The Nancay HI Zone of Avoidance survey of 2MASS bright galaxies

Abstract

To complement the 2MASS Redshift Survey (2MRS) and the 2MASS Tully-Fisher survey (2MTF) a search for 21cm HI line emission of 2MASS bright galaxy candidates has been pursued along the dust-obscured plane of the Milky Way with the 100m Nancay Radio Telescope. For our sample selection we adopted an isophotal extinction-corrected K-band magnitude limit of $K_s^o=11.25$mag, corresponding to the first 2MRS data release and 2MTF, for which the 2MASX completeness level remains fairly constant deep into the Zone of Avoidance (ZoA). About one thousand galaxies without prior redshift measurement accessible from Nancay (Dec > -40°) were observed to an rms noise level of ~3 mJy for the velocity range -250 to 10'600 km/s. This resulted in 220 clear and 12 marginal detections of the target sample. Only few detections have redshifts above 8000 km/s due to recurring radio frequency interference (RFI). A further 29 detections and 6 marginals have their origin in non-target galaxies in the telescope beam. The newly detected galaxies are on average considerably more \HI-rich (mostly $10^9-10^{10}$M${}_{\odot }$) compared to systematic (blind) HI surveys. The HI detections reveal various new filaments crossing the mostly uncharted northern ZoA (e.g. at $\ell \sim 90°,130°,160°$), whilst consolidating galaxy agglomerations in Monoceros and Puppis ($\ell \sim 220°,240°$). Considerably new insight has been gained about the extent of the Perseus-Pisces Supercluster through the confirmation of a ridge ($\ell \sim 160°$) encompassing the 3C129 cluster that links Perseus-Pisces to Lynx, and the continuation of the second Perseus-Pisces arm ($\ell \sim 90°$) across the ZoA.

19 pages, 11 figures, 7 tables; accepted for publication in MNRAS; supplementary material available at http://www.acgc.uct.ac.za/~kraan/NRT_ZOA/Supplement.pdf

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Cited by in corpus (15)

• The 2MASS Redshift Survey in the Zone of Avoidance
• The 2MASS redshift survey galaxy group catalogue derived from a graph-theory based friends-of-friends algorithm
• The VVV Near-IR Galaxy Catalogue beyond the Galactic disk
• EZOA -- A catalogue of EBHIS HI detected galaxies in the northern Zone of Avoidance
• A Zone of Avoidance catalogue of 2MASS bright galaxies. I. Sample description and analysis
• The Cosmic Large-Scale Structure in X-rays (CLASSIX) cluster survey IV: Superclusters in the local Universe at z <= 0.03
• The Cosmic Large-Scale Structure in X-rays (CLASSIX) Cluster Survey III: The Perseus-Pisces supercluster and the Southern Great Wall as traced by X-ray luminous galaxy clusters
• The VVV near-IR galaxy catalogue in a Northern part of the Galactic disc
• The Arecibo L-band Feed Array Zone of Avoidance (ALFAZOA) Shallow Survey
• The Distance and Peculiar Velocity of the Norma cluster (ACO 3627) using the Near-Infrared $J$ and $K_s$-band Fundamental Plane Relations
• A comparative analysis of Galactic extinction at low Galactic latitudes
• A near-infrared study of the obscured 3C129 galaxy cluster
• Faint galaxies in the Zone of Avoidance revealed by JWST/NIRCam
• A galaxy cluster in the innermost Zone of Avoidance, close to the radio phoenix VLSSJ2217.5+594
• Galaxy clustering in the VVV Near-IR Galaxy Catalogue