Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2010-09-06
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
Accepted for publication in MNRAS. 16 pages, 10 figures, 4 tables
Scientific paper
This study presents a deep H{\alpha} kinematical analysis of the Sculptor Group galaxy NGC253. The Fabry-Perot data were taken with the 36-cm Marseille Telescope in La Silla, Chile, using an EMCCD detector. Typical emission measures of ~0.1 cm^-6 pc are reached. The observations allow the detection of the Diffuse Ionized Gas component through [N II] emission at very large radii of 11.5', 12.8' and 19.0', on the receding side of the galaxy. No H{\alpha} emission is observed at radii larger than the neutral component (11.5'). The very extended rotation curve confirms previous results and shows signs of a significant decline, on the order of 30 per cent vmax . Using the rotation data, mass models are constructed with and without the outer [N II] data points, and similar results are found. The declining part of the rotation curve is very well modeled, and seems to be truly declining.
Carignan Claude
Daigle Olivier
de Denus-Baillargeon Marie-Maude
Epinat Benoit
Hernandez Olga
No associations
LandOfFree
Deep Hα Observations of NGC 253: a Very Extended and Possibly Declining Rotation Curve? 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 Deep Hα Observations of NGC 253: a Very Extended and Possibly Declining Rotation Curve?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Deep Hα Observations of NGC 253: a Very Extended and Possibly Declining Rotation Curve? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-703905