J/A+A/581/A65           IFU observations of NGC 4191        (Coccato+, 2015)

Properties and formation mechanism of the stellar counter-rotating components in NGC 4191. Coccato L., Fabricius M., Morelli L., Corsini E.M., Pizzella A., Erwin P., Dalla Bonta E., Saglia R., Bender R., Williams M. <Astron. Astrophys. 581, A65 (2015)> =2015A&A...581A..65C 2015A&A...581A..65C
ADC_Keywords: Galaxies, optical ; Spectroscopy Keywords: galaxies: abundances - galaxies: kinematics and dynamics - galaxies: formation - galaxies: stellar content - galaxies: individual: NGC 4191 Abstract: We here distinguish two counter-rotating stellar components in NGC 4191 and characterize their physical properties such as kinematics, size, morphology, age, metallicity. We obtained integral field spectroscopic observations with VIRUS-W and used a spectroscopic decomposition technique to separate the contribution of two stellar components to the observed galaxy spectrum. We also performed a photometric decomposition, modeling the galaxy with a Sersic bulge and two exponential disks of different scale length, with the aim of associating these structural components with the kinematic components. We then measured the equivalent width of the absorption line indices on the best-fit models that represent the kinematic components and compared our measurements to the predictions of stellar population models that also account for the variable abundance ratio of α elements. Description: The observations of NGC 4191 were carried on 1-3 and 6-7 April 2013 using the VIRUS-W Integral Field Unit (IFU) Spectrograph at the 2.7m Harlan J. Smith Telescope of the McDonald Observatory (Texas, US). The observations were dithered to fill the entire field of view. We took six exposures of 1800s in each of the three dither positions and bracketed and interleaved them with 300s sky nods. Objects: ------------------------------------------------- RA (2000) DE Designation(s) ------------------------------------------------- 12 13 50.38 +07 12 03.0 NGC 4191 = UGC 7233 ------------------------------------------------- File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file list.dat 73 1 Information on fits datacube mfNGC4191.fits 2880 24481 Fits data cube -------------------------------------------------------------------------------- Byte-by-byte Description of file: list.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 9 F9.5 deg RAdeg Right Ascension of center (J2000) 10- 18 F9.5 deg DEdeg Declination of center (J2000) 20- 22 F3.1 arcsec/pix Scale [1.6] Scale of the image 24- 25 I2 --- Nx [70] Number of pixels along X-axis 27- 28 I2 --- Ny [38] Number of pixels along Y-axis 30- 33 I4 --- Nz [3313] Number of slices 35- 39 I5 Kibyte size [68856] Size of FITS file 41- 54 A14 --- FileName Name of FITS file 56- 73 A18 --- Title Title of the FITS file -------------------------------------------------------------------------------- Acknowledgements: Lodovico Coccato, lcoccato(at)eso.org
(End) Patricia Vannier [CDS] 02-Sep-2015
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