RESOLVING IONIZATION and METALLICITY on PARSEC SCALES ACROSS MRK 71 with HST-WFC3
dc.contributor.author | James, Bethan | |
dc.contributor.author | Auger, Matthew | |
dc.contributor.author | Aloisi, Alessandra | |
dc.contributor.author | Calzetti, Daniela | |
dc.contributor.author | Kewley, Lisa | |
dc.date.accessioned | 2018-11-29T22:52:38Z | |
dc.date.available | 2018-11-29T22:52:38Z | |
dc.date.issued | 2016 | |
dc.date.updated | 2018-11-29T07:47:25Z | |
dc.description.abstract | Blue compact dwarf (BCD) galaxies in the nearby universe provide a means for studying feedback mechanisms and star formation processes in low-metallicity environments in great detail. Owing to their vicinity, these local analogs to primordial young galaxies are well suited for high-resolution studies that are unfeasible for high-redshift galaxies. Here we present Hubble Space Telescope Wide Field Camera 3 observations of one such BCD, Mrk 71, one of the most powerful local starbursts known, in the light of [O ii], He ii, Hβ, [O iii], Hα, and [S ii]. At D sime 3.44 Mpc, this extensive suite of emission-line images enables us to explore the chemical and physical conditions of Mrk 71 on ~2 pc scales. We use emission-line diagnostics to distinguish ionization mechanisms on a pixel-by-pixel basis and show that despite the previously reported hypersonic gas and superbubble blowout, the gas in Mrk 71 is photoionized, with no sign of shock-excited emission. He ii emission line images are used to identify up to six Wolf-Rayet stars, three of which lie on the edge of a blowout region. Using strong-line metallicity diagnostics, we present the first "metallicity image" of a galaxy, revealing chemical inhomogeneity on scales of <50 pc. We additionally demonstrate that while chemical structure can be lost at large scales, metallicity diagnostics can break down on spatial scales smaller than an H ii region. This study highlights not only the benefits of high-resolution spatially resolved observations in assessing the effects of feedback mechanisms but also the potential limitations when employing emission-line diagnostics; these results are particularly relevant as we enter the era of extremely large telescopes. | |
dc.format.mimetype | application/pdf | en_AU |
dc.identifier.issn | 0004-637X | |
dc.identifier.uri | http://hdl.handle.net/1885/152231 | |
dc.publisher | IOP Publishing | |
dc.source | The Astrophysical Journal | |
dc.title | RESOLVING IONIZATION and METALLICITY on PARSEC SCALES ACROSS MRK 71 with HST-WFC3 | |
dc.type | Journal article | |
dcterms.accessRights | Open Access | en_AU |
local.bibliographicCitation.issue | 1 | |
local.contributor.affiliation | James, Bethan, Cambridge University | |
local.contributor.affiliation | Auger, Matthew, University of Cambridge | |
local.contributor.affiliation | Aloisi, Alessandra, Space Telescope Science Institute | |
local.contributor.affiliation | Calzetti, Daniela, University of Massachusetts | |
local.contributor.affiliation | Kewley, Lisa, College of Science, ANU | |
local.contributor.authoremail | u9415124@anu.edu.au | |
local.contributor.authoruid | Kewley, Lisa, u9415124 | |
local.description.notes | Imported from ARIES | |
local.identifier.absfor | 020100 - ASTRONOMICAL AND SPACE SCIENCES | |
local.identifier.absseo | 970102 - Expanding Knowledge in the Physical Sciences | |
local.identifier.ariespublication | U3488905xPUB8298 | |
local.identifier.citationvolume | 816 | |
local.identifier.doi | 10.3847/0004-637X/816/1/40 | |
local.identifier.scopusID | 2-s2.0-84952803091 | |
local.identifier.thomsonID | 000368225100040 | |
local.identifier.uidSubmittedBy | U3488905 | |
local.type.status | Published Version |
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