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References in periodicals archive ?
Caption: NGC 660 Situated some 43 million light-years away, this Seyfert is a fine example of a polar-ring galaxy. It's not yet known how these objects came to be: One scenario postulates the merging of two galaxies at a right angle, while another has the host galaxy tidally stripping a passing gas-rich spiral galaxy.
All the action appears in a single frame, with the stunning polar-ring galaxy NGC 660 as the focus of attention.
But NGC 660, which lies about 40 million light-years distant toward the direction of Pisces the Fishes, is the only polar-ring galaxy known with what is called a late-type lenticular galaxy as its host.
A polar-ring galaxy actually is a member of the S0 class of galaxies--a cross between a spiral and an elliptical, with mostly old stars and very little gas--surrounded by a circle of stars, gas and dust.
Photo: Negative image of polar-ring galaxy ESO 415-G26.
Photo: Polar-ring galaxy NGC 4650A has a central spindle of old stars and a nearly edge-on ring of gas, dust and young stars that extends above and below the disk.
A polar-ring galaxy exhibits a disk or ring of gas, dust, and stars that's nearly perpendicular to the disk of the host galaxy.
image of the polar-ring galaxy NGC 4650A in Centaurus (page 26).
This beautiful Hubble Space Telescope image of NGC 4650A, the prototypical polar-ring galaxy nearly 130 million light-years away in Centaurus, shows its detailed structure.
Size Notes NGC 4622 12.4 1.7' x 1.6' Spiral arms leading rotation NGC 4650 11.6 2.8' x 2.8' Part of the Centaurus Chain NGC 4650A 13.3 1.6' x 0.8' Polar-ring galaxy NGC 4696 10.4 4.5' x 3.2' Part of Abell 3526 NGC 4709 10.9 2.4' x 2.0' Part of Abell 3526 NGC 5215 12.9 1.1' x 0.5' Interacting pair NGC 5220 12.0 2.3' x 0.7' Bisecting dust lane IC 4296 10.6 2.8' x 2.8' Part of Abell 3565 IC 4329 11.3 3.4' x 1.9' Part of Abell 3574 IC 4329A 13.0 1.4' x 0.4' Seyfert galaxy NGC 5291 14.1 1.2' x 0.8' Seashell Galaxy nearby STEVE GOTTLIEB is a regular Deep-Sky Notebook contributor.