Bibcode
Galera-Rosillo, R.; Corradi, R. L. M.; Mampaso, A.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 612, id.A35, 11 pp.
Fecha de publicación:
4
2018
Revista
Número de citas
5
Número de citas referidas
4
Descripción
Context. Planetary nebulae (PNe) are excellent tracers of stellar
populations with low surface brightness, and therefore provide a
powerful method to detect and explore the rich system of substructures
discovered around the main spiral galaxies of the local group. Aim. We
searched the outskirts of the local group spiral galaxy M 33 (the
Triangulum) for PNe to gain new insights into the extended stellar
substructure on the northern side of the disc and to study the existence
of a faint classical halo. Methods: The search is based on wide
field imaging covering a 4.5 square degree area out to a maximum
projected distance of about 40 kpc from the centre of the galaxy. The PN
candidates are detected by the combination of images obtained in
narrowband filters selecting the [OIII]λ5007 Å and Hα
+ [NII] nebular lines and in the continuum g' and r' broadband filters.
Results: Inside the bright optical disc of M 33, eight new PN
candidates were identified, three of which were spectroscopically
confirmed. No PN candidates were found outside the limits of the disc.
Fourteen additional sources showing [OIII] excess were also discovered.
Conclusions: The absence of bright PN candidates in the area
outside the galaxy disc covered by this survey sets an upper limit to
the luminosity of the underlying population of 1.6 ×
107 L⊙, suggesting the lack of a massive
classical halo, which is in agreement with the results obtained using
the red giant branch population.
Based on observations made with the Isaac Newton Telescope and service
observations made with the William Herschel Telescope operated on the
island of La Palma by the Isaac Newton Group of Telescopes in the
Spanish Observatorio del Roque de los Muchachos of the Instituto de
Astrofísica de Canarias.
Proyectos relacionados
Nebulosas Bipolares
Nuestro proyecto persigue tres objetivos principales: 1) Determinar las condiciones físico-químicas de las nebulosas planetarias con geometría bipolar y de las nebulosas alrededor de estrellas simbióticas. El fin es entender el origen de la bipolaridad y poner a prueba los modelos teóricos que intentan explicar la morfología y la cinemática nebular
Antonio
Mampaso Recio