Direct imaging of haloes and truncations in face-on nearby galaxies

J. H. Knapen, S. P. C. Peters, P. C. van der Kruit, I. Trujillo, J. Fliri, M. Cisternas, L. S. Kelvin, A. Bragaglia, M. Arnaboldi, M. Rejkuba, D. Romano

OnderzoeksoutputAcademicpeer review

Samenvatting

We use ultra-deep imaging from the IAC Stripe 82 Legacy Project to study the surface photometry of 22 nearby, face-on to moderately inclined spiral galaxies. The reprocessed and co-added SDSS/Stripe 82 imaging allows us to probe down to 29-30 r'-mag/arcsec2 and thus reach into the very faint outskirts of the galaxies. We find extended stellar haloes in over half of our sample galaxies, and truncations in three of them. The presence of stellar haloes and truncations is mutually exclusive, and we argue that the presence of a stellar halo can hide a truncation. We find that the onset of the halo and the truncation scales tightly with galaxy size. We highlight the importance of a proper analysis of the extended wings of the point spread function (PSF), finding that around half the light at the faintest levels is from the inner regions of a galaxy, though not the nucleus, re-distributed to the outskirts by the PSF. We discuss implications of this effect for future deep imaging surveys, such as with the LSST.
Originele taal-2English
TitelThe General Assembly of Galaxy Halos
SubtitelStructure, Origin and Evolution, Proceedings of the International Astronomical Union, IAU Symposium
UitgeverijIAU
Pagina's39-44
Aantal pagina's6
Volume22
DOI's
StatusPublished - 2016
EvenementIAUS 317: The General Assembly of Galaxy Halos: Structure, Origin and Evolution - Honolulu, United States
Duur: 3-aug-20157-aug-2015

Conference

ConferenceIAUS 317: The General Assembly of Galaxy Halos: Structure, Origin and Evolution
Land/RegioUnited States
StadHonolulu
Periode03/08/201507/08/2015

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