Registration Number
0225U001113,
(0124U003773)
, R & D reports
Title
The Milky Way galaxies-analogues
popup.stage_title
Вибірки галактик-аналогів Чумацького Шляху (АЧШ). 3D-кінематичні параметри ЧШ у моделі Огородникова-Мілна для різних областей зір
Head
Vavylova Iryna B., Доктор фізико-математичних наук
Registration Date
25-01-2025
Organization
Main Astronomical Observatory of the National Academy of Sciences of Ukraine
popup.description1
The project aim store search and optimize the necessary and sufficient conditions for revealing MW galaxies-analogues including our criteria. Using observational data and theoretical models, we will reveal whether there are different/single evolutionary tracks for the formation of galaxies-analogues. We will use machine learning and the obtained multiwave length parameters of galaxies-analogues as well as 3-D kinematics of the Milky Way to establish the appearance of the Galaxy from the outside.
popup.description2
A sample of ~15 million Milky Way giant and subgiant stars from the Gaia DR3 catalogue was created, located in the range of galactocentric distances 0 kpc < R < 15 kpc and azimuthal angles 115° < Θ < 245°. 3D-kinematic calculations of the parameters of the Ogorodnikov-Milne (OM) model covered by the data of this sample were performed. A sample of candidates for the MWA galaxies was created according to the criterion of spiral galaxies with a bar using the 2MIG catalogue. Cross-correlation of this sample with the AGN catalogue gave a final sample of ~250 candidates for the MWA galaxies. For this sample, the type of spectral activity of galaxies was determined and confirmed using the BPT diagram and the masses of supermassive black holes in their centres were calculated. Also, four samples of MWA galaxies were selected, which are based on different "structural" criteria. For the first time, decameter radio emission from the galaxy NGC 3521 was registered at a flux density level of 10–30 Jy. The flux density of our Galaxy was calculated assuming its location at the distance at which NGC 3521 is located.The theoretical SED model across the entire electromagnetic spectrum could serve as an indicator for identifying MWA galaxies. This hypothesis was tested for the galaxy NGC 3521 using observational data from the UV to the centimetre radio range. According to the results of the SED simulation, the model considers the contribution to the radiation of all galaxy components, assuming that the galactic core is not active. The obtained stellar mass Mstar = 2.13×1010MSun, dust mass Mdust = 8.45×107MSun and star formation rate SFR = 1.76 MSun/yr, with the corresponding value of χ2/d.o.f = 1.8. Based on the HIPASS radio data, the mass neutral hydrogen MHI = 1.3×1010MSun was estimated. Based on the ZTF data for NGC 3521 in 2018-2024, we found that the g-r colour values have a BWB trend with a Pearson coefficient of 0.56.
Product Description
popup.authors
Vasylenko Anatolii A.
Dmytrenko Artem M.
Dobrycheva Daria V.
Serhiienko Olha M.
Fedorov Petro M.
Khramtsov Vladyslav P.
popup.nrat_date
2025-01-25
