1998AJ....115.2320R

Query : 1998AJ....115.2320R

1998AJ....115.2320R - Astron. J., 115, 2320-2330 (1998/June-0)

Massive star formation in the infrared-bright galaxy NGC 972.

RAVINDRANATH S. and PRABHU T.P.

Abstract (from CDS):

We present the results of optical broadband and Hα imaging studies of the infrared-bright galaxy NGC 972. The broadband images and B/R color map reveal the peculiar morphology and complex dust distribution. Massive star formation activity in this galaxy is evident from the continuum-subtracted Hα image, which shows the presence of circumnuclear activity and disk star formation within a radius of 3.4 kpc. The circumnuclear star-forming regions are distributed in a ring of radius 630 pc and closely associated with an inner dust ring. Aperture photometry has been performed on the individual H II regions, and we estimate an age ≤5.4 Myr for the nuclear starburst using evolutionary synthesis models. The Hα luminosity of the nucleus is comparable to that of starburst nuclei. The emission-line ratios of NGC 972 are also indicative of a nuclear starburst, which is powered by photoionization by a large number of hot, massive stars. The enhancement of low-ionization lines compared with normal H II regions can be attributed to the influence of dust on the thermal properties of the nebula or to contributions by shocks from supernova remnants. The star formation rate is estimated as 0.32 M☉.yr–1 for the nucleus and 2.1-2.7 M☉.yr–1 in the inner 3.6 kpc of the galaxy.

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Journal keyword(s): Galaxies: Individual: NGC Number: NGC 972 - Galaxies: Starburst - ISM: H II Regions - Stars: Formation

Nomenclature: Table 3: [RP98c] kNN (Nos k1-k18)

Simbad objects: 27

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Number of rows : 27
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 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3588 2
2 PG 0231+051 WD* 02 33 41.3574299856 +05 18 43.649856216 14.562 15.776 16.096 16.267 16.639 DAO.6 149 0
3 [RP98c] k17 HII 02 34 12.33 +29 19 03.7           ~ 1 0
4 [RP98c] k18 HII 02 34 12.45 +29 19 09.1           ~ 1 0
5 [RP98c] k16 HII 02 34 12.55 +29 18 56.7           ~ 1 0
6 [RP98c] k13 HII 02 34 12.98 +29 18 45.6           ~ 1 0
7 [RP98c] k5 HII 02 34 13.00 +29 18 31.2           ~ 1 0
8 [RP98c] k12 HII 02 34 13.20 +29 18 39.9           ~ 1 0
9 [RP98c] k14 HII 02 34 13.27 +29 18 48.9           ~ 1 0
10 [RP98c] k11 HII 02 34 13.30 +29 18 36.7           ~ 1 0
11 [RP98c] k15 HII 02 34 13.32 +29 18 59.2           ~ 1 0
12 NGC 972 G 02 34 13.3574389680 +29 18 40.604917356   12.1 13.63     ~ 178 2
13 [RP98c] k2 HII 02 34 13.39 +29 18 24.2           ~ 1 0
14 [RP98c] k10 HII 02 34 13.52 +29 18 42.4           ~ 1 0
15 [RP98c] k1 HII 02 34 13.58 +29 18 19.2           ~ 1 0
16 [RP98c] k9 HII 02 34 13.62 +29 18 48.0           ~ 1 0
17 [RP98c] k8 HII 02 34 13.95 +29 18 50.2           ~ 1 0
18 [RP98c] k3 HII 02 34 14.08 +29 18 21.3           ~ 1 0
19 [RP98c] k6 HII 02 34 14.13 +29 18 37.2           ~ 1 0
20 [RP98c] k4 HII 02 34 14.21 +29 18 29.6           ~ 1 0
21 [RP98c] k7 HII 02 34 14.35 +29 18 44.2           ~ 1 0
22 PG 0310+149 HS* 03 13 37.1755354608 +15 06 21.265349004   15.36       sdO 22 0
23 NGC 1808 Sy2 05 07 42.343 -37 30 46.98 11.05 10.80 9.94 9.36 10.2 ~ 756 3
24 NAME 30 Dor Nebula SFR 05 38 36.0 -69 05 11           ~ 1276 2
25 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 6156 6
26 NGC 7552 Sy1 23 16 10.66 -42 35 04.7 11.34 11.22 10.57 10.08 11.1 ~ 574 3
27 NAME Jumbo in NGC 3310 HII ~ ~           ~ 4 0

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