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Hot Dust-obscured Galaxies with Excess Blue Light
Stern, D.; Bauer, F. E.; Díaz-Santos, T. +10 more
Hot dust-obscured galaxies (Hot DOGs) are among the most luminous galaxies in the universe. Powered by highly obscured, possibly Compton-thick, active galactic nuclei (AGNs), Hot DOGs are characterized by spectral energy distributions that are very red in the mid-infrared yet dominated by the host galaxy stellar emission in the UV and optical. An …
Very Long Baseline Astrometry of PSR J1012+5307 and its Implications on Alternative Theories of Gravity
Deller, Adam T.; Kaplan, David L.; Lazio, T. Joseph W. +4 more
PSR J1012+5307, a millisecond pulsar in orbit with a helium white dwarf (WD), has been timed with high precision for about 25 yr. One of the main objectives of this long-term timing is to use the large asymmetry in gravitational binding energy between the neutron star and the WD to test gravitational theories. Such tests, however, will be eventual…
X-shooter Spectroscopy and HST Imaging of 15 Massive Quiescent Galaxies at z ≳ 2
Conselice, Christopher J.; Gallazzi, Anna; Zibetti, Stefano +23 more
We present a detailed analysis of a large sample of spectroscopically confirmed massive quiescent galaxies (MQGs; log(M */M ⊙) ∼ 11.5) at z ≳ 2. This sample comprises 15 galaxies selected in the COSMOS and UDS fields by their bright K-band magnitudes and followed up with Very Large Telescope (VLT) X-shooter spectroscopy and H…
Introducing the Search for Intermediate-mass Black Holes in Nearby Galaxies (SIBLING) Survey
Plotkin, Richard M.; Martínez-Palomera, Jorge; Lira, Paulina +2 more
Intermediate-mass black holes (IMBHs) have masses between 102 and 106 M⊙ and are key to our understanding of the formation of massive black holes. The known population of IMBHs remains small, with a few hundred candidates and only a handful of them confirmed as bona fide IMBHs. Until now, the most widely used selec…
Revisiting the Impact of Dust Production from Carbon-rich Wolf-Rayet Binaries
Sakon, Itsuki; Williams, Peredur M.; Lau, Ryan M. +3 more
We present a dust spectral energy distribution (SED) and binary stellar population analysis revisiting the dust production rates (DPRs) in the winds of carbon-rich Wolf-Rayet (WC) binaries and their impact on galactic dust budgets. DustEM SED models of 19 Galactic WC "dustars" reveal DPRs of ${\dot{M}}_{d}\sim {10}^{-10}\mbox{--}{10}^{-6}$ M⊙…
Discovery of Two Pulsating Extremely Low-mass Pre-white Dwarf Candidates in the TESS Eclipsing Binaries
Zhang, Xiaobin; Wang, Kun; Dai, Min
We report the discovery of two new pulsating extremely low-mass pre-white dwarf (pre-ELMV) candidates in the Transiting Exoplanet Survey Satellite (TESS) eclipsing binaries, TIC 149160359 and TIC 416264037. Their light curves show a typical feature of EL CVn-type binaries. The light-curve modeling indicates that they are both detached systems with…
Cosmological Insights into the Early Accretion of r-process-enhanced Stars. I. A Comprehensive Chemodynamical Analysis of LAMOST J1109+0754
Zhao, Gang; Beers, Timothy C.; Placco, Vinicius M. +11 more
This study presents a comprehensive chemodynamical analysis of LAMOST J1109+0754, a bright (V = 12.8), extremely metal-poor ([Fe/H] = -3.17) star, with a strong r-process enhancement ([Eu/Fe] = +0.94 ± 0.12). Our results are based on the 7D measurements supplied by Gaia and the chemical composition derived from a high-resolution (R ∼ 110,000), hig…
The Luminosity Function of Red Supergiants in M31
Drout, Maria R.; Massey, Philip; Levesque, Emily M. +5 more
The mass-loss rates of red supergiant stars (RSGs) are poorly constrained by direct measurements, and yet the subsequent evolution of these stars depends critically on how much mass is lost during the RSG phase. In 2012 the Geneva evolutionary group updated their mass-loss prescription for RSGs with the result that a 20 M⊙ star now lose…
Narrowband Large Amplitude Whistler-mode Waves in the Solar Wind and Their Association with Electrons: STEREO Waveform Capture Observations
Breneman, A. W.; Cattell, C. A.; Short, B. +1 more
Large amplitude (up to 70 mV m-1) whistler-mode waves at frequencies of ∼0.2-0.4 fce (electron cyclotron frequency) are frequently observed in the solar wind. The waves are obliquely propagating at angles close to the resonance cone, resulting in significant electric fields parallel to the background magnetic field, enabling …
Supernovae in Orion: The Missing Link in the Star-forming History of the Region
Kounkel, Marina
The Orion Complex is a notable star-forming region fragmented into several different populations with substantial differences in their phase space. I propose a model that attempts to explain the how the Complex has evolved into this current configuration. In the model presented here, the large-scale expansion can be attributable to a supernova tha…