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A triumph of galaxies in three new pictures from the VLT Survey Telescope

May 7, 2024
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A triumph of galaxies in three new pictures from the VLT Survey Telescope
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A triumph of galaxies in three new images from the VST
ESO 510-G13, a curious lenticular galaxy about 150 million mild years from us, within the path of the Hydra constellation. Credit score: INAF/VST. M. Spavone (INAF), R. Calvi (INAF)

Distant galaxies, interacting galaxies, whose form has been cast by the mutual gravitational affect, but in addition galaxies forming teams and clusters, saved collectively by gravity—they’re the protagonists of three new pictures launched by the VLT Survey Telescope (VST).

VST is an optical telescope with a 2.6 m diameter mirror, fully inbuilt Italy, that has been working since 2011 on the European Southern Observatory’s (ESO) Paranal Observatory in Chile. Since 2022, the telescope has been totally managed by INAF by way of the Nationwide Coordination Heart for VST, based mostly on the INAF premises in Naples.

VST is specialised in observing massive areas of the sky because of its huge discipline digital camera, OmegaCAM, an precise “cosmic wide-angle lens” capable of seize, in every shot, one sq. diploma of the sky, a portion of the celestial vault twice as massive as the complete moon’s obvious diameter on both sides.

Apart from pictures for astrophysics analysis, spanning from stars to galaxies all the best way to cosmology, up to now 12 months the telescope has carried out a brand new program devoted to most people, observing nebulae, galaxies and different iconic objects throughout some full moon nights, when the brightness of our pure satellite tv for pc disturbs the gathering of scientific information. Extra pictures shall be printed within the coming months.

“Apart from scientific analysis, one of many objectives of the VST Heart is to disseminate scientific data and to share the wonders of the universe with most people. We particularly want that younger folks can uncover and nurture their curiosity in astrophysics by way of these wonderful pictures,” notes Enrichetta Iodice, INAF researcher in Naples and chargeable for the nationwide Coordination Heart for VST.

One of many three new pictures portrays ESO 510-G13, a curious lenticular galaxy about 150 million mild years from us, within the path of the Hydra constellation. The central bulge of the galaxy stands out. The darkish silhouette of the mud disk, seen from the sting, crosses the bulge, obscuring a part of the sunshine.

The disk’s distorted form, vaguely resembling an upside-down S, signifies the turbulent previous of ESO 510-G13, which can have acquired its present look following a collision with one other galaxy. Within the decrease proper nook, among the many many stars of the Milky Method scattered throughout the picture, a pair of spiral galaxies about 250 million mild years from us are additionally seen.

Zooming into the picture, many extra galaxies seem, even at larger distances, as small spots of sunshine elongated among the many many dots within the background.

A triumph of galaxies in three new images from the VST
A small group of 4 galaxies, referred to as Hickson Compact Group 90 (HGC 90), which is about 100 million mild years away from Earth, in direction of the Piscis Austrinus constellation. Credit score: INAF/VST/VEGAS, E. Iodice (INAF). M. Spavone (INAF), R. Calvi (INAF)

The second picture exhibits a small group of 4 galaxies, referred to as Hickson Compact Group 90 (HGC 90), which is about 100 million mild years away from Earth, in direction of the Piscis Austrinus constellation. The 2 spherical, vibrant spots close to the picture middle are the elliptical galaxies NGC 7173 and NGC 7176. The intense streak that bifurcates and connects these two galaxies is the third member of the group, the spiral galaxy NGC 7174: its curious form signifies the continued interplay between the three celestial our bodies, which has stripped their stars and fuel, mixing up their distribution. A halo of diffuse mild envelops the three galaxies.

The fourth galaxy belonging to the group, NGC 7172, seen within the higher a part of the picture, doesn’t appear to take part on this celestial dance: its core, crossed by darkish clouds of mud, hides a supermassive black gap that has been actively devouring the encompassing materials. The HGC 90 quartet of galaxies is embedded in a a lot bigger construction, together with dozens of galaxies, a few of that are seen on this picture.

A triumph of galaxies in three new images from the VST
The Abell 1689 galaxy cluster, which will be noticed within the path of the Virgo constellation. Credit score: INAF/VST, M. Spavone (INAF), R. Calvi (INAF)

The third picture exhibits a a lot richer and much more distant grouping of galaxies: the Abell 1689 galaxy cluster, which will be noticed within the path of the Virgo constellation.

Abell 1689 accommodates greater than 200 galaxies, largely seen as yellow-orange blobs, whose mild has traveled for about two billion years earlier than reaching the VST. The large mass, together with monumental portions of sizzling fuel and of the mysterious darkish matter along with the galaxies, deforms space-time within the neighborhood of the cluster.

Subsequently, the cluster acts as a “gravitational lens” on extra distant galaxies, amplifying their mild and producing distorted pictures, very similar to what a magnifying glass does. A few of these galaxies will be noticed as dots and tiny, barely curved strains, particularly across the cluster’s central areas.

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Istituto Nazionale di Astrofisica

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