Two regimes of galaxy dynamics: mass models of NGC 5055 and DDO 154

Jovanović, M.

doi:10.1093/mnras/stx1009

Cited by 2 publications

(1 citation statement)

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“…The large quantities of DM in spiral galaxies are well documented (see e.g., Bertin 2014): the studies of their rotation curves (RCs) which provide rotation velocity as a function of the disk radius and which remain constant at large galactocentric distances (see e.g., Sofue and Rubin 2001) provided a plethora of evidence for this. The available data such as the THINGS 1 (The HI Nearby Galaxy Survey) database (Walter et al 2008) allow for various studies of DM in nearby spirals: for example, Jovanović (2017) analyzed the spiral galaxy NGC 5055, and also dwarf irregular galaxy DDO 154, using THINGS to examine their RCs and 3.6 μm images from the Spitzer Survey of Stellar Structure in Galaxies 2 (S4G, Sheth et al 2010) database to obtain the dynamical mass of the stellar component.…”

Section: Introductionmentioning

confidence: 99%

Dark matter in massive early-type galaxies: 100 years of the jeans equations

Samurovic

2019

SERBIAN ASTRON J

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In 1919 James Jeans published the book Problems of Cosmogony and Stellar Dynamics in which he summarized his work on dynamics of stellar systems based on his papers published from 1915 onwards. To mark the centenary of this publication we present here one application of his work relevant for contemporary research of galaxies: we analyze the problem of dark matter in massive early-type galaxies (ellipticals and lenticulars) using various available observational data. After discussing the basics of the Jeans equations we study their application on the integrated stellar spectra of galaxies, planetary nebula data and, especially, globular cluster data. We rely on both Newtonian and MOND frameworks and show their advantages and drawbacks. To infer the contribution of the dark component in early-type galaxies we rely on several stellar population synthesis models. It is shown that dark matter does not dominate in the inner regions of early-type galaxies, but becomes more important beyond three effective radii.

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Section: Introductionmentioning

confidence: 99%

Dark matter in massive early-type galaxies: 100 years of the jeans equations

Samurovic

2019

SERBIAN ASTRON J

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The ISM Properties and Gas Kinematics of a Redshift 3 Massive Dusty Star-forming Galaxy

Leung

Riechers

Baker

et al. 2019

ApJ

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We present CO (J = 1→0; 3→2; 5→4; 10→9) and 1.2-kpc resolution [CII] line observations of the dusty starforming galaxy (SFG) HXMM05 -carried out with the Karl G. Jansky Very Large Array, the Combined Array for Research in Millimeter-wave Astronomy, the Plateau de Bure Interferometer, and the Atacama Large Millimeter/submillimeter Array, measuring an unambiguous redshift of z = 2.9850 ± 0.0009. We find that HXMM05 is a hyper-luminous infrared galaxy (L IR = (4 ± 1)×10 13 L ) with a total molecular gas mass of (2.1 ± 0.7)×10 11 (α CO /0.8) M . The CO (J = 1 → 0) and [CII] emission are extended over ∼9 kpc in diameter, and the CO line FWHM exceeds 1100 km s −1 . The [CII] emission shows a monotonic velocity gradient consistent with a disk, with a maximum rotation velocity of v c = 616 ± 100 km s −1 and a dynamical mass of (7.7 ± 3.1)×10 11 M . We find a star formation rate (SFR) of 2900 +750 −595 M yr −1 . HXMM05 is thus among the most intensely star-forming galaxies known at high redshift. Photo-dissociation region modeling suggests physical conditions similar to nearby SFGs, showing extended star formation, which is consistent with our finding that the gas and dust emission are co-spatial. Its molecular gas excitation resembles the local major merger Arp 220. The broad CO and [CII] lines and a pair of compact dust nuclei suggest the presence of a late-stage major merger at the center of the extended disk, again reminiscent of Arp 220. The observed gas kinematics and conditions together with the presence of a companion and the pair of nuclei suggest that HXMM05 is experiencing multiple mergers as a part of the evolution. 15 The orientation of the HST image of HXMM05 shown in Figure 3 of Calanog et al. (2014); Bussmann et al. ( 2015) is incorrect (i.e., North is down instead of up), but the correct locations of all galaxies were used in the lens modeling.

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Two regimes of galaxy dynamics: mass models of NGC 5055 and DDO 154

Cited by 2 publications

References 56 publications

Dark matter in massive early-type galaxies: 100 years of the jeans equations

Dark matter in massive early-type galaxies: 100 years of the jeans equations

The ISM Properties and Gas Kinematics of a Redshift 3 Massive Dusty Star-forming Galaxy

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