2000AJ....120.2415I

Query : 2000AJ....120.2415I

2000AJ....120.2415I - Astron. J., 120, 2415-2422 (2000/November-0)

Star formation efficiency in the central 1 kiloparsec region of early-type spiral galaxies.

INOUE A.K., HIRASHITA H. and KAMAYA H.

Abstract (from CDS):

It has been reported recently that there are some early-type spiral (Sa-Sab) galaxies with evident star-forming regions that concentrate in their own central 1 kpc. In such central region, is the mechanism of the star formation distinct from that in disks of spiral galaxies? To discover this, we estimate the star formation efficiency (SFE) in this central 1 kpc star-forming region of some early-type spiral galaxies, taking account of the condition required for this 1 kpc region to be self-gravitating. Using two indicators of the present star formation rate (Hα and infrared luminosity), we estimate the SFE to a few percent. This is equivalent to the observational SFE in the disks of late-type spiral (Sb-) galaxies. This coincidence may support the universality of the mean SFE of spiral galaxies reported in the recent studies, that is, we find no evidence of a distinct mechanism of the star formation in the central 1 kpc region of early-type galaxies. Also, we examine the structure of the central star-forming region and discuss a method for estimating the mass of star-forming regions.

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Journal keyword(s): Galaxies: Spiral - Galaxies: Starburst - Galaxies: Structure - ISM: Structure - Stars: Formation

Simbad objects: 18

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Number of rows : 18
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 595 HII 01 33 33.53 +30 41 29.8           ~ 213 0
2 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
3 NGC 604 HII 01 34 32.1 +30 47 01           ~ 608 0
4 NGC 681 Sy2 01 49 10.8143098656 -10 25 34.813193736   12.5   11.30 12.1 ~ 148 0
5 NGC 1022 GiG 02 38 32.703 -06 40 38.60 12.33 12.09 11.34     ~ 213 1
6 NGC 2782 Sy2 09 14 05.11967 +40 06 49.6800 12.29 12.30 11.63     ~ 494 3
7 NGC 2993 Sy1 09 45 48.325 -14 22 06.02 12.72 13.11 12.64 13.4 13.0 ~ 194 2
8 NGC 3442 H2G 10 53 08.0999856384 +33 54 37.298426436   13.2       ~ 96 1
9 NGC 3504 LIN 11 03 11.19147 +27 58 20.7660   13.48 12.93     ~ 545 2
10 NGC 3611 GiG 11 17 30.15747 +04 33 19.5440   12.4       ~ 133 1
11 NGC 3729 GiP 11 33 49.321 +53 07 31.79   12.2       ~ 221 1
12 NGC 4045 AGN 12 02 42.2505701136 +01 58 36.362990064   13.144   16.938 12.1 ~ 209 1
13 NGC 4369 AGN 12 24 36.204 +39 22 58.73   12.3       ~ 210 1
14 NGC 4384 EmG 12 25 12.012 +54 30 22.07   13.5       ~ 135 1
15 NGC 5534 EmG 14 17 40.2662736312 -07 25 02.573630076   13.6   13.4 12.7 ~ 95 0
16 NGC 5691 EmG 14 37 53.339 -00 23 55.94   12.9   12.9 12.4 ~ 114 0
17 NGC 5915 GiP 15 21 33.076 -13 05 30.22   13.1   12.32 12.7 ~ 117 0
18 NGC 7625 AG? 23 20 30.132 +17 13 32.16 13.31 13.23 11.98 11.25   ~ 280 0

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