2011ApJ...735L..33M

Query : 2011ApJ...735L..33M

2011ApJ...735L..33M - Astrophys. J., 735, L33 (2011/July-2)

A 100 pc elliptical and twisted ring of cold and dense molecular clouds revealed by Herschel around the Galactic Center.

MOLINARI S., BALLY J., NORIEGA-CRESPO A., COMPIEGNE M., BERNARD J.P., PARADIS D., MARTIN P., TESTI L., BARLOW M., MOORE T., PLUME R., SWINYARD B., ZAVAGNO A., CALZOLETTI L., DI GIORGIO A.M., ELIA D., FAUSTINI F., NATOLI P., PESTALOZZI M., PEZZUTO S., PIACENTINI F., POLENTA G., POLYCHRONI D., SCHISANO E., TRAFICANTE A., VENEZIANI M., BATTERSBY C., BURTON M., CAREY S., FUKUI Y., LI J.Z., LORD S.D., MORGAN L., MOTTE F., SCHULLER F., STRINGFELLOW G.S., TAN J.C., THOMPSON M.A., WARD-THOMPSON D., WHITE G. and UMANA G.

Abstract (from CDS):

Thermal images of cold dust in the Central Molecular Zone of the Milky Way, obtained with the far-infrared cameras on board the Herschel satellite, reveal a ∼3x107 M☉ ring of dense and cold clouds orbiting the Galactic center. Using a simple toy model, an elliptical shape having semi-major axes of 100 and 60 pc is deduced. The major axis of this 100 pc ring is inclined by about 40° with respect to the plane of the sky and is oriented perpendicular to the major axes of the Galactic Bar. The 100 pc ring appears to trace the system of stable x2 orbits predicted for the barred Galactic potential. Sgr A{sstarf} is displaced with respect to the geometrical center of symmetry of the ring. The ring is twisted and its morphology suggests a flattening ratio of 2 for the Galactic potential, which is in good agreement with the bulge flattening ratio derived from the 2MASS data.

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Journal keyword(s): Galaxy: center - ISM: clouds - stars: formation

Simbad objects: 9

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Number of rows : 9
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 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2582 2
2 NAME Sgr C MoC 17 44 36.3 -29 28 13           ~ 355 0
3 NAME Sgr A Region reg 17 45 12 -28 48.3           ~ 939 0
4 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14469 0
5 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4403 3
6 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 739 0
7 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 527 0
8 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2272 1
9 NAME Galactic Bar reg ~ ~           ~ 1224 0

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