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GOALS-JWST: Unveiling Dusty Compact Sources in the Merging Galaxy IIZw096
Inami, Hanae; Böker, Torsten; Kemper, Francisca +30 more
We have used the Mid-InfraRed Instrument (MIRI) on the James Webb Space Telescope (JWST) to obtain the first spatially resolved, mid-infrared images of IIZw096, a merging luminous infrared galaxy (LIRG) at z = 0.036. Previous observations with the Spitzer Space Telescope suggested that the vast majority of the total IR luminosity (L IR)…
Stellar proper motions in the outskirts of classical dwarf spheroidal galaxies with Gaia EDR3
Pace, Andrew B.; Zivick, Paul; Riley, Alexander H. +2 more
We use Gaia EDR3 data to identify stars associated with six classical dwarf spheroidals (dSphs) (Draco, Ursa Minor, Sextans, Sculptor, Fornax, Carina) at their outermost radii, beyond their nominal King stellar limiting radius. For all of the dSphs examined, we find radial velocity matches with stars residing beyond the King limiting radius and wi…
Frontiers in accretion physics at high X-ray spectral resolution
Díaz Trigo, M.; Cappi, M.; Done, C. +14 more
Microcalorimeters have shown remarkable success in delivering high-spectral-resolution observations of the hot and energetic Universe, and have paved the way to revolutionary new science possibilities in X-ray astronomy. There are several research areas in compact-object science that can only be addressed with energy resolution ΔE ≲ 5 eV at photon…
Is There an Enormous Cold Front at the Virial Radius of the Perseus Cluster?
Fabian, A. C.; Sanders, J. S.; Walker, S. A. +3 more
We present new XMM-Newton observations extending the mosaic of the Perseus cluster out to the virial radius to the west. Previous studies with ROSAT have reported a large excess in surface brightness to the west, possibly the result of large-scale gas sloshing. In our new XMM-Newton observations we have found two X-ray surface brightness edges at …
Discovery of hot subdwarfs covered with helium-burning ash
Werner, Klaus; Reindl, Nicole; Geier, Stephan +1 more
Helium-rich subdwarf O stars (sdOs) are hot compact stars in a pre-white dwarf evolutionary state. Most of them have effective temperatures and surface gravities in the range Teff = 40 000-50 000 K and log g = 5.5-6.0. Their atmospheres are helium dominated. If present at all, C, N, and O are trace elements. The abundance patterns are e…
Kinematics of the molecular interstellar medium probed by Gaia: steep velocity dispersion-size relation, isotropic turbulence, and location-dependent energy dissipation
Li, Guang-Xing; Chen, Bing-Qiu; Zhou, Ji-Xuan
The evolution of the molecular interstellar medium is controlled by processes such as turbulence, gravity, stellar feedback, and Galactic shear. AL a part of the ISM-6D project, using Gaia astrometric measurements towards a sample of young stellar objects (YSOs), we study the morphology and kinematic structure of the associated molecular gas. We i…
Primordial black hole dark matter in the context of extra dimensions
Vincent, Aaron C.; Song, Ningqiang; Friedlander, Avi +2 more
Theories of large extra dimensions (LEDs) such as the Arkani-Hamed, Dimopoulos and Dvali scenario predict a "true" Planck scale M⋆ near the TeV scale, while the observed Mp l is due to the geometric effect of compact extra dimensions. These theories allow for the creation of primordial black holes (PBHs) in the early Universe…
Magnetosheath Jet Occurrence Rate in Relation to CMEs and SIRs
Geyer, Paul; Temmer, Manuela; Plaschke, Ferdinand +6 more
Magnetosheath jets constitute a significant coupling effect between the solar wind (SW) and the magnetosphere of the Earth. In order to investigate the effects and forecasting of these jets, we present the first-ever statistical study of the jet production during large-scale SW structures like coronal mass ejections (CMEs), stream interaction regi…
Late-onset Circumstellar Medium Interactions are Rare: An Unbiased GALEX View of Type Ia Supernovae
Shappee, Benjamin J.; Anand, Gagandeep S.; Tucker, Michael A. +2 more
Using ultraviolet (UV) light curves, we constrain the circumstellar environments of 1080 Type Ia supernovae (SNe Ia) within z < 0.5 from archival Galaxy Evolution Explorer (GALEX) observations. All SNe Ia are required to have pre- and post-explosion GALEX observations to ensure adequate subtraction of the host-galaxy flux. Using the late-time G…
Conditions for Direct Black Hole Seed Collapse near a Radio-loud Quasar 1 Gyr after the Big Bang
Overzier, Roderik A.
Observations of luminous quasars and their supermassive black holes at z ≳ 6 suggest that they formed at dense matter peaks in the early universe. However, few studies have found definitive evidence that the quasars lie at cosmic density peaks, in clear contrast with theory predictions. Here we present new evidence that the radio-loud quasar SDSS …