Skip navigation
  • INAF logo
  • Home
  • Communities
    & Collections
  • Research outputs
  • Researchers
  • Organization units
  • Projects
  • Explore by
    • Research outputs
    • Researchers
    • Organization units
    • Projects
  • Login:
    • My DSpace
    • Receive email
      updates
    • Edit Account details
  • Italian
  • English

  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29455
Title: Characterization of star-forming dwarf galaxies at 0.1 ≲z ≲ 0.9 in VUDS: probing the low-mass end of the mass-metallicity relation
Authors: Calabrò, A.
Amorín, R.
FONTANA, Adriano 
Pérez-Montero, E.
Lemaux, B. C.
Ribeiro, B.
BARDELLI, Sandro 
CASTELLANO, MARCO 
Contini, T.
De Barros, S.
GARILLI, BIANCA MARIA ROSA 
GRAZIAN, Andrea 
Guaita, L.
Hathi, N. P.
Koekemoer, A. M.
Le Fèvre, O.
Maccagni, D.
PENTERICCI, Laura 
Schaerer, D.
Talia, M.
Tasca, L. A. M.
ZUCCA, Elena 
Issue Date: 2017
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 601
First Page: A95
Abstract: Context. The study of statistically significant samples of star-forming dwarf galaxies (SFDGs) at different cosmic epochs is essential for the detailed understanding of galaxy assembly and chemical evolution. However, the main properties of this large population of galaxies at intermediate redshift are still poorly known. <BR /> Aims: We present the discovery and spectrophotometric characterization of a large sample of 164 faint (I<SUB>AB</SUB> 23-25 mag) SFDGs at redshift 0.13 ≤ z ≤ 0.88 selected by the presence of bright optical emission lines in the VIMOS Ultra Deep Survey (VUDS). We investigate their integrated physical properties and ionization conditions, which are used to discuss the low-mass end of the mass-metallicity relation (MZR) and other key scaling relations. <BR /> Methods: We use optical VUDS spectra in the COSMOS, VVDS-02h, and ECDF-S fields, as well as deep multi-wavelength photometry that includes HST-ACS F814W imaging, to derive stellar masses, extinction-corrected star-formation rates (SFR), and gas-phase metallicities of SFDGs. For the latter, we use the direct method and a T<SUB>e</SUB>-consistent approach based on the comparison of a set of observed emission lines ratios with the predictions of detailed photoionization models. <BR /> Results: The VUDS SFDGs are compact (median r<SUB>e</SUB> 1.2 kpc), low-mass (M<SUB>∗</SUB> 10<SUP>7</SUP>-10<SUP>9</SUP>M<SUB>☉</SUB>) galaxies with a wide range of star-formation rates (SFR(Hα) 10<SUP>-3</SUP>-10<SUP>1</SUP>M<SUB>☉</SUB>/yr) and morphologies. Overall, they show a broad range of subsolar metallicities (12 +log (O/H) =7.26-8.7; 0.04 ≲Z/Z<SUB>☉</SUB>≲ 1). Nearly half of the sample are extreme emission-line galaxies (EELGs) characterized by high equivalent widths and emission line ratios indicative of higher excitation and ionization conditions. The MZR of SFDGs shows a flatter slope compared to previous studies of galaxies in the same mass range and redshift. We find the scatter of the MZR is partly explained in the low mass range by varying specific SFRs and gas fractions amongst the galaxies in our sample. In agreement with recent studies, we find the subclass of EELGs to be systematically offset to lower metallicity compared to SFDGs at a given stellar mass and SFR, suggesting a younger starburst phase. Compared with simple chemical evolution models we find that most SFDGs do not follow the predictions of a "closed-box" model, but those from a gas-regulating model in which gas flows are considered. While strong stellar feedback may produce large-scale outflows favoring the cessation of vigorous star formation and promoting the removal of metals, younger and more metal-poor dwarfs may have recently accreted large amounts of fresh, very metal-poor gas, that is used to fuel current star formation. <P />Full Tables B.1-B.3 are only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (<A href="http://130.79.128.5">http://130.79.128.5</A>) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/601/A95">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/601/A95
URI: http://hdl.handle.net/20.500.12386/29455
URL: http://arxiv.org/abs/1701.04418v1
https://www.aanda.org/articles/aa/abs/2017/05/aa29762-16/aa29762-16.html
ISSN: 0004-6361
DOI: 10.1051/0004-6361/201629762
Bibcode ADS: 2017A&A...601A..95C
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

Files in This Item:
File Description SizeFormat 
aa29762-16.pdfPdf editoriale4.29 MBAdobe PDFView/Open
Show full item record

Page view(s)

6
checked on Jan 19, 2021

Google ScholarTM

Check

Altmetric


Items in DSpace are published in Open Access, unless otherwise indicated.


Explore by
  • Communities
    & Collections
  • Research outputs
  • Researchers
  • Organization units
  • Projects

Informazioni e guide per autori

https://openaccess-info.inaf.it: tutte le informazioni sull'accesso aperto in INAF

Come si inserisce un prodotto: le guide a OA@INAF

La Policy INAF sull'accesso aperto

Documenti e modelli scaricabili

Feedback
Built with DSpace-CRIS - Extension maintained and optimized by Logo 4SCIENCE