Mastodawn

Nayra 5d ago

Meu barquinho vai subir o São Francisco...

#mar #vela #verão #praia #summer #beach #sea #ocean #photography

Daniel Pomarède Mar 11

Cosmography alert 🚨

Hidden Vela Supercluster Revealed by First Hybrid Redshift & Peculiar Velocity Reconstruction

by Amber M. Hollinger and co-authors

https://arxiv.org/abs/2603.09339

#Cosmography #Cosmology #Cosmicflows #Vela #supercluster #VelaSupercluster #Laniakea #LaniakeaSupercluster #Astronomy #Astrophysics #Astrodon #science #news

Hidden Vela Supercluster Revealed by First Hybrid Redshift & Peculiar Velocity Reconstruction

A large fraction of the extragalactic sky is obscured by foreground dust and stars along the plane of the Milky Way, leaving a major gap (~ 20%) in whole-sky maps of large-scale structures -- an incompleteness that is even more severe for peculiar velocity samples. This has long limited an unambiguous interpretation of observed cosmic flows and their connection to the underlying mass-density field. We present a new hybrid reconstruction methodology which combines 65,518 galaxy peculiar velocity distances from the CF4++ catalogue (Courtois2025) with 8283 new galaxy redshifts observed near the southern Galactic plane (|b| <= 10 degrees) Zone of Avoidance. A major advance is the inclusion of 2176 high-sensitivity, interferometric HI redshifts obtained with the SARAO MeerKAT telescope which for the first time provide coverage of the innermost 3degrees-wide strip of the southern ZOA and to unprecedented depth. This hybrid redshifts & peculiar velocities approach yields a substantially revised view of the inferred overdensities in and around the ZOA. In particular, the Vela supercluster emerges as a dominant mass concentration, rivaling the Shapley concentration and exceeding the mass associated with Laniakea and the Great Attractor region. With a total mass of 33.8 10^16 Msol, a characteristic radius of 70 hmpc, and a double core morphology at a distance of 189 hmpc, Vela dominates the mass budget and gravitational influence of the southern Zone of Avoidance. These results provide the most complete and dynamically consistent picture to date of the southern Zone of Avoidance and demonstrate the transformative potential of hybrid reconstruction techniques tailored for the next generation of large-scale surveys.

arXiv.org

Kuuke's Sterrenbeelden Mar 7

Regor – Gamma Velorum
Gamma Velorum, ook bekend als Regor, is een meervoudig stersysteem in de richting van het zuidelijke sterrenbeeld Vela – Zeilen.
#dubbelster #GammaVelorum #regor #ster #sterrenbeeld #vela #WolfRayetSter #zeilen
https://www.kuuke.nl/regor-gamma-velorum/

Regor – Gamma Velorum – Kuuke's Sterrenbeelden

Gamma Velorum, ook bekend als Regor, is een meervoudig stersysteem in de richting van het zuidelijke sterrenbeeld Vela – Zeilen. De ster heeft een schijnbare helderheid van magnitude 1,72 en het is daarmee de helderste ster in Zeilen. De ster is ongeveer 1095 lichtjaar van ons verwijderd. Het stersysteem bevat de helderste en meest nabije…

Kuuke's Sterrenbeelden Mar 4

Suhail – Lambda Velorum
Lambda Velorum is een oranje superreus in het sterrenbeeld Vela – Zeilen. Met een gemiddelde schijnbare helderheid van magnitude 2,21
#Gum19 #Gum29 #LambdaVelorum #ster #sterrenbeeld #suhail #vela #zeilen
https://www.kuuke.nl/suhail-lambda-velorum/

Kuuke's Sterrenbeelden Mar 1

Alsephina – Delta Velorum
Alsephina, Delta Velorum Aa, is de hoofdcomponent is een drievoudig stersysteem in een afstand van ongeveer 80,6 lichtjaar in de
#alsephina #ArgoNavis #carina #DeltaVelorum #puppis #ster #sterrenbeeld #ValseKruis #vela #zeilen #zuiderkruis
https://www.kuuke.nl/alsephina-delta-velorum/

DoomsdaysCW Feb 28

@Wyatt_H_Knott The #VelaIncident (which you referenced) was more than likely the 3rd such incident involving #Israel and #NuclearWeapons. Also, #SouthAfrica helped to keep #Vela a secret.