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Discovery of Two Polars from a Crossmatch of ZTF and the SRG/eFEDS X-Ray Catalog
Riddle, Reed; Szkody, Paula; Mróz, Przemek +14 more
Magnetic cataclysmic variables (CVs) are luminous Galactic X-ray sources, which have been difficult to find in purely optical surveys due to their lack of outburst behavior. The eROSITA telescope on board the Spektr-RG mission is conducting an all-sky X-ray survey and recently released the public eROSITA Final Equatorial Depth Survey (eFEDS) catal…
Late-time Hubble Space Telescope Observations of AT 2018cow. II. Evolution of a UV-bright Underlying Source 2-4 Yr Post-discovery
Kilpatrick, Charles D.; Drout, Maria R.; Foley, Ryan J. +4 more
In this second of a two-paper series, we present a detailed analysis of three Hubble Space Telescope observations taken ~2-4 yr post-discovery, examining the evolution of a UV-bright underlying source at the precise position of AT 2018cow. While observations at ~2-3 yr post-discovery revealed an exceptionally blue (L ν ∝ ν 1.99
Understanding the Early Stages of Galaxy Formation Using Very Metal-poor Stars from the Hamburg/ESO Survey
Carollo, Daniela; Christlieb, Norbert; Tissera, Patricia B. +1 more
We explore the chemodynamical properties of a sample of very metal-poor (VMP) stars selected from the Hamburg/ESO survey, matched with Gaia EDR3, in the phase space identified by the three integrals of motion (L z , E, I 3). Disk and halo orbits are separated by using the criteria defined in Carollo & Chiba. We found 26 …
ATOMIUM: Probing the inner wind of evolved O-rich stars with new, highly excited H2O and OH lines
Menten, K. M.; Kervella, P.; Müller, H. S. P. +17 more
Context. Water (H2O) and the hydroxyl radical (OH) are major constituents of the envelope of O-rich late-type stars. Transitions involving energy levels that are rotationally or vibrationally highly excited (energies ≳4000 K) have been observed in both H2O and OH. These and more recently discovered transitions can now be obse…
Beating Stellar Systematic Error Floors Using Transit-based Densities
Eastman, Jason D.; Diamond-Lowe, Hannah; Tayar, Jamie
It has long been understood that the light curve of a transiting planet constrains the density of its host star. That fact is routinely used to improve measurements of the stellar surface gravity and has been argued to be an independent check on the stellar mass. Here we show how the stellar density can also dramatically improve the precision of t…
Spectroscopic Analysis of Milky Way Outer Halo Satellites: Aquarius II and Boötes II
Li, Ting S.; Simon, Joshua D.; Pace, Andrew B. +3 more
In this paper, we present a chemical and kinematic analysis of two ultrafaint dwarf galaxies (UFDs), Aquarius II (Aqu II) and Boötes II (Boo II), using Magellan/IMACS spectroscopy. We present the largest sample of member stars for Boo II (12), and the largest sample of red giant branch members with metallicity measurements for Aqu II (eight). In b…
Numerical studies on the link between radioisotopic signatures on Earth and the formation of the Local Bubble. II. Advanced modelling of interstellar 26Al, 53Mn, 60Fe, and 244Pu influxes as traces of past supernova activity in the solar neighbourhood
Schulreich, M. M.; Feige, J.; Breitschwerdt, D.
Context. Measurements of long-lived radioisotopes, which have grown rapidly in quantity and sensitivity over the last few years, provide a means, completely independent of other observational channels, to draw conclusions about near-Earth supernovae (SNe) and thus the origin of the Local Bubble (LB), our Galactic habitat. First and foremost in thi…
Stellar associations powering H II regions - I. Defining an evolutionary sequence
Kruijssen, J. M. Diederik; Leroy, Adam K.; Rosolowsky, Erik +30 more
Connecting the gas in H II regions to the underlying source of the ionizing radiation can help us constrain the physical processes of stellar feedback and how H II regions evolve over time. With PHANGS-MUSE, we detect nearly 24 000 H II regions across 19 galaxies and measure the physical properties of the ionized gas (e.g. metallicity, ionization …
The late time optical evolution of twelve core-collapse supernovae: detection of normal stellar winds
Kochanek, C. S.; Neustadt, J. M. M.; Rizzo Smith, M.
We analyse the late time evolution of 12 supernovae (SNe) occurring over the last ~41 yr, including nine Type IIP/L, two IIb, and one Ib/c, using UBVR optical data from the Large Binocular Telescope (LBT) and difference imaging. We see late time (5-42 yr) emission from nine of the eleven Type II SNe (eight Type IIP/L, one IIb). We consider radioac…
UV and Hα HST Observations of Six GASP Jellyfish Galaxies
Scarlata, Claudia; Mingozzi, Matilde; Calzetti, Daniela +17 more
Star-forming, Hα-emitting clumps are found embedded in the gaseous tails of galaxies undergoing intense ram pressure stripping in galaxy clusters, so-called jellyfish galaxies. These clumps offer a unique opportunity to study star formation under extreme conditions, in the absence of an underlying disk and embedded within the hot intracluster medi…