J/A+A/425/417 Star formation rates of blue compact galaxies (Kong+, 2004)
Spectroscopic study of blue compact galaxies.
IV. Star formation rates and gas depletion timescales.
Kong Xu
<Astron. Astrophys., 425, 417-427 (2004)>
=2004A&A...425..417K 2004A&A...425..417K
ADC_Keywords: Galaxies, spectra
Keywords: galaxies: general - ISM: dust, extinction - galaxies: starburst -
galaxies: formation
Abstract:
Using Halpha, [OII]3727, infrared (IR), radio (1.4GHz) luminosities
and neutral hydrogen (HI) gas masses, we estimated star formation
rates and gas depletion timescales of 72 star-forming blue compact
galaxies (BCGs)
To assess the possible systematic differences among different star
formation rate indicators, we compared the star formation rates
derived from Halpha, [OII]3727, IR, and radio luminosities, and
investigated the effects from underlying stellar absorption and dust
extinction. We found that subtracting underlying stellar absorption is
very important to calculate both dust extinction and star formation
rate of galaxies. Otherwise, the intrinsic extinction will be
overestimated, the star formation rates derived from [OII]3727 and
Halpha will be underestimated (if the underlying stellar absorption
and the internal extinction were not corrected from the observed
luminosity) or overestimated (if an overestimated internal extinction
were used for extinction correction). After both the underlying
stellar absorption and the dust extinction were corrected, a
remarkably good correlation emerges among Halpha, [OII]3727, IR and
radio star formation rate indicators.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 126 72 SFRs and gas depletion timescales of BCGs
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See also:
J/A+A/389/845 : Spectra of blue compact galaxies. I (Kong+, 2002)
J/A+A/396/503 : Spectra of blue compact galaxies. II (Kong+, 2002)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name 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)
24 A1 --- DE- Declination sign (J2000)
25- 26 I2 deg DEd Declination (J2000)
28- 29 I2 arcmin DEm Declination (J2000)
31- 32 I2 arcsec DEs Declination (J2000)
37- 43 F7.3 solMass/yr SFROII Star Formation Rate from [OII]3727
46- 52 F7.3 solMass/yr SFRHa Star Formation Rate from Halpha6563
55- 61 F7.3 solMass/yr SFRIR Star Formation Rate from IR luminosity (1)
64- 70 F7.3 solMass/yr SFR1.4 Star Formation Rate from 1.4GHz radio
continuum (2)
73- 80 E8.3 solMass MHI Neutral hydrogen gas mass, in solar mass (3)
84- 89 F6.3 Gyr tauOII Gas depletion timescale from [OII]3727 (4)
93- 98 F6.3 Gyr tauHa Gas depletion timescale from Halpha6563
102-107 F6.3 Gyr tauIR Gas depletion timescale from IR
111-116 F6.3 Gyr tau1.4 Gas depletion timescale from 1.4GHz continuum
120-126 F7.3 mag BMAG Galaxy absolute magnitude in B band
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Note (1): 58 of 72 blue compact galaxies in our sample are detected by IRAS,
SFRIR of these galaxies are listed in table1.
For others, SFRIR=0.000.
Note (2): SFR1.4 for 47 BCGs in our sample with NVSS and FIRST detection
were listed, and SFR1.4=0.000 for others.
Note (3): 62 BCGs have neutral hydrogen gas masses.
Note (4): If a BCG has MHI=0 or SFR=0, gas depletion timescale of it was
set to 0.
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Acknowledgements: Xu Kong, xkong(at)optik.mtk.nao.ac.jp
References:
Kong & Chen, Paper I 2002A&A...389..845K 2002A&A...389..845K, Cat. J/A+A/389/845
Kong et al., Paper II 2002A&A...396..503K 2002A&A...396..503K, Cat. J/A+A/396/503
Kong et al., Paper III 2003A&A...403..877K 2003A&A...403..877K
(End) Patricia Vannier [CDS] 24-Sep-2004