J/MNRAS/380/1098 UV-upturn of elliptical galaxies model (Han+, 2007)
A binary model for the UV-upturn of elliptical galaxies.
Han Z., Podsiadlowski P., Lynas-Gray A.E.
<Mon. Not. R. Astron. Soc., 380, 1098-1118 (2007)>
=2007MNRAS.380.1098H 2007MNRAS.380.1098H
ADC_Keywords: Models, evolutionary ; Galaxies, photometry ; Ultraviolet
Keywords: binaries: close - subdwarfs -
galaxies: elliptical and lenticular, cD - galaxies: starburst -
ultraviolet: galaxies
Abstract:
A long-standing problem in the study of elliptical galaxies is the
far-ultraviolet (FUV) excess in their spectra (also known as
UV-upturn, UV rising-branch, UV rising flux, or UVX). While it is now
clear that this UV excess is caused by an old population of hot
helium-burning stars without large hydrogen-rich envelopes. We have
developed an evolutionary population synthesis (EPS) model for the FUV
excess of elliptical galaxies based on the binary model of Han et al.
(2002MNRAS.336..449H 2002MNRAS.336..449H and 2003MNRAS.341..669H 2003MNRAS.341..669H) for the formation of hot
subdwarfs in our Galaxy. We give the colour evolution of a simple
stellar population (SSP) (including binaries) of 1010M☉ for
our standard simulation set. We have also compiled a file for the SED
evolution, in which the SEDs without binary interactions are also
supplied.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 88 88 Colour evolution of a Simple Stellar Population
age.dat 16 88 The age corresponding to each age number
lambda.dat 16 1221 The wavelength corresponding to each wavelength
number
sed.dat 42 107448 SED evolution of a Simple Stellar Population (SSP)
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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3- 8 F6.3 [Gyr] log(t) Population age
10- 16 F7.3 mag VMAG Absolute visual magnitude
20- 24 F5.3 mag (B-V) B-V colour index
27- 32 F6.3 mag (1550-V) 1550-V colour index
35- 40 F6.3 mag (2000-V) 2000-V colour index
43- 48 F6.3 mag (2500-V) 2500-V colour index
51- 56 F6.3 mag (1500-2500) 1500-2500 colour index
60- 64 F5.3 mag (FUV-r)AB FUV-r colour index in AB system
68- 72 F5.3 mag (NUV-r)AB NUV-r colour index in AB system
75- 80 F6.3 mag (FUV-NUV)AB FUV-NUV colour index in AB system
82- 88 F7.3 --- betaFUV FUV spectral index
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Byte-by-byte Description of file: age.dat
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Bytes Format Units Label Explanations
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2- 6 I5 -- Iage Population age number
11- 16 F6.3 Gyr log(t) Population age
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Byte-by-byte Description of file: lambda.dat
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Bytes Format Units Label Explanations
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2- 6 I5 -- Jwav Wavelength number
7- 16 F10.1 0.1nm lambda Wavelength (Å)
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Byte-by-byte Description of file: sed.dat
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Bytes Format Units Label Explanations
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2- 6 I5 -- Iage Population age number
8- 12 I5 -- Jwav Wavelength number
15- 27 E13.6 10mW/m2/nm Fluxb Flux with binary, in erg/s/cm2/Å (1)
30- 42 E13.6 10mW/m2/nm Fluxs Flux without binary, in erg/s/cm2/Å (2)
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Note (1): Flux (at jwav and iage) for a SSP of 1010M☉ at a distance of
10Mpc, with binary interactions considered
Note (2): Flux (at jwav and iage) for a SSP of 1010M☉ at a distance of
10Mpc, WITHOUT binary interactions considered
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Acknowledgements:
Zhanwen Han, zhanwenhan(at)ynao.ac.cn
(End) Patricia Vannier [CDS] 02-Oct-2007