2006A&A...459L..13B


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST00:06:46

2006A&A...459L..13B - Astronomy and Astrophysics, volume 459, L13-16 (2006/11-3)

A composite HII region luminosity function in Hα of unprecedented statistical weight.

BRADLEY T.R., KNAPEN J.H., BECKMAN J.E. and FOLKES S.L.

Abstract (from CDS):

Statistical properties of HII region populations in disk galaxies yield important clues to the physics of massive star formation. We present a set of HII region catalogues and luminosity functions for a sample of 56 spiral galaxies in order to derive the most general form of their luminosity function. HII region luminosity functions are derived for individual galaxies which, after photometric calibration, are summed to form a total luminosity function comprising 17797 HII regions from 53 galaxies. The total luminosity function, above its lower limit of completeness, is clearly best fitted by a double power law with a significantly steeper slope for the high luminosity portion of the function. This change of slope has been reported in the literature for individual galaxies, and occurs at a luminosity of logL=38.6±0.1 (L in erg/s) which has been termed the Stroemgren luminosity. A steep fall off in the luminosity function above logL=40 is also noted, and is related to an upper limit to the luminosities of underlying massive stellar clusters. Detailed data are presented for the individual sample galaxies. The luminosity functions of HII regions in spiral galaxies show a two slope power law behaviour, with a significantly steeper slope for the high luminosity branch. This can be modelled by assuming that the high luminosity regions are density bounded, though the scenario is complicated by the inhomogeneity of the ionized interstellar medium. The break, irrespective of its origin, is of potential use as a distance indicator for disc galaxies.

Abstract Copyright:

Journal keyword(s): galaxies: spiral - galaxies: structure - ISM: HII regions

VizieR on-line data: <Available at CDS (J/A+A/459/L13): galaxies.dat hii/*>

Nomenclature: Tables hii: [BKB2006] NGC NNNN NNNN N=17797.

Status at CDS:   All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 62

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Number of rows : 62

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 210 GiP 00 40 34.9915408968 -13 52 21.998215700   11.8   11.00 11.4 ~ 160 0
2 MCG-01-03-065 LSB 01 01 33.987 -07 35 18.75 12.57 12.70 12.17 12.8 12.5 ~ 70 1
3 NGC 488 GiG 01 21 46.848 +05 15 24.19   15.0       ~ 279 0
4 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5135 1
5 M 74 G 01 36 41.772 +15 47 00.46 10.52 10.00 9.46 9.16   ~ 1401 1
6 NGC 864 H2G 02 15 27.641 +06 00 09.43   12.00       ~ 203 1
7 NGC 1042 GiP 02 40 23.9725496856 -08 26 00.749394900 11.47 11.56 11.02 11.7 11.4 ~ 222 1
8 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 4093 2
9 NGC 1073 EmG 02 43 40.598 +01 22 33.13   11.3   11.3 11.8 ~ 306 0
10 NGC 1179 LSB 03 02 38.42 -18 53 51.4   12.61   11.83 12.2 ~ 89 0
11 NGC 1169 GiG 03 03 34.756 +46 23 10.74   13.2       ~ 100 0
12 NGC 1300 GiP 03 19 41.0453355271 -19 24 40.141850719   11.16 10.42 9.90 10.7 ~ 439 0
13 UGC 4305 IG 08 19 04.9878269182 +70 43 13.025604473 12.06 11.72 11.39 11.11   ~ 690 2
14 NGC 2775 G 09 10 20.112 +07 02 16.53   11.417 10.481 9.920 8.994 ~ 318 0
15 NGC 2805 GiP 09 20 20.3890361599 +64 06 10.699751669   11.9       ~ 191 1
16 NGC 2985 Sy1 09 50 22.233 +72 16 43.13   11.37 10.61     ~ 222 1
17 NGC 3180 GiG 10 18 16.985 +41 25 27.77   10.4       ~ 628 0
18 NGC 3227 GiP 10 23 30.57 +19 51 54.3   12.61 11.79     ~ 1533 2
19 NGC 3344 EmG 10 43 31.150 +24 55 19.99 10.38 10.54 9.86 9.71   ~ 343 1
20 M 95 GiP 10 43 57.733 +11 42 13.00 10.71 10.51 9.73 9.48   ~ 936 2
21 M 96 GiP 10 46 45.744 +11 49 11.78 10.42 10.15 9.25 8.99   ~ 742 1
22 NGC 3486 Sy2 11 00 23.946 +28 58 29.35 10.89 11.11 10.53 10.40   ~ 317 1
23 NGC 3631 IG 11 21 02.944 +53 10 09.95   11.0       ~ 324 1
24 NGC 3726 GiG 11 33 21.1357515876 +47 01 45.260627622   11.11   10.02   ~ 321 0
25 NGC 3810 GiG 11 40 58.737 +11 28 16.07   11.4       ~ 304 1
26 NGC 4030 GiP 12 00 23.6122434029 -01 06 00.223672461   11.42   10.3 10.4 ~ 292 1
27 NGC 4051 Sy1 12 03 09.6098828919 +44 31 52.693714606   11.08 12.92 9.94   ~ 1992 1
28 NGC 4123 AGN 12 08 11.082 +02 52 41.91   13.1       ~ 308 1
29 NGC 4145 GiP 12 10 01.524 +39 53 01.90   12.2       ~ 145 0
30 NGC 4151 Sy1 12 10 32.5771747733 +39 24 21.057727323   12.18 11.48     ~ 3380 2
31 NGC 4242 GiG 12 17 30.1848324010 +45 37 09.511603113   11.37 10.83     ~ 225 1
32 M 99 H2G 12 18 49.625 +14 24 59.36 10.45 10.44 9.87     ~ 763 2
33 M 61 Sy2 12 21 54.9275149050 +04 28 25.588335799 10.07 10.18 9.65     ~ 871 2
34 NGC 4314 LIN 12 22 31.978 +29 53 43.09 11.72 11.43 10.58     ~ 450 1
35 M 100 AGN 12 22 54.9318850854 +15 49 20.294302163 10.04 10.05 9.35     ~ 1647 2
36 NGC 4395 Sy2 12 25 48.8639154223 +33 32 48.694684028 10.84 10.54 10.11 9.98   ~ 994 1
37 NGC 4450 LIN 12 28 29.634 +17 05 05.82   10.90 10.08     ~ 510 1
38 NGC 4487 GiG 12 31 04.4737580846 -08 03 14.545380600   11.7   11.9 11.6 ~ 152 0
39 NGC 4535 H2G 12 34 20.310 +08 11 51.94   11.1       ~ 521 0
40 M 91 LIN 12 35 26.430 +14 29 46.75   14.63 13.57     ~ 524 0
41 M 58 SyG 12 37 43.597 +11 49 05.12 10.80 10.48 9.66     ~ 969 2
42 NGC 4618 GiP 12 41 32.8926165605 +41 09 03.051998352 11.03 11.22 10.78     ~ 292 2
43 NGC 4689 H2G 12 47 45.5568267764 +13 45 46.148221803   12.8       ~ 333 0
44 NGC 4725 Sy2 12 50 26.5692916552 +25 30 02.737610391   13.45 12.44     ~ 621 2
45 M 94 SyG 12 50 53.148 +41 07 12.55 9.15 8.96 8.24 7.78   ~ 1217 3
46 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3782 4
47 NGC 5248 GiG 13 37 32.069 +08 53 06.22   11.4       ~ 442 0
48 NGC 5247 GiG 13 38 03.0179394007 -17 53 02.635368748   10.77   9.96 10.5 ~ 203 0
49 NGC 5334 LSB 13 52 54.4632693594 -01 06 52.601149767   12.0   12.3 12.1 ~ 150 0
50 NGC 5390 LIN 13 55 40.023 +40 27 42.37   12.81 11.93 10.04   ~ 319 1
51 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2546 2
52 NGC 5474 GiP 14 05 01.608 +53 39 43.95   11.28 10.79     ~ 385 1
53 NGC 5850 LIN 15 07 07.676 +01 32 39.41   11.5   10.79 11.1 ~ 279 1
54 NGC 5921 G 15 21 56.561 +05 04 13.94   12.7       ~ 254 0
55 NGC 5964 EmG 15 37 36.2079075769 +05 58 26.341551620   12.45 11.82 11.48 10.89 ~ 112 0
56 NGC 6140 G 16 20 58.162 +65 23 25.98   12.6       ~ 95 0
57 NGC 6384 G 17 32 24.302 +07 03 36.97   13.2       ~ 290 0
58 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1430 0
59 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2235 2
60 NGC 7479 Sy2 23 04 56.668 +12 19 22.36 11.74 11.60 10.85 10.47 9.66 ~ 665 2
61 NGC 7727 GiP 23 39 53.870 -12 17 34.84   11   10.55   ~ 159 0
62 NGC 7741 GiP 23 43 54.375 +26 04 32.07 11.70 11.84 11.31     ~ 269 1

    Equat.    Gal    SGal    Ecl

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2020.07.14-00:06:46

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