Accueil > Séminaires d’Astrophysique > X-ray sources and extinction towards the Galactic Centre

 

X-ray sources and extinction towards the Galactic Centre

Andrew Gosling (Université d’Oulu, Finlande)

Par Stephane Charpinet - 14/05/2008

 

Séminaires d’Astrophysique

de l’Observatoire Midi-Pyrénées


Séminaire de

Andrew GOSLING

 (Université d’Oulu, Finlande)

Jeudi 15 Mai 2008 à 11h

CESR


X-ray sources and extinction towards the Galactic Centre

The Nuclear Bulge, an area of only a few hundred parsecs immediately surrounding the Galactic Centre, is an extremely complex region of the Galaxy. Containing as much as 1% of all the stars in the Galaxy, up to 10% of the diffuse material, areas of star formation and the central super-massive black hole it is an extremely complex region of space to study. In my talk I will cover only two aspects of this region, a search for the counterparts to the point like X-ray sources of the Nuclear Bulge, and mapping of the diffuse material causing extinction in the near-infrared.

A survey of the Nuclear Bulge by the Chandra space telescope revealed over 2000 point like X-ray sources, the emission from which had previously been attributed to part of the Bulge’s diffuse X-ray emission. We have been searching for candidate counterparts to these sources, a task that is only starting to be achievable thanks to new near-infrared instruments. This task is made even more difficult due to the high level of extinction towards the Nuclear Bulge.

Our search for the counterparts to the X-ray sources revealed that the extinction towards the Nuclear Bulge (and possibly throughout the Galaxy) is far more complex than was previously imagined. Not only does the level of extinction in the Nuclear Bulge vary on scales as small as 5 arcsecond, but the relationship of the extinction to wavelength can be variable on equally small scales. I will present the method we have used to measure this variability and the results of our mapping of the distribution.

 

 

[Page Précédente] [Dans la même rubrique] [Sommaire]

 

 

Site du CNRS Logo OMP
Logo UPS
Logo INSU-CNRS

Annuaire

Rechercher

Sur ce site



Bibliotheque

Laboratoire Astrophysique de Toulouse - Tarbes (UMR5572)

CNRS (Midi-Pyrénées)

Univ. Paul Sabatier

Liens utiles

Accueil Imprimer Contact mail Plan du site Crédits