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NuSTAR Non-detection of a Faint Active Galactic Nucleus in an Ultraluminous Infrared Galaxy with Kpc-scale Fast Wind
Kawamuro, Taiki; Toba, Yoshiki; Noda, Hirofumi +4 more
Large-scale outflows are generally considered to be possible evidence that active galactic nuclei (AGNs) can severely affect their host galaxies. Recently, an ultraluminous infrared galaxy (ULIRG) at z = 0.49, AKARI J0916248+073034, was found to have a galaxy-scale [O III] λ5007 outflow with one of the highest energy-ejection rates at z < 1.6. …
Discovery of a Rare Late-type, Low-mass Wolf-Rayet Star in the LMC
Prochaska, J. Xavier; Morrell, Nidia; Bond, Howard E. +4 more
We report the serendipitous discovery of an object, UVQS J060819.93-715737.4, with a spectrum dominated by extremely intense, narrow C II emission lines. The spectrum is similar to those of the very rare, late-type [WC11] low-mass Wolf-Rayet stars. Despite the recognition of these stars as a distinct class decades ago, there remains barely a handf…
Ion acceleration at dipolarization fronts associated with the interchange instability in Earth's magnetotail
Lu, HaoYu; Ge, YaSong; Sun, Chao
A Multiwavelength Study of the Cool Core Cluster MACS J1447.4+0827
von der Linden, A.; Hlavacek-Larrondo, J.; Allen, S. W. +8 more
Clusters of galaxies are outstanding laboratories for understanding the physics of supermassive black hole (SMBH) feedback. Here we present the first Chandra, Karl G. Jansky Very Large Array, and Hubble Space Telescope analysis of MACS J1447.4+0827 (z = 0.3755), one of the strongest cool core clusters known, in which extreme feedback from its cent…
New insights on the massive interacting binary UU Cassiopeiae
Hadrava, P.; Jurkovic, M. I.; Mennickent, R. E. +7 more
We present the results of our study of the close binary UU Cassiopeiae based on previously published multiwavelength photometric and spectroscopic data. Based on eclipse timings from the last 117 years, we find an improved orbital period of Po = 8.d519296(8). In addition, we find a long cycle of length T ∼ 270 d in…
Sequential Lid Removal in a Triple-decker Chain of CME-producing Solar Eruptions
Joshi, Bhuwan; Joshi, Navin Chandra; Moore, Ronald L. +1 more
We investigate the onsets of three consecutive coronal mass ejection (CME) eruptions in 12 hr from a large bipolar active region (AR) observed by the Solar Dynamics Observatory (SDO), the Solar Terrestrial Relations Observatory (STEREO), the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI), and the Geostationary Operational Environmen…
Structural analysis of disc super star clusters of M82: size and profile shape at intermediate ages
Mayya, Y. D.; Rosa-González, D.; Puerari, I. +1 more
We present the structural parameters of 99 super star clusters (SSCs) in the disc of M82. Moffat-EFF, King, and Wilson models were fitted using a χ2-minimization method to background-subtracted surface brightness profiles in the F435W (B), F555W (V), and F814W (I) bands of the Advanced Camera for Surveys (ACS) of the Hubble Space Telesc…
Detecting neutral hydrogen at z ≳ 3 in large spectroscopic surveys of quasars
Fumagalli, Michele; Fotopoulou, Sotiria; Thomson, Laura
We present a pipeline based on a random forest classifier for the identification of high column density clouds of neutral hydrogen (i.e. the Lyman limit systems, LLSs) in absorption within large spectroscopic surveys of z ≳ 3 quasars. We test the performance of this method on mock quasar spectra that reproduce the expected data quality of the Dark…
Morphology and ionization characteristics of planetary nebulae PB 1 and PC 19
Mondal, Soumen; Das, Ramkrishna; Bandyopadhyay, Rahul +1 more
We present results of our study of two planetary nebulae (PNe), PB1 and PC 19. We use the optical spectra of these two PNe observed at 2 m Himalayan Chandra Telescope and also archival and literature data for the study. We use the morphokinematic code shape to construct 3D morphologies of the PNe and the photoionization code cloudy to model the ob…
Low-Frequency Radio Observations of the "Quiet" Corona During the Descending Phase of Sunspot Cycle 24
Ramesh, R.; Kumari, A.; Kathiravan, C. +3 more
We carried out a statistical study of the "quiet" solar corona during the descending phase of the Sunspot Cycle 24 (i.e., January 2015 to May 2019) using data obtained with the Gauribidanur RAdioheliograPH (GRAPH) at 53 and 80 MHz simultaneously. Our results show that the equatorial (east-west) diameters of the solar corona at the above two freque…