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Early Results from GLASS-JWST. XXII. Rest-frame UV-Optical Spectral Properties of Lyα Emitting Galaxies at 3 < z < 6
Pentericci, Laura; Treu, Tommaso; Scarlata, Claudia +13 more
Lyα emission is possibly the best indirect diagnostic of Lyman continuum (LyC) escape since the conditions that favor the escape of Lyα photons are often the same that allow for the escape of LyC photons. In this work, we present the rest-frame UV-optical spectral characteristics of 11 Lyα emitting galaxies at 3 < z < 6-the redshift range th…
Vertical motion in the Galactic disc: unwinding the snail
Bovy, Jo; Hogg, David W.; Tremaine, Scott +1 more
The distribution of stars in the Milky Way disc shows a spiral structure - the snail - in the space of velocity and position normal to the Galactic mid-plane. The snail appears as straight lines in the vertical frequency-vertical phase plane when effects from sample selection are removed. Their slope has the dimension of inverse time, with the sim…
CO Emission, Molecular Gas, and Metallicity in Main-sequence Star-forming Galaxies at z ∼ 2.3
Siana, Brian; Shapley, Alice E.; Reddy, Naveen A. +9 more
We present observations of CO(3-2) in 13 main-sequence z = 2.0-2.5 star-forming galaxies at $\mathrm{log}({M}_{* }/{M}_{\odot })=10.2\mbox{--}10.6$ that span a wide range in metallicity (O/H) based on rest-optical spectroscopy. We find that ${L}_{\mathrm{CO}(3-2)}^{{\prime} }$ /SFR decreases with decreasing metallicity, implying that the CO lumino…
Nuclear high-ionisation outflow in the Compton-thick AGN NGC 6552 as seen by the JWST mid-infrared instrument
Colina, L.; Brandl, B. R.; Kavanagh, P. J. +17 more
Context. During the commissioning of the James Webb Space Telescope (JWST), the mid-infrared instrument (MIRI) observed NGC 6552 with the MIRI Imager and the Medium-Resolution Spectrograph (MRS). NGC 6552 is an active galactic nucleus (AGN) at a redshift of 0.0266 (DL = 120 Mpc) classified as a Seyfert 2 nucleus in the optical and Compt…
The two rings of (50000) Quaoar
Alcock, C.; Lehner, M. J.; Tatsumi, E. +66 more
Context. Quaoar is a classical trans-Neptunian object (TNO) with an area-equivalent diameter of 1100 km and an orbital semi-major axis of 43.3 astronomical units. Based on stellar occultations observed between 2018 and 2021, an inhomogeneous ring (Q1R, i.e., Quaoar's first ring) has been detected around this body.
Aims: A new stellar occultat…
The Hot Circumgalactic Medium of the Milky Way: New Insights from XMM-Newton Observations
Mathur, Smita; Gupta, Anjali; Das, Sanskriti +2 more
We present XMM-Newton observations around the sight line of Mrk 421. The emission spectrum of the Milky Way (MW) circumgalactic medium (CGM) shows that a two-phase model is a better fit to the data compared to a single-phase model; in addition to the warm-hot virial phase at log (T/K) = 6.30 ± 0.02, a hot super-virial phase at log (T/K) = ${6.88}_…
An 18.9 min blue large-amplitude pulsator crossing the `Hertzsprung gap' of hot subdwarfs
Filippenko, Alexei V.; Esamdin, Ali; Wang, Xiaofeng +28 more
Blue large-amplitude pulsators (BLAPs) represent a new and rare class of hot pulsating stars with unusually large amplitudes and short periods. The evolutionary path that could give rise to such kinds of stellar configurations is unclear. Here we report a comprehensive study of the peculiar BLAP discovered by the Tsinghua University-Ma Huateng Tel…
What Does the Milky Way Look Like?
Hao, C. J.; Xu, Y.; Hou, L. G. +5 more
In spite of much work, the overall spiral structure morphology of the Milky Way remains somewhat uncertain. In the last two decades, accurate distance measurements have provided us with an opportunity to solve this issue. Using the precise locations of very young objects, for the first time, we propose that our galaxy has a multiple-arm morphology…
Spectral shapes of the Ly α emission from galaxies - II. The influence of stellar properties and nebular conditions on the emergent Ly α profiles
Scarlata, Claudia; Rivera-Thorsen, T. Emil; Gronke, Max +2 more
We demonstrate how the stellar and nebular conditions in star-forming galaxies modulate the emission and spectral profile of H I Ly α emission line. We examine the net Ly α output, kinematics, and in particular emission of blueshifted Ly α radiation, using spectroscopy from with the Cosmic Origins Spectrograph on Hubble Space Telescope (HST), givi…
Hunting for dark matter and new physics with GECCO
Moiseev, A. A.; Profumo, Stefano; Baring, Matthew G. +9 more
We outline the science opportunities in the areas of searches for dark matter and new physics offered by a proposed future MeV gamma-ray telescope, the Galactic Explorer with a Coded Aperture Mask Compton Telescope (GECCO). We point out that such an instrument would play a critical role in opening up a discovery window for particle dark matter wit…