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26 April 2024 |
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Extragalactic large-scale structures in the northern Zone of Avoidance | | M Ramatsoku
; R C Kraan-Korteweg
; A C Schröder
; W van Driel
; | | Date: |
17 Dec 2014 | | Abstract: | We used the Nanc{c}ay Radio Telescope (NRT) to measure the 21 cm line
emission of near-infrared bright galaxies in the northern Zone of Avoidance
(ZoA) without previous redshift determinations. We selected galaxies with
extinction-corrected magnitudes $K_s^o leq 11hbox{$.!!^{
m m}$}25$ from
the 2MASS Extended Source Catalog. These data will complement the existing
2MASS Redshift Survey (2MRS; first data release) as well as the ongoing 2MASS
Tully-Fisher survey, both of which exclude the inner ZoA ($|b|< 5^{circ}$),
where the identification of galaxy candidates is the hardest. Of the $sim$1000
identified 2MASX galaxy candidates we have so far detected 252 to our 3.0 mJy
rms sensitivity limit and the velocity limit of 10500 km/s. The resulting
redshift distribution reveals various new structures that were hitherto
uncharted. They seem to form part of the larger Perseus-Pisces Supercluster
(PPS). The most conspicuous is a ridge at about $ellapprox 160^{circ}$,$v
approx 6500$ km/s. Within this wall-like structure, two strong radio galaxies
(3C 129 and 3C 129.1) are embedded which lie at the same distance as the ridge.
They seem to form part of an X-ray cluster. Another prominent filament has been
identified crossing the ZoA at $ell approx 90^circ$, hence suggesting the
second Perseus-Pisces arm is more extended than previously thought. | | Source: | arXiv, 1412.5324 | | Services: | Forum | Review | PDF | Favorites | |
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