On the Star Formation Properties of Void Galaxies

Moorman, Crystal M.; Moreno, Jackeline; White, Amanda J.; Vogeley, Michael S.; Hoyle, F.; Giovanelli, Riccardo; Haynes, Martha P.

doi:10.3847/0004-637x/831/2/118

Cited by 47 publications

(40 citation statements)

References 55 publications

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“…However, when exploring whether or not the local environment has an impact on the star-formation properties of galaxies, one must carefully control for these population differences. In studies where the properties of the non-void comparison sample were matched to those of the void sample (e.g., similar colors, masses, gas content), quantities like sSFR were found to be similar across environments (e.g., Patiri et al 2006;Ricciardelli et al 2014;Moorman et al 2016). The results of these latter studies are in good agreement with our findings.…”

Section: Discussionsupporting

confidence: 90%

Metal Abundances and Star Formation Rates of Emission-line Galaxies in and around the Boötes Void

Wegner

Salzer

Taylor

et al. 2019

ApJ

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We explore the possible dependencies of galaxy metal abundance and star-formation rate (SFR) on local environment, focusing on the volume of space in and around the Boötes Void. Our sample of starforming galaxies comes from the second catalog of the Hα-selected KPNO International Spectroscopic Survey (KISS) which overlaps the void. This sample represents a statistically complete, line-fluxlimited ensemble of 820 star-forming galaxies, all of which possess metallicity and SFR estimates. We carry out two distinct analyses of the KISS galaxies: one which probes the properties of the entire sample as a function of local density, and a second which details the properties of 33 KISS star-forming galaxies located within the Boötes Void. In both cases we find no evidence that either the metallicity of the KISS galaxies or their SFRs depend on the environments within which the galaxies are located. Our global analysis does show weak trends for decreasing stellar mass, decreasing metallicity, and decreasing SFRs with decreasing local densities. However, we argue that the metallicity and SFR trends are artifacts of the stellar mass -local density trend. In particular, the change in metallicity with density is precisely what one would predict from the mass-metallicity relation given the observed drop in stellar mass with decreasing metallicity. Likewise, the SFR trend with density disappears when one instead considers the mass-normalized specific SFR. The KISS galaxies dwelling in the Boötes Void are found to have nearly identical metallicity and SFR properties to a matched comparison sample, despite the fact that the former are located in density environments that are, on average, more than 16 times lower.

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Section: Discussionsupporting

confidence: 90%

Metal Abundances and Star Formation Rates of Emission-line Galaxies in and around the Boötes Void

Wegner

Salzer

Taylor

et al. 2019

ApJ

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“…This is because the external accretion of gas may have, in part, built its young nuclear region. The observation that a lower fraction of ordinary ETGs in clusters, than compared to isolated ETGs, are blue and star-forming (Lacerna et al 2016, see also Collobert et al 2006) reflects this and reveals a greater abundance of cold molecular gas in the field galaxies (see also Moorman et al 2016). Accretion of gas in CG 611 is apparent from the counter rotation of the gas relative to most of the stars, and from the non-symmetrical nature of the gas rotation curve about the photometric center of the galaxy (Figure 6).…”

Section: Cg 611mentioning

confidence: 94%

Implications for the Origin of Early-type Dwarf Galaxies: A Detailed Look at the Isolated Rotating Early-type Dwarf Galaxy LEDA 2108986 (CG 611), Ramifications for the Fundamental Plane’s Kinematic Scaling, and the Spin–Ellipticity Diagram

Graham

Janz

Penny

et al. 2017

ApJ

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Selected from a sample of nine, isolated, dwarf early-type galaxies (ETGs) with the same range of kinematic properties as dwarf ETGs in clusters, we use LEDA 2108986 (CG 611) to address the Nature versus Nurture debate regarding the formation of dwarf ETGs. The presence of faint disk structures and rotation within some cluster dwarf ETGs has often been heralded as evidence that they were once late-type spiral or dwarf irregular galaxies prior to experiencing a cluster-induced transformation into an ETG. However, CG 611 also contains significant stellar rotation (≈20 km s −1 ) over its inner half-light radius (R e,maj = 0.71 kpc), and its stellar structure and kinematics resemble those of cluster ETGs. In addition to hosting a faint young nuclear spiral within a possible intermediate-scale stellar disk, CG 611 has accreted an intermediate-scale, counter-rotating gas disk. It is therefore apparent that dwarf ETGs can be built by accretion events, as opposed to disk-stripping scenarios. We go on to discuss how both dwarf and ordinary ETGs with intermediate-scale disks, whether under (de)construction or not, are not fully represented by the kinematic scaling S 0.5 = 0.5 V 2 rot + σ 2 , and we also introduce a modified spin-ellipticity diagram λ(R)-(R) with the potential to track galaxies with such disks.

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“…In models where the distribution of dark matter in central regions of the galaxy is driven by stellar feedback processes (e.g. Pontzen & Governato 2012;), void galaxies, with their typically higher star formation rates (Moorman et al 2016) could be more affected by such baryonic processes as compared to galaxies in high density regions. This paper is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

Mass models of gas-rich void dwarf galaxies

Kurapati

Chengalur

Kamphuis

et al. 2019

Monthly Notices of the Royal Astronomical Society

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We construct mass models of eight gas rich dwarf galaxies that lie in the Lynx-Cancer void. From NFW fits to the dark matter halo profile, we find that the concentration parameters of halos of void dwarf galaxies are similar to those of dwarf galaxies in normal density regions. We also measure the slope of the central dark matter density profiles, obtained by converting the rotation curves derived using 3-D (fat ) and 2-D (ROTCUR) tilted ring fitting routines, into mass densities. We find that the average slope (α = −1.39 ± 0.19), obtained from 3-D fitting is consistent with that expected from an NFW profile. On the other hand, the average slope measured using the 2-D approach is closer to what would be expected for an isothermal profile. This suggests that systematic effects in velocity field analysis have a significant effect on the slope of the central dark matter density profiles. Given the modest number of galaxies we use for our analysis, it is important to check these results using a larger sample.

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On the Star Formation Properties of Void Galaxies

Cited by 47 publications

References 55 publications

Metal Abundances and Star Formation Rates of Emission-line Galaxies in and around the Boötes Void

Metal Abundances and Star Formation Rates of Emission-line Galaxies in and around the Boötes Void

Implications for the Origin of Early-type Dwarf Galaxies: A Detailed Look at the Isolated Rotating Early-type Dwarf Galaxy LEDA 2108986 (CG 611), Ramifications for the Fundamental Plane’s Kinematic Scaling, and the Spin–Ellipticity Diagram

Mass models of gas-rich void dwarf galaxies

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