Discovery of a new polar ring galaxy

Discovery of a new polar ring galaxy

The gri composite picture of J0953 taken from hscMap. Credit score: Nishimura et al, 2022.

Japanese astronomers report the detection of a brand new Polar Ring Galaxy utilizing information obtained with the Subaru Telescope as a part of the strategic Hyper Suprime-Cam Subaru (HSC-SSP) program. The invention was detailed in an August 26 publish on the arXiv preprint server.

Polar ring galaxies (PRGs) are programs composed of an S0-type galaxy and a polar ring, which stay separated for billions of years. Usually, these outer polar rings, composed of gasoline and stars, are roughly aligned in a perpendicular orientation to the lengthy axis of the central host galaxy.

Nevertheless, though greater than 400 PRG candidates have been found thus far, solely dozens of them have been confirmed as true polar ring galaxies by follow-up spectroscopic observations.

Subsequently, as a way to increase the at the moment restricted checklist of confirmed PRGs, a staff of astronomers led by Minoru Nishimura from the Open College of Japan carried out an in depth examine of a pattern of recognized PRGs utilizing information from HSC- SSP. Consequently, they discovered a brand new PRG candidate, recognized as SDSS J095351.58+012036.1.

“Throughout this search, we found a brand new candidate PRG SDSS J095351.58+012036.1 (hereafter J0953). This galaxy is situated on the fringe of the Cosmic Evolution Survey area (COSMOS; Scoville et al. (2007)). “, wrote the researchers within the paper.

J0953 was initially recognized as a galaxy in 2000 by the Sloan Digital Sky Survey (SDSS). It has a photometric redshift of about 0.2, nonetheless, since no spectroscopic observations of J0953 have been made thus far, no spectroscopic redshift of this supply is at the moment obtainable.

In accordance with the examine, J0953 has a stellar mass of about 38.5 billion photo voltaic lots and a star formation charge of about 2.66 photo voltaic lots per yr. The host galaxy’s stellar mass and polar construction have been discovered to be 26.18 and 4.23 billion photo voltaic lots, respectively. The radius of the host galaxy was measured at 0.89 arcseconds, whereas that of the polar construction was 2.12 arcseconds.

Astronomers famous that J0953’s polar ring construction seems to be virtually perpendicular to its host galaxy’s disk with none disturbed options. They report that the polar construction is blue and possibly youthful than the host galaxy.

Moreover, the Sersic Index of the host galaxy was discovered to be 2.94, suggesting that the host galaxy has an elliptical galaxy-like construction somewhat than an exponential disk. The researchers added that additionally it is potential that the host galaxy is a disk galaxy.

Summarizing the outcomes, the examine authors identified that additional spectroscopic observations of J0953 needs to be carried out as a way to lastly affirm its PRG nature. Particularly, additional examine of the kinematic properties of the host galaxy and the polar construction is required.

Hubble imagines a fancy galactic trio

Extra info:
Minoru Nishimura, Kazuya Matsubayashi, Takashi Murayama, Yoshiaki Taniguchi, A New Polar Ring Galaxy Found within the COSMOS Discipline. arXiv:2208.12388v1 [astro-ph.GA]

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