2020MNRAS.498.5863D

Query : 2020MNRAS.498.5863D

2020MNRAS.498.5863D - Mon. Not. R. Astron. Soc., 498, 5863-5872 (2020/November-2)

Constraining the distance to the North Polar Spur with Gaia DR2.

DAS K.K., ZUCKER C., SPEAGLE J.S., GOODMAN A., GREEN G.M. and ALVES J.

Abstract (from CDS):

The North Polar Spur (NPS) is one of the largest structures observed in the Milky Way in both the radio and soft X-rays. While several predictions have been made regarding the origin of the NPS, modelling the structure is difficult without precise distance constraints. In this paper, we determine accurate distances to the southern terminus of the NPS and towards latitudes ranging up to 55°. First, we fit for the distance and extinction to stars towards the NPS using optical and near-infrared photometry and Gaia Data Release 2 astrometry. We model these per-star distance-extinction estimates as being caused by dust screens at unknown distances, which we fit for using a nested sampling algorithm. We then compare the extinction to the Spur derived from our 3D dust modelling with integrated independent measures from XMM-Newton X-ray absorption and H I column density measures. We find that we can account for nearly 100 per cent of the total column density of the NPS as lying within 140 pc for latitudes >26° and within 700 pc for latitudes <11°. Based on the results, we conclude that the NPS is not associated with the Galactic Centre or the Fermi bubbles. Instead, it is likely associated, especially at higher latitudes, with the Scorpius-Centaurus association.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): methods: statistical - ISM: dust, extinction - Galaxy: structure - radio continuum: ISM

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

Simbad objects: 22

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Number of rows : 22
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 Cha 1 MoC 11 06 48 -77 18.0           ~ 1266 1
2 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 887 0
3 NAME North Polar Spur ISM 12 00 +00.0           ~ 405 1
4 NAME Lower Centaurus Crux As* 12 19 -57.1           ~ 565 1
5 NAME Coalsack Nebula DNe 12 31 19 -63 44.6           ~ 275 0
6 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1274 0
7 NAME Cha II MoC 12 54 -77.2           ~ 361 0
8 NAME Loop I SR? 15 01 -38.7           ~ 414 2
9 Lupus 1 Cld 15 43 02.1 -34 09 06           ~ 320 0
10 Lupus 2 MoC 15 57 08 -37 47.1           ~ 119 1
11 NAME Lupus Complex SFR 16 03 -38.1           ~ 851 0
12 Lupus 4 MoC 16 03 12.4 -42 07 43           ~ 163 0
13 Lupus 3 SFR 16 09.6 -39 03           ~ 348 0
14 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1497 1
15 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1
16 LDN 1746 DNe 17 11.3 -27 22           ~ 157 0
17 NAME Fermi Bubbles bub 17 45 -29.0           ~ 525 0
18 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
19 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 1195 1
20 NAME Aql Rift DNe 18 32 -01.0           ~ 355 1
21 NAME Corona Australis Cloud MoC 19 01 51 -36 58.9           ~ 554 0
22 NAME Local Bubble ISM ~ ~           ~ 1059 0

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