SBS 0335-052, a probable nearby young dwarf galaxy: evidence pro and con

Details SBS 0335-052, a probable nearby young dwarf galaxy: evidence pro and con SBS 0335-052, a probable nearby young dwarf galaxy: evidence pro and con

1996-07-23

arxiv.org/abs/astro-ph/9607119v1

Astronomy and Astrophysics

Astrophysics

27 pages and 8 Postscript figures, uses aaspp4.sty. Submitted to Astrophysical Journal

Scientific paper

10.1086/303664

The results of Multiple Mirror Telescope spectrophotometry of the extremely low-metallicity blue compact galaxy (BCG) SBS 0335-052 are presented. The oxygen abundance in central brightest part of the galaxy is found to be 12 + log(O/H) = 7.33+-0.01. The N/O, Ne/O, S/O and Ar/O abundance ratios are close to those derived in other BCGs, suggesting that heavy element enrichment in the HII region is due to massive star evolution. We detect auroral [OIII] 4363 emission in the inner part of HII region with a diameter of 3.6 kpc and find that the HII region inside this diameter is hot, T_e~20000K. The oxygen abundance in this region is nearly constant (12 + log(O/H) = 7.1 - 7.3), implying effective mixing of ionized gas on short time-scales. We also discuss the origin of blue underlying extended low-intensity emission detected in SBS 0335-052. The (V-I) and (R-I) color distributions suggest that a significant contribution to the extended envelope is due to ionized gas emission. However, the observed equivalent width of Hbeta emission in the extended envelope is 2-3 times lower than the value expected in the case of pure gaseous emission. These findings suggest that, along with the blue young (~10^7yr) stellar clusters, an older stellar population with age ~10^8yr may be present in the extended envelope of SBS 0335-052, having a total mass conclude that SBS 0335-052 is a young nearby dwarf galaxy with age ~10^8 yr.

Affiliated with

Also associated with

No associations

Rating

SBS 0335-052, a probable nearby young dwarf galaxy: evidence pro and con 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 SBS 0335-052, a probable nearby young dwarf galaxy: evidence pro and con, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and SBS 0335-052, a probable nearby young dwarf galaxy: evidence pro and con will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-151107