Search Publications
X-Ray and Radio Bursts from the Magnetar 1E 1547.0-5408
Tiengo, A.; Stella, L.; Rea, N. +10 more
We report on simultaneous radio and X-ray observations of the radio-emitting magnetar 1E 1547.0-5408 on 2009 January 25 and February 3, with the 64 m Parkes radio telescope and the Chandra and XMM-Newton X-ray observatories. The magnetar was observed in a period of intense X-ray bursting activity and enhanced X-ray emission. We report here on the …
V899 Mon: A Peculiar Eruptive Young Star Close to the End of Its Outburst
Pál, András; Ogłoza, Waldemar; Lee, Jeong-Eun +15 more
The eruptive young star V899 Mon shows characteristics of both FUors and EXors. It reached a peak brightness in 2010, then briefly faded in 2011, followed by a second outburst. We conducted multifilter optical photometric monitoring, as well as optical and near-infrared spectroscopic observations, of V899 Mon. The light curves and color-magnitude …
Spatial Variation in Strong Line Ratios and Physical Conditions in Two Strongly Lensed Galaxies at z 1.4
Momcheva, Ivelina; Brammer, Gabriel; Acharyya, Ayan +14 more
Upcoming space-based integral field spectrographs will enable spatially resolved spectroscopy of distant galaxies, including at the scale of individual star-forming regions (i.e., down to just tens of parsecs) in galaxies that have been strongly gravitationally lensed. In the meantime, there is only a very small set of lensed galaxies where such s…
TRAO Survey of the Nearby Filamentary Molecular Clouds, the Universal Nursery of Stars (TRAO FUNS). II. Filaments and Dense Cores in IC 5146
Caselli, Paola; Kwon, Woojin; Soam, Archana +13 more
We present the results on the physical properties of filaments and dense cores in IC 5146, as a part of the TRAO FUNS project. We carried out on-the-fly mapping observations using the Taeduk Radio Astronomy Observatory (TRAO) 14 m telescope covering about 1 square degree of the area of IC 5146 using various molecular lines. We identified 14 filame…
Observational Evidence for Enhanced Black Hole Accretion in Giant Elliptical Galaxies
McNamara, Brian R.; Hickox, Ryan C.; Kara, Erin +5 more
We present a study of the relationship between black hole accretion rate (BHAR) and star formation rate (SFR) in a sample of giant elliptical galaxies. These galaxies, which live at the centers of galaxy groups and clusters, have star formation and black hole activity that is primarily fueled by gas condensing out of the hot intracluster medium. F…
A Broadband View on Microquasar MAXI J1820+070 during the 2018 Outburst
Tramacere, A.; Fiocchi, M.; Ubertini, P. +5 more
The microquasar MAXI J1820+070 went into outburst from 2018 mid-March until mid-July, with several faint rebrightenings afterward. With a peak flux of approximately 4 Crab in the 20-50 keV energy range, the source was monitored across the electromagnetic spectrum with detections from radio to hard X-ray frequencies. Using these multiwavelength obs…
TOI-942b: A Prograde Neptune in a 60 Myr Old Multi-transiting System
Latham, David W.; Quinn, Samuel N.; Zhou, George +8 more
Mapping the orbital obliquity distribution of young planets is one avenue toward understanding mechanisms that sculpt the architectures of planetary systems. TOI-942 is a young field star, with an age of ~60 Myr, hosting a planetary system consisting of two transiting Neptune-sized planets in 4.3 and 10.1 day period orbits. We observed the spectro…
Discovery of a Highly Neutronized Ejecta Clump in the Type Ia Supernova Remnant 3C 397
Petre, Robert; Sato, Toshiki; Yamaguchi, Hiroya +7 more
The supernova remnant (SNR) 3C 397 is thought to originate from a Type Ia supernova (SN Ia) explosion of a near-Chandrasekhar-mass (MCh) progenitor, based on the enhanced abundances of Mn and Ni revealed by previous X-ray study with Suzaku. Here we report follow-up XMM-Newton observations of this SNR, conducted with the aim of investiga…
A New Reconstruction of the Sun's Magnetic Field and Total Irradiance since 1700
Wang, Y. -M.; Lean, J. L.
We model the Sun's large-scale magnetic field and total solar irradiance (TSI) since 1700 by combining flux transport simulations with empirical relationships between facular brightening, sunspot darkening, and the total photospheric flux. The photospheric field is evolved subject to the constraints that (1) the flux emergence rate scales as the y…
Discovery of the 5 keV Cyclotron Line Followed by Three Harmonics in Swift J1626.6-5156
Tsygankov, S.; Santangelo, A.; Lutovinov, A. +4 more
We report on observations of the Be/X-ray binary system Swift J1626.6-5156 performed with the Nuclear Spectroscopic Telescope ARray (NuSTAR) during a short outburst in 2021 March, following its detection by the MAXI monitor and Spektrum-Roentgen-Gamma (SRG) observatory. Our analysis of the broadband X-ray spectrum of the source confirms the presen…