Deep VLT spectroscopy of the blue compact dwarf galaxies Tol 1214-277 and Tol 65

Abstract

We present VLT spectroscopic observations with different spectral resolutions and different slit orientations of the two metal-deficient blue compact dwarf (BCD) galaxies Tol 1214-277 and Tol 65. The oxygen abundances in the brightest HII regions of Tol 1214-277 and Tol 65 are found to be 12+log O/H = 7.55+/-0.01 and 7.54+/-0.01, or Zsun/24. The nitrogen-to-oxygen abundance ratios in the two galaxies are log N/O =-1.64+/-0.03 and -1.60+/-0.02 and lie in the narrow range found for other most metal-deficient BCDs. The helium mass fraction derived in several HII regions in both galaxies is consistent with a high primordial helium mass fraction, Yp ~ 0.244. We confirm the detection of the high-ionization forbidden emission line [FeV]4227 in the spectrum of Tol 1214-277. Additionally, weak [NeIV]4725, [FeVI]5146, 5177, and [FeVII]5721, 6087 emission lines are detected in the high-resolution spectrum of Tol 1214-277. The detection of these lines implies the presence of hard radiation with photon energy in the range ~ 4-8 Ryd. Emission lines are detected in the spectra of eight galaxies in the fields of Tol 1214-277 and Tol 65. Seven of these galaxies are background objects, while one galaxy has a redshift close to that of Tol 1214-277. Situated at a projected distance of ~ 14.5 kpc from Tol 1214-277, this galaxy is probably a companion of the BCD.

arXiv comment16 pages, 8 Postscript figures

References in corpus (17)

• On the properties of massive Population III stars and metal-free stellar populations
• The transition from Population III to normal galaxies: Ly-a and HeII 1640 emission and the ionising properties of high redshift starburst galaxies
• Heavy element abundances in blue compact galaxies
• Systematic effects and a new determination of the primordial abundance of 4He and dY/dZ from observations of blue compact galaxies
• Helium abundance in the most metal-deficient blue compact galaxies: I Zw 18 and SBS 0335-052
• SBS 0335-052, a probable nearby young dwarf galaxy: evidence pro and con
• The origin of primary nitrogen in galaxies
• VLA HI Line Observations of the Extremely Metal-Poor Blue Compact Dwarf Galaxy SBS 0335-052
• Spectroscopic and photometric studies of low-metallicity star-forming dwarf galaxies. III. SBS 1415+437
• An imaging and spectroscopic study of the very metal-deficient blue compact dwarf galaxy Tol 1214--277
• On faint companions in the close environment of star-forming dwarf galaxies. Possible external star formation triggers ?
• Chandra Observations of the Three Most Metal-Deficient Blue Compact Dwarf Galaxies known in the Local Universe, SBS 0335-052, SBS 0335-052W, and I Zw 18
• Deep spectroscopy of the low-metallicity blue compact dwarf galaxy SBS 0335-052
• The He abundance in the metal-deficient blue compact dwarf galaxies Tol 1214-277 and Tol 65
• Starburst in HS 0822+3542 induced by the very blue LSB dwarf SAO 0822+3545
• SBS 0335-052W - an Extremely Low Metallicity Dwarf Galaxy
• Discovery of the high--ionization emission line [Ne V] 3426 in the blue compact dwarf galaxy Tol 1214-277

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