2014MNRAS.442.2993V

Query : 2014MNRAS.442.2993V

2014MNRAS.442.2993V - Mon. Not. R. Astron. Soc., 442, 2993-2998 (2014/August-3)

On a persistent large discrepancy in some parameters of the spiral arms in the Milky Way - a statistical and modelling analysis.

VALLEE J.P.

Abstract (from CDS):

Although the average over time of the arm parameters (arm shape, pitch angle, number of arms, interarm separation) shows constant values, this work investigates why some arm parameters (number of arms, pitch angle) have large discrepancies that are not decreasing with time, despite more and better observational data. Using statistics, we find several instances of poor or no comparisons with a four-arm galactic structure. Using modelling, we confirm that a two-arm galactic structure and a small pitch angle predict too many unseen spiral arm tangents.

Abstract Copyright: © 2014 The Author Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): Galaxy: disc - Galaxy: structure - galaxies: ISM

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 1024 2
2 NAME Per Arm PoG 03 30 +45.0           ~ 1513 0
3 NAME Car Arm PoG 10 00 -60.0           ~ 439 1
4 NAME Crux Arm PoG 12 30 -60.0           ~ 88 0
5 NAME Car-Sgr Arm PoG 15 00 -40.0           ~ 514 1
6 NAME Nor Arm PoG 16 00 -50.0           ~ 430 0
7 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14398 0
8 SNR G030.8-00.0 SNR 18 47 32 -01 56.5           ~ 531 0
9 NAME Sgr Arm PoG 19 00 -30.0           ~ 637 1
10 NAME Scutum Spiral Arm PoG ~ ~           ~ 351 0
11 NAME Galactic Bar reg ~ ~           ~ 1216 0

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