Stars and ionized gas in S0 galaxy NGC 7743: an inclined large-scale gaseous disk

Details Stars and ionized gas in S0 galaxy NGC 7743: an inclined large-scale gaseous disk Stars and ionized gas in S0 galaxy NGC 7743: an inclined large-scale gaseous disk

2011-06-27

arxiv.org/abs/1106.5323v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

11 pages, 7 figures, accepted by Astrophysical Journal

Scientific paper

We used deep long-slit spectra and integral-field spectral data to study the stars and ionized gas kinematics and stellar population properties in the lenticular barred galaxy NGC 7743. We have shown that ionized gas at the distances larger than 1.5 kpc from the nucleus settles in the disk which is significantly inclined to the stellar disk of the galaxy. Making different assumptions about the geometry of the disks and involving different sets of emission lines into the fitting, under the assumption of thin flat disk circular rotation, we obtain the full possible range of angle between the disks to be 34+/-9 or 77+/-9 deg. The most probable origin of the inclined disk is the external gas accretion from a satellite, orbiting the host galaxy with a corresponding angular momentum direction. The published data on the HI distribution around NGC 7743 suggest that the galaxy has a gas-rich environment. The emission-line ratio diagrams imply the domination of shock waves in the ionization state of the gaseous disk, whereas the contribution of photoionization by recent star formation seems to be negligible. In some parts of the disk a difference between the velocities of the gas emitting in the forbidden lines and in the Balmer lines is detected. It may be caused by the fact that the inclined disk is mainly shock-excited, whereas some fraction of the Balmer-line emission is produced by a small amount of gas excited by young stars in the main stellar disk of NGC 7743. In the circumnuclear region (R< 200 pc) some evidences of the AGN jet interaction with an ambient interstellar medium were found.

Affiliated with

Also associated with

No associations

Rating

Stars and ionized gas in S0 galaxy NGC 7743: an inclined large-scale gaseous disk 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 Stars and ionized gas in S0 galaxy NGC 7743: an inclined large-scale gaseous disk, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stars and ionized gas in S0 galaxy NGC 7743: an inclined large-scale gaseous disk will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-638185