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

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

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 - 2024 		#notes
1 NGC 210 GiP 00 40 34.9927609368 -13 52 21.999585108   11.8   11.00 11.4 ~ 174 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 ~ 78 1
3 NGC 488 GiG 01 21 46.7967133224 +05 15 24.623017524   15.0       ~ 290 0
4 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 5838 1
5 M 74 G 01 36 41.7451236624 +15 47 01.107512304 10.52 10.00 9.46 9.16   ~ 1736 1
6 NGC 864 H2G 02 15 27.641 +06 00 09.43   12.00       ~ 220 1
7 NGC 1042 EmG 02 40 23.9724818544 -08 26 00.736256616 11.47 11.56 11.02 11.7 11.4 ~ 260 1
8 M 77 Sy2 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4602 2
9 NGC 1073 EmG 02 43 40.598 +01 22 33.13   11.3   11.3 11.8 ~ 326 0
10 NGC 1179 LSB 03 02 38.48 -18 53 52.0   12.61   11.83 12.2 ~ 98 0
11 NGC 1169 GiG 03 03 34.7219788176 +46 23 10.814305020   13.2       ~ 108 0
12 NGC 1300 Sy2 03 19 41.0462219928 -19 24 40.187565432   11.16 10.42 9.90 10.7 ~ 536 0
13 UGC 4305 IG 08 19 04.9864630512 +70 43 13.086910452 12.06 11.72 11.39 11.11   ~ 769 2
14 NGC 2775 AG? 09 10 20.1334093488 +07 02 16.874157048   11.417 10.481 9.920 8.994 ~ 356 0
15 NGC 2805 GiP 09 20 20.3891233968 +64 06 10.716485004   11.9       ~ 214 1
16 NGC 2985 Sy1 09 50 22.233 +72 16 43.13   11.37 10.61     ~ 251 1
17 NGC 3180 GiG 10 18 16.985 +41 25 27.77   10.4       ~ 735 0
18 NGC 3227 Sy1 10 23 30.5765149296 +19 51 54.282206700   12.61 11.79     ~ 1703 1
19 NGC 3344 EmG 10 43 31.150 +24 55 19.99 10.38 10.54 9.86 9.71   ~ 406 1
20 M 95 GiP 10 43 57.7313485800 +11 42 13.301191332 10.71 10.51 9.73 9.48   ~ 1122 2
21 M 96 GiP 10 46 45.744 +11 49 11.78 10.42 10.15 9.25 8.99   ~ 819 1
22 NGC 3486 Sy2 11 00 23.946 +28 58 29.35 10.89 11.11 10.53 10.40   ~ 354 1
23 NGC 3631 AG? 11 21 02.8871865144 +53 10 10.415331660   11.0       ~ 360 1
24 NGC 3726 GiG 11 33 21.1367545656 +47 01 45.280222428   11.11   10.02   ~ 354 0
25 NGC 3810 GiG 11 40 58.7615811624 +11 28 15.808680696   11.4       ~ 335 2
26 NGC 4030 GiP 12 00 23.6102390784 -01 06 00.197099136   11.42   10.3 10.4 ~ 340 1
27 NGC 4051 Sy1 12 03 09.6101337312 +44 31 52.682601288   11.08 12.92 9.94   ~ 2166 1
28 NGC 4123 AGN 12 08 11.1187718376 +02 52 41.781736956   13.1       ~ 340 2
29 NGC 4145 GiP 12 10 01.51272 +39 53 02.0076           ~ 159 1
30 NGC 4151 Sy1 12 10 32.5759813872 +39 24 21.063527532   12.18 11.48     ~ 3692 2
31 NGC 4242 GiG 12 17 30.1835103480 +45 37 09.508940220   11.37 10.83     ~ 269 1
32 M 99 H2G 12 18 49.625 +14 24 59.36 10.45 10.44 9.87     ~ 919 2
33 M 61 Sy2 12 21 54.9282582888 +04 28 25.597367184 10.07 10.18 9.65     ~ 998 2
34 NGC 4314 LIN 12 22 32.0223000912 +29 53 43.814812200 11.72 11.43 10.58     ~ 479 1
35 M 100 AGN 12 22 54.9299993592 +15 49 20.296257960 10.04 10.05 9.35     ~ 1847 2
36 NGC 4395 Sy2 12 25 48.8633109888 +33 32 48.700168152 10.84 10.54 10.11 9.98   ~ 1178 1
37 NGC 4450 LIN 12 28 29.5910654016 +17 05 05.976112020   10.90 10.08     ~ 564 2
38 NGC 4487 EmG 12 31 04.4731449720 -08 03 14.548820040   11.7   11.9 11.6 ~ 176 0
39 NGC 4535 H2G 12 34 20.3443516704 +08 11 51.908488116   11.1       ~ 617 0
40 M 91 LIN 12 35 26.4446761320 +14 29 46.760333748   14.63 13.57     ~ 594 0
41 M 58 Sy2 12 37 43.5 +11 49 06 10.80 10.48 9.66     ~ 1079 2
42 NGC 4618 GiP 12 41 32.8976471760 +41 09 03.185175528 11.03 11.22 10.78     ~ 329 2
43 NGC 4689 H2G 12 47 45.5568088416 +13 45 46.135889100   12.8       ~ 387 0
44 NGC 4725 Sy2 12 50 26.5716367992 +25 30 02.733090588   13.45 12.44     ~ 695 2
45 M 94 SyG 12 50 53.0737971432 +41 07 12.900884628 9.15 8.96 8.24 7.78   ~ 1386 2
46 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4330 4
47 NGC 5248 GiG 13 37 32.0145074088 +08 53 06.496982448   11.4       ~ 508 0
48 NGC 5247 GiG 13 38 03.0183262176 -17 53 02.645511252   10.77   9.96 10.5 ~ 220 0
49 NGC 5334 LSB 13 52 54.4632396696 -01 06 52.604999568   12.0   12.3 12.1 ~ 170 0
50 NGC 5390 LIN 13 55 39.9385716624 +40 27 42.380606592   12.81 11.93 10.04   ~ 350 1
51 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2914 2
52 NGC 5474 GiP 14 05 01.608 +53 39 43.95   11.28 10.79     ~ 443 1
53 NGC 5850 LIN 15 07 07.6828131840 +01 32 39.513281352   11.5   10.79 11.1 ~ 315 1
54 NGC 5921 AG? 15 21 56.561 +05 04 13.94   12.7       ~ 276 0
55 NGC 5964 EmG 15 37 36.2103407496 +05 58 26.360661972   12.45 11.82 11.48 10.89 ~ 126 0
56 NGC 6140 AG? 16 20 58.162 +65 23 25.98   12.6       ~ 109 0
57 NGC 6384 AG? 17 32 24.2848390896 +07 03 37.531624968   13.2       ~ 304 0
58 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1562 0
59 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2529 2
60 NGC 7479 Sy2 23 04 56.6432243448 +12 19 22.357387020 11.74 11.60 10.85 10.47 9.66 ~ 743 2
61 NGC 7727 EmG 23 39 53.870 -12 17 34.84   11   10.55   ~ 172 0
62 NGC 7741 GiP 23 43 54.375 +26 04 32.07 11.70 11.84 11.31     ~ 291 1

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