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Global Spatial Distribution of Hack's Law Exponent on Mars Consistent With Early Arid Climate
Luo, W.; Howard, A. D.; Craddock, R. A. +2 more
Widespread valley networks (VNs) on Mars and other evidence point to an early warm and wet climate. However, ongoing debates still exist about VN's formation processes and associated climatic conditions. The power law relationship between basin length and area (Hack's Law) can be diagnostic of different fluvial processes related to climatic condit…
Circumgalactic Medium at High Halo Masses-Signatures of Cold Gas Depletion in Luminous Red Galaxies
Smailagić, Marijana; Prochaska, Jason Xavier; Burchett, Joseph +1 more
We study ultraviolet H I and metal-line transitions in the circumgalactic medium (CGM) of 15 massive, quenched luminous red galaxies (LRGs) at redshift z ~ 0.5 and with impact parameters up to 400 kpc. We selected eight LRG-CGM systems to study general properties of the CGM around LRGs, while the other seven are already known to contain cool CGM g…
The Isaac Newton Telescope Monitoring Survey of Local Group Dwarf Galaxies. VI. The Star Formation History and Dust Production in Andromeda IX
Abdollahi, Hedieh; Javadi, Atefeh; Mirtorabi, Mohammad Taghi +9 more
We present a photometric study of the resolved stellar populations in Andromeda IX (And IX), the closest satellite to M31, a metal-poor and low-mass dwarf spheroidal galaxy. We estimate a distance modulus of ${24.56}_{-0.15}^{+0.05}$ mag based on the tip of the red giant branch. By probing the variability of asymptotic giant branch stars, we study…
A possible dwarf galaxy satellite-of-satellite problem in ΛCDM
Müller, Oliver; Heesters, Nick; Jerjen, Helmut +2 more
Dark matter clusters on all scales, and it is therefore expected that even substructure should host its own substructure. Using the Extragalactic Distance Database, we searched for dwarf-galaxy satellites of dwarf galaxies, that is, satellite-of-satellite galaxies, corresponding to these substructures of substructure. From investigation of Hubble …
CO Excitation in High-z Main-sequence Analogues: Resolved CO(4-3)/CO(3-2) Line Ratios in DYNAMO Galaxies
Glazebrook, Karl; Lenkić, Laura; Bolatto, Alberto D. +6 more
The spectral line energy distribution of carbon monoxide contains information about the physical conditions of the star-forming molecular hydrogen gas; however, the relation to local radiation field properties is poorly constrained. Using ~1-2 kpc scale Atacama Large Millimeter Array observations of CO(3-2) and CO(4-3), we characterize the CO(4-3)…
Cold molecular gas outflow encasing the ionized one in the Seyfert galaxy NGC 3281
Storchi-Bergmann, Thaisa; Riffel, Rogemar A.; Morganti, Raffaella +2 more
We present ALMA CO (2-1) observations of the Seyfert 2 galaxy NGC 3281 at ~100 pc spatial resolution. This galaxy was previously known to present a bi-conical ionized gas outflow extending to 2 kpc from the nucleus. The analysis of the CO moment and channel maps, as well as kinematic modelling, reveals two main components in the molecular gas: one…
DMPP-4: candidate sub-Neptune mass planets orbiting a naked-eye star
Anglada-Escudé, G.; Fossati, L.; Llama, J. +9 more
We present radial velocity measurements of the very bright (V ~ 5.7) nearby F star, DMPP-4 (HD 184960). The anomalously low Ca II H&K emission suggests mass-loss from planets orbiting a low activity host star. Periodic radial velocity variability with ~10 m s-1 amplitude is found to persist over a >4 yr time-scale. Although the n…
Doppler confirmation of TESS planet candidate TOI-1408.01: grazing transit and likely eccentric orbit
Galazutdinov, G. A.; Korablev, O.; Yakunin, I. +16 more
We report an independent Doppler confirmation of the TESS planet candidate orbiting an F-type main-sequence star TOI-1408 located 140 pc away. We present a set of radial velocities obtained with a high-resolution fibre-optic spectrograph FFOREST mounted at the SAO RAS 6-m telescope (BTA-6). Our self-consistent analysis of these Doppler data and TE…
Solar Electron Beam Velocities That Grow Langmuir Waves in the Inner Heliosphere
Reid, Hamish A. S.; Lorfing, Camille Y.
Solar accelerated electron beams, a component of space weather, are emitted by eruptive events at the Sun. They interact with the ambient plasma to grow Langmuir waves, which subsequently produce radio emission, changing the electrons' motion through space. Solar electron beam-plasma interactions are simulated using a quasilinear approach to kinet…
Peculiarities of Open Star Clusters with High Vertical Velocities from the Region of the Sco-Cen OB Association
Bobylev, V. V.; Bajkova, A. T.
We have studied the kinematics of a unique sample of young open star clusters (OSCs) with high vertical velocities, $15<W<40$ km s${}^{-1}$. The characteristics of these clusters were taken from the catalogue by Hunt and Reffert (2023), where their mean proper motions, line-of-sight velocities, and distances were calculated using Gaia DR3 da…