Low Surface Brightness Galaxies with the Sloan Digital Sky Survey

I will briefly review my research interest on Low Surface Brightness Galaxies (LSBGs). I will show the latest results from our survey for LSBGs with the Sloan Digital Sky Survey (SDSS) data. I used SDSS imaging data to establish a sample of all galaxies with radii >12 arcsec and a limiting surface brightness in g=26.5 mag/sq.arcsec within an area of 228 sq.deg using my own detection and analysis software. For all found galaxies (~5500) the total and surface photometry was produced in "ugriz" bands and bulge/disk fitting was done additionally. The redshifts were collected both from the SDSS and NED databases. The spectra of 145 galaxies (most of them are LSBGs) with unknown redshifts were obtained with the VLT, NTT, 6m (SAO RAS), 3.5m, 2.2m (Calar Alto) telescopes and velocities for 115 galaxies were added finally to the sample.

The other location where astronomers have studied LSBGs is, of course, the Local Group and its environments. I will present our results based on resolved stellar photometry from SDSS data for M31 galaxy:

(1) discovery of the faint, extended feature of luminous red giant stars in the outer halo of M31, which we have called Andromeda NE;

(2) discovery of Andromeda IX, a new dwarf spheroidal satellite of M31 that is the lowest luminosity, lowest surface brightness galaxy found to date;

(3) development of a method to identify planetary nebula (PN) candidates that results in spectroscopic discovering of ~90 new PNe in the outer parts of M31 with efficiency of 85%.

 

Fecha: 
30/05/2005 - 14:00
Conferenciante: 
Alexei Kniazev
Filiación: 
ESO/MPIA


Seminarios