J 2024

Blueberry galaxies up to 200 Mpc and their optical and infrared properties

KOUROUMPATZAKIS, K., J. SVOBODA, A. ZEZAS, A. BORKAR, E. KYRITSIS et. al.

Basic information

Original name

Blueberry galaxies up to 200 Mpc and their optical and infrared properties

Authors

KOUROUMPATZAKIS, K., J. SVOBODA, A. ZEZAS, A. BORKAR, E. KYRITSIS, P. G. BOORMAN, C. DAOUTIS, B. ADAMCOVA and Romana GROSSOVÁ (703 Slovakia, belonging to the institution)

Edition

Astronomy and Astrophysics, EDP Sciences, 2024, 0004-6361

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10308 Astronomy

Country of publisher

France

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

Impact factor

Impact factor: 6.500 in 2022

Organization unit

Faculty of Science

DOI

UT WoS

001291438500002

Keywords in English

galaxies: dwarf; galaxies: general; galaxies: ISM; galaxies: starburst; galaxies: star formation; galaxies: stellar content

Tags

Tags

International impact, Reviewed
Změněno: 30/8/2024 15:52, Mgr. Marie Šípková, DiS.

Abstract

V originále

Context. 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 light, limiting our understanding of their complete properties. Therefore, it is still paramount to study their local analogs, the green pea (GP) and blueberry (BB) galaxies. Aims. This work aims to expand our knowledge of BBs by identifying a new sample that is closer and in the southern sky. Methods. In addition to the already known BBs, this new sample will allow for a statistically significant study of their properties probed by visible and infrared (IR) light. By utilizing the HECATE catalog, which provides optical and IR photometry and characterization of galaxies, along with data from Pan-STARSS and SDSS, this study selects and analyzes a new sample of BBs. We employed spectral energy distribution fitting to derive homogeneous measurements of star-formation rates and stellar masses. Additionally, we measured emission-line fluxes, including He II λ4686, through spectral fitting. Results. Through this work, we identified 48 BBs, of which 40 were first recognized as such, with the nearest at 19 Mpc. Fourteen of the BBs are in the south sky. The BBs tend to be extremely IR red in both WISE W1 – W2 and W2 – W3 colors, distinguishing them from typical SFGs. Dwarf SFGs with higher specific star-formation rates tend to have redder IR colors. Conclusions. Blueberry galaxies stand out as the most intensely star-forming sources in the local Universe among dwarf galaxies. They are intrinsically bluer in visible light, redder in the infrared, and less massive. They also have higher specific star-formation rates, equivalent widths, lower metallicities, and the most strongly ionized interstellar medium compared to typical SFGs and GPs.