Title (srp)

Određivanje barionske funkcije mase za uzorak bliskih galaksija : doktorska disertacija

Author

Jovanović, Milena M., 1981-

Contributor

Samurović, Srđan, 1966-
Ćirković, Milan M., 1971-
Atanacković, Olga, 1959-
Urošević, Dejan, 1970-
Ninković, Slobodan, 1950-

Description (eng)

The subject of this thesis is a precise determination of the Baryonic Mass Function(BMF) for a representative sample of nearby galaxies, where BMF stands forthe distribution of the galaxies’ baryonic masses. Detailed dynamical models werederived for a sample of galaxies based on the publicly available THINGS (The HINearby Galaxy Survey) survey, based on the the 21 cm emission line of atomichydrogen hi.THINGS rotation curves, that reflect dynamical mass, were fitted by the sum ofthe contributions from the stellar component, neutral atomic gas, and dark matterfor 20 THINGS galaxies. The mass of stellar components is measured from theSpitzer photometry in the 3.6 m band, while the amount of atomic gas is deriveddirectly from the radio observations in THINGS. For the assumed dark matter distributionwe used the observationally motivated pseudo-isothermal profile (ISO) andthe Navarro-Frenk-White (NFW) profile based on the CDM cosmological model.Dynamical modeling of the total mass was performed with free scaling of thestellar component contribution (mass-to-light ratio, M=L), and also with the sameparameter fixed on a value consistent with stellar evolution population models. Convergenceof the fitting procedure was reached for all the dynamical models with thefree mass-to-light ratio, while the modeling with the fixed ratio was successful for 16objects. The mass of the stellar component, gas, dark matter, baryonic, and totalmass, were derived for the sample of galaxies and the aforementioned four sets ofdynamical models (two dark matter models with both free and fixed M=L values).The total BMF is constructed by summing the masses of the baryonic components(stars and gas) for galaxies in the given range of galactic masses.Furthermore, we discuss how typical our Galactic neighborhood and our Galaxy,the Milky Way, as a giant spiral, are in terms of component masses and their placeon the global (and local) BMF.

Description (srp)

Predmet ove disertacije je precizno odreživanje barionske funkcije mase (daljeBFM) za reprezentativni uzorak bliskih galaksija, gde BFM galaksija predstavljaraspodelu galaksija po barionskoj masi. Izvodimo detaljne dinamicke modele zaosnovni uzorak galaksija koji se bazira na javno dostupnim podacima iz pregledaTHINGS (The HI Nearby Galaxy Survey), što je pregled emisije atomskog vodonikahi u liniji na talasnoj dužini od 21 cm.THINGS rotacione krive, koje predstavljaju dinamicku masu, fitujemo ukupnimdoprinosom zvezda, neutralnog gasa i tamne materije za 20 galaksija iz uzorka. Masazvezdanih komponenti procenjena je iz fotometrije na 3.6 m sa misije Spitzer, akolicina atomskog gasa sledi iz THINGS radio-posmatranja. Za pretpostavljenu raspodelutamne materije koristili smo posmatracki motivisan pseudo-izotermalni profil(ISO), i Navaro-Frenk-Vajt (NFW) profil zasnovan na opšteprihvacenom CDM kosmološkommodelu. Dinamicko modelovanje ukupne mase uraženo je sa slobodnimparametrom skaliranja, tzv. odnosom masa-sjaj, M=L, kao i sa procenom istog parametraiz evolucionih modela zvezdanih populacija. Postignuta je konvergencijafita za sve modele sa slobodnim odnosom masa-sjaj, dok je modelovanje sa fiksnimodnosom postignuto za 16 objekta. Iz pomenuta cetiri skupa modela (dva profilatamne materije sa slobodnim i fiksiranim M=L parametrom) proizlaze mase zvezdanihkomponenti, gasa, tamne materije, barionska, kao i ukupna masa galaksija izuzorka.Ukupna BFM se dobija sabiranjem barionskih cinioca (zvezda i gasa) za galaksijeiz zadatog raspona galaktickih masa.Razmatramo tipicnost naše Galakticke okoline i Mlecnog puta kao velike spiralnegalaksije, u pogledu mase komponenata i položaja na globalnoj (i lokalnoj) BFM.

Description (srp)

astrofizika / vangalakticka astronomija Datum odbrane: 29.09.2021. astrophysics / extragalactic astronomy

Object languages

Serbian

Date

2021

Rights

© All rights reserved

Subject

OSNO - Opšta sistematizacija naučnih oblasti, Zvezdani sistemi. Vasiona. Kosmologija

galaxies: kinematics and dynamics, galaxies: mass function, galaxies: stellar component, dark matter, Galaxy: fundamental parameters

Identifiers