2016AJ....151...55V


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.19CEST18:42:01

2016AJ....151...55V - Astron. J., 151, 55 (2016/March-0)

The start of the Sagittarius spiral arm (Sagittarius origin) and the start of the Norma spiral arm (Norma origin): model-computed and observed arm tangents at galactic longitudes -20° < l < +23°.

VALLEE J.P.

Abstract (from CDS):

Here, we fitted a four-arm spiral model to the more accurate data on global arm pitch angle and arm longitude tangents to get the start of each spiral arm near the galactic nucleus. We find that the tangent to the ''start of the Sagittarius'' spiral arm (arm middle) is at l = -17°±0.°5, while the tangent to the ''start of the Norma'' spiral arm (arm middle) is at l = +20°±0.°5. Earlier, we published a compilation of observations and analysis of the tangent to each spiral arm tracer from longitudes +23° to +340°; in this paper we cover the arm tracers in the remaining longitudes +340 (=-20°) to +23°. Our model arm tangents are confirmed through the recent observed masers data (at the arm's inner edge). Observed arm tracers in the inner Galaxy show an offset from the mid arm; this was also found elsewhere in the Milky Way disk. In addition, we collated the observed tangents to the so-called 3 kpc arm features; statistically they are found to be near l = -18°±2° and near l = +21°±2°, after excluding misidentified spiral arms. We find that the model-computed arm tangents in the inner Galaxy are spatially coincident with the mean longitude of the observed tangents to the 3 kpc arm features (same galactic longitudes, within the errors). These spatial similarities may be suggestive of a contiguous space.

Abstract Copyright:

Journal keyword(s): galaxies: spiral - Galaxy: disk - Galaxy: structure - ISM: general - ISM: structure - methods: statistical

Simbad objects: 16

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Number of rows : 16

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 74 G 01 36 41.772 +15 47 00.46 10.52 10.00 9.46 9.16   ~ 1428 1
2 NGC 1232 EmG 03 09 45.514 -20 34 45.48   10.67 9.87 9.53 10.2 ~ 266 0
3 NAME Per Arm PoG 03 30 +45.0           ~ 1275 0
4 NGC 2217 LIN 06 21 39.7510916579 -27 14 01.656348959   11.04 11.93 9.78 10.5 ~ 152 0
5 NAME Car Arm PoG 10 00 -60.0           ~ 382 1
6 NGC 3180 GiG 10 18 16.985 +41 25 27.77   10.4       ~ 638 0
7 M 109 GiG 11 57 35.984 +53 22 28.27   10.94   9.57   ~ 420 0
8 NAME Crux Arm PoG 12 30 -60.0           ~ 84 0
9 NGC 4593 Sy1 12 39 39.4435521178 -05 20 39.035028119   13.95 13.15     ~ 959 0
10 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3832 4
11 NAME Nor Arm PoG 16 00 -50.0           ~ 345 0
12 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11753 0
13 NAME Sgr Arm PoG 19 00 -30.0           ~ 529 1
14 NAME Centaurus Arm PoG ~ ~           ~ 73 0
15 NAME Scutum Spiral Arm PoG ~ ~           ~ 280 0
16 NAME Galactic Bar reg ~ ~           ~ 918 0

    Equat.    Gal    SGal    Ecl

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2020.10.19-18:42:01

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