Kinematic modeling of disk galaxies III. The warped "Spindle" NGC 2685

Details Kinematic modeling of disk galaxies III. The warped "Spindle" NGC 2685 Kinematic modeling of disk galaxies III. The warped "Spindle" NGC 2685

2008-10-17

arxiv.org/abs/0810.3025v1

Astronomy and Astrophysics

Astrophysics

26 pages, 14 figures, 6 tables, accepted for publication in Astronomy & Astrophysics. For a high-resolution version see http

Scientific paper

10.1051/0004-6361:200809372

This is the third of a series of papers in which the structure and kinematics of disk galaxies is studied. Employing direct tilted-ring fits to the data cube as introduced in Paper I, we perform an analysis of the "Spindle" galaxy NGC 2685, previously regarded as two-ringed polar ring galaxy. Deep HI and optical (i'-band) observations are presented. The HI observations strongly suggest that the gaseous structure of NGC 2685 does not consist of two separate mutually inclined regions, but forms a coherent, extremely warped disk, the appearance of two rings being due to projection effects. By comparing the HI total-intensity maps with the optical image we demonstrate that at large radii a faint stellar disk is well aligned with the outer HI disk. The shape of the dust-lanes obscuring the NE part of the inner stellar body indicates that also at smaller radii NGC 2685 possesses a disk containing gas, dust, and stars in which the various constituents are aligned. At smaller radii, this disk is kinematically decoupled from the central stellar body. Hence, in the region of the bright, central stellar body, NGC 2685 appears to consist of two disks that share a common centre, but have different orientation: a bright stellar lenticular body apparently devoid of dust and gas, and a heavily warped low-surface brightness disk containing stars, gas and dust. The low-surface-brightness disk changes its orientation gradually and at large radii assumes the orientation of the central stellar S0 disk. Since, according to our analysis, the intrinsic orientation of the low-surface-brightness disk changes through 70 degrees, the gaseous disk is coherent, and is at no radius orientated perpendicularly with respect to the central stellar body, NGC 2685 is likely not a classical polar-ring galaxy.

Affiliated with

Also associated with

No associations

Rating

Kinematic modeling of disk galaxies III. The warped "Spindle" NGC 2685 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Kinematic modeling of disk galaxies III. The warped "Spindle" NGC 2685, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Kinematic modeling of disk galaxies III. The warped "Spindle" NGC 2685 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-351592