English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/210717
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Title

TheEDGE-CALIFA survey: using optical extinction to probe the spatially resolved distribution of gas in nearby galaxies

AuthorsBarrera-Ballesteros, Jorge K.; Utomo, Dyas; Bolatto, Alberto D.; Sánchez, Sebastián F. ; Vogel, Stuart N.; Wong, Tony; Levy, Rebecca C.; Colombo, Dario; Kalinova, Veselina; Teuben, Peter; García-Benito, Rubén ; Husemann, Bernd; Mast, Damián ; Blitz, Leo
KeywordsGalaxies: evolution
Galaxies: ISM
ISM: molecules
Issue Date2020
PublisherOxford University Press
CitationMonthly Notices of the Royal Astronomical Society 492: 2651-2662 (2019)
AbstractWe present an empirical relation between the cold gas surface density (Σgas) and the optical extinction (AV) in a sample of 103 galaxies from the Extragalactic Database for Galaxy Evolution (EDGE) survey. This survey provides CARMA interferometric CO observations for 126 galaxies included in the Calar Alto Legacy Integral Field Area (CALIFA) survey. The matched, spatially resolved nature of these data sets allows us to derive the Σgas-AV relation on global, radial, and kpc (spaxel) scales. We determine AV from the Balmer decrement (H α/H β). We find that the best fit for this relation is Σgas (M☉ pc−2) ∼ 26 × AV (mag), and that it does not depend on the spatial scale used for the fit. However, the scatter in the fits increases as we probe smaller spatial scales, reflecting the complex relative spatial distributions of stars, gas, and dust. We investigate the Σgas/AV ratio on radial and spaxel scales as a function of EW(H α). We find that at larger values of EW(H α ) (i.e. actively star-forming regions) this ratio tends to converge to twice the value expected for a foreground dust screen geometry (∼30 M☉ pc−2 mag−1). On radial scales, we do not find a significant relation between the Σgas/AV ratio and the ionized gas metallicity. We contrast our estimates of Σgas using AV with compilations in the literature of the gas fraction on global and radial scales as well as with well-known scaling relations such as the radial star formation law and the Σgas-Σ∗ relation. These tests show that optical extinction is a reliable proxy for estimating Σgas in the absence of direct sub/millimeter observations of the cold gas. © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
Publisher version (URL)http://dx.doi.org/10.1093/mnras/stz3553
URIhttp://hdl.handle.net/10261/210717
DOI10.1093/mnras/stz3553
ISSN0035-8711
Appears in Collections:(IAA) Artículos
Files in This Item:
File Description SizeFormat 
IAA_2020stz3553.pdf10,92 MBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.