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Hard X-ray emission from blazars associated with high-energy neutrinos
Lutovinov, A. A.; Starobinsky, A. A.; Burenin, R. A. +4 more
Bright blazars were found to be prominent neutrino sources, and a number of IceCube events were associated with them. Evaluating high-energy photon emission of such blazars is crucial for better understanding of the processes and regions where neutrinos are produced. Here, we focus on hard X-ray emission observed by the SRG/ART-XC telescope, by th…
Photometric binaries in 14 Magellanic Cloud star clusters
Milone, Antonino P.; Lagioia, Edoardo P.; Marino, Anna F. +7 more
Binary stars play a major role in determining the dynamic evolution of star clusters. We used images collected with the Hubble Space Telescope to study fourteen star clusters of the Magellanic Clouds that span an age interval between ∼0.6 and 2.1 Gyr and masses of 104 − 105 M⊙. We estimated the fraction of binary s…
The AstroSat UV deep field north: direct determination of the UV luminosity function and its evolution from z 0.8-0.4
Saha, Kanak; Mondal, Chayan; Bhattacharya, Souradeep
We characterize the evolution of the rest-frame 1500 Å UV luminosity function (UVLF) from AstroSat/UVIT F154W and N242W imaging in the Great Observatories Origins Survey North (GOODS-N) field. With deep FUV observations, we construct the UVLF for galaxies at z$\lt 0.13$ and subsequently characterize it with a Schechter function fit. The fitted par…
A Survey of Protoplanetary Disks Using the Keck/NIRC2 Vortex Coronagraph
Ren, Bin B.; Knutson, Heather A.; Uyama, Taichi +34 more
Recent Atacama Large Millimeter/submillimeter Array (ALMA) observations of protoplanetary disks in the millimeter continuum have shown a variety of radial gaps, cavities, and spiral features. These substructures may be signposts for ongoing planet formation, and therefore these systems are promising targets for direct imaging planet searches in th…
A 350 MHz Green Bank Telescope Survey of Unassociated Fermi LAT Sources: Discovery and Timing of 10 Millisecond Pulsars
Camilo, F.; Guillemot, L.; Johnson, T. J. +18 more
We have searched for radio pulsations toward 49 Fermi Large Area Telescope (LAT) 1FGL Catalog γ-ray sources using the Green Bank Telescope at 350 MHz. We detected 18 millisecond pulsars (MSPs) in blind searches of the data; 10 of these were discoveries unique to our survey. 16 are binaries, with eight having short orbital periods P B …
Isochrone fitting of the open cluster M67 in the era of Gaia and improved model physics
Stello, Dennis; Hon, Marc; Pinsonneault, Marc H. +3 more
The Gaia mission has provided highly accurate observations that have significantly reduced the scatter in the colour-magnitude diagrams of open clusters. As a result of the improved isochrone sequence of the open cluster M67, we have created new stellar models that avoid commonly used simplifications in 1D stellar modelling, such as mass-independe…
A search for high-redshift direct-collapse black hole candidates in the PEARLS north ecliptic pole field
Finkelstein, Steven L.; Grogin, Norman A.; Koekemoer, Anton M. +33 more
Direct-collapse black holes (DCBHs) of mass ∼104 − 105 M⊙ that form in HI-cooling halos in the early Universe are promising progenitors of the ≳109 M⊙ supermassive black holes that fuel observed z ≳ 7 quasars. Efficient accretion of the surrounding gas onto such DCBH seeds may render them suff…
Black Hole Mass and Eddington Ratio Distribution of Hot Dust-obscured Galaxies
Tsai, Chao-Wei; Jun, Hyunsung D.; Eisenhardt, Peter R. M. +8 more
Hot dust-obscured galaxies (Hot DOGs) are a rare population of hyperluminous infrared galaxies discovered by the Wide-field Infrared Survey Explorer mission. Despite the significant obscuration of the active galactic nucleus (AGN) by dust in these systems, pronounced broad and blueshifted emission lines are often observed. Previous work has shown …
A Buddy for Betelgeuse: Binarity as the Origin of the Long Secondary Period in α Orionis
Joyce, Meridith; Molnár, László; Goldberg, Jared A.
We predict the existence of α Ori B, a low-mass companion orbiting Betelgeuse. This is motivated by the presence of a 2170 day long secondary period (LSP) in Betelgeuse's lightcurve, a periodicity that is ≈5 times longer than the star's 416 day fundamental radial pulsation mode. While binarity is currently the leading hypothesis for LSPs in genera…
The Cause of the Difference in the Propagation Distances between Compact and Transient Jets in Black Hole X-Ray Binaries
Zdziarski, Andrzej A.; Heinz, Sebastian
Accreting black hole binaries change their properties during evolution, passing through two main luminous states, dominated by either hard or soft X-rays. In the hard state, steady compact jets emitting multiwavelength radiation are present. Those jets are usually observed in radio, and when resolved, their extent is ≲1015 cm. Then, dur…