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26 April 2024 |
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The Arecibo L-band Feed Array Zone of Avoidance (ALFAZOA) Shallow Survey | | Monica Sanchez-Barrantes
; Patricia A. Henning
; Travis McIntyre
; Emmanuel Momjian
; Robert Minchin
; Jessica L. Rosenberg
; Stephen Schneider
; Lister Staveley-Smith
; Wim van Driel
; Mpati Ramatsoku
; Zhon Butcher
; Ensieh Vaez
; | | Date: |
12 Oct 2019 | | Abstract: | The Arecibo L-band Feed Array Zone of Avoidance (ALFAZOA) Shallow Survey is a
blind HI survey of the extragalactic sky behind the northern Milky Way
conducted with the ALFA receiver on the 305m Arecibo Radio Telescope. ALFAZOA
Shallow covered 900 square degrees at full sensitivity from 30{deg} ${leq} l
{leq} $75{deg} and |b|$ {leq}$ 10{deg} and an additional 460 square degrees
at limited sensitivity at latitudes up to 20{deg}. It has an rms sensitivity
of 5-7 mJy and a velocity resolution of 9 - 20.6 km s$^{-1}$, and detected 403
galaxies out to a recessional velocity of 12,000 km s$^{-1}$, with an angular
resolution of 3.4’ and a positional accuracy between 0.2’ and 1.7’. The survey
is complete above an integrated line flux $F_{HI}$ = 2.0 Jy km s$^{-1}$ for
half the survey, and above $F_{HI}$ = 2.8 Jy km s$^{-1}$ for the other half.
Forty-three percent of the ALFAZOA HI detections have at least one possible
optical/NIR counterpart in the literature, and an additional 16% have
counterparts that only included previous HI measurements. There are fewer
counterparts in regions of high extinction and for galaxies with lower HI mass.
Comparing the results of the survey to the predictions of Erdogdu et al.
(2006), and using their nomenclature, ALFAZOA confirms the position and extent
in the ZOA of the C7, C${zeta}$, Pegasus, Corona Borealis and Delphinus
structures, but not of the Cygnus void. Two new structures are identified, both
connected to the C7 overdensity; one extends to 35{deg}, and the other crosses
the ZOA. | | Source: | arXiv, 1910.5431 | | Services: | Forum | Review | PDF | Favorites | |
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