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Burton's Curse: The Impact of Bulk Flows on the Galactic Longitude-Velocity Diagram and the Illusion of a Continuous Perseus Arm
Peek, J. E. G.; Tchernyshyov, Kirill; Miville-Deschenes, Marc-Antoine
In this work, we demonstrate that the Perseus Arm is not a continuous structure of molecular gas in the second quadrant. We first show that the observed, distanced-resolved velocity structure of the Galaxy in the outer disk is capable of creating illusory spiral arms, as was first proposed by Burton. Second, we measure the distances to a collectio…
More Evidence for Variable Helium Absorption from HD 189733b
Redfield, Seth; Knutson, Heather A.; France, Kevin +5 more
We present a new Keck/NIRSPEC observation of metastable helium absorption from the upper atmosphere of HD 189733b, a hot Jupiter orbiting a nearby moderately active star. We measure an average helium transit depth of 0.420% ± 0.013% integrated over the [-20, 20] km s-1 velocity range. Comparing this measurement to eight previously publi…
The period-age relation of long-period variables
Mowlavi, N.; Trabucchi, M.
Context. Pieces of empirical evidence suggest the existence of a period-age relation for long-period variables (LPVs). Yet, this property has hardly been studied on theoretical grounds thus far.
Aims: We aim to examine the period-age relation using the results from recent nonlinear pulsation calculations.
Methods: We combined isochrone m…
Energetic transients joint analysis system for multi-INstrument (ETJASMIN) for GECAM - I. Positional, temporal, and spectral analyses
Gao, Min; Gong, Ke; Qiao, Rui +67 more
Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) is a dedicated mission, launched in December 2020, for gamma-ray transients, including gamma-ray bursts (GRBs) and soft gamma repeater (SGR) bursts in the multimessenger and multiwavelength astronomy era. Since GECAM consists of two independent spacecrafts (or say i…
The Compact Structures of Massive z ∼ 0.7 Post-starburst Galaxies in the SQuIGG$\vec{L}$E Sample
Bezanson, Rachel; Kriek, Mariska; Greene, Jenny E. +9 more
We present structural measurements of 145 spectroscopically selected intermediate-redshift (z ~ 0.7), massive (M ⋆ ~ 1011 M ⊙) post-starburst galaxies from the $\mathrm{SQuIGG}\vec{L}{\rm{E}}$ sample measured using wide-depth Hyper Suprime-Cam i-band imaging. This deep imaging allows us to probe the sizes and struc…
Correlated Spatio-temporal Evolution of Extreme-Ultraviolet Ribbons and Hard X-Rays in a Solar Flare
Qiu, J.; Antiochos, S. K.; Drake, J. F. +4 more
We analyze the structure and evolution of ribbons from the M7.3 SOL2014-04-18T13 flare using ultraviolet images from the Interface Region Imaging Spectrograph and the Solar Dynamics Observatory (SDO)/Atmospheric Imaging Assembly (AIA), magnetic data from the SDO/Helioseismic and Magnetic Imager, hard X-ray (HXR) images from the Reuven Ramaty High …
The eROSITA view of the Abell 3391/95 field: The Northern Clump. The largest infalling structure in the longest known gas filament observed with eROSITA, XMM-Newton, and Chandra
Sanders, Jeremy S.; Reiprich, Thomas H.; Koribalski, Bärbel S. +18 more
Context. Galaxy clusters grow through mergers and the accretion of substructures along large-scale filaments. Many of the missing baryons in the local Universe may reside in such filaments as the warm-hot intergalactic medium (WHIM).
Aims: SRG/eROSITA performance verification observations revealed that the binary cluster Abell 3391/3395 and t…
Modeling intrinsic galaxy alignment in the MICE simulation
Carretero, Jorge; Castander, Francisco J.; DES Collaboration +9 more
The intrinsic alignment (IA) of galaxies is potentially a major limitation in deriving cosmological constraints from weak lensing surveys. In order to investigate this effect, we assign intrinsic shapes and orientations to galaxies in the light-cone output of the MICE simulation, spanning ∼5000 deg2 and reaching redshift z =1.4 . This a…
The Cetus-Palca stream: A disrupted small dwarf galaxy. A prequel to the science possible with WEAVE with precise spectro-photometric distances
Thomas, Guillaume F.; Battaglia, Giuseppina
We present a new fully data-driven approach to derive spectro-photometric distances based on artificial neural networks. The method was developed and tested on Sloan Extension for Galactic Understanding and Exploration survey (SEGUE) data and will serve as a reference for the Contributed Data Product SPDIST of the William Hershel Telescope Enhance…
HILIGT, Upper Limit Servers II - Implementing the data servers
Freyberg, M. J.; Wilms, J.; Savchenko, V. +7 more
The High-Energy Lightcurve Generator (HILIGT) is a new web-based tool which allows the user to generate long-term lightcurves of X-ray sources. It provides historical data and calculates upper limits from image data in real-time. HILIGT utilizes data from twelve satellites, both modern missions such as XMM-Newton and Swift, and earlier facilities …