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Dwarf highly star-forming galaxies (SFGs) dominated the early Universe and are considered the main driver of its reionization. However, direct observations of these distant galaxies are mainly confined to rest-frame ultraviolet and visible…

Astrophysics of Galaxies · Physics 2024-08-14 K. Kouroumpatzakis , J. Svoboda , A. Zezas , A. Borkar , E. Kyritsis , P. G. Boorman , C. Daoutis , B. Adamcová , R. Grossová

Extreme emission-line galaxies, such as blue compact dwarfs (BCDs), Green Peas (GPs) and blueberries in the local Universe are the potential candidates to understand the nature of galaxies that re-ionized the early Universe. Being low-mass,…

Astrophysics of Galaxies · Physics 2022-04-20 Abhishek Paswan , Kanak Saha , Anshuman Borgohain , Claus Leitherer , Suraj Dhiwar

Blueberry galaxies (BBs) are fainter, less massive, and lower redshift counterparts of the Green pea galaxies. They are thought to be the nearest analogues of the high redshift Lyman Alpha (Ly$\alpha$) emitters. We report the…

Astrophysics of Galaxies · Physics 2024-06-13 Saili Dutta , Apurba Bera , Omkar Bait , Chaitra A. Narayan , Biny Sebastian , Sravani Vaddi

Low-metallicity galaxies may provide key insights into the evolutionary history of galaxies. Galaxies with strong emission lines and high equivalent widths (rest-frame EW(H-beta) > 30 A) are ideal candidates for the lowest metallicity…

Astrophysics of Galaxies · Physics 2022-09-13 Isaac H. Laseter , Amy J. Barger , Lennox L. Cowie , Anthony J. Taylor

We assemble a sample of 17 low metallicity (7.45 < log(O/H)+12 < 8.12) galaxies with z < 0.1 found spectroscopically, without photometric pre-selection, in early data from the Hobby Eberly Telescope Dark Energy Experiment (HETDEX). Star…

We report here our finding of two new blueberry galaxies using optical IFU spectroscopic data from the MaNGA survey. Both the blueberries are found to be compact ($\leq$ $1 - 2$ kpc) starburst systems located at the outskirts of Low Surface…

Astrophysics of Galaxies · Physics 2021-02-17 Abhishek Paswan , Kanak Saha , Suraj Dhiwar

A population of so-called "blueberry" starbursting dwarf galaxies with extremely blue colors, low-metallicities, and enormous ionization ratios, has recently been found by Yang et al. (2017). Yet we still do not know their detailed…

Galaxies selected on the basis of their emission line strength show low metallicities, regardless of their redshifts. We conclude this from a sample of faint galaxies at redshifts between 0.6 < z < 2.4, selected by their prominent emission…

Compact star-forming galaxies were dominant galaxy types in the early Universe. Blueberry galaxies (BBs) represent their local analogues being very compact and having intensive star formation. Motivated by high X-ray emission recently found…

Astrophysics of Galaxies · Physics 2024-10-30 B. Adamcová , J. Svoboda , E. Kyritsis , K. Kouroumpatzakis , A. Zezas , P. G. Boorman , A. Borkar , M. Bílek , M. Clavel , P. -O. Petrucci

We report a method of identifying candidate low-metallicity blue compact dwarf galaxies (BCDs) from the Sloan Digital Sky Survey (SDSS) imaging data and present 3-m Lick Observatory and 10-m W.M. Keck Observatory optical spectroscopic…

Astrophysics of Galaxies · Physics 2018-07-13 Tiffany Hsyu , Ryan J. Cooke , J. Xavier Prochaska , Michael Bolte

Green Pea and Blueberry galaxies are well-known for their compact size, low mass, strong emission lines and analogs to high-z Ly{\alpha} emitting galaxies. In this study, 1547 strong [OIII]{\lambda}5007 emission line compact galaxies with…

Eighteen candidates for emission line galaxies were discovered in a narrow-band infrared survey that targeted the redshifts of damped Lyman-alpha or metal lines in the spectra of quasars. The presence of emission lines is inferred from the…

Astrophysics · Physics 2009-10-30 F. Mannucci , D. Thompson , S. V. W. Beckwith , G. M. Williger

We present a spectroscopic study of eight extremely low-metallicity candidate emission-line galaxies with oxygen abundances possibly below 12 +log O/H = 7.35. These galaxies were selected from Data Release 10 of the Sloan Digital Sky…

Astrophysics of Galaxies · Physics 2015-06-24 N. G. Guseva , Y. I. Izotov , K. J. Fricke , C. Henkel

We identify an abundant population of extreme emission line galaxies (EELGs) at redshift z~1.7 in the Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey (CANDELS) imaging from Hubble Space Telescope/Wide Field Camera 3 (HST/WFC3). 69…

We present near-infrared spectroscopy of a sample of 22 Extreme Emission Line Galaxies at redshifts 1.3 < z < 2.3, confirming that these are low-mass (M* = 10^8 - 10^9 M_sun) galaxies undergoing intense starburst episodes (M*/SFR ~ 10-100…

We describe results of a narrow band search for ultra-strong emission line galaxies (USELs) with EW(H beta) > 30 A. 542 candidate galaxies are found in a half square degree survey using two ~100 Angstrom 8150 A and 9140 A filters with…

Astrophysics · Physics 2007-05-23 Yuko Kakazu , Lennox L. Cowie , Esther M. Hu

We present discovery spectra of a sample of eight lensed galaxies at high redshift, 3.7<z<5.2, selected by their red colors in the fields of four massive clusters: A1689, A2219, A2390, and AC114. Metal absorption lines are detected and…

Astrophysics · Physics 2009-11-07 Brenda Frye , Tom Broadhurst , Narciso Benitez

Aiming to find new extremely metal-deficient star-forming galaxies we extracted from the Two-Degree Field Galaxy Redshift Survey (2dFGRS) 100K Data Release 14 emission-line galaxies with relatively strong [OIII] 4363 emission. Spectroscopic…

Astrophysics · Physics 2009-11-11 P. Papaderos , N. G. Guseva , Y. I. Izotov , K. G. Noeske , T. X. Thuan , K. J. Fricke

We present deep HST near-IR and Spitzer mid-IR observations of a large sample of spectroscopically-confirmed galaxies at z >= 6. The sample consists of 51 Lyman-alpha emitters (LAEs) at z ~ 5.7, 6.5, and 7.0, and 16 Lyman-break galaxies…

We present the faintest spectroscopically confirmed sample of redshift four and five Lyman break galaxies to date. The sample is based on slitless grism spectra of the Hubble Ultra Deep Field region from the GRAPES (Grism ACS Program for…

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