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J/ApJ/789/76           UV and IR properties for galaxies            (Mao+, 2014)

Characterizing ultraviolet and infrared observational properties for galaxies. II. Features of attenuation law. Mao Y.-W., Kong X., Lin L. <Astrophys. J., 789, 76 (2014)> =2014ApJ...789...76M (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, photometry ; Interstellar medium ; Photometry, infrared; Photometry, ultraviolet Keywords: dust, extinction - galaxies: ISM - galaxies: spiral - infrared: galaxies - ultraviolet: galaxies Abstract: Variations in the attenuation law have a significant impact on observed spectral energy distributions for galaxies. As one important observational property for galaxies at ultraviolet and infrared wavelength bands, the correlation between infrared-to-ultraviolet luminosity ratio and ultraviolet color index (or ultraviolet spectral slope), i.e., the IRX-UV relation (or IRX-β relation), offered a widely used formula for correcting dust attenuation in galaxies, but the usability appears to be in doubt now because of considerable dispersion in this relation found by many studies. In this paper, on the basis of spectral synthesis modeling and spatially resolved measurements of four nearby spiral galaxies, we provide an interpretation of the deviation in the IRX-UV relation with variations in the attenuation law. From both theoretical and observational viewpoints, two components in the attenuation curve, the linear background and the 2175 Å bump, are suggested to be the parameters in addition to the stellar population age (addressed in the first paper of this series) in the IRX-UV function; different features in the attenuation curve are diagnosed for the galaxies in our sample. Nevertheless, it is often difficult to ascertain the attenuation law for galaxies in actual observations. Possible reasons for preventing the successful detection of the parameters in the attenuation curve are also discussed in this paper, including the degeneracy of the linear background and the 2175 Å bump in observational channels, the requirement for young and dust-rich systems to study, and the difficulty in accurate estimates of dust attenuations at different wavelength bands. Description: Broadband FUV and NUV imaging data were obtained from GALEX observations and downloaded from the Multimission Archive at Space Telescope Science Institute (MAST) Web site (http://galex.stsci.edu/); 8um (dust-only) and 24um images were observed by the Spitzer Space Telescope (Spitzer) and retrieved from the SINGS data distribution service (http://irsa.ipac.caltech.edu/data/SPITZER/SINGS/). Hα narrowband imaging data are also employed in this work. The Hα narrowband image for NGC 3031 was observed by the 60/90 cm Schmidt telescope at Xing-Long station of the National Astronomical Observatories of China with the filter of transmission profile FWHM∼120Å. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 119 400 Aperture Photometry of the UV Clusters table4.dat 119 343 Aperture Photometry of the IR Clusters
See also: J/AJ/121/3048 : Multicolor photometry in NGC 1512 and NGC 5248 (Maoz+, 2001) J/ApJS/143/377 : UV-to-FIR magnitudes for 83 starburst galaxies (Wu+, 2002) J/ApJ/586/794 : Multiwavelength luminosities of galaxies (Bell, 2003) J/ApJS/173/185 : GALEX ultraviolet atlas of nearby galaxies (Gil de Paz+, 2007) J/ApJ/757/52 : UV and IR observations for SINGS galaxies. I. (Mao+, 2012) J/ApJS/199/22 : UV to far-IR photometry of galaxies (Hernandez-Fernandez+, 2012) J/ApJ/783/135 : UV to IR fluxes of 221 early-type galaxies (Amblard+, 2014) J/A+A/581/A33 : Nearby radio galaxies FUV to MIR properties (De Ruiter+, 2015) J/AJ/150/31 : Photometry and redshifts of galaxies in the UDF (Rafelski+, 2015) Byte-by-byte Description of file: table3.dat table4.dat
Bytes Format Units Label Explanations
1- 14 A14 --- ID Identifier (1) 16- 22 F7.3 deg RAdeg Aperture Right Ascension (J2000) 24- 29 F6.3 deg DEdeg Aperture Declination (J2000) 31- 38 E8.2 10-7W LFUV GALEX/FUV band luminosity; erg/s (2) 40- 47 E8.2 10-7W e_LFUV Uncertainty in LFUV 49- 56 E8.2 10-7W LNUV GALEX/NUV band luminosity; erg/s (2) 58- 65 E8.2 10-7W e_LNUV Uncertainty in LNUV 67- 74 E8.2 10-7W LHa The Hα luminosity; erg/s (3) 76- 83 E8.2 10-7W e_LHa Uncertainty in LHa 85- 92 E8.2 10-7W L8 Spitzer/IRAC 8 micron band dust luminosity; erg/s (3) 94-101 E8.2 10-7W e_L8 Uncertainty in L8 103-110 E8.2 10-7W L24 Spitzer/MIPS 24 micron band luminosity; erg/s (3) 112-119 E8.2 10-7W e_L24 Uncertainty in L24
Note (1): The aperture radius is 8.5'' for NGC 3031 and 6.8'' for NGC 4536, NGC 5194, and NGC 7331. Note (2): Luminosity measured after local background subtraction and corrected for Galactic foreground extinction and aperture effects. Note (3): Luminosity measured after local background subtraction and corrected for aperture effects.
History: From electronic version of the journal References: Mao et al., Paper I, 2012ApJ...757...52M, Cat. J/ApJ/757/52
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 06-Mar-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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