scholarly journals Eight per cent leakage of Lyman continuum photons from a compact, star-forming dwarf galaxy

Nature ◽  
2016 ◽  
Vol 529 (7585) ◽  
pp. 178-180 ◽  
Author(s):  
Y. I. Izotov ◽  
I. Orlitová ◽  
D. Schaerer ◽  
T. X. Thuan ◽  
A. Verhamme ◽  
...  
Keyword(s):  
Dwarf Galaxy ◽  
Compact Star ◽  
Star Forming ◽  
Lyman Continuum

scholarly journals Detection of high Lyman continuum leakage from four low-redshift compact star-forming galaxies

2016 ◽  
Vol 461 (4) ◽  
pp. 3683-3701 ◽  
Author(s):  
Y. I. Izotov ◽  
D. Schaerer ◽  
T. X. Thuan ◽  
G. Worseck ◽  
N. G. Guseva ◽  
...  
Keyword(s):  
Compact Star ◽  
Star Forming ◽  
Lyman Continuum

scholarly journals J1154+2443: a low-redshift compact star-forming galaxy with a 46 per cent leakage of Lyman continuum photons

2017 ◽  
Vol 474 (4) ◽  
pp. 4514-4527 ◽  
Author(s):  
Y I Izotov ◽  
D Schaerer ◽  
G Worseck ◽  
N G Guseva ◽  
T X Thuan ◽  
...  
Keyword(s):  
Compact Star ◽  
Star Forming ◽  
Lyman Continuum

Bidimensional Spectroscopic Mapping and Chemical Abundances of the Star‐forming Dwarf Galaxy I Zw 18

1998 ◽  
Vol 508 (1) ◽  
pp. 248-261 ◽  
Author(s):  
José M. Vílchez ◽  
Jorge Iglesias‐Páramo
Keyword(s):  
Dwarf Galaxy ◽  
Chemical Abundances ◽  
Star Forming

scholarly journals A pair of UV nuclei or a compact star-forming region near the active nucleus in Mrk 766?

2021 ◽  
Vol 42 (2) ◽  
Author(s):  
P. P. Deka ◽  
G. C. Dewangan ◽  
K. P. Singh ◽  
J. Postma
Keyword(s):  
Compact Star ◽  
Active Nucleus ◽  
Star Forming

scholarly journals New methods for identifying Lyman continuum leakers and reionization-epoch analogues

2020 ◽  
Vol 498 (1) ◽  
pp. 164-180 ◽  
Author(s):  
Harley Katz ◽  
Dominika Ďurovčíková ◽  
Taysun Kimm ◽  
Joki Rosdahl ◽  
Jeremy Blaizot ◽  
...  
Keyword(s):  
Emission Line ◽  
Galaxy Formation ◽  
Dwarf Galaxy ◽  
High Redshift ◽  
Indirect Methods ◽  
High Redshift Galaxies ◽  
Lyman Continuum ◽  
The Universe ◽  
Ionization Parameter ◽  
Redshift Galaxies

ABSTRACT Identifying low-redshift galaxies that emit Lyman continuum radiation (LyC leakers) is one of the primary, indirect methods of studying galaxy formation in the epoch of reionization. However, not only has it proved challenging to identify such systems, it also remains uncertain whether the low-redshift LyC leakers are truly ‘analogues’ of the sources that reionized the Universe. Here, we use high-resolution cosmological radiation hydrodynamics simulations to examine whether simulated galaxies in the epoch of reionization share similar emission line properties to observed LyC leakers at z ∼ 3 and z ∼ 0. We find that the simulated galaxies with high LyC escape fractions (fesc) often exhibit high O32 and populate the same regions of the R23–O32 plane as z ∼ 3 LyC leakers. However, we show that viewing angle, metallicity, and ionization parameter can all impact where a galaxy resides on the O32–fesc plane. Based on emission line diagnostics and how they correlate with fesc, lower metallicity LyC leakers at z ∼ 3 appear to be good analogues of reionization-era galaxies. In contrast, local [S ii]-deficient galaxies do not overlap with the simulated high-redshift LyC leakers on the S ii Baldwin–Phillips–Terlevich (BPT) diagram; however, this diagnostic may still be useful for identifying leakers. We use our simulated galaxies to develop multiple new diagnostics to identify LyC leakers using infrared and nebular emission lines. We show that our model using only [C ii]158 μm and [O iii]88 μm can identify potential leakers from non-leakers from the local Dwarf Galaxy Survey. Finally, we apply this diagnostic to known high-redshift galaxies and find that MACS 1149_JD1 at z = 9.1 is the most likely galaxy to be actively contributing to the reionization of the Universe.

scholarly journals Compact star-forming galaxies preferentially quenched to become PSBs inz< 1 clusters

2018 ◽  
Vol 482 (2) ◽  
pp. 1640-1650 ◽  
Author(s):  
Miguel Socolovsky ◽  
David T Maltby ◽  
Nina A Hatch ◽  
Omar Almaini ◽  
Vivienne Wild ◽  
...  
Keyword(s):  
Compact Star ◽  
Star Forming

scholarly journals SUB-KILOPARSEC ALMA IMAGING OF COMPACT STAR-FORMING GALAXIES AT z ∼ 2.5: REVEALING THE FORMATION OF DENSE GALACTIC CORES IN THE PROGENITORS OF COMPACT QUIESCENT GALAXIES

2016 ◽  
Vol 827 (2) ◽  
pp. L32 ◽  
Author(s):  
G. Barro ◽  
M. Kriek ◽  
P. G. Pérez-González ◽  
J. R. Trump ◽  
D. C. Koo ◽  
...  
Keyword(s):  
Compact Star ◽  
Star Forming

scholarly journals The Herschel Dwarf Galaxy Survey

2019 ◽  
Vol 626 ◽  
pp. A23 ◽  
Author(s):  
D. Cormier ◽  
N. P. Abel ◽  
S. Hony ◽  
V. Lebouteiller ◽  
S. C. Madden ◽  
...  
Keyword(s):  
Star Formation ◽  
Dwarf Galaxy ◽  
Spectral Synthesis ◽  
Line Emission ◽  
Ionized Gas ◽  
Star Forming ◽  
Gas Phases ◽  
Physical Conditions ◽  
Radiation Fields ◽  
Low Metallicity

The sensitive infrared telescopes, Spitzer and Herschel, have been used to target low-metallicity star-forming galaxies, allowing us to investigate the properties of their interstellar medium (ISM) in unprecedented detail. Interpretation of the observations in physical terms relies on careful modeling of those properties. We have employed a multiphase approach to model the ISM phases (H II region and photodissociation region) with the spectral synthesis code Cloudy. Our goal is to characterize the physical conditions (gas densities, radiation fields, etc.) in the ISM of the galaxies from the Herschel Dwarf Galaxy Survey. We are particularly interested in correlations between those physical conditions and metallicity or star-formation activity. Other key issues we have addressed are the contribution of different ISM phases to the total line emission, especially of the [C II]157 μm line, and the characterization of the porosity of the ISM. We find that the lower-metallicity galaxies of our sample tend to have higher ionization parameters and galaxies with higher specific star-formation rates have higher gas densities. The [C II] emission arises mainly from PDRs and the contribution from the ionized gas phases is small, typically less than 30% of the observed emission. We also find a correlation – though with scatter – between metallicity and both the PDR covering factor and the fraction of [C II] from the ionized gas. Overall, the low metal abundances appear to be driving most of the changes in the ISM structure and conditions of these galaxies, and not the high specific star-formation rates. These results demonstrate in a quantitative way the increase of ISM porosity at low metallicity. Such porosity may be typical of galaxies in the young Universe.

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