UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

Investigating the Chemical Homogeneity of Low-Metallicity Blue Compact Dwarf Galaxies Using Integral Field Spectroscopy

James, BL; Tsamis, YG; Barlow, MJ; Westmoquette, MS; Walsh, J; Aloisi, A; (2011) Investigating the Chemical Homogeneity of Low-Metallicity Blue Compact Dwarf Galaxies Using Integral Field Spectroscopy. EAS Publications Series , 48 pp. 109-114. 10.1051/eas/1148024. Green open access

[thumbnail of james2011_eas1148024.pdf]
Preview
Text
james2011_eas1148024.pdf - Published Version

Download (327kB) | Preview

Abstract

It has been claimed in the past that in low-metallicity Blue Compact Dwarf (BCDs) galaxies, the N/O value is independent of metallicity (O/H ratio), implying the need to invoke a primary production of nitrogen in intermediate-mass stars, in addition to the secondary nitrogen produced from the CNO cycle in high-mass stars. In order to better understand this controversial issue we undertook an integral field spectroscopic study of the nebular gas within a sample of BCDs previously thought to have anomalously high N/O values. Here we present the results of this study for 3 BCDs: two with anomalous N/O values (Mrk 996 and UM 420) and one with more normal N/O values (UM 462). We describe in detail how we derived the physical conditions (Te, Ne) as a function of position within the galaxy, and as a consequence, how this revealed both revised metallicities and normal N/O ratios and uncovered one of the first clear evidences of nitrogen self-enrichment of an H II  region from WR stars.

Type: Article
Title: Investigating the Chemical Homogeneity of Low-Metallicity Blue Compact Dwarf Galaxies Using Integral Field Spectroscopy
Event: Conference on a Universe of Dwarf Galaxies
Location: Univ Lyon 1, Lyon, FRANCE
Dates: 14 June 2010 - 18 June 2010
ISBN-13: 978-2-7598-0662-1
Open access status: An open access version is available from UCL Discovery
DOI: 10.1051/eas/1148024
Publisher version: https://doi.org/10.1051/eas/1148024
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Astronomy & Astrophysics, VLT VIMOS, ABUNDANCES
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10096445
Downloads since deposit
35Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item