/ftp/cats/J_other/RMxAA/45.261



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J/other/RMxAA/45.261  Diffuse ionized gas database DIGEDA (Flores-Fajardo+ 2009)
The following files can be converted to FITS (extension .fit or fit.gz)
	digeda.dat refsid.dat galaxies.dat refs.dat
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Query from: http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=J/other/RMxAA/45.261
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drwxr-xr-x 29 cats archive 4096 Dec 17 2020 [Up] drwxr-xr-x 2 cats archive 4096 May 26 2021 [TAR file] -rw-r--r-- 1 cats archive 506 Oct 28 2009 .message -r--r--r-- 1 cats archive 12212 Oct 28 2009 ReadMe -rw-r--r-- 1 cats archive 308 Oct 28 2009 +footg5.gif -rw-r--r-- 1 cats archive 2534 Oct 28 2009 +footg8.gif -r--r--r-- 1 cats archive 151723 Sep 10 2009 digeda.dat [txt] [txt.gz] [fits] [fits.gz] [html] -r--r--r-- 1 cats archive 1711 Sep 11 2009 galaxies.dat [txt] [txt.gz] [fits] [fits.gz] [html] -r--r--r-- 1 cats archive 695 Sep 10 2009 refs.dat [txt] [txt.gz] [fits] [fits.gz] [html] -r--r--r-- 1 cats archive 3036 Sep 11 2009 refsid.dat [txt] [txt.gz] [fits] [fits.gz] [html]
Beginning of ReadMe : J/other/RMxAA/45.261 Diffuse ionized gas database DIGEDA (Flores-Fajardo+ 2009) ================================================================================ Analysis of the diffuse ionized gas database: DIGEDA. Flores-Fajardo N., Morisset C., Binette L. <Rev. Mex. Astron. Astrofis., 45, 261-272 (2009)> =2009RMxAA..45..261F ================================================================================ ADC_Keywords: Galaxies, spectra ; H II regions ; Interstellar medium ; Spectroscopy Keywords: astronomical data bases: miscellaneous - galaxies: general - ISM: HII regions - ISM: lines and bands - line: formation Abstract: Studies of the Diffuse Ionized Gas (DIG) have progressed without providing so far any strict criterion to distinguish DIGs from HII regions. In this work, we compile the emission line measurements of 29 galaxies that are available in the scientific literature, thereby setting up the first DIG database DIGEDA. Making use of this database, we proceeded to analyze global properties of the DIG using the [NII]6583/Halpha, [OI]6300/Halpha, [OIII]5007/Hbeta and [SII]6716/Halpha lines ratios, including the Halpha emission measure. This analysis leads us to conclude that the [NII]/Halpha ratio provides an objective criterion for distinguishing whether an emission region is DIG or an HII region, while the EM(Halpha) is a useful quantity only when the galaxies are considered individually. Finally, we find that the emission regions of Irr galaxies classified as DIG in the literature appear in fact to be much more similar to HII regions than to the DIGs of spiral galaxies. Description: DIGEDA is a comprehensive database comprising 1061 DIG and HII region spectroscopic observations of 29 different galaxies (25 spiral galaxies and 4 irregulars) from 18 bibliographic references. This survey contains galaxies with significant spread in star formation rates, Halpha luminosities, distances, disk inclinations, slit positions and slit orientations. The 1061 observations obtained from these references were extracted by digitalization of published figures or tables. The data were subsequently normalized and incorporated in DIGEDA. This resulted in a table of 26 columns containing 1061 data lines or records (DIGEDA.dat file). We have not performed any reddening by dust correction or for the presence of underlying absorption lines, although we did use the reddening corrected ratios when made available by the authors. Missing entries are represented by (-1) in the corresponding data field. In DIGEDA the observed areas are classificated in three possible emission region types: HII region, transition zones or DIG. When this classification was not reported (no matter the criterion) for the authors, we introduce our own classification taking into account the value of |z| as described in the paper.

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