CONSTRAINTS ON THE POPULATION OF GALACTIC OBJECTS IN THE JWST UNCOVER SURVEY CATALOGUE
Section: PHYSICS OF GALAXIES AND COSMOLOGY
Authors:
1.
Department of Computer Science, St. Petersburg State University
2.
St. Petersburg Branch of the Special Astrophysical Observatory of the Russian Academy of Sciences
3.
Saint Petersburg State University of Aerospace Instrumentation
Type:
Сonference article
Published:
27.12.2024
Subject area:
UDK 52
UDK 53
UDK 520
UDK 521
UDK 523
UDK 524
UDK 52-1
UDK 52-6
GRNTI 41.00
GRNTI 29.35
GRNTI 29.31
GRNTI 29.33
GRNTI 29.27
GRNTI 29.05
OKSO 03.06.01
OKSO 03.05.01
OKSO 03.04.03
BBK 2
BBK 223
TBK 614
TBK 6135
BISAC SCI004000 Astronomy
BISAC SCI005000 Physics / Astrophysics
UDK 53
UDK 520
UDK 521
UDK 523
UDK 524
UDK 52-1
UDK 52-6
GRNTI 41.00
GRNTI 29.35
GRNTI 29.31
GRNTI 29.33
GRNTI 29.27
GRNTI 29.05
OKSO 03.06.01
OKSO 03.05.01
OKSO 03.04.03
BBK 2
BBK 223
TBK 614
TBK 6135
BISAC SCI004000 Astronomy
BISAC SCI005000 Physics / Astrophysics
Language:
English
Keywords:
cosmology: observations; galaxies: distances and redshifts
Abstract (English):
The paper assesses the potential galactic nature of small distant objects (also known as ``little red dots'') in the SUPER galaxy catalogue of the James Webb Space Telescope (JWST) UNCOVER survey. The estimate is based on the assumption that these objects could be brown dwarfs or similar objects with temperatures of a few hundred degrees – if the radiation from the low-temperature bodies was interpreted as the photometric redshift of a typical galaxy. The hypothetical number density of these objects in our galaxy is calculated, such as to match the observed number of ``little red dots'' in the survey. The physical possibility of having this number density in our Galaxy is discarded as contradictory to the dynamical constraints based on the halo mass of our Galaxy estimated elsewhere.
The paper assesses the potential galactic nature of small distant objects (also known as ``little red dots'') in the SUPER galaxy catalogue of the James Webb Space Telescope (JWST) UNCOVER survey. The estimate is based on the assumption that these objects could be brown dwarfs or similar objects with temperatures of a few hundred degrees – if the radiation from the low-temperature bodies was interpreted as the photometric redshift of a typical galaxy. The hypothetical number density of these objects in our galaxy is calculated, such as to match the observed number of ``little red dots'' in the survey. The physical possibility of having this number density in our Galaxy is discarded as contradictory to the dynamical constraints based on the halo mass of our Galaxy estimated elsewhere.
Keywords:
cosmology: observations; galaxies: distances and redshifts
cosmology: observations; galaxies: distances and redshifts
1. Bezanson R., Labbe I., Whitaker K. E., et al., 2022, arXiv:2212.04026
2. Lovyagin N., Raikov A., Yershov V., et al., 2022, Galaxies, 10, id. 108
3. Ou X., Eilers A.-C., Necib L., et al., 2024, MNRAS, 528, p. 693
4. Watkins L.L., van der Marel R.P., Sohn S.T., et al., 2019, ApJ, 873, id. 118
5. Weaver J.R., Cutler S.E., Pan R., et al., 2024, ApJ Suppl. Ser., 270, id. 7
