scholarly journals Catalogues of isolated galaxies, isolated pairs, and isolated triplets in the local Universe

2015 ◽  
Vol 578 ◽  
pp. A110 ◽  
Author(s):  
M. Argudo-Fernández ◽  
S. Verley ◽  
G. Bergond ◽  
S. Duarte Puertas ◽  
E. Ramos Carmona ◽  
...  
Keyword(s):  
Local Universe ◽  
Isolated Galaxies

scholarly journals Evolution of dwarf galaxy observable parameters

2020 ◽  
Vol 493 (1) ◽  
pp. 638-650
Author(s):  
Eimantas Ledinauskas ◽  
Kastytis Zubovas
Keyword(s):  
Galaxy Evolution ◽  
Dwarf Galaxies ◽  
Background Radiation ◽  
Dwarf Galaxy ◽  
High Redshift ◽  
Stellar Mass ◽  
Local Universe ◽  
Isolated Galaxies ◽  
Mass Assembly ◽  
Hubble Time

ABSTRACT We present a semi-analytic model of isolated dwarf galaxy evolution and use it to study the build-up of observed correlations between dwarf galaxy properties. We analyse the evolution using models with averaged and individual halo mass assembly histories in order to determine the importance of stochasticity on the present-day properties of dwarf galaxies. The model has a few free parameters, but when these are calibrated using the halo mass–stellar mass and stellar mass–metallicity relations, the results agree with other observed dwarf galaxy properties remarkably well. Redshift evolution shows that even isolated galaxies change significantly over the Hubble time and that ‘fossil dwarf galaxies’ with properties equivalent to those of high-redshift analogues should be extremely rare, or non-existent, in the local Universe. A break in most galaxy property correlations develops over time, at a stellar mass $M_* \simeq 10^7 \, {\rm M_{\odot }}$. It is caused predominantly by the ionizing background radiation and can therefore in principle be used to constrain the properties of reionization.

scholarly journals Faint features in the isolated galaxy CIG96

2016 ◽  
Vol 11 (S321) ◽  
pp. 292-292
Author(s):  
P. Ramírez-Moreta ◽  
L. Verdes-Montenegro ◽  
S. Leon ◽  
J. Blasco-Herrera ◽  
M. Fernández-Lorenzo ◽  
...  
Keyword(s):  
Galaxy Formation ◽  
Optical Observations ◽  
Local Universe ◽  
Isolated Galaxies ◽  
Galaxy Formation And Evolution ◽  
Formation And Evolution ◽  
Minor Mergers ◽  
Gas Accretion ◽  
Shed Light

The AMIGA project carries out a multiwavelength study of the largest catalogue of isolated galaxies from the Local Universe (CIG, Karachentseva 1973). Compared to any other sample —field galaxies included— and using highly strict isolation criteria (unperturbed for at least ~3 Gyr, Verdes-Montenegro et al. 2005), all the results show that these galaxies have the lowest values of the physical magnitudes expected to be enhanced by interactions. This strongly supports isolated galaxies as ideal laboratories for the study of galaxy formation and evolution. Despite CIG galaxies show the lowest HI integrated profile asymmetry level when compared to any other sample, some cases present up to 50% HI asymmetry (Espada et al. 2011b). We aim to shed light over the causes and sources of such asymmetries with our deep radiointerferometric and optical observations of CIG targets. Since major mergers are ruled out by the isolation criteria, in this work we are addressing whether minor mergers, internal processes or primordial gas accretion are responsible for such asymmetries.

scholarly journals Violent buckling benefits galactic bars

2019 ◽  
Vol 492 (2) ◽  
pp. 2241-2249 ◽  
Author(s):  
Angela Collier
Keyword(s):  
Dark Matter ◽  
Landau Damping ◽  
Local Universe ◽  
Buckling Instability ◽  
Euler Buckling ◽  
Isolated Galaxies ◽  
Non Linear ◽  
Analytical Result ◽  
Bar Formation ◽  
Kinematic Properties

ABSTRACT Galactic bars are unstable to a vertical buckling instability which heats the disc and in some cases forms a boxy/peanut shaped bulge. We analyse the buckling instability as an application of classical Euler buckling followed by non-linear gravitational Landau damping in the collisionless system. We find that the buckling instability is dictated by the kinematic properties and geometry of the bar. The analytical result is compared to simulations of isolated galaxies containing the disc and dark matter components. Our results demonstrate that violent buckling does not destroy bars while a less energetic buckling can dissolve the bar. The discs that undergo gentle buckling remain stable to bar formation which may explain the observed bar fraction in the local Universe. Our results align with the results from recent surveys.

A GALAXY BASELINE: Multiwavelength Study of a Sample of the Most Isolated Galaxies in the Local Universe

2010 ◽  
pp. 379-384
Author(s):  
Lourdes Verdes-Montenegro ◽  
J. Sulentic ◽  
G. Bergond ◽  
Daniel Espada ◽  
S. Leon ◽  
...  
Keyword(s):  
Local Universe ◽  
Isolated Galaxies

scholarly journals The stellar mass–size relation for the most isolated galaxies in the local Universe★

2013 ◽  
Vol 434 (1) ◽  
pp. 325-335 ◽  
Author(s):  
M. Fernández Lorenzo ◽  
J. Sulentic ◽  
L. Verdes-Montenegro ◽  
M. Argudo-Fernández
Keyword(s):  
Stellar Mass ◽  
Local Universe ◽  
Isolated Galaxies ◽  
Mass Size ◽  
Size Relation

scholarly journals The MOSDEF survey: differences in SFR and metallicity for morphologically selected mergers at z ∼ 2

2020 ◽  
Vol 501 (1) ◽  
pp. 137-145
Author(s):  
Katelyn Horstman ◽  
Alice E Shapley ◽  
Ryan L Sanders ◽  
Bahram Mobasher ◽  
Naveen A Reddy ◽  
...  
Keyword(s):  
High Redshift ◽  
Statistical Significance ◽  
Formation Rate ◽  
Control Sample ◽  
Stellar Mass ◽  
Mass Star ◽  
Local Universe ◽  
Galaxy Interactions ◽  
Isolated Galaxies ◽  
Future Work

ABSTRACT We study the properties of 55 morphologically-identified merging galaxy systems at z ∼ 2. These systems are flagged as mergers based on features such as tidal tails, double nuclei, and asymmetry. Our sample is drawn from the MOSFIRE Deep Evolution Field (MOSDEF) survey, along with a control sample of isolated galaxies at the same redshift. We consider the relationships between stellar mass, star formation rate (SFR), and gas-phase metallicity for both merging and non-merging systems. In the local universe, merging systems are characterized by an elevated SFR and depressed metallicity compared to isolated systems at a given mass. Our results indicate SFR enhancement and metallicity deficit for merging systems relative to non-merging systems for a fixed stellar mass at z ∼ 2, though larger samples are required to establish these preliminary results with higher statistical significance. In future work, it will be important to establish if the enhanced SFR and depressed metallicity in high-redshift mergers deviate from the ‘fundamental metallicity relation,’ as is observed in mergers in the local universe, and therefore shed light on gas flows during galaxy interactions.

The AMIGA sample of isolated galaxies (Corrigendum)

2012 ◽  
Vol 538 ◽  
pp. C1 ◽  
Author(s):  
U. Lisenfeld ◽  
D. Espada ◽  
L. Verdes-Montenegro ◽  
N. Kuno ◽  
S. Leon ◽  
...  
Keyword(s):  
Isolated Galaxies

scholarly journals Large-Scale Flows in the Local Universe

1996 ◽  
Vol 168 ◽  
pp. 175-182 ◽  
Author(s):  
D.S. Mathewson ◽  
V.L. Ford
Keyword(s):  
Large Scale ◽  
Velocity Measurements ◽  
Local Universe ◽  
Peculiar Velocities ◽  
Redshift Surveys ◽  
Density Maps ◽  
The Universe ◽  
Great Wall ◽  
Great Attractor ◽  
Streaming Flow

Peculiar velocity measurements of 2500 southern spiral galaxies show large-scale flows in the direction of the Hydra-Centaurus clusters which fully participate in the flow themselves. The flow is not uniform over this region and seems to be associated with the denser regions which participate in the flow of amplitude about 400km/s. In the less dense regions the flow is small or non-existent. This makes the flow quite asymmetric and inconsistent with that expected from large-scale, parallel streaming flow that includes all galaxies out to 6000km/s as previously thought. The flow cannot be modelled by a Great Attractor at 4300km/s or the Centaurus clusters at 3500km/s. Indeed, from the density maps derived from the redshift surveys of “optical” and IRAS galaxies, it is difficult to see how the mass concentrations can be responsible particularly as they themselves participate in the flow. These results bring into question the generally accepted reason for the peculiar velocities of galaxies that they arise solely as a consequence of infall into the dense regions of the universe. To the N. of the Great Attractor region, the flow increases and shows no sign of diminishing out to the redshift limit of 8000km/s in this direction. We may have detected flow in the nearest section of the Great Wall.

scholarly journals DARK MATTER DECAY AND ANNIHILATION IN THE LOCAL UNIVERSE: CLUES FROM FERMI

2010 ◽  
Vol 726 (1) ◽  
pp. L6 ◽  
Author(s):  
A. J. Cuesta ◽  
T. E. Jeltema ◽  
F. Zandanel ◽  
S. Profumo ◽  
F. Prada ◽  
...  
Keyword(s):  
Dark Matter ◽  
Local Universe
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