Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-06-08
Mon.Not.Roy.Astron.Soc. 352 (2004) L6
Astronomy and Astrophysics
Astrophysics
5 pages, 5 figures, accepted for publication in MNRAS Letters. Figure 1 substantially degraded, full resolution version availa
Scientific paper
10.1111/j.1365-2966.2004.08106.x
We analyse the detailed structure of a highly-inclined (i>~80 degrees) disc galaxy which lies within the Hubble Ultra Deep Field (UDF). The unprecedented depth of the UDF data allow disc and extraplanar emission to be reliably traced to surface brightness levels of mu_{V,i,z}~29-30 mag/arcsec^2 (corresponding to rest-frame equivalents of mu_{g,r,i}~28-29 mag/arcsec^2) in this redshift z=0.32 system. We detect excess emission above the disc which is characterised by a moderately-flattened (b/a~0.6) power-law (I proportional to R^(-2.6)). The structure and colour of this component are very similar to the stellar halo detected in an SDSS stacking analysis of local disc galaxies (Zibetti, White and Brinkmann 2004) and lend support to the idea that we have detected a stellar halo in this distant system. Although the peculiar colours of the halo are difficult to understand in terms of normal stellar populations, the consistency found between the UDF and SDSS analyses suggests that they cannot be easily discounted.
Ferguson Annette M. N.
Zibetti Stefano
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