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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 660607.0, MPI für Astronomie / Publikationen_mpia
Spatially resolved properties of the grand-design spiral galaxy UGC 9837: a case for high-redshift 2-D observations
Authors:Viironen, K.; Sánchez, S. F.; Marmol-Queraltó, E.; Iglesias-Páramo, J.; Mast, D.; Marino, R. A.; Cristóbal-Hornillos, D.; Gil de Paz, A.; van de Ven, G.; Vilchez, J.; Wisotzki, L.
Date of Publication (YYYY-MM-DD):2012
Title of Journal:Astronomy and Astrophysics
Journal Abbrev.:A & A
Volume:538
Start Page:id.A144
Review Status:not specified
Audience:Not Specified
Abstract / Description:Context. We carry out a detailed 2-D study of the ionised gas in the local universe galaxy UGC 9837. In nearby galaxies, like the galaxy in question here, the spatial distribution of the physical properties can be studied in detail, providing benchmarks for galaxy formation models. <BR /> Aims: Our aim is to derive detailed and spatially resolved physical properties of the ionised gas of UGC 9837. In addition, we derive an integrated spectrum of the galaxy and study how varying spatial coverage affects the derived integrated properties. We also study how the same properties would be seen if the galaxy was placed at a higher redshift and observed as part of one of the high-z surveys. <BR /> Methods: UGC 9837 was observed using the PMAS PPAK integral-field unit. The spectra were reduced and calibrated and the stellar and ionised components separated. Using strong emission line ratios of the ionised gas, the source of ionisation, the dust extinction, the star formation rate, the electron density, and the oxygen abundance derived from a total integrated spectrum, central integrated spectrum, and individual fibre spectra are studied. Finally, the same properties are studied in a spectrum whose spatial resolution is degraded to simulate high-z observations. <BR /> Results: The spatial distribution of the ionised gas properties is consistent with inside-out growing scenario of galaxies. We also find that lack of spatial coverage would bias the results derived from the integrated spectrum leading, e.g., to an underestimation of ionisation and overestimation of metallicity, if only the centre of the galaxy was covered by the spectrum. Our simulation of high-z observations shows that part of the spatial information, such as dust and SFR distribution would be lost, while shallower gradients in metallicity and ionisation strength would be detected.
Free Keywords:galaxies: individual: UGC 9837; galaxies: abundances; galaxies: stellar content; techniques: spectroscopic; stars: formation
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://cdsads.u-strasbg.fr/abs/2012A%26A...538A.14... [ID No:1]
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