========================================================================== J/A+A/533/A91 Stellar structures in outer regions of M33 (Grossi+, 2011) The following files can be converted to FITS (extension .fit or fit.gz) table1.dat bg.dat nw*.dat se*.dat ========================================================================== Query from: http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=J/A+A/533/A91 ==========================================================================
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Beginning of ReadMe : J/A+A/533/A91 Deep VI imaging in outer regions of M33 (Grossi+, 2011) ================================================================================ Stellar structures in the outer regions of M33. Grossi M., Hwang N., Corbelli E., Giovanard C., Okamoto S., Arimoto N. <Astron. Astrophys. 533, A91 (2011)> =2011A&A...533A..91G ================================================================================ ADC_Keywords: Galaxies, nearby ; Galaxies, photometry ; Photometry, CCD Keywords: galaxies: evolution - galaxies: stellar content - galaxies: halos - galaxies: individual: M33 Abstract: We present Subaru/Suprime-Cam deep V and I imaging of seven fields in the outer regions of M33. Our aim is to search for stellar structures corresponding to extended HI clouds found in a recent 21-cm survey of the galaxy. Three fields probe a large HI complex to the southeastern (SE) side of the galaxy. An additional three fields cover the northwestern (NW) side of the galaxy along the HI warp. A final target field was chosen further north, at a projected distance of approximately 25kpc, to study part of the large stellar plume recently discovered around M33. We analyse the stellar population at R>10kpc by means of V, I colour magnitude diagrams reaching the red clump. We constrain the age and metallicity of the different stellar populations, search for density enhancements that correspond to the HI features, and investigate the radial surface distribution of the stars. We find evolved stellar populations in all fields out to 120' ( 30kpc), while a diffuse population of young stars ( 200Myr) is detected out to a galactocentric radius of 15kpc. The mean metallicity in the southern fields remains approximately constant at [M/H]=-0.7 beyond the edge of the optical disc, from 40' out to 80'. Along the northern fields probing the outer HI disc, we also find a metallicity of [M/H]=-0.7 between 35' and 70' from the centre, which decreases to [M/H]=-1.0 at larger angular radii out to 120'. In the northernmost field, outside the disc extent, the stellar population of the large stellar plume possibly related to a M33-M31 interaction is on average more metal-poor ([M/H]=-1.3) and older (>6Gyr). An exponential disc with a large scale-length ( 7kpc) fits well the average distribution of stars detected in both the SE and NW regions from a galactocentric distance of 11kpc out to 30kpc. The stellar disc extends beyond the HI disc. The stellar distribution at large radii is disturbed and, although there is no clear correlation between the stellar substructures and the location of the HI clouds, this gives evidence of tidal interaction or accretion events. Description: V,I stellar photometry in seven fields in the outer regions of M33 corresponding to extended neutral hydrogen clouds found in a recent 21-cm survey of the galaxy. The fields are named as SE1, SE2, SE3, NW4, NW5, NW6, NW7. An additional field named BG at approximately four degrees to the east of the optical centre of M33 was selected to inspect the contamination from background and foreground sources. For each field X, Y position in the V and I frames, equatorial coordinates, V, I magnitudes and corresponding errors are given. The colour magnitude diagrams obtained with this photometry are shown in Figures 2, 3 and 4.