness was first identified in the ALFALFA survey as an "(Almost) Dark" object: a clearly extragalactic H I source with no obvious optical counterpart in existing optical survey data (although faint ultraviolet emission was detected in archival GALEX imaging). Using a combination of data from the Westerbork Synthesis Radio Telescope and the Karl G. Jansky Very Large Array, we investigate the H I morphology and kinematics at a variety of physical scales. The H I morphology is irregular, reaching only moderate maxima in mass surface density (peak M 10 H I s~ pc −2 ). Gas of lower surface brightness extends to large radial distances, with the H I diameter measured at 4.0±0.2 kpc inside the M 1  pc −2 level. We quantify the relationships between mass surface density of H I gas and star formation on timescales of ∼100-200 Myr as traced by GALEX far-ultraviolet emission. While Coma P has regions of dense H I gas reaching the N 10 I I scaling relation. It is either too large for its H I mass, has too low an H I mass for its H I size, or the two H I components artificially extend its H I size. Coma P lies within the empirical scatter at the faint end of the baryonic Tully-Fisher relation, although the complexity of the H I dynamics complicates the interpretation. Along with its large ratio of H I to stellar mass, the collective H I characteristics of Coma P make it unusual among known galaxies in the nearby universe.

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Section: Combination Imagingmentioning

confidence: 99%

The Enigmatic (Almost) Dark Galaxy Coma P: The Atomic Interstellar Medium

Ball

Cannon

Adams

et al. 2018

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“…• H i tail on NGC 4424 originally seen by VIVA (Chung et al 2007) and with a large extension detected by Sorgho et al (2017). While they have a combined WSRT and KAT-7 dataset, both with similar column density sensitivities, this extension is only seen in their KAT-7 data (see their Figure 5 and associated discussion).…”

Section: Resultsmentioning

confidence: 88%

“…• KW Cloud detected by Sorgho et al (2017) near NGC 4451. This is not detected by WAVES despite being well above the sensitivity limit, nor was it seen in the ALFALFA data by Kent et al (2007) where (based on the stated mass and velocity width) it should have fallen above their 6.5σ confident detection threshold.…”

Section: Resultsmentioning

confidence: 99%

The Widefield Arecibo Virgo Extragalactic Survey: Early Results on Known Dark Sources

Minchin,

Taylor,

Deshev

2021

Preprint

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The Widefield Arecibo Virgo Extragalactic Survey (WAVES) was an ongoing H i survey of the Virgo Cluster with the Arecibo Observatory's 305-m William E. Gordon Telescope at the time of its structural failure. The full 20 square degrees of the southern field and 10 of the planned 35 square degrees of the northern field had been observed to full depth, adding to 25 square degrees observed to the same depth in the cluster by the Arecibo Galaxy Environment Survey (AGES). We here review what WAVES reveals about four optically-dark H i structures that were previously discovered in the survey area, including two that are not seen despite being well above our detection limit

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“…As far as Hi science is concerned, it was proposed to observe 2-3 spirals in the ∼ 20 0 common DEC strip (+0 o to +20 o ) (e.g. NGC 3521 at DEC ∼ 0 o ), where we could reach low column densities much faster by combining FAST & MeerKAT data and probably combine the data in the map (column density) plane as was done by combining KAT-7 and WSRT data for a southern extension of the Virgo cluster (Sorgho et al 2017). This study succeded to reach column density limits of 8 × 10 17 cm −2 and uncovered the long 60 kpc tail of the galaxty NGC 4424 (Figure 14).…”

Section: Combining Hi Data From Meerkat and Fastmentioning

confidence: 99%

Cosmic Web Research: Where are the Missing Dwarf Galaxies and the Inter-Galactic Hi Clouds

Carignan

2018

Proc. IAU

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We know that the observed H i (and H2) content cannot explain the SFR observed in galaxies. The only way galaxies can sustain that SFR is by accreting HI-rich dwarf galaxies or Inter-Galactic HI clouds. However, no observation to detect those accretion events has been conclusive so far. Instruments having the necessary sensitivity (e.g. GBT) lack the necessary spatial resolution and those with the proper resolution (e.g. VLA) lack the sensitivity. I will show that both are necessary to detect those illusive Hi clouds. The SKA precursor MeerKAT is starting its operation as we speak and will start the Large Survey Programs at the end of 2018. FAST has started its observations in drift scan mode with CRAFTS (Commensal Radio Astronomy Fast Survey). In the near future (2019-20), the best combination to study low column density H i will be to combine the sensitivity of FAST with the spatial resolution of MeerKAT.

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H i observations of galaxies in the southern filament of the Virgo Cluster with the Square Kilometre Array Pathfinder KAT-7 and the Westerbork Synthesis Radio Telescope

Cited by 23 publications

References 64 publications

The Enigmatic (Almost) Dark Galaxy Coma P: The Atomic Interstellar Medium

The Enigmatic (Almost) Dark Galaxy Coma P: The Atomic Interstellar Medium

The Widefield Arecibo Virgo Extragalactic Survey: Early Results on Known Dark Sources

Cosmic Web Research: Where are the Missing Dwarf Galaxies and the Inter-Galactic Hi Clouds

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