1999AJ....118..777E

Query : 1999AJ....118..777E

1999AJ....118..777E - Astron. J., 118, 777-784 (1999/August-0)

Near-infrared observations of hot spots in the circumnuclear rings of NGC 2997 and NGC 6951.

ELMEGREEN D.M., CHROMEY F.R., SAWYER J.E. and REINFELD E.L.

Abstract (from CDS):

Near-infrared observations of NGC 2997 and NGC 6951 reveal complete rings of symmetrically placed hot spots, which are star-forming complexes. The masses of the complexes range from a few times 104 to a few times 105 M☉ in both galaxies. The regular hot-spot spacings of about 200 pc in a ring 55 pc thick in NGC 2997 and 380 pc in a ring 150 pc thick in NGC 6951 are consistent with formation by a large-scale gravitational instability in the rings. Visual extinction is estimated to be up to 3 mag around the ring in NGC 2997 and up to 5 mag in NGC 6951, as dust lanes spiral in and cross the ring. Hubble Space Telescope observations reveal smaller super-star clusters within the large complexes. These clusters have power-law luminosity functions with an exponent of approximately -2 in both galaxy rings, the same as for star-forming complexes in the disks of normal spiral galaxies.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Individual: NGC Number: NGC 2997 - Galaxies: Individual: NGC Number: NGC 6951 - Galaxies: Luminosity Function, Mass Function - Galaxies: Starburst - Galaxies: Star Clusters

Nomenclature: Table 1: [ECS99] NGC 2997 Na (Nos 1-9, 2a, 7a), [ECS99] NGC 6951 N (Nos 1-8).

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 - 2026 		#notes
1 NGC 1097 LIN 02 46 19.059 -30 16 29.68 10.46 9.97 9.48 8.72 9.8 ~ 1448 3
2 NGC 1569 rG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1297 3
3 NGC 1705 Sy2 04 54 13.4661493464 -53 21 39.471592428 12.32 12.96 12.56 12.58 12.9 ~ 692 1
4 NGC 2207 AG? 06 16 22.0336889136 -21 22 21.759218400   11.48 10.65 10.21 11.9 ~ 301 4
5 NGC 2997 GiG 09 45 38.7542237472 -31 11 27.345810192   9.97 9.41 8.84 9.9 ~ 454 1
6 M 95 GiP 10 43 57.7313485800 +11 42 13.301191332 10.71 10.51 9.73 9.48   ~ 1238 2
7 NGC 4314 LIN 12 22 32.0223000912 +29 53 43.814812200 11.72 11.43 10.58     ~ 494 1
8 M 100 AGN 12 22 54.9299993592 +15 49 20.296257960 10.04 10.05 9.35     ~ 1963 2
9 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2778 2
10 NGC 5248 G 13 37 32.0145074088 +08 53 06.496982448   11.4       ~ 554 0
11 NGC 6951 Sy2 20 37 14.1228088488 +66 06 20.049916392   11.64 10.65     ~ 553 2

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