J/A+A/577/A21 Integral Field Spectroscopy of 8 BCGs (Cairos+, 2015)
VIMOS integral field spectroscopy of blue compact galaxies.
I. Morphological properties, diagnostic emission-line ratios and kinematics.
Cairos L.M., Caon N., Weilbacher P.M.
<Astron. Astrophys. 577, A21 (2015)>
=2015A&A...577A..21C 2015A&A...577A..21C
ADC_Keywords: Galaxies, spectra
Keywords: galaxies: dwarf - galaxies: starburst -
galaxies: kinematics and dynamics
Abstract:
Blue Compact Galaxies (BCG) are gas rich, low luminosity, low
metallicity systems, undergoing a violent burst of star formation.
These galaxies offer us a unique opportunity to investigate collective
star formation and its effects on galaxy evolution in a relatively
simple environment. Spatially resolved spectrophotometric studies of
BCGs are essential for a better understanding of the role of
starburst-driven feedback processes on the kinematical and chemical
evolution of low-mass galaxies near and far.
We carry out an integral field spectroscopic study of a sample of
BCGs, with the aim to probe the morphology, kinematics, dust
extinction, and excitation mechanisms of their warm interstellar
medium.
Eight BCGs were observed with the VIMOS integral field unit at the
Very Large Telescope using blue and orange grisms in high resolution
mode. At a spatial sampling of 0.67 per spaxel we covered about
30x30-arcsec on the sky, with a wavelength range of 4150...7400Å.
Emission lines were fitted with a single Gaussian profiles to measure
their wavelength, flux, and width. From these data we built
two-dimensional maps of the continuum and the most prominent
emission-lines, as well as diagnostic line ratios, extinction, and
kinematic maps.
An atlas of emission-line fluxes and continuum emission; ionization,
interstellar extinction, and electron density maps from line ratios;
velocity and velocity dispersion fields. Additionally, from integrated
spectroscopy, tables of the extinction corrected line fluxes and
equivalent widths, diagnostic-line ratios, physical parameters and
abundances for the brightest star-forming knots and for the whole
galaxy.
Description:
Reduced datacubes plus associated errors datacubes for the eight
galaxies in the sample (for Haro 15 only the blue grism data are
available, for Mrk 1131 only the orange grism data).
Each spaxel is 0.67x0.67-arcseconds. Dispersion is 0.62Å/px for the
orange grism spectra, and 0.54 for the blue grism spectra. Flux units
are 10-16erg/cm2/s/Å (per 0.67x0.67arcsec2 spaxel)
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 122 28 List of FITS datacube
fits/* . 28 Individual FITS datacube
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See also:
J/ApJ/708/1076 : The WHIQII survey: compact blue galaxies (Tollerud+, 2010)
J/A+A/556/A10 : Multiband surface photometry of 21 BCGs (Micheva+ 2013)
Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right ascension (J2000)
4- 5 I2 min RAm Right ascension (J2000)
7- 11 F5.2 s RAs Right ascension (J2000)
13 A1 --- DE- Declination sign (J2000)
14- 15 I2 deg DEd Declination (J2000)
17- 18 I2 arcmin DEm Declination (J2000)
20- 23 F4.1 arcsec DEs Declination (J2000)
25- 26 I2 --- Nx [44] Number of pixels along X-axis
28- 29 I2 --- Ny [44] Number of pixels along Y-axis
31- 34 I4 --- Nz [3491/3895] Number of slices
36- 42 F7.2 0.1nm lam.min [4152/5257] Lower value of wavelength interval
44- 50 F7.2 0.1nm lam.max [6204/7422] Upper value of wavelength interval
52- 55 F4.2 0.1nm dlam [0.54/0.62] Wavelength resolution
57- 61 I5 Kibyte Size [16409/28778] Size of the FITS file
63- 74 A12 --- FileName Name of the FITS file in subdirectory fits
76-109 A34 --- Title Title of the file
111-122 A12 --- SName Simbad name of the galaxy
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Acknowledgements:
Nicola Naon, nicola.caon(at)gmail.com
(End) Patricia Vannier [CDS] 23-Jan-2015