Void galaxies in the nearby Universe – I. Sample description

Pustilnik, S. A.; Tepliakova, A. L.; Макаров, Д. И.

doi:10.1093/mnras/sty2947

Cited by 30 publications

(30 citation statements)

References 99 publications

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“…Sparse filaments of dwarf galaxies can snake through regions devoid of bright galaxies. This phenomenon has particularly been noted by Lindner et al (1995) and Pustilnik et al (2019) within the volume that attracts our attention. The linkage of the region under consideration including the Local Void to very extensive voids has been claimed by .…”

Section: Morphologies Of Nearest Voidssupporting

confidence: 67%

Cosmicflows-3: Cosmography of the Local Void

Tully

Pomarede

Graziani

et al. 2019

ApJ

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Cosmicflows-3 distances and inferred peculiar velocities of galaxies have permitted the reconstruction of the structure of over and under densities within the volume extending to 0.05c. This study focuses on the under dense regions, particularly the Local Void that lies largely in the zone of obscuration and consequently has received limited attention. Major over dense structures that bound the Local Void are the Perseus-Pisces and Norma-Pavo-Indus filaments separated by 8,500 km s −1 . The void network of the universe is interconnected and void passages are found from the Local Void to the adjacent very large Hercules and Sculptor voids. Minor filaments course through voids. A particularly interesting example connects the Virgo and Perseus clusters, with several substantial galaxies found along the chain in the depths of the Local Void. The Local Void has a substantial dynamical effect, causing a deviant motion of the Local Group of 200 − 250 km s −1 . The combined perturbations due to repulsion from the Local Void and attraction toward the Virgo Cluster account for ∼ 50% of the motion of the Local Group in the rest frame given by the cosmic microwave background.

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Section: Morphologies Of Nearest Voidssupporting

confidence: 67%

Cosmicflows-3: Cosmography of the Local Void

Tully

Pomarede

Graziani

et al. 2019

ApJ

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“…UGC 5186 is also found in Void No. 12 (Pustilnik et al 2019). The galaxy has a distance estimate of 10.8 Mpc based on the velocity with a correction for local motion (Pustilnik & Tepliakova 2011) and an alternate distance of 8.3 Mpc based on the TF method (Tully et al 2013).…”

Section: The Environment Surrounding Leoncinomentioning

confidence: 99%

“…Major gravitational structures are labeled in the last panel and include the Local Void with an approximate centroid near SGX, SGY, SGZ coordinates (0,0,5), the Virgo Cluster(−5,16, 0), and the Leo Spur (5,5,−5). Leoncino lies in an under-dense region, catalogued as void number 12 inPustilnik et al (2019).…”

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confidence: 99%

The Leoncino Dwarf Galaxy: Exploring the Low-metallicity End of the Luminosity–Metallicity and Mass–Metallicity Relations*

McQuinn

Berg

Skillman

et al. 2020

ApJ

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Extremely metal-poor (XMP) galaxies are low-mass, star-forming galaxies with gas-phase oxygen abundances below 12+log(O/H) = 7.35 (∼ 1 20 Z ). Galaxy evolution scenarios suggest three pathways to form an XMP: (1) secular evolution at low galaxy masses, (2) slow evolution in voids, or (3) dilution of measured abundances from infall of pristine gas. The recently discovered XMP galaxy Leoncino, with an oxygen abundance below 3% Z , provides an opportunity to explore these different scenarios. Using Hubble Space Telescope imaging of the resolved stellar populations of Leoncino, we measure the distance to the galaxy to be D= 12.1 +1.7 −3.4 Mpc and find that Leoncino is located in an underdense environment. Leoncino has a compact morphology, hosts a population of young, massive stars, has a high gas-to-star mass ratio, and shows signs of interaction with a galaxy nearby on the sky, UGC 5186. Similar to nearly all XMP galaxies known in the nearby universe, Leoncino is offset from the Luminosity-Metallicity (LZ) relation. Yet, Leoncino is consistent with the stellar Mass-Metallicity (MZ) relation defined by Local Volume galaxies. Thus, our results suggest that the offset from the LZ relation is due to higher recent star formation, likely triggered by a minor interaction, while the low oxygen abundance is consistent with the expectation that low-mass galaxies will undergo secular evolution marked by inefficient star formation and metal-loss via galactic winds. This is in contrast to XMP galaxies that are outliers in both the LZ and MZ relations; in such cases, the low oxygen abundances are best explained by dilution due to the infall of pristine gas. We also discuss why quiescent XMP galaxies are underrepresented in current surveys.

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“…These latter studies are mainly based on observations of galaxy clustering via galaxy counts in redshift surveys. Other authors have also claimed the existence of smaller-scale local voids e.g Tully et al (2008Tully et al ( , 2016; Rizzi et al (2017); Pustilnik et al (2019).…”

Section: Introductionmentioning

confidence: 97%

Local Hole revisited: evidence for bulk motions and self-consistent outflow

Shanks

Hogarth

Metcalfe

et al. 2019

Monthly Notices of the Royal Astronomical Society

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We revisit our mapping of the 'Local Hole', a large underdensity in the local galaxy redshift distribution that extends out to redshift, z ≈ 0.05 and a potential source of outflows that may perturb the global expansion rate and thus help mitigate the present 'H 0 tension'. First, we compare local peculiar velocities measured via the galaxy average redshift-magnitude Hubble diagram, z(m), with a simple dynamical outflow model based on the average underdensity in the Local Hole. We find that this outflow model is in good agreement with our peculiar velocity measurements from z(m) and not significantly inconsistent with SNIa peculiar velocity measurements from at least the largest previous survey. This outflow could cause an ≈ 2 − 3% increase in the local value of Hubble's constant. Second, considering anisotropic motions, we find that the addition of the outflow model may improve the z(m) fit of a bulk flow where galaxies are otherwise at rest in the Local Group frame. We conclude that the Local Hole plus neighbouring overdensities such as the Shapley Supercluster may cause outflow and bulk motions out to ≈ 150h −1 Mpc that are cosmologically significant and that need to be taken into account in estimating Hubble's constant.

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Void galaxies in the nearby Universe – I. Sample description

Cited by 30 publications

References 99 publications

Cosmicflows-3: Cosmography of the Local Void

Cosmicflows-3: Cosmography of the Local Void

The Leoncino Dwarf Galaxy: Exploring the Low-metallicity End of the Luminosity–Metallicity and Mass–Metallicity Relations*

Local Hole revisited: evidence for bulk motions and self-consistent outflow

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