scholarly journals Void galaxies in the nearby Universe – I. Sample description

2018 ◽  
Vol 482 (4) ◽  
pp. 4329-4345 ◽  
Author(s):  
S A Pustilnik ◽  
A L Tepliakova ◽  
D I Makarov
Keyword(s):  
Void Galaxies

The Mass Function of Void Galaxies in the Sloan Digital Sky Survey Data Release 2

2005 ◽  
Vol 621 (2) ◽  
pp. 643-650 ◽  
Author(s):  
David M. Goldberg ◽  
Timothy D. Jones ◽  
Fiona Hoyle ◽  
Randall R. Rojas ◽  
Michael S. Vogeley ◽  
...  
Keyword(s):  
Survey Data ◽  
Mass Function ◽  
Sloan Digital Sky Survey ◽  
Sky Survey ◽  
Void Galaxies ◽  
Data Release

scholarly journals XMP gas-rich dwarfs in nearby voids: results of SALT spectroscopy

2020 ◽  
Vol 493 (1) ◽  
pp. 830-846
Author(s):  
S A Pustilnik ◽  
A Y Kniazev ◽  
Y A Perepelitsyna ◽  
E S Egorova
Keyword(s):  
Mass Fraction ◽  
Small Mass ◽  
Empirical Method ◽  
Strong Line ◽  
Large Telescope ◽  
Star Forming ◽  
Void Galaxies ◽  
Semi Empirical ◽  
Baryonic Mass ◽  
Ongoing Project

ABSTRACT In the framework of an ongoing project aimed at searching for and studying eXtremely Metal-Poor (XMP) very gas-rich blue dwarfs in nearby voids, we conducted spectroscopy with the 11-m Southern African Large Telescope (SALT) of 26 candidates, preselected in the first paper of this series (PEPK19). For 23 of them, we detected oxygen lines, allowing us to estimate the gas O/H ratio. For 10 of them, the oxygen abundance is found to be very low, in the range of 12 + log (O/H) = 6.95–7.30 dex. Of those, four void dwarfs have 12 + log (O/H) < 7.19, or Z < Z⊙/30. For the majority of observed galaxies, the faint line [O iii] λ4363 Å used to estimate O/H with the direct Te method appeared either too noisy or was not detected. We therefore use the semi-empirical method of Izotov & Thuan for these spectra, or, when applicable, the new ‘Strong line’ method of Izotov et al. We present and discuss the results for all void dwarfs observed in this work. We also compare their O/H values with O/H values of ∼140 void galaxies available from our recent papers. We address the properties of the newly found unusual void XMP dwarfs and compare them with those for 10 known prototype void XMP objects. The latter small group is outstanding based on their very small mass fraction of stars (only 0.01–0.02 of the baryonic mass), the blue colours of stars in the outer body indicating a non-cosmological age for the main star-forming episode), and the low gas metallicity (several times lower than expected for their luminosity).

scholarly journals SIMULATED VOID GALAXIES IN THE STANDARD COLD DARK MATTER MODEL

2011 ◽  
Vol 735 (2) ◽  
pp. 132 ◽  
Author(s):  
Kathryn Kreckel ◽  
M. Ryan Joung ◽  
Renyue Cen
Keyword(s):  
Dark Matter ◽  
Cold Dark Matter ◽  
Cold Dark Matter Model ◽  
Void Galaxies ◽  
Matter Model ◽  
Dark Matter Model

scholarly journals Properties of simulated galaxies and supermassive black holes in cosmic voids

2020 ◽  
Vol 493 (1) ◽  
pp. 899-921
Author(s):  
Mélanie Habouzit ◽  
Alice Pisani ◽  
Andy Goulding ◽  
Yohan Dubois ◽  
Rachel S Somerville ◽  
...  
Keyword(s):  
Black Holes ◽  
Star Formation ◽  
Star Formation Rate ◽  
Large Fraction ◽  
Formation Rate ◽  
Dark Matter Halo ◽  
Wide Field ◽  
Void Galaxies ◽  
Low Mass ◽  
Cosmic Voids

ABSTRACT Cosmic voids, the underdense regions of the cosmic web, are widely used to constrain cosmology. Voids contain few, isolated galaxies, presumably expected to be less evolved and preserving memory of the pristine Universe. We use the cosmological hydrodynamical simulation Horizon-AGN coupled to the void finder vide to investigate properties of galaxies in voids at z = 0. We find that, closer to void centres, low-mass galaxies are more common than their massive counterparts. At a fixed dark matter halo mass, they have smaller stellar masses than in denser regions. The star formation rate of void galaxies diminishes when approaching void centres, but their specific star formation rate slightly increases, suggesting that void galaxies form stars more efficiently with respect to their stellar mass. We find that this cannot only be attributed to the prevalence of low-mass galaxies. The inner region of voids also predominantly hosts low-mass black holes (BHs). However, the BH mass-to-galaxy mass ratios resemble those of the whole simulation at z = 0. Our results suggest that even if the growth channels in cosmic voids are different from those in denser environments, voids grow their galaxies and BHs in a similar way. While a large fraction of the BHs have low Eddington ratios, we find that $\text{$\sim$} 20{{\ \rm per\ cent}}$ could be observed as active galactic nuclei with $\log _{10} L_{\rm 2\!-\!10 \, keV}=41.5\!-\!42.5 \, \rm erg\, s^{-1}$. These results pave the way to future work with larger next-generation hydro-simulations, aiming to confirm our findings and prepare the application on data from upcoming large surveys such as Prime Focus Spectrograph, Euclid, and Wide Field Infrared Survey Telescope.

scholarly journals THE OPTICAL LUMINOSITY FUNCTION OF VOID GALAXIES IN THE SDSS AND ALFALFA SURVEYS

2015 ◽  
Vol 810 (2) ◽  
pp. 108 ◽  
Author(s):  
Crystal M. Moorman ◽  
Michael S. Vogeley ◽  
Fiona Hoyle ◽  
Danny C. Pan ◽  
Martha P. Haynes ◽  
...  
Keyword(s):  
Luminosity Function ◽  
Void Galaxies

scholarly journals The many assembly histories of massive void galaxies as revealed by integral field spectroscopy

2016 ◽  
Vol 459 (1) ◽  
pp. 754-770 ◽  
Author(s):  
Amelia Fraser-McKelvie ◽  
Kevin A. Pimbblet ◽  
Samantha J. Penny ◽  
Michael J. I. Brown
Keyword(s):  
Integral Field Spectroscopy ◽  
Field Spectroscopy ◽  
Void Galaxies ◽  
The Many ◽  
Integral Field

scholarly journals The Luminosity Function of Void Galaxies in the Sloan Digital Sky Survey

2005 ◽  
Vol 620 (2) ◽  
pp. 618-628 ◽  
Author(s):  
Fiona Hoyle ◽  
Randall R. Rojas ◽  
Michael S. Vogeley ◽  
Jon Brinkmann
Keyword(s):  
Luminosity Function ◽  
Sloan Digital Sky Survey ◽  
Sky Survey ◽  
Void Galaxies

scholarly journals ON THE STAR FORMATION PROPERTIES OF VOID GALAXIES

2016 ◽  
Vol 831 (2) ◽  
pp. 118 ◽  
Author(s):  
Crystal M. Moorman ◽  
Jackeline Moreno ◽  
Amanda White ◽  
Michael S. Vogeley ◽  
Fiona Hoyle ◽  
...  
Keyword(s):  
Star Formation ◽  
Void Galaxies

scholarly journals XMP gas-rich dwarfs in nearby voids: candidate selection

2019 ◽  
Vol 492 (1) ◽  
pp. 1078-1090 ◽  
Author(s):  
S A Pustilnik ◽  
E S Egorova ◽  
Y A Perepelitsyna ◽  
A Y Kniazev
Keyword(s):  
Candidate Selection ◽  
Model Simulations ◽  
Study Results ◽  
Void Galaxies ◽  
The Galaxy ◽  
Galaxy Population

ABSTRACT We introduce a project aimed at systematically searching for eXtremely Metal-Poor (XMP) very gas-rich blue dwarfs in voids in the nearby Universe. Several such galaxies were first identified in the course of an unbiased study of the galaxy population in the nearby Lynx-Cancer void. These very rare and unusual galaxies appear to be the best proxies for the so-called Very Young Galaxies defined recently in the model simulations by Tweed et al. (2018). We discuss the main properties of 10 prototype objects residing in nearby voids and formulate criteria to search for similar dwarfs in other voids. The recently published sample of 1354 Nearby Void Galaxies is used to identify a subsample of 60 void dwarf XMP candidates. We provide a list of these XMP candidates with their main parameters and finding charts. These candidates are the subjects of subsequent spectral, photometric, and H i studies in the accompanying papers. Looking ahead, with reference to the submitted accompanying papers, we find that this study results in the discovery of many new XMP dwarfs with 12+log (O/H) ∼ 7.0–7.3 dex.

scholarly journals Nearby void dwarf galaxies: recent results, the ongoing project and prospects

2018 ◽  
Vol 14 (S344) ◽  
pp. 396-399
Author(s):  
Simon A. Pustilnik ◽  
Dmitri I. Makarov ◽  
Arina L. Tepliakova
Keyword(s):  
Fine Structure ◽  
Systematic Study ◽  
Dwarf Galaxies ◽  
Statistical Properties ◽  
Local Volume ◽  
Void Galaxies ◽  
Luminous Galaxies ◽  
Galaxy Sample ◽  
Low Mass ◽  
Ongoing Project

AbstractProperties of dwarf galaxies formed and evolved in the lowest density environment remain largely unexplored and poorly understood. Especially this concerns the low-mass end (Mbar < 109M⊙). We overview the results of systematic study of a hundred void dwarfs from the nearby Lynx-Cancer void. We describe the ongoing project aiming to form Nearby Void galaxy sample (R < 25 Mpc) over the whole sky. 1354 objects with distances less than 25 Mpc fall within 25 voids delineated by 460 luminous galaxies/groups. The void major sizes range from 13 to 37 Mpc. 1088 of 1354 void galaxies reside deeply in voids, having distances to the nearest luminous neighbour of 2–11 Mpc. 195 nearest void galaxies reside in the Local Volume. We summarize the main statistical properties of the new sample and outline the prospects of study of both, the void dwarf properties and the fine structure of voids.

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