J/A+A/459/L13 A composite HII region luminosity function (Bradley+, 2006)
A composite HII region luminosity function in Hα of unprecedented
statistical weight.
Bradley T.R., Knapen J.H., Beckman J.E., Folkes S.L.
<Astron. Astrophys. 459, L13 (2006)>
=2006A&A...459L..13B 2006A&A...459L..13B
ADC_Keywords: H II regions ; Photometry, H-alpha ; Galaxies, nearby
Keywords: galaxies: spirals - galaxies: structure - ISM: HII regions
Abstract:
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 were derived for individual galaxies
which, after photometric calibration, were summed to form a total
luminosity function comprising 17797 HII regions from 53 galaxies.
Description:
HII region catalogues for 57 face on spiral galaxies within
v<2600km/s are presented. For each galaxy the following information
is given for the HII regions; position from the galaxy centre,
logarithm of the integrated luminosity is erg/s (which is 10-7W
in SI units), area of the HII region in units of pc2 and the value of
the local background.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
galaxies.dat 44 57 Galaxies positions (from Simbad)
hii/* . 57 HII region catalogue for each galaxy
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See also:
VI/112 : Optical Imaging of 57 spiral galaxies (Knapen+ 2004)
Byte-by-byte Description of file: galaxies.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Galaxy Galaxy name
11- 12 I2 h RAh Right ascension (J2000)
14- 15 I2 min RAm Right ascension (J2000)
17- 20 F4.1 s RAs Right ascension (J2000)
22 A1 --- DE- Declination sign (J2000)
23- 24 I2 deg DEd Declination (J2000)
26- 27 I2 arcmin DEm Declination (J2000)
29- 30 I2 arcsec DEs Declination (J2000)
33- 44 A12 --- FileName Name of the file in the hii subdirectory
containing the HII regions data
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Byte-by-byte Description of file: hii/*
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Bytes Format Units Label Explanations
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1- 5 I5 --- Seq HII region identifier
6- 13 F8.1 arcsec Xpos Position with respect to the galaxy centre
14- 21 F8.1 arcsec Ypos Position with respect to the galaxy centre
22- 29 F8.3 [10-7W] logL log of (background subtracted luminosity)
30- 39 E10.2 pc+2 Area Area of HII region
40- 47 F8.3 [10-7W] logLbgnd ? log of (local background luminosity)
48- 51 A4 --- n_logLbgnd [NaN -Inf] NaN: not analysed,
-Inf: -∞
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Acknowledgements: Johan Knapen, knapen(at)star.herts.ac.uk
(End) Patricia Vannier [CDS] 22-Sep-2006