The WSRT ZoA Perseus-Pisces filament wide-field H i imaging survey – I. H i catalogue and atlas

Ramatsoku, M.; Verheijen, Marc; Kraan-Korteweg, R. C.; Józsa, G. I. G.; Schröder, A. C.; Jarrett, T. H.; Elson, Ed; Driel, W. van; Blok, W. J. G. de; Henning, P. A.

doi:10.1093/mnras/stw968

Cited by 29 publications

(38 citation statements)

References 68 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is further motivation to recent efforts made to observe close to the ZOA (Sorce et al 2012(Sorce et al , 2014bNeill et al 2014) or even in the ZOA (Kraan-Korteweg et al 1994;Donley et al 2006;Williams et al 2014;Staveley-Smith et al 2016;Said et al 2016a,b;Ramatsoku et al 2016). …”

Section: Brief Excursion In the Uncertainty Regimementioning

confidence: 56%

Towards an optimal sampling of peculiar velocity surveys for Wiener Filter reconstructions

Sorce

Hoffman

Gottlöber

2017

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

The Wiener Filter (WF) technique enables the reconstruction of density and velocity fields from observed radial peculiar velocities. This paper aims at identifying the optimal design of peculiar velocity surveys within the WF framework. The prime goal is to test the dependence of the quality of the reconstruction on the distribution and nature of data points. Mock datasets, extending to 250 h −1 Mpc, are drawn from a constrained simulation that mimics the local Universe to produce realistic mock catalogs. Reconstructed fields obtained with these mocks are compared to the reference simulation. Comparisons, including residual distributions, cell-to-cell and bulk velocities, imply that the presence of field data points is essential to properly measure the flows. The fields reconstructed from mocks that consist only of galaxy cluster data points exhibit poor quality bulk velocities. In addition, the quality of the reconstruction depends strongly on the grouping of individual data points into single points to suppress virial motions in high density regions. Conversely, the presence of a Zone of Avoidance hardly affects the reconstruction. For a given number of data points, a uniform sample does not score any better than a sample with decreasing number of data points with the distance. The best reconstructions are obtained with a grouped survey containing field galaxies: Assuming no error, they differ from the simulated field by less than 100 km s −1 up to the extreme edge of the catalogs or up to a distance of three times the mean distance of data points for non-uniform catalogs. The overall conclusions hold when errors are added.

show abstract

Section: Brief Excursion In the Uncertainty Regimementioning

confidence: 56%

Towards an optimal sampling of peculiar velocity surveys for Wiener Filter reconstructions

Sorce

Hoffman

Gottlöber

2017

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

show abstract

“…Following Ramatsoku et al (2016) we classify galaxies as detected if there are a number of consecutive channels above a threshold value. The threshold values are set based on the noise level of the individual spectra which we estimate using the sub-interquartile range (IQR -half the difference between the 75 th and 25 th flux percentiles).…”

Section: Accounting For Known Contamination Sourcesmentioning

confidence: 99%

hiss, a new tool for H i stacking: application to NIBLES spectra

Healy

Blyth

Elson

et al. 2019

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

H i stacking has proven to be a highly effective tool to statistically analyse average H i properties for samples of galaxies which may or may not be directly detected. With the plethora of H i data expected from the various upcoming H i surveys with the SKA Precursor and Pathfinder telescopes, it will be helpful to standardize the way in which stacking analyses are conducted. In this work we present a new python-based package, HISS, designed to stack H i (emission and absorption) spectra in a consistent and reliable manner. As an example, we use HISS to study the H i content in various galaxy sub-samples from the NIBLES survey of SDSS galaxies which were selected to represent their entire range in total stellar mass without a prior colour selection. This allowed us to compare the galaxy colour to average H i content in both detected and non-detected galaxies. Our sample, with a stellar mass range of 10 8 < M (M ) < 10 12 , has enabled us to probe the H i-to-stellar mass gas fraction relationship more than half an order of magnitude lower than in previous stacking studies.

show abstract

“…(5) The tail-end of the Perseus-Pisces filament that crosses the ZoA in Cygnus at l ∼ 90 • and which has been discussed extensively by Ramatsoku et al (2016) and Kraan-Korteweg et al (2018), has also been strengthened despite the drop in sensitivity of our survey for redshifts above 4000 km s −1 .…”

Section: Large-scale Structuresmentioning

confidence: 75%

“…This limitation is basically due to the fact that SoFiA has not been equipped with baseline subtraction which is obsolete for the interferometric data cubes for which SoFiA is primarily intended. However, the increased number of continuum sources in the ZoA introduces many artefacts that cannot be fully removed and which affect baselines also in interferometric data (Ramatsoku et al 2016). In other words, real data cubes from the ZoA differ considerably from the averaged simulated interferometric cubes which were used to optimise the automated source finders.…”

Section: The Sofia Packagementioning

confidence: 99%

EZOA – a catalogue of EBHIS H i-detected galaxies in the northern Zone of Avoidance

Schröder

Flöer²,

Winkel³

et al. 2019

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

We present a catalogue of galaxies in the northern Zone of Avoidance (ZoA), extracted from the shallow version of the blind H i survey with the Effelsberg 100 m radio telescope, EBHIS, that has a sensitivity of 23 mJy beam −1 at 10.24 km s −1 velocity resolution. The catalogue comprises 170 detections in the region δ ≥ −5 • and |b| < 6 • . About a third of the detections (N = 67) have not been previously recorded in H i. While 29 detections have no discernible counterpart at any wavelength other than H i, 48 detections (28%) have a counterpart visible on optical or NIR images but are not recorded as such in the literature. New H i detections were found as close as 7.5 Mpc (EZOA J2120+45), and at the edge of the Local Volume, at 10.1 Mpc, we have found two previously unknown dwarf galaxies (EZOA J0506+31 and EZOA J0301+56). Existing large-scale structures crossing the northern ZoA have been established more firmly by the new detections, with the possibility of new filaments. We conclude that the high rate of 39% new H i detections in the northern ZoA, which has been extensively surveyed with targeted observations in the past, proves the power of blind H i surveys. The full EBHIS survey, which will cover the full northern sky with a sensitivity comparable to the HIPASS survey of the southern sky, is expected to add many new detections and uncover new structures in the northern ZoA.

show abstract

The WSRT ZoA Perseus-Pisces filament wide-field H i imaging survey – I. H i catalogue and atlas

Cited by 29 publications

References 68 publications

Towards an optimal sampling of peculiar velocity surveys for Wiener Filter reconstructions

Towards an optimal sampling of peculiar velocity surveys for Wiener Filter reconstructions

hiss, a new tool for H i stacking: application to NIBLES spectra

EZOA – a catalogue of EBHIS H i-detected galaxies in the northern Zone of Avoidance

Contact Info

Product

Resources

About