Japanese astronomers reveal the discovery of a new polar ring galaxy using data collected with the Subaru Telescope (HSC-SSP), as part of the Hyper Prime-Cam Subaru Strategic Program. The discovery was announced in a post on the arXiv preprint server on Aug.
Polar rings and S0-like galaxies form so-called polar ring galaxies (PRGs), which have existed apart from each other for billions of years. These outer polar rings of gas and stars are typically roughly perpendicular to the major axis of the central main galaxy.
Although more than 400 PRG candidates have been found so far, only a small number of them have been confirmed as true polar ring galaxies by further spectroscopic research.
Therefore, a group of astronomers led by Minoru Nishimura of the Open University of Japan conducted a comprehensive analysis of a known PRG sample using HSC-SSP data to augment the current small list of validated PRGs. As a result, they discovered a new candidate for PRG, named SDSS J095351.58+012036.1.
“Through this search (hereafter J0953), we found a new PRG candidate SDSS J095351.58+012036.1. Cosmic Evolution Research (COSMOS; Scoville et al., 2007) borders this galaxy”.
J0953 was first recognized as a galaxy by the Sloan Digital Sky Survey (SDSS) in 2000. Although J0953 has a photometric redshift of about 0,2, no spectroscopic observations of this source have yet been made, so no information on its spectroscopic redshift is currently available.
J0953 has a stellar mass of about 38,5 billion solar masses and forms stars each year at a rate of about 2.66 solar masses, according to the study. The stellar mass and polar structure of the host galaxy were discovered to be 4.23 billion and 26.18 billion solar masses, respectively. The radius of the host galaxy was 0.89 arcseconds, while the radius of the polar structure was 2.12 arcseconds.
In summarizing the findings, the study's authors emphasized the need for additional spectroscopic observations to definitively determine the PRG status of J0953. More research is needed, especially on the kinematics and polar structure of the host galaxy.