2004A&A...426...81P


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.03CET04:40:29

2004A&A...426...81P - Astronomy and Astrophysics, volume 426, 81-96 (2004/10-4)

Kinematic and structural analysis of the Minispiral in the Galactic Center from BEAR spectro-imagery.

PAUMARD T., MAILLARD J.-P. and MORRIS M.

Abstract (from CDS):

Integral field spectroscopy of the inner region of the Galactic Center, over a field of roughly 40"x40" was obtained at 2.06µm (HeI) and 2.16µm (Brγ) using BEAR, an imaging Fourier Transform Spectrometer, at spectral resolutions respectively of 52.9km/s and 21.3km/s, and a spatial resolution of ≃0.5". The analysis of the data was focused on the kinematics of the gas flows, traditionally called the ``Minispiral'', concentrated in the neighborhood of the central black hole, Sgr A*. From the decomposition into several velocity components (up to four) of the line profile extracted at each point of the field, velocity features were identified. Nine distinguishable structures are described: the standard Northern Arm, Eastern Arm, Bar, Western Arc, and five additional, coherently-moving patches of gas. From this analysis, the Northern Arm appears not limited, as usually thought, to the bright, narrow North-South lane seen on intensity images, but it consists instead of a weak, continuous, triangular-shaped surface, drawn out into a narrow stream in the vicinity of Sgr A* where it shows a strong velocity gradient, and a bright western rim. The Eastern Arm is split into three components (a Ribbon and a Tip, separated by a cavity, and an elongated feature parallel to the Ribbon: the Eastern Bridge). We also report extinction of some interstellar structures by other components, providing information on their relative position along the line of sight. A system of Keplerian orbits can be fitted to most of the Northern Arm, and the bright rim of this feature can be interpreted in terms of line-of-sight orbit crowding caused by the warping of the flowing surface at the western edge facing Sgr A*. These results lead to a new picture of the gas structures in Sgr A West, in which large-scale gas flows and isolated gas patches coexist in the gravitational field of the central Black Hole. The question of the origin of the ionized gas is addressed and a discussion of the lifetime of these features is presented.

Abstract Copyright:

Journal keyword(s): Galaxy: center - ISM: individual objects: Sgr A West - ISM: kinematics and dynamics - infrared: ISM - Instrumentation: interferometers - line: profiles

VizieR on-line data: <Available at CDS (J/A+A/426/81): fig7a.fit fig7aerr.fit fig7b.fit fig7berr.fit>

Nomenclature: Table 1: [PMM2004] Sgr A West a (Nos a-i).

Simbad objects: 45

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Number of rows : 45

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 [BSD96] 22 WR* 17 45 39.38 -29 00 33.4           WC8/9 27 0
2 NAME Sgr A West HII 17 45 39.4 -29 00 24           ~ 354 0
3 [BSD96] 29 WR* 17 45 39.46 -29 00 31.7           WN8 27 0
4 [BSD96] 33 WR* 17 45 39.54 -29 00 35.0           Ofpe/WN9 39 0
5 GAL 000.0+00.0 gam 17 45 39.60213 -29 00 22.0000           ~ 12003 0
6 GCIRS 13E Cl* 17 45 39.73 -29 00 29.7           WN9 102 0
7 GCIRS 34W WR* 17 45 39.73 -29 00 26.6           Ofpe/WN9 54 0
8 GCIRS 2 Em* 17 45 39.7540 -29 00 32.880           ~ 64 0
9 GCIRS 13 Em* 17 45 39.76 -29 00 29.8           ~ 131 0
10 GCIRS 13E2 WR* 17 45 39.8006 -29 00 29.819           WN8 40 0
11 GCIRS 7W WR* 17 45 39.86 -29 00 22.2           WC9 35 0
12 GCIRS 29N WR* 17 45 39.917 -29 00 26.71           WC9 53 0
13 GCIRS 15SW WR* 17 45 39.92 -29 00 18.1           WN8/WC9 35 0
14 GCIRS 7 * 17 45 39.987 -29 00 22.24           M2 350 0
15 GCIRS 16 Cl* 17 45 40.0 -29 00 28           ~ 316 0
16 NAME Galactic Circumnuclear Disk PoG 17 45 40.0 -29 00 28           ~ 117 0
17 GCIRS 33SE Em* 17 45 40.02 -29 00 31.0           Ofpe/WN9 24 0
18 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3600 3
19 GCIRS 16NW WR* 17 45 40.0451 -29 00 26.847           Ofpe/WN9 128 0
20 NAME Sgr A West Northern Arm PoG 17 45 40.1 -29 00 28           ~ 22 0
21 GCIRS 16C WR* 17 45 40.12 -29 00 27.6           Ofpe/WN9 168 1
22 GCIRS 16SW WR* 17 45 40.1245 -29 00 29.018           Ofpe/WN9 144 0
23 GCIRS 15NE WR* 17 45 40.15 -29 00 16.5           WN8/9 54 0
24 GCIRS 1 * 17 45 40.2 -29 00 27           ~ 66 0
25 GCIRS 9W WR* 17 45 40.26 -29 00 33.7           WN8 27 0
26 GCIRS 35W WR* 17 45 40.26 -29 00 29.3           WN5/6 41 0
27 GCIRS 16NE WR* 17 45 40.26 -29 00 27.2           Ofpe/WN9 142 0
28 [PMM2001] B9 WR* 17 45 40.2673 -29 00 24.628           WC9 15 1
29 GCIRS 1W Em* 17 45 40.442 -29 00 27.51           Be? 98 0
30 [OEG99] 180 WR* 17 45 40.76 -29 00 27.8           WC9 14 0
31 NAME Minicavity in Sgr A West reg ~ ~           ~ 3 1
32 NAME Finger in Sgr A West reg ~ ~           ~ 3 1
33 NAME Ribbon in Sgr A West reg ~ ~           ~ 1 0
34 NAME Eastern Arm in Sgr A West reg ~ ~           ~ 13 0
35 NAME Sgr A West Northern Arm Chunk reg ~ ~           ~ 2 0
36 NAME Bar in Sgr A West reg ~ ~           ~ 10 1
37 GCIRS 7E2 * ~ ~           ~ 13 0
38 NAME Microcavity in Sgr A West reg ~ ~           ~ 1 1
39 NAME Tip in Sgr A West reg ~ ~           ~ 2 0
40 NAME Bar 1 in Sgr A West reg ~ ~           ~ 2 1
41 NAME Bar Overlay in Sgr A West reg ~ ~           ~ 2 0
42 NAME Western Arc in Sgr A West reg ~ ~           ~ 11 0
43 NAME Bar 2 in Sgr A West reg ~ ~           ~ 2 1
44 NAME Western Bridge in Sgr A West reg ~ ~           ~ 2 0
45 NAME Eastern Bridge in Sgr A West reg ~ ~           ~ 3 0

    Equat.    Gal    SGal    Ecl

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2021.03.03-04:40:30

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