2017A&A...603A..68M


Query : 2017A&A...603A..68M

2017A&A...603A..68M - Astronomy and Astrophysics, volume 603A, 68-68 (2017/7-1)

Approaching hell's kitchen: Molecular daredevil clouds in the vicinity of Sagittarius A*.

MOSER L., SANCHEZ-MONGE A., ECKART A., REQUENA-TORRES M.A., GARCIA-MARIN M., KUNNERIATH D., ZENSUS A., BRITZEN S., SABHA N., SHAHZAMANIAN B., BORKAR A. and FISCHER S.

Abstract (from CDS):

We report serendipitous detections of line emission with the Atacama Large Millimeter/submillimeter Array (ALMA) in bands 3, 6, and 7 in the central parsec down to within 1'' around Sgr A* at an up to now highest resolution (<0.5'') view of the Galactic center (GC) in the submillimeter (sub-mm) domain. From the 100GHz continuum and the H39α emission we obtain a uniform electron temperature around Te∼6000K for the minispiral. The spectral index (S∝να) of Sagittarius A* (Sgr A*) is ∼0.5 at 100-250GHz and ∼0.0 at 230-340GHz. The bright sources in the center show spectral indices around -0.1 implying Bremsstrahlung emission, while dust emission is emerging in the minispiral exterior. Apart from CS, which is most widespread in the center, H13CO+, HC3N, SiO, SO, C2H, CH3OH, 13CS and N2H+ are also detected. The bulk of the clumpy emission regions is at positive velocities and in a region confined by the minispiral northern arm (NA), bar, and the sources IRS 3 and 7. Although partly spatially overlapping with the radio recombination line (RRL) emission at same negative velocities, the relation to the minispiral remains unclear. A likely explanation is an infalling clump consisting of denser cloud cores embedded in diffuse gas. This central association (CA) of clouds shows three times higher CS/X (X: any other observed molecule) ratios than the circumnuclear disk (CND) suggesting a combination of higher excitation, by a temperature gradient and/or infrared (IR) pumping, and abundance enhancement due to UV and/or X-ray emission. Hence, we conclude that this CA is closer to the center than the CND is to the center. Moreover, we find molecular line emission at velocities up to 200km/s. Apart from the CA, we identified two intriguing regions in the CND. One region shows emission in all molecular species and higher energy levels tested in this and previous observations and contains a methanol class I maser. The other region shows similar behavior of the line ratios such as the CA. Outside the CND, we find the traditionally quiescent gas tracer N2H+ coinciding with the largest IR dark clouds in the field. Methanol emission is found at and around previously detected methanol class I masers in the same region. We propose to make these particular regions subject to further studies in the scope of hot core, cold core, and extreme photon and/or X-ray dominated region (PDR/XDR) chemistry and consequent star formation in the central few parsecs.

Abstract Copyright: © ESO, 2017

Journal keyword(s): Galaxy: center - Galaxy: nucleus - submillimeter: ISM - ISM: molecules - ISM: clouds - ISM: kinematics and dynamics - ISM: kinematics and dynamics

VizieR on-line data: <Available at CDS (J/A+A/603/A68): list.dat fits/*>

CDS comments: Not all objects in SIMBAD.

Simbad objects: 92

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Number of rows : 92
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 [MES2007] NE1 ? 07 45 35.280 -29 00 24.70           ~ 2 0
2 IRAS 08375-4109 HII 08 39 20.4 -41 19 53           ~ 15 0
3 GCM -0.13 -0.08 MoC 17 45 25.2 -29 05 30           ~ 118 1
4 [MES2007] SW3 ? 17 45 33.961 -29 00 27.35           ~ 2 0
5 [MES2007] SW4 ? 17 45 34.971 -29 00 29.88           ~ 2 0
6 [MES2007] SW5 ? 17 45 36.041 -29 00 25.61           ~ 2 0
7 [MES2007] SW7 ? 17 45 36.971 -29 00 23.02           ~ 3 0
8 GCIRS 6W * 17 45 39.38 -29 00 26.2           ~ 15 0
9 NAME Sgr A West HII 17 45 39.4 -29 00 24           ~ 363 0
10 GCIRS 6 * 17 45 39.5 -29 00 27           ~ 36 0
11 [YRW2013] 11 out 17 45 39.510 -29 00 36.96           ~ 2 0
12 GCIRS 12 IR 17 45 39.6 -29 00 35           ~ 29 0
13 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12565 0
14 GCIRS 6E WR* 17 45 39.632 -29 00 27.05           Ofpe/WN9 60 0
15 GCIRS 2S * 17 45 39.69 -29 00 32.5           ~ 16 0
16 GCIRS 13E Cl* 17 45 39.73 -29 00 29.7           WN9 109 0
17 GCIRS 34W WR* 17 45 39.73 -29 00 26.6           Ofpe/WN9 55 0
18 GCIRS 7SW WR* 17 45 39.74 -29 00 23.3           WN8 15 0
19 GCIRS 34NW WR* 17 45 39.749 -29 00 25.36           WN7 19 0
20 GCIRS 2 Em* 17 45 39.7540 -29 00 32.880           ~ 65 0
21 GCIRS 34E s*b 17 45 39.7626 -29 00 26.274           O9/9.5I 6 1
22 GCIRS 2L * 17 45 39.778 -29 00 32.11           ~ 22 0
23 GCIRS 13W * 17 45 39.78 -29 00 30.5           M0III 19 0
24 GCIRS 3 * 17 45 39.80 -29 00 23.9           ~ 142 0
25 GCIRS 13E3c IR 17 45 39.808 -29 00 29.48           ~ 10 1
26 GCIRS 13N * 17 45 39.812 -29 00 29.16           ~ 36 0
27 GCIRS 13NE IR 17 45 39.835 -29 00 29.66           ~ 4 0
28 [MES2007] X3 * 17 45 39.8478 -29 00 30.445           ~ 15 0
29 GCIRS 12N * 17 45 39.86 -29 00 35.7           M0III 55 0
30 GCIRS 3E WR* 17 45 39.869 -29 00 24.32           WC5/6 17 0
31 GCIRS 29N WR* 17 45 39.917 -29 00 26.71           WC9 54 0
32 GCIRS 29 IR 17 45 39.919 -29 00 26.86           ~ 26 0
33 [VES2006] 60 IR 17 45 39.926 -29 00 28.81           ~ 2 0
34 GCIRS 33SW * 17 45 39.94 -29 00 31.0           ~ 8 0
35 GCIRS 29NE1 WR* 17 45 39.9643 -29 00 26.021           WC8/9 33 0
36 GCIRS 33NW IR 17 45 39.983 -29 00 29.91           ~ 4 0
37 GCIRS 7 * 17 45 39.987 -29 00 22.24           M2 354 0
38 [MES2007] SW1 ? 17 45 40.0 -29 00 28           ~ 2 0
39 [MES2007] NE2 ? 17 45 40.0 -29 00 28           ~ 2 0
40 NAME Galactic Circumnuclear Disk PoG 17 45 40.0 -29 00 28           ~ 133 0
41 [MES2007] X2 ? 17 45 40.0 -29 00 28           ~ 2 0
42 [MES2007] X6 ? 17 45 40.0 -29 00 28           ~ 2 0
43 [MES2007] SW2 ? 17 45 40.0 -29 00 28           ~ 2 0
44 [MES2007] SW6 ? 17 45 40.0 -29 00 28           ~ 2 0
45 [MES2007] X5 ? 17 45 40.0 -29 00 28           ~ 2 0
46 GCIRS 16 Cl* 17 45 40.0 -29 00 28           ~ 327 0
47 [MES2007] SW8 ? 17 45 40.0 -29 00 28           ~ 2 0
48 GCIRS 20 * 17 45 40.01 -29 00 33.9           M7III 20 0
49 GCIRS 33SE Em* 17 45 40.02 -29 00 31.0           Ofpe/WN9 24 0
50 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3770 3
51 GCIRS 33N s*b 17 45 40.0381 -29 00 30.302           B0.5/1I 37 0
52 GCIRS 16NW WR* 17 45 40.0451 -29 00 26.847           Ofpe/WN9 129 0
53 GCIRS 14NE * 17 45 40.078 -29 00 36.62           M7III 17 0
54 GCIRS 16S WR* 17 45 40.09 -29 00 29.8           ~ 11 0
55 GCIRS 33E WR* 17 45 40.0941 -29 00 31.213           Ofpe/WN9 53 0
56 GCIRS 16SSW s*b 17 45 40.0967 -29 00 29.711           O8/9.5I 16 0
57 GCIRS 16C WR* 17 45 40.12 -29 00 27.6           Ofpe/WN9 173 1
58 GCIRS 16SW WR* 17 45 40.1245 -29 00 29.018           Ofpe/WN9 148 0
59 GCIRS 8 * 17 45 40.14 -28 59 58.7           O 72 0
60 GCIRS 16SE1 WR* 17 45 40.181 -29 00 29.26           WC8/9 42 0
61 GCIRS 16CC s*b 17 45 40.1939 -29 00 27.532           O9.5/B0.5I 51 0
62 GCIRS 1 * 17 45 40.2 -29 00 27           ~ 66 0
63 GCIRS 21 WR* 17 45 40.222 -29 00 30.85           WC9 96 0
64 GCIRS 9W WR* 17 45 40.26 -29 00 33.7           WN8 29 0
65 GCIRS 35W WR* 17 45 40.26 -29 00 29.3           WN5/6 43 0
66 GCIRS 16NE WR* 17 45 40.26 -29 00 27.2           Ofpe/WN9 144 0
67 GCIRS 16SE3 s*b 17 45 40.2963 -29 00 29.238           O8.5/9.5I 5 0
68 GCIRS 9SW WR* 17 45 40.3689 -29 00 36.154           WC9 10 0
69 GCIRS 10 * 17 45 40.4 -29 00 24           ~ 34 0
70 GCIRS 1W Em* 17 45 40.442 -29 00 27.51           Be? 100 0
71 GCIRS 9 LP* 17 45 40.447 -29 00 34.49           M3III 101 0
72 GCIRS 9SE WR* 17 45 40.4723 -29 00 36.299           WC9 12 0
73 [YRW2013] 1 out 17 45 40.510 -29 00 28.78           ~ 2 0
74 GCIRS 1E s*b 17 45 40.5268 -29 00 27.863           B1/3I 14 0
75 GCIRS 10W * 17 45 40.5305 -29 00 23.001           ~ 46 0
76 [MES2007] NE4 ? 17 45 40.5410 -29 00 26.488           ~ 3 0
77 [TVH89] 179 OH* 17 45 40.63 -29 00 23.5           ~ 58 0
78 GCIRS 5 * 17 45 40.700 -29 00 18.51           ~ 55 0
79 GCIRS 5S IR 17 45 40.738 -29 00 20.31           ~ 4 0
80 [YRW2013] 2 out 17 45 40.740 -29 00 26.11           ~ 2 0
81 GCIRS 4 * 17 45 40.837 -29 00 34.16           ~ 21 0
82 GCIRS 5SE1 IR 17 45 40.856 -29 00 21.36           ~ 6 0
83 GCIRS 5E IR 17 45 40.875 -29 00 18.96           ~ 6 0
84 GCIRS 5SE2 IR 17 45 40.887 -29 00 21.56           ~ 4 0
85 NAME Sgr A East Rad 17 45 41 -29 00.8           ~ 467 2
86 GCIRS 17 * 17 45 41.0377 -29 00 22.611           ~ 31 0
87 [MES2007] NE3 ? 17 45 42.6600 -29 00 28.028           ~ 3 0
88 [MES2007] X1 ? 17 45 43.261 -29 00 31.52           ~ 4 0
89 GCIRS 29NE * 17 45 43.77 -29 00 27.4           ~ 6 0
90 GCM -0.02 -0.07 MoC 17 45 50.4 -28 59 06           ~ 155 0
91 GCIRS 7E2 * ~ ~           ~ 13 0
92 GCIRS 33 IR ~ ~           ~ 10 0

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2021.12.07-23:43:53

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