Radio properties of green pea galaxies

J 2024

Radio properties of green pea galaxies

BORKAR, A., Romana GROSSOVÁ, J. SVOBODA, E. MORAVEC, K. KOUROUMPATZAKIS et. al.

Základní údaje

Originální název

Radio properties of green pea galaxies

Autoři

BORKAR, A., Romana GROSSOVÁ (703 Slovensko, domácí), J. SVOBODA, E. MORAVEC, K. KOUROUMPATZAKIS, P. G. BOORMAN, B. ADAMCOVA, B. MINGO a M. EHLE

Vydání

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

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Francie

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL URL

Impakt faktor

Impact factor: 6.500 v roce 2022

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.1051/0004-6361/202348819

UT WoS

001263273200008

Klíčová slova anglicky

galaxies: dwarf; galaxies: starburst; galaxies: star formation; radio continuum: galaxies

Štítky

rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 7. 8. 2024 10:19, Mgr. Marie Šípková, DiS.

Anotace

V originále

Aims. Green peas (GPs) are young, compact, star-forming dwarf galaxies, and local (z ∼ 0.3) analogues of the early galaxies (z ≥ 6) considered to be mainly responsible for the reionisation of the Universe. Recent X-ray observations of GPs led to the detection of high excess emission, which cannot be accounted for by star formation alone and implies the presence of an active galactic nucleus (AGN). We employ radio observations to study the radio properties of GPs, build their radio spectral energy distributions, and verify the presence of AGNs. Methods. We performed new radio observations of three GPs with the Karl G. Jansky Very Large Array (JVLA) in the L, C, and X bands (1.4, 6 and 10 GHz resp.), and analysed them alongside data from archival observations and large radio surveys. We also analysed the archival radio data for a larger sample of GPs and blueberry (BBs) galaxies, which are lower-mass and lower-redshift analogues of the GPs. To understand the significance of the radio observations, we assess the detectability of these sources, and compare the detected radio luminosities with expectations from theoretical and empirical relations. Results. Two of the three targeted GPs are strongly detected (> 10σ) in the JVLA observations and their fluxes are consistent with star formation, while the third source is undetected. Although archival radio surveys have the sensitivity to detect a large fraction (∼75%) of the sources from the larger archival sample of GPs and BBs, we only detect a small number (< 40%) of them and their radio luminosity is significantly lower than the expectation from empirical relations. Conclusions. Our results show that the majority of the dwarf galaxies in our sample are highly underluminous. The radio luminosity–star formation rate (SFR) relation deviates from the empirical relations, especially towards the lower end of galaxy mass and SFR, suggesting that the relations established for larger galaxies may not hold towards the low-mass end.

Citovat

BORKAR, A., Romana GROSSOVÁ, J. SVOBODA, E. MORAVEC, K. KOUROUMPATZAKIS, P. G. BOORMAN, B. ADAMCOVA, B. MINGO a M. EHLE. Radio properties of green pea galaxies. Astronomy and Astrophysics. EDP Sciences, 2024, roč. 687, July 2024, s. 1-9. ISSN 0004-6361. Dostupné z: https://dx.doi.org/10.1051/0004-6361/202348819.

@article{2421879,
   author = {Borkar, A. and Grossová, Romana and Svoboda, J. and Moravec, E. and Kouroumpatzakis, K. and Boorman, P. G. and Adamcova, B. and Mingo, B. and Ehle, M.},
   article_number = {July 2024},
   doi = {http://dx.doi.org/10.1051/0004-6361/202348819},
   keywords = {galaxies: dwarf; galaxies: starburst; galaxies: star formation; radio continuum: galaxies},
   language = {eng},
   issn = {0004-6361},
   journal = {Astronomy and Astrophysics},
   title = {Radio properties of green pea galaxies},
   url = {https://ui.adsabs.harvard.edu/abs/2024A%26A...687A.137B/abstract},
   volume = {687},
   year = {2024}
}

TY  - JOUR
ID  - 2421879
AU  - Borkar, A. - Grossová, Romana - Svoboda, J. - Moravec, E. - Kouroumpatzakis, K. - Boorman, P. G. - Adamcova, B. - Mingo, B. - Ehle, M.
PY  - 2024
TI  - Radio properties of green pea galaxies
JF  - Astronomy and Astrophysics
VL  - 687
IS  - July 2024
SP  - 1-9
EP  - 1-9
PB  - EDP Sciences
SN  - 00046361
KW  - galaxies: dwarf
KW  - galaxies: starburst
KW  - galaxies: star formation
KW  - radio continuum: galaxies
UR  - https://ui.adsabs.harvard.edu/abs/2024A%26A...687A.137B/abstract
N2  - Aims. Green peas (GPs) are young, compact, star-forming dwarf galaxies, and local (z ∼ 0.3) analogues of the early galaxies (z ≥ 6) considered to be mainly responsible for the reionisation of the Universe. Recent X-ray observations of GPs led to the detection of high excess emission, which cannot be accounted for by star formation alone and implies the presence of an active galactic nucleus (AGN). We employ radio observations to study the radio properties of GPs, build their radio spectral energy distributions, and verify the presence of AGNs. Methods. We performed new radio observations of three GPs with the Karl G. Jansky Very Large Array (JVLA) in the L, C, and X bands (1.4, 6 and 10 GHz resp.), and analysed them alongside data from archival observations and large radio surveys. We also analysed the archival radio data for a larger sample of GPs and blueberry (BBs) galaxies, which are lower-mass and lower-redshift analogues of the GPs. To understand the significance of the radio observations, we assess the detectability of these sources, and compare the detected radio luminosities with expectations from theoretical and empirical relations. Results. Two of the three targeted GPs are strongly detected (> 10σ) in the JVLA observations and their fluxes are consistent with star formation, while the third source is undetected. Although archival radio surveys have the sensitivity to detect a large fraction (∼75%) of the sources from the larger archival sample of GPs and BBs, we only detect a small number (< 40%) of them and their radio luminosity is significantly lower than the expectation from empirical relations. Conclusions. Our results show that the majority of the dwarf galaxies in our sample are highly underluminous. The radio luminosity–star formation rate (SFR) relation deviates from the empirical relations, especially towards the lower end of galaxy mass and SFR, suggesting that the relations established for larger galaxies may not hold towards the low-mass end.
ER  -

BORKAR, A., Romana GROSSOVÁ, J. SVOBODA, E. MORAVEC, K. KOUROUMPATZAKIS, P. G. BOORMAN, B. ADAMCOVA, B. MINGO a M. EHLE. Radio properties of green pea galaxies. \textit{Astronomy and Astrophysics}. EDP Sciences, 2024, roč.~687, July 2024, s.~1-9. ISSN~0004-6361. Dostupné z: https://dx.doi.org/10.1051/0004-6361/202348819.

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