2009A&A...501..207J


Query : 2009A&A...501..207J

2009A&A...501..207J - Astronomy and Astrophysics, volume 501, 207-220 (2009/7-1)

The Hα galaxy survey. VII. The spatial distribution of star formation within disks and bulges.

JAMES P.A., BRETHERTON C.F. and KNAPEN J.H.

Abstract (from CDS):

We analyse the current build-up of stellar mass within the disks and bulges of nearby galaxies through a comparison of the spatial distributions of forming and old stellar populations. Hα and R-band imaging are used to determine the distributions of young and old stellar populations in 313 S0a-Im field galaxies out to ∼40Mpc. Concentration indices and mean normalised light profiles are calculated as a function of galaxy type and bar classification. The mean profiles and concentration indices show a strong and smooth dependence on galaxy type. Apart from a central deficit due to bulge/bar light in some galaxy types, mean Hα and R-band profiles are very similar. Mean profiles within a given type are remarkably constant even given wide ranges in galaxy luminosity and size. SBc, SBbc, and particularly SBb galaxies have profiles that are markedly different from those of unbarred galaxies. The Hα emission from individual SBb galaxies is studied in detail; virtually all show resolved central components and concentrations of star formation at or just outside the bar-end radius. Galaxy type is an excellent predictor of R-band light profile. In field galaxies, star formation has the same radial distribution as R-band light, i.e. stellar mass is building at approximately constant morphology, with no strong evidence for outer truncation or inside-out disk formation. Bars have a strong impact on the radial distribution of star formation, particularly in SBb galaxies.

Abstract Copyright:

Journal keyword(s): galaxies: spiral - galaxies: structure - galaxies: stellar content - galaxies: nuclei - galaxies: irregular

Simbad objects: 21

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Number of rows : 21
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16509 1
2 UGC 3685 GiG 07 09 05.9246956320 +61 35 44.062687680   13.1       ~ 50 0
3 NGC 2460 AGN 07 56 52.3308252792 +60 20 57.759748944   12.5       ~ 125 0
4 NGC 2543 GiP 08 12 57.955 +36 15 16.23   12.70       ~ 155 1
5 NGC 2608 IG 08 35 17.3298089184 +28 28 24.236326236   13.2       ~ 170 0
6 NGC 2633 GiP 08 48 04.6279110889 +74 05 55.032130996   12.4       ~ 163 1
7 NGC 2712 G 08 59 30.4854395352 +44 54 50.079495852   12.30       ~ 172 0
8 NGC 2710 G 08 59 48.3670133496 +55 42 22.674325032   13.66       ~ 62 1
9 NGC 3485 AGN 11 00 02.3705905728 +14 50 29.983054596   12.8       ~ 117 0
10 NGC 3507 GiP 11 03 25.3619733360 +18 08 07.607343732   11.4       ~ 172 0
11 NGC 3769 GiP 11 37 44.0727836208 +47 53 34.782808956   11.7       ~ 174 0
12 MCG+08-21-077 GiP 11 37 50.277 +47 52 53.98   14.7       ~ 38 0
13 NGC 3810 GiG 11 40 58.7615811624 +11 28 15.808680696   11.4       ~ 325 2
14 NGC 3893 GiP 11 48 38.207 +48 42 38.84   11.23 10.67     ~ 357 1
15 NGC 4037 EmG 12 01 23.6605207728 +13 24 03.710175552   13.8       ~ 116 0
16 NGC 4394 GiP 12 25 55.6366312872 +18 12 50.110707636   11.9       ~ 352 0
17 M 91 LIN 12 35 26.4446761320 +14 29 46.760333748   14.63 13.57     ~ 569 0
18 NGC 5204 LSB 13 29 36.508 +58 25 07.43   11.84   11.37   ~ 452 0
19 NGC 5832 G 14 57 45.90 +71 40 53.5 13.43 12.80 12.26 11.96   ~ 110 1
20 NGC 7714 GiP 23 36 14.1257730600 +02 09 18.197422668   14.91 14.36     ~ 753 1
21 APG 284 PaG 23 36 19 +02 09.3   12.6       ~ 606 0

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2023.01.31-07:53:01

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