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Searching for metal-deficient emission-line galaxy candidates: the final sample of the SDSS DR12 galaxies
N. G. Guseva, Y. I. Izotov, K. J. Fricke +1
We present a spectroscopic study of metal-deficient dwarf galaxy candidates, selected from the SDSS DR12. The oxygen abundances were derived using the direct method in galaxies wit…
Do Some AGN Lack X-ray Emission?
Charlotte Simmonds, Franz E. Bauer, Trinh X. Thuan +3
Intermediate-Mass Black Holes (IMBHs) are thought to be the seeds of early Supermassive Black Holes (SMBHs). While 100 IMBH and small SMBH candidates have been…
Lyman-alpha spectral properties of five newly discovered Lyman continuum emitters
A. Verhamme, I. Orlitova, D. Schaerer +4
We have recently reported the discovery of five low redshift Lyman continuum (LyC) emitters (LCEs, hereafter) with absolute escape fractions fesc(LyC) ranging from 6 to 13%, higher…
The HI content of extremely metal-deficient blue compact dwarf galaxies
T. X. Thuan, K. M. Goehring, J. E. Hibbard +2
We have obtained new HI observations with the 100m Green Bank Telescope (GBT) for a sample of 29 extremely metal-deficient star-forming Blue Compact Dwarf (BCD) galaxies, selected…
The bursting nature of star formation in compact star-forming galaxies from the Sloan Digital Sky Survey
Y. I. Izotov, N. G. Guseva, K. J. Fricke +1
We study integrated characteristics of ~14000 low-redshift (0<z<1) compact star-forming galaxies (SFGs) selected from the Data Release 12 of the Sloan Digital Sky Survey. It is fou…
The ionizing photon production efficiency of compact z~0.3 Lyman continuum leakers and comparison with high redshift galaxies
D. Schaerer, Y. I. Izotov, A. Verhamme +4
We have recently discovered five Lyman continuum leaking galaxies at z~0.3, selected for their compactness, intense star-formation, and high [OIII]/[OII] ratio (Izotov et al. 2016a…
Detection of high Lyman continuum leakage from four low-redshift compact star-forming galaxies
Y. I. Izotov, D. Schaerer, T. X. Thuan +4
Following our first detection reported in Izotov et al. (2016), we present the detection of Lyman continuum (LyC) radiation of four other compact star-forming galaxies observed wit…
Lyman continuum leaking from the compact star-forming dwarf galaxy J0925+1403
Y. I. Izotov, I. Orlitova, D. Schaerer +4
One of the key questions in observational cosmology is the identification of the sources responsible for ionisation of the Universe after the cosmic Dark Ages, when the baryonic ma…