| Issue |
A&A
Volume 431, Number 3, March I 2005
|
|
|---|---|---|
| Page(s) | 813 - 823 | |
| Section | Extragalactic astronomy | |
| DOI | https://doi.org/10.1051/0004-6361:20041884 | |
| Published online | 16 February 2005 | |
The peculiar galaxy Mkn 298 revisited with integral field spectroscopy *
1
INAF, Osservatorio Astronomico di Capodimonte, via Moiariello 16, 80131, Napoli, Italy e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
2
Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 2, 35122 Padova, Italy e-mail: [ciroi;piraf]@pd.astro.it
3
School of Physics and Astronomy, Tel-Aviv University, Ramat-Aviv, Tel-Aviv, 69978 Israel e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
4
Special Astrophysical Observatory, Nizhnij Arkhyz, 369167 Russia e-mail: [vafan;dodo]@sao.ru
Received:
23
August
2004
Accepted:
4
October
2004
Abstract
Spectroscopic and imaging data of the peculiar galaxy Mkn 298
are presented. Narrow-band Hα and broad-band
R images are used to study the star formation rate in the galaxy
and its morphology, which is typical of a merging system.
Long-slit and integral field spectra are used to assess the
kinematics of gas and stars, and the
nature of the ionizing source at different distances from the nucleus.
In particular, the nucleus of Mkn 298 is characterized by peculiar line
ratios:
![Mathematical equation: $\ion{[N}{ii]}$](/articles/aa/abs/2005/09/aa1884/aa1884_tex_eq1.png)
/Hα is typical of 
-like
regions, while ![Mathematical equation: $\ion{[O}{i]}$](/articles/aa/abs/2005/09/aa1884/aa1884_tex_eq4.png)
/Hα could indicate the
presence of an active galactic nucleus.
We show that models where a shock component is added to photoionization
from a starburst allow us to reproduce the observed line ratios.
Mkn 298 is thus most likely a star-forming galaxy, rather than a galaxy
hosting an active nucleus.
Key words: galaxies: peculiar / galaxies: individual: Mkn 298 / shock waves
Based on data obtained at the 2.2 m and NTT telescopes of ESO-la Silla (Chile), at the 2.2 m telescope of DSAZ-Calar Alto (Spain), and at the 6m telescope of SAO (Russia).
© ESO, 2005
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.