2024MNRAS.528..542K

Query : 2024MNRAS.528..542K

2024MNRAS.528..542K - Mon. Not. R. Astron. Soc., 528, 542-557 (2024/February-2)

H I galaxy signatures in the SARAO MeerKAT galactic plane survey - II. The Local Void and its substructure.

KURAPATI S., KRAAN-KORTEWEG R.C., PISANO D.J., CHEN H., RAJOHNSON S.H.A., STEYN N., FRANK B., SERRA P., GOEDHART S. and CAMILO F.

Abstract (from CDS):

The Local Void is one of the nearest large voids, located at a distance of 23 Mpc. It lies largely behind the Galactic Bulge and is therefore extremely difficult to observe. We use H I 21 cm emission observations from the SARAO MeerKAT Galactic Plane Survey (SMGPS) to study the Local Void and its surroundings over the Galactic longitude range 329° < ℓ < 55°, Galactic latitude |b| < 1.5°, and redshift cz < 7500 $\rm km \, s^{-1}$. We have detected 291 galaxies to median rms sensitivity of 0.44 mJy per beam per 44 $\rm km \, s^{-1}$ channel. We find 17 galaxies deep inside the Void, 96 at the border of the Void, while the remaining 178 galaxies are in average density environments. The extent of the Void is ∼58 Mpc. It is severely underdense for the longitude range 350° < ℓ < 35° up to redshift z < 4500 $\rm km \, s^{-1}$. The galaxies in the Void tend to have H I masses that are lower (by approximately 0.25 dex) than their average density counterparts. We find several potential candidates for small groups of galaxies, of which two groups (with 3 members and 5 members) in the Void show signs of filamentary substructure within the Void.

Abstract Copyright: © 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.

Journal keyword(s): galaxies: evolution - galaxies: ISM - catalogues - surveys - large-scale structure of Universe - radio lines: galaxies

Nomenclature: SMGPS-HI JHHMMSS+DDMMSS N=291. Figs 12-13, Table 3: [KKP2024] AN (Nos B1-B3, F1-F4, V1-V2), [KKP2024] AN a N=38.

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 39

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Number of rows : 39
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Psc-Per Supercluster SCG 02 33.2 +41 37           ~ 444 1
2 NAME Vela Supercluster SCG 10 53.0 +02 44           ~ 54 0
3 NAME Norma Supercluster ClG 12 49 -38.0           ~ 24 0
4 HIZOA J1603-53 G 16 03 19.4 -53 19 14           ~ 2 0
5 HIZOA J1605-51 G 16 05 37.0 -51 13 36           ~ 3 0
6 HIZOA J1607-53 G 16 07 32.1 -53 47 06           ~ 2 0
7 HIZOA J1607-51 G 16 07 38.9 -51 02 34           ~ 2 0
8 HIZOA J1609-50 G 16 09 41.9 -50 13 27           ~ 2 0
9 HIZOA J1612-52 G 16 12 48.5 -52 44 09           ~ 2 0
10 HIZOA J1617-49 G 16 17 45.8 -49 33 30           ~ 2 0
11 HIZOA J1626-47 G 16 26 42.0 -47 16 35           ~ 2 0
12 HIZOA J1627-47 G 16 27 07.6 -47 37 37           ~ 2 0
13 HIZOA J1640-45 G 16 40 49.1 -45 01 07           ~ 2 0
14 HIZOA J1653-44 G 16 53 27.7 -44 18 39           ~ 2 0
15 HIZOA J1656-44 G 16 56 42.6 -44 07 09           ~ 2 0
16 HIZOA J1657-45 G 16 57 43.8 -45 10 54           ~ 2 0
17 HIZOA J1704-41 G 17 04 28.9 -41 38 09           ~ 2 0
18 HIZOA J1705-40 G 17 05 09.4 -40 59 07           ~ 2 0
19 HIZOA J1713-40 G 17 13 09.6 -40 50 49           ~ 2 0
20 HIZOA J1716-35 G 17 16 41.8 -35 56 15           ~ 2 0
21 HIZOA J1719-37 G 17 19 11.0 -37 31 14           ~ 2 0
22 HIZOA J1721-37 G 17 21 26.0 -37 47 26           ~ 2 0
23 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
24 HIZOA J1753-24A G 17 53 13.0 -24 20 58           ~ 3 0
25 HIZOA J1758-21 G 17 58 33.0 -21 49 09           ~ 2 0
26 HIZOA J1808-21 G 18 08 14.3 -21 36 36           ~ 2 0
27 HIZOA J1811-21 G 18 11 09.6 -21 31 36           ~ 2 0
28 NAME Local Void vid 18 38 +18.0           ~ 234 0
29 ALFA ZOA J1901+0651 G 19 01 35.4 +06 52 00           ~ 8 0
30 HIZOA J1904+03A G 19 04 15 +03 06.8           ~ 2 0
31 HIZOA J1906+07 G 19 06 53 +07 33.9           ~ 4 0
32 HIZOA J1908+05 G 19 08 26 +05 59.6           ~ 3 0
33 ALFA ZOA J1912+1323 G 19 12 37.3 +13 23 54           ~ 6 0
34 ALFA ZOA J1914+1017 G 19 14 58.4 +10 17 37           ~ 9 0
35 HIZOA J1918+16 G 19 18 38 +16 10.2           ~ 2 0
36 ALFA ZOA J1919+1405 G 19 19 59 +14 04.0           ~ 3 0
37 ALFA ZOA J1921+1453 G 19 21 35.8 +14 54 15           ~ 6 0
38 NAME Norma Wall reg ~ ~           ~ 15 0
39 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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