Polar-ring galaxies: New candidates and statistics

Details Polar-ring galaxies: New candidates and statistics Polar-ring galaxies: New candidates and statistics

Mar 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011astl...37..171r&link_type=abstract

Astronomy Letters, Volume 37, Issue 3, pp.171-180

Astronomy and Astrophysics

Astronomy

2

Galaxies, Interacting Galaxies, Morphology, Kinematics

Scientific paper

We present the results of our observational study of two candidates for polar-ring galaxies (PRGs). Both objects, A2330-3751 and SDSS J000911.57-003654.7, are giant edge-on galaxies with large-scale structures resembling polar rings observed along their minor axes. The optical diameter of the putative ring reaches 60 kpc in A2330-3751 and 18 kpc in SDSS J000911.57-003654.7. To estimate the space density of PRGs, we have constructed their luminosity function in the range of B-band absolute magnitudes from -17{·/ m }5 to -21{·/ m }5. We have found that ˜10-3 of the nearby galaxies exhibit polar structures. Polar rings around early-type (E/S0) galaxies are encountered approximately a factor of 3 more frequently than those around spiral ones. According to our estimates, ˜20-30 PRGs in which large-scale rings are seen almost face-on must be observed among relatively bright galaxies ( B ≤ 15 m ).

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