1998AJ....116.2166U

Query : 1998AJ....116.2166U

1998AJ....116.2166U - Astron. J., 116, 2166-2176 (1998/November-0)

Photometric observations of star formation activity in early-type spiral galaxies.

USUI T., SAITO M. and TOMITA A.

Abstract (from CDS):

We observationally study the current star formation activities of early-type spiral galaxies. We construct a complete sample of 15 early-type spiral galaxies having ratios of far-infrared (FIR) to optical B-band luminosity, log (LFIR/LB), larger than average for this type and present CCD imaging of the R and Hα bands. The equivalent widths of Hα emission increase with increasing LFIR/LB, indicating that log (LFIR/LB) can be an indicator of star formation for such early-type spiral galaxies with star formation activities higher than average. For all of the observed early-type spiral galaxies, the extended H II regions exist at the central regions with some asymmetric features. Hα emission is more concentrated to the galactic center than the R-band light, and the degree of the concentration increases with the star formation activity. We also analyze the relation between the star formation activities and the existence of companion galaxies in the sample galaxies and other bright early-type spiral galaxies. No correlation is found; this suggests that the interaction is not responsible for all of the star formation activities of early-type spiral galaxies.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Interactions - Galaxies: Photometry - Galaxies: Starburst - Galaxies: Spiral

Simbad objects: 25

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Number of rows : 25
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 NGC 681 Sy2 01 49 10.8143098656 -10 25 34.813193736   12.5   11.30 12.1 ~ 134 0
2 NGC 1022 GiG 02 38 32.703 -06 40 38.60 12.33 12.09 11.34     ~ 203 1
3 NGC 2782 Sy2 09 14 05.1 +40 06 49 12.29 12.30 11.63     ~ 472 3
4 NGC 2992 Sy2 09 45 42.045 -14 19 34.90 13.54 13.14 12.18 12.6 12.2 ~ 890 3
5 NGC 2993 Sy1 09 45 48.325 -14 22 06.02 12.72 13.11 12.64 13.4 13.0 ~ 182 1
6 NGC 3055 AG? 09 55 18.0694667208 +04 16 12.034089444   12.3       ~ 119 0
7 NGC 3442 GiG 10 53 08.0999856384 +33 54 37.298426436   13.2       ~ 90 1
8 NGC 3504 LIN 11 03 11.3 +27 58 21   13.48 12.93     ~ 524 2
9 NGC 3512 GiP 11 04 02.9540255952 +28 02 12.394037112   13.7 12.87     ~ 160 0
10 NGC 3611 GiG 11 17 30.2 +04 33 19   12.4       ~ 125 0
11 NGC 3729 GiP 11 33 49.321 +53 07 31.79   12.2       ~ 206 1
12 NGC 4045 AGN 12 02 42.2505701136 +01 58 36.362990064   13.144   16.938 12.1 ~ 198 0
13 NGC 4369 GiG 12 24 36.204 +39 22 58.73   12.3       ~ 189 1
14 NGC 4384 EmG 12 25 12.012 +54 30 22.07   13.5       ~ 125 1
15 NGC 5534 EmG 14 17 40.2662736312 -07 25 02.573630076   13.6   13.4 12.7 ~ 88 0
16 NGC 5691 EmG 14 37 53.339 -00 23 55.94   12.9   12.9 12.4 ~ 107 0
17 MCG-02-39-018 EmG 15 21 13.843 -13 06 02.24   15   13.42   ~ 34 1
18 NGC 5915 GiP 15 21 33.076 -13 05 30.22   13.1   12.32 12.7 ~ 109 0
19 NGC 5916 EmG 15 21 37.9008341232 -13 10 09.728182848   14   12.51   ~ 51 0
20 NGC 6207 GiC 16 43 03.750 +36 49 56.73   12.189 11.651 11.240 10.691 ~ 241 0
21 NGC 6574 GiG 18 11 51.2465713056 +14 58 54.747570108   12.5       ~ 179 0
22 NGC 7217 LIN 22 07 52.3984675584 +31 21 33.632293572   12.94 11.92     ~ 494 0
23 NGC 7448 AG? 23 00 03.589 +15 58 49.31   12.0       ~ 228 0
24 NGC 7625 AG? 23 20 30.132 +17 13 32.16 13.31 13.23 11.98 11.25   ~ 264 0
25 NGC 7743 Sy2 23 44 21.1607807112 +09 56 02.970989664   14.19 13.28     ~ 313 0

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