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J/A+A/610/A8          NGC3447/NGC3447A maps                      (Mazzei+, 2018)

Galaxy evolution in groups. NGC3447/NGC3447A: the odd couple in LGG 225. Mazzei P., Marino A., Rampazzo R., Plana H., Rosado M., Arias L. <Astron. Astrophys. 610, A8 (2018)> =2018A&A...610A...8M (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; Radial velocities ; Photometry, H-alpha Keywords: galaxies: groups: individual: LGG 225 - galaxies: individual: NGC 3447/NGC 3447A - galaxies: interactions - galaxies: kinematics and dynamics - galaxy: photometry - galaxies: evolution Abstract: Local Group (LG) Analogs (LGAs) are galaxy associations dominated by a few bright spirals reminiscent of the LG. The NGC3447/NGC3447A system is a member of the LGG 225 group, a nearby LGA. This system is considered a physical pair composed of an intermediate-luminosity late-type spiral, NGC3447 itself, and an irregular companion, NGC3447A, linked by a faint, short filament of matter. A ring-like structure in the NGC3447 outskirts has been emphasised by Galaxy Evolution Explorer (GALEX) observations. This work aims to contribute to the study of galaxy evolution in low-density environments, a favourable habitat to highly effective encounters, shedding light on the evolution of the NGC3447/NGC3447A system. We performed a multi-λ analysis of the surface photometry of this system to derive its spectral energy distribution and structural properties using ultraviolet (UV), Swift UVOT, and optical Sloan Digital Sky Survey (SDSS) images complemented with available far-IR observations. We also characterised the velocity field of the pair using two-dimensional Hα kinematical observations of the system obtained with PUMA Fabry-Perot interferometer at the 2.1m telescope of San Pedro Martir (Mexico). All these data are used to constrain smooth particle hydrodynamic simulations with chemo-photometric implementation to shed light on the evolution of this system. The luminosity profiles, from UV to optical wavelengths, are all consistent with the presence of a disc extending and including NGC3447A. The overall velocity field does not emphasise any significant rotation pattern, rather a small velocity gradient between NGC3447 and NGC3447A. Our simulation, detached from a large grid explored to best-fit the global properties of the system, suggests that this arises from an encounter between two halos of equal mass. Description: Observations were carried out with the PUMA Fabry-Perot (FP, hereafter) interferometer at the 2.1m telescope of the Observatorio Astronomico Nacional at San Pedro Martir (OAN-SPM) Baja California, Mexico, (PUMA@2.1-mSPM) on March 13, 2013. The PUMA instrument is formed by a Queensgate ET50 etalon in the pupil of a focal reducer with the Marconi2 2Kx2K CCD detector as receptor. Marconi has a physical pixel size of 13um and a scale on the sky of 0.33"/pix. We performed 4x4 spatial binning giving a pixel equivalent of 1.3" on the sky. Objects: -------------------------------------------------------- RA (2000) DE Designation(s) -------------------------------------------------------- 10 53 23.98 +16 46 20.7 NGC3447/NGC3447A = NGC 3447 -------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file list.dat 121 4 List of fits files fits/* 0 4 Individual fits files
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 I3 --- Nx Number of pixels along X-axis 24- 26 I3 --- Ny Number of pixels along Y-axis 28- 29 I2 --- Nz ? Number of slices 31- 37 F7.3 km/s bVel ? Lower value of velocity interval for the datacube 39- 45 F7.2 km/s BVel ? Upper value of velocity interval for the datacube 47- 52 F6.3 km/s dVel ? Velocity resolution for the datacube 54- 58 I5 Kibyte size Size of FITS file 60- 80 A21 --- FileName Name of FITS file, in subdirectory fits 82-121 A40 --- Title Title of the FITS file
Acknowledgements: Paola Mazzei, paola.mazzei(at)oapd.inaf.it
(End) Patricia Vannier [CDS] 24-Oct-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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