{"title":"Satellites around Edge-on Galaxies. I. Dynamical Masses","authors":"","doi":"10.1134/s1990341323600230","DOIUrl":null,"url":null,"abstract":"<span> <h3>Abstract</h3> <p>We have undertaken a search for satellites around edge-on galaxies in the EGIPS catalog, which contains 16 551 objects with declinations above <span> <span>\\(-30^{\\circ}\\)</span> </span>. We searched for systems with a central galaxy dominating in brightness by at least <span> <span>\\(1^{\\textrm{m}}\\)</span> </span> compared to its companions. As a result, we discovered 1097 candidate satellites around 764 EGIPS galaxies with projected distances less than 500 kpc and a radial velocity difference less than 300 km s<span> <span>\\({}^{-1}\\)</span> </span>. Of these, 757 satellites around 547 central galaxies have radial velocity accuracies higher than 20 km s<span> <span>\\({}^{-1}\\)</span> </span> and satisfy the gravitationally bound condition. The ensemble of satellites is characterized by an average projected distance of 84 kpc and an average radial velocity dispersion of 103 km s<span> <span>\\({}^{-1}\\)</span> </span>. Treating small satellites as test particles moving on isotropic orbits around central EGIPS galaxies, we determined the projected (orbital) masses of the edge-on galaxies. Within the luminosity range of <span> <span>\\(1.3\\times 10^{10}\\)</span> </span> to <span> <span>\\(42\\times 10^{10}\\)</span> </span> <span> <span>\\(L_{\\odot}\\)</span> </span>, the total mass of the systems is well described by a linear dependence <span> <span>\\(\\log M_{p}\\propto 0.88\\log\\left\\langle L_{K}\\right\\rangle_{\\textrm{g}}\\)</span> </span> with an average total mass-to-<span> <span>\\(K\\)</span> </span>-band luminosity equal to <span> <span>\\((17.5\\pm 0.8) M_{\\odot}/L_{\\odot}\\)</span> </span>, which is typical for nearby spiral galaxies such as the Milky Way, M 31 and M 81.</p> </span>","PeriodicalId":478,"journal":{"name":"Astrophysical Bulletin","volume":null,"pages":null},"PeriodicalIF":1.3000,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Astrophysical Bulletin","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1134/s1990341323600230","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}
引用次数: 0
Abstract
We have undertaken a search for satellites around edge-on galaxies in the EGIPS catalog, which contains 16 551 objects with declinations above \(-30^{\circ}\). We searched for systems with a central galaxy dominating in brightness by at least \(1^{\textrm{m}}\) compared to its companions. As a result, we discovered 1097 candidate satellites around 764 EGIPS galaxies with projected distances less than 500 kpc and a radial velocity difference less than 300 km s\({}^{-1}\). Of these, 757 satellites around 547 central galaxies have radial velocity accuracies higher than 20 km s\({}^{-1}\) and satisfy the gravitationally bound condition. The ensemble of satellites is characterized by an average projected distance of 84 kpc and an average radial velocity dispersion of 103 km s\({}^{-1}\). Treating small satellites as test particles moving on isotropic orbits around central EGIPS galaxies, we determined the projected (orbital) masses of the edge-on galaxies. Within the luminosity range of \(1.3\times 10^{10}\) to \(42\times 10^{10}\)\(L_{\odot}\), the total mass of the systems is well described by a linear dependence \(\log M_{p}\propto 0.88\log\left\langle L_{K}\right\rangle_{\textrm{g}}\) with an average total mass-to-\(K\)-band luminosity equal to \((17.5\pm 0.8) M_{\odot}/L_{\odot}\), which is typical for nearby spiral galaxies such as the Milky Way, M 31 and M 81.
期刊介绍:
Astrophysical Bulletin is an international peer reviewed journal that publishes the results of original research in various areas of modern astronomy and astrophysics, including observational and theoretical astrophysics, physics of the Sun, radio astronomy, stellar astronomy, extragalactic astronomy, cosmology, and astronomy methods and instrumentation.