Large-scale environmental dependence of the abundance ratio of nitrogen to oxygen in blue, star-forming galaxies fainter than L*

Abstract

We examine how the cosmic environment affects the chemical evolution of galaxies in the Universe by comparing the N/O ratio of dwarf galaxies in voids with dwarf galaxies in more dense regions. Ratios of the forbidden [O III] and [S II] transitions provide estimates of a region's electron temperature and number density. We estimate the abundances of oxygen and nitrogen using these temperature and density estimates and the emission line fluxes [O II] 3727, [O III] 4959, 5007, and [N II] 6548, 6584 with the direct Te method. Using spectroscopic observations from the Sloan Digital Sky Survey Data Release 7, we are able to estimate the N/O ratio in 42 void dwarf galaxies and 89 dwarf galaxies in more dense regions. The N/O ratio for void dwarfs (Mr > -17) is slightly lower (12%) than for dwarf galaxies in denser regions. We also estimate the nitrogen and oxygen abundances of 2050 void galaxies and 3883 galaxies in more dense regions with Mr > -20. These somewhat brighter galaxies (but still fainter than L*) also display similar minor shifts in the N/O ratio. The shifts in the average and median element abundance values in all absolute magnitude bins studied are in the same direction, suggesting that the large-scale environment may influence the chemical evolution of galaxies. We discuss possible causes of such a large-scale environmental dependence of the chemical evolution of galaxies, including retarded star formation and a higher dark matter halo mass to stellar mass ratio in void galaxies.

arXiv comment17 pages, 14 figures, 2 tables, accepted for publication ApJ (01-2017); corrected declination units

References in corpus (46)

• The chemical composition of the Sun
• On the variation of the Initial Mass Function
• The Seventh Data Release of the Sloan Digital Sky Survey
• The Origin of the Mass--Metallicity Relation: Insights from 53,000 Star-Forming Galaxies in the SDSS
• The physical properties of star forming galaxies in the low redshift universe
• Stellar Masses and Star Formation Histories for 10^5 Galaxies from the Sloan Digital Sky Survey
• Spectroscopic Target Selection in the Sloan Digital Sky Survey: The Main Galaxy Sample
• The Initial Mass Function of Stars: Evidence for Uniformity in Variable Systems
• The Sloan Digital Sky Survey Photometric Camera
• Using Strong Lines to Estimate Abundances in Extragalactic HII Regions and Starburst Galaxies
• How Filaments are Woven into the Cosmic Web
• The chemical composition of metal-poor emission-line galaxies in the Data Release 3 of the Sloan Digital Sky Survey
• An Efficient Algorithm for Positioning Tiles in the Sloan Digital Sky Survey
• The Mass-Metallicity Relation with the Direct Method on Stacked Spectra of SDSS Galaxies
• Heavy element abundances in blue compact galaxies
• On The Cosmic Origins Of Carbon And Nitrogen
• Direct Oxygen Abundances for Low Luminosity LVL Galaxies
• The stellar populations of spiral galaxies
• The impact of the nitrogen-to-oxygen ratio on ionized nebulae diagnostics based on [NII] emission lines
• Evidence for a Non-Uniform Initial Mass Function in the Local Universe
• Cosmic Voids in Sloan Digital Sky Survey Data Release 7
• Voids in the PSCz Survey and the Updated Zwicky Catalog
• Oxygen and Nitrogen in Isolated Dwarf Irregular Galaxies
• The structure of voids
• On the oxygen and nitrogen chemical abundances and the evolution of the "green pea" galaxies
• Evidence for a non-universal stellar initial mass function from the integrated properties of SDSS galaxies
• The Role of Environment in the Mass-Metallicity Relation
• Cosmic Voids: structure, dynamics and galaxies
• The cosmic evolution of oxygen and nitrogen abundances in star-forming galaxies over the past 10 Gyrs
• Metal Abundances of KISS Galaxies III. Nebular Abundances for Fourteen Galaxies and the Luminosity-Metallicity Relationship for HII Galaxies
• Chemical abundances in an UV-selected sample of galaxies
• P-MaNGA: Full spectral fitting and stellar population maps from prototype observations
• Environmentally Driven Global Evolution of Galaxies
• On the Determination of N and O Abundances in Low Metallicity Systems
• The Mass Function of Void Galaxies in the SDSS Data Release 2
• The Void Galaxy Survey: Photometry, structure and identity of void galaxies
• Extremely Metal-Poor Galaxies: The Environment
• Metal-poor dwarf galaxies in the SIGRID galaxy sample. I. HII region observations and chemical abundances
• The metallicity of void dwarf galaxies
• Chemical abundances in spiral and irregular galaxies. O and N abundances derived from global emission--line spectra
• Effects of large-scale environment on the assembly history of central galaxies
• Oxygen and nitrogen abundances in Virgo and field spirals
• HS 2134+0400 - new very metal-poor galaxy, a representative of void population?
• Don't Forget the Forest for the Trees: The Stellar-Mass Halo-Mass Relation in Different Environments
• The N/O Plateau of Blue Compact Galaxies: Monte Carlo Simulations of the Observed Scatter
• Determining the large-scale environmental dependence of gas-phase metallicity in dwarf galaxies

Cited by in corpus (5)

• Updated void catalogs of the SDSS DR7 main sample
• The cosmological star formation history from the Local Cosmological Volume of galaxies and constraints on the matter homogeneity
• The influence of the void environment on the ratio of dark matter halo mass to stellar mass in SDSS MaNGA galaxies
• Influence of the Void Environment on Chemical Abundances in Dwarf Galaxies and Implications for Connecting Star Formation and Halo Mass
• Chemical Abundances of a Sample of Oxygen-dominated Galaxies