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J/MNRAS/460/30      gi photometry of Sextans dSph galaxy stars (Roderick+, 2016)

Structural analysis of the Sextans dwarf spheroidal galaxy. Roderick T.A., Jerjen H., Da Costa G.S., Mackey A.D. <Mon. Not. R. Astron. Soc., 460, 30-43 (2016)> =2016MNRAS.460...30R (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; Photometry, SDSS Keywords: galaxies: dwarf - galaxies: evolution - galaxies: fundamental parameters - galaxies: individual: Sextans Abstract: We present wide-field g- and i-band stellar photometry of the Sextans dwarf spheroidal galaxy and its surrounding area out to four times its half-light radius (rh=695pc), based on images obtained with the Dark Energy Camera at the 4-m Blanco telescope at CTIO. We find clear evidence of stellar substructure associated with the galaxy, extending to a distance of 82-arcmin (2kpc) from its centre. We perform a statistical analysis of the overdensities and find three distinct features, as well as an extended halo-like structure, to be significant at the 99.7 per cent confidence level or higher. Unlike the extremely elongated and extended substructures surrounding the Hercules dwarf spheroidal galaxy, the overdensities seen around Sextans are distributed evenly about its centre, and do not appear to form noticeable tidal tails. Fitting a King model to the radial distribution of Sextans stars yields a tidal radius rt=83.2-arcmin±7.1 arcmin (2.08±0.18kpc), which implies the majority of detected substructure is gravitationally bound to the galaxy. This finding suggests that Sextans is not undergoing significant tidal disruption from the Milky Way, supporting the scenario in which the orbit of Sextans has a low eccentricity. Description: Observations were conducted on 2013 February 15 using DECam at the CTIO 4-m Blanco telescope, as part of observing proposal 2013A-0617 (PI: D. Mackey). The total DECam field-of-view is 3 deg2, formed by a hexagonal mosaic of 62 2Kx4K CCDs, each with a pixel scale of 0.27arcsec/pixel. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file fig13.dat 100 6191 Catalogue of all stars corresponding to the spatial distribution of overdensities in Fig. 13
See also: J/A+A/566/A44 : gr photometry of Sextans A and Sextans B (Bellazzini+, 2014) Byte-by-byte Description of file: fig13.dat
Bytes Format Units Label Explanations
1- 24 E24.19 deg RAdeg Right ascension (J2000) 26- 50 E25.19 deg DEdeg Declination 52- 75 E24.19 mag gmag g magnitude 77-100 E24.19 mag imag i magnitude
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 29-Sep-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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