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HI-H2 transition: Exploring the role of the magnetic field. A case study toward the Ursa Major cirrus
Blinov, D.; Panopoulou, G. V.; Gong, Y. +6 more
Context. Atomic gas in the diffuse interstellar medium (ISM) is organized in filamentary structures. These structures usually host cold and dense molecular clumps. The Galactic magnetic field is considered to play an important role in the formation of these clumps.
Aims: Our goal is to explore the role of the magnetic field in the HI
Light-curve Evolution of the Nearest Tidal Disruption Event: A Late-time, Radio-only Flare
Yuan, Qiang; Perlman, Eric S.; Meyer, Eileen T. +7 more
Tidal disruption events (TDEs) occur when a star passes close enough to a galaxy's supermassive black hole to be disrupted by tidal forces. We discuss new observations of IGRJ12580+0134, a TDE observed in NGC 4845 (d = 17 Mpc) in 2010 November, with the Karl G. Jansky Very Large Array (VLA 9 9 The National Radio Astronomy Obs…
Galactic Cosmic Rays Throughout the Heliosphere and in the Very Local Interstellar Medium
Heber, Bernd; Zhang, Ming; Potgieter, Marius S. +7 more
We review recent observations and modeling developments on the subject of galactic cosmic rays through the heliosphere and in the Very Local Interstellar Medium, emphasizing knowledge that has accumulated over the past decade. We begin by highlighting key measurements of cosmic-ray spectra by Voyager, PAMELA, and AMS and discuss advances in global…
The Unmixed Debris of Gaia-Sausage/Enceladus in the Form of a Pair of Halo Stellar Overdensities
Chiappini, Cristina; Limberg, Guilherme; Rossi, Silvia +5 more
In the first billion years after its formation, the Galaxy underwent several mergers with dwarf satellites of various masses. The debris of Gaia-Sausage/Enceladus (GSE), the galaxy responsible for the last significant merger of the Milky Way, dominates the inner halo and has been suggested to be the progenitor of both the Hercules-Aquila Cloud (HA…
A new method for finding nearby white dwarfs exoplanets and detecting biosignatures
Vanderburg, Andrew; Lustig-Yaeger, Jacob; Stevenson, Kevin B. +5 more
We demonstrate that the James Webb Space Telescope (JWST) can detect infrared (IR) excess from the blended light spectral energy distribution of spatially unresolved terrestrial exoplanets orbiting nearby white dwarfs. We find that JWST is capable of detecting warm (habitable-zone; Teq = 287 K) Earths or super-Earths and hot (400-1000 K…
XXL-HSC: Link between AGN activity and star formation in the early Universe (z ⩾ 3.5)
Paltani, S.; Pierre, M.; Vignali, C. +11 more
In this work, our aim is to investigate the star formation rate (SFR) of the host galaxies of active galactic nuclei (AGNs) in the early Universe. To this end, we constructed a sample of 149 luminous (L2 − 10 keV > 1044 erg s−1) X-ray AGNs at z ≥ 3.5 selected in three fields with different depths and observed ar…
Discovery of Three Candidate Magnetar-powered Fast X-Ray Transients from Chandra Archival Data
Berger, Edo; Lin, Dacheng; Irwin, Jimmy A. +1 more
It was proposed that a remnant stable magnetar could be formed in a binary neutron-star merger, leading to a fast X-ray transient (FXT) that can last for thousands of seconds. Recently, Xue et al. suggested that CDF-S XT2 was exactly such a kind of source. If confirmed, such emission can be used to search for electromagnetic counterparts to gravit…
The Kiloparsec-scale Neutral Atomic Carbon Outflow in the Nearby Type 2 Seyfert Galaxy NGC 1068: Evidence for Negative AGN Feedback
Tamura, Yoichi; Kohno, Kotaro; Schinnerer, Eva +13 more
Active galactic nucleus (AGN) feedback is postulated as a key mechanism for regulating star formation within galaxies. Studying the physical properties of the outflowing gas from AGNs is thus crucial for understanding the coevolution of galaxies and supermassive black holes. Here we report 55 pc resolution ALMA neutral atomic carbon [C I] 3
Geometry and Segmentation of Cerberus Fossae, Mars: Implications for Marsquake Properties
Rodriguez, S.; Hauber, E.; Lognonné, P. +9 more
The NASA InSight mission to Mars successfully landed on 26 November 2018 in Elysium Planitia. It aims to characterize the seismic activity and aid in the understanding of the internal structure of Mars. We focus on the Cerberus Fossae region, a giant fracture network ∼1,200 km long situated east of the InSight landing site where M ∼3 marsquakes we…
The impact of a massive Sagittarius dSph on GD-1-like streams
Price-Whelan, Adrian M.; Belokurov, Vasily; Evans, N. Wyn +1 more
We investigate the effects of a massive ($\gtrsim 4\times 10^{10}\, \mathrm{M}_\odot$) Sagittarius dwarf spheroidal galaxy (Sgr) on stellar streams using test particle simulations in a realistic Milky Way potential. We find that Sgr can easily disrupt streams formed more than ~3 Gyr ago, while stars stripped more recently are generally unaffected.…