Study investigates kinematics and origin of gas in the galaxy NGC 2655

Utilizing the 6-meter telescope of the Particular Astrophysical Observatory (SAO) and the two.5-meter telescope of the Caucasian Mountain Observatory (CMO), Russian astronomers have noticed a large galaxy generally known as NGC 2655. Outcomes of the observational marketing campaign, introduced January 12 on the arXiv preprint server, shed extra mild on the kinematics and origin of ionized fuel on this galaxy.

At a distance of about 79.5 million light years, NGC 2655 is a big disk galaxy within the constellation Camelopardalis. The diameter of the disk of NGC 2655 is roughly 195,000 mild years, whereas the mass of the galaxy’s stellar inhabitants is estimated to be 200 billion solar plenty.

NGC 2655 is the brightest member of the NGC 2655 group, which incorporates seven galaxies brighter than −15 magazine, and all of them are of the late sort. This implies that the entire fuel content material of NGC 2655 may end result from accumulating the encircling dwarfs by the central galaxy.

The fuel content material of NGC 2655 drew the eye of a workforce of astronomers led by Olga Silchenko of the Lomonosov Moscow State College in Russia. They inspected this galaxy utilizing SAO and CMO.

“NGC 2655 is a testbed case of extremely inclined rotation of fuel within the absence of any star formation in a gas-rich S0, which is of specific curiosity for us…. We’ve got undertaken some extra observations and at the moment are able to look into the small print of how and when the fuel has come to NGC 2655,” the researchers wrote within the paper.

The observations discovered that NGC 2655 has two exponential disks. These disks have totally different scale lengths and likewise totally different orientations of the isophote main axis. On the whole, the outcomes counsel that the inner and exterior rotation axes of the stellar disk of NGC 2655 are inclined to one another. Subsequently, the astronomers concluded that NGC 2655 is a multi-spin galaxy.

Moreover, the research discovered that the orientations of the large disk of impartial hydrogen and the outer stellar disk in NGC 2655 coincide with one another each spatially and kinematically. The astronomers added that the outer gaseous disk lies inside the outer stellar disk, and that even present star formation is happening someplace in it.

In response to the paper, the obtained information verify {that a} minor merger happened in NGC 2655, which was advised by earlier research. The researchers suppose {that a} small satellite galaxy struck the central a part of NGC 2655 virtually vertically about 10 million years in the past.

“Apparently, a companion fell onto the galaxy virtually vertically, and now, inside two kiloparsecs from the middle, we observe the remnants of the destroyed companion as a circumpolar loop—the image is similar to Sagittarius dwarf torn aside by the Milky Way,” the authors of the paper defined.

Nonetheless, they famous that within the case of NGC 2655, there was way more fuel within the merged companion. Attempting to elucidate the origin of ionized fuel in NGC 2655, the scientists subsequently concluded that the fuel of the vertically infalling companion hit the galaxy’s gaseous disk experiencing common rotation. This collision created a shock wave that excited the fuel within the polar loop and ran outward throughout the big galactic gaseous disk.

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