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The Angular Momentum of the Circumgalactic Medium in the TNG100 Simulation
Genel, Shy; Pillepich, Annalisa; Nelson, Dylan +3 more
We present an analysis of the angular momentum content of the circumgalactic medium (CGM) using TNG100, one of the flagship runs of the IllustrisTNG project. We focus on Milky Way-mass halos (∼1012 M⊙) at z = 0 but also analyze other masses and redshifts up to z = 5. We find that the CGM angular momentum properties are strong…
Validating scattering-induced (sub)millimetre disc polarization through the spectral index, wavelength-dependent polarization pattern, and polarization spectrum: the case of HD 163296
Hull, Charles L. H.; Li, Zhi-Yun; Yang, Haifeng +3 more
A number of young circumstellar discs show strikingly ordered (sub)millimetre polarization orientations along the minor axis, which is strong evidence for polarization due to scattering by ∼0.1 mm-sized grains. To test this mechanism further, we model the ALMA dust continuum and polarization data of HD 163296 using radmc-3d. We find that scatterin…
The MBHBM⋆ Project. I. Measurement of the Central Black Hole Mass in Spiral Galaxy NGC 3504 Using Molecular Gas Kinematics
Imanishi, Masatoshi; Neumayer, Nadine; Greene, Jenny E. +17 more
We present a dynamical mass measurement of the supermassive black hole (SMBH) in the nearby double-barred spiral galaxy NGC 3504 as part of the Measuring Black Holes in below Milky Way (M⋆) Mass Galaxies Project. Our analysis is based on Atacama Large Millimeter/submillimeter Array cycle 5 observations of the 12CO(2-1) emissi…
Lyman continuum escape fraction in Ly α emitters at z ≃ 3.1
Fan, Xiaohui; Bian, Fuyan
We measure the Lyman continuum (LyC) escape fraction in 54 faint Lyman-alpha emitters (LAEs) at z ≃ 3.1 in the GOODS-South field. With the average magnitude of R = 26.7 AB (MUV = -18.8 and L ≃ 0.1L*), these galaxies represent a population of compact young dwarf galaxies. Their properties are likely to resemble those in the galaxies resp…
Extended stellar systems in the solar neighborhood. IV. Meingast 1: the most massive stellar stream in the solar neighborhood
Meingast, Stefan; Alves, João; Ratzenböck, Sebastian +2 more
Context. Nearby stellar streams carry unique information on the dynamical evolution and disruption of stellar systems in the Galaxy, the mass distribution in the disk, and they provide unique targets for planet formation and evolution studies. Recently, Meingast 1, a 120° stellar stream with a length of at least 400 pc, was dicovered.
Aims: W…
Probing the origin of low-frequency radio emission in PG quasars with the uGMRT - I
Ho, L. C.; Ishwara-Chandra, C. H.; Harrison, C. +3 more
We present the results from 685 MHz observations with the upgraded Giant Metrewave Radio Telescope (uGMRT) of 22 quasars belonging to the Palomar-Green (PG) quasar sample. Only four sources reveal extended radio structures on ∼10-30 kpc scales, while the rest are largely a combination of a radio core unresolved at the uGMRT resolution of ∼3-5 arcs…
An extended Pal 5 stream in Gaia DR2
Bovy, Jo; Webb, Jeremy J.; Starkman, Nathaniel
We present the results of a detailed search for members of the Pal 5 tidal tail system in Gaia Data Release 2 (DR2). Tidal tails provide a sensitive method for measuring the current and past gravitational potential of their host galaxy as well as for testing predictions for the abundance of dark matter subhaloes. The Pal 5 globular cluster and its…
Distribution of star formation in galactic bars as seen with Hα and stacked GALEX UV imaging
Knapen, J. H.; Comerón, S.; Salo, H. +3 more
Context. Stellar bars are known to gradually funnel gas to the central parts of disk galaxies. It remains a matter of debate why the distribution of ionized gas along bars and in the circumnuclear regions varies among galaxies.
Aims: Our goal is to investigate the spatial distribution of star formation (SF) within bars of nearby low-inclinati…
Martian Water Ice Clouds During the 2018 Global Dust Storm as Observed by the ACS-MIR Channel Onboard the Trace Gas Orbiter
Montmessin, F.; Fedorova, A.; Korablev, O. +8 more
The Atmospheric Chemistry Suite (ACS) instrument onboard the ExoMars Trace Gas Orbiter (TGO) European Space Agency-Roscosmos mission began science operations in March 2018. ACS Mid-InfraRed (MIR) channel notably provides solar occultation observations of the Martian atmosphere in the 2.3- to 4.2-µ m spectral range. Here, we use these observa…
Fine Structure of a Solar Type II Radio Burst Observed by LOFAR
Zucca, Pietro; Vocks, Christian; Mann, Gottfried +6 more
Shock waves in the solar corona are closely associated with coronal mass ejections and flares. The longest-known and frequently studied signatures of coronal shock waves are metric type II radio bursts, which provide information on the shock driver and ambient plasma conditions. We report on outstanding high frequency/time resolution LOw Frequency…