Search Publications
Exploring the Emission Mechanisms of Mrk 180 with Long-term X-Ray and γ-Ray Data
Gupta, Nayantara; Mondal, Sandeep Kumar; Das, Saikat
Markarian (Mrk) 180 is a BL Lacertae object located at a redshift of 0.045 and is a potential candidate for high-energy cosmic-ray acceleration. We have analyzed the Fermi Large Area Telescope (Fermi-LAT) γ-ray data of Mrk 180 collected over a period of 12.8 yr and found no significant enhancement in the flux from the long-term γ-ray light curve. …
Supernovae Origin for the Low-latitude Intermediate-velocity Arch and the North Celestial Pole Loop
Jorissen, A.; Verschuur, G. L.; Schmelz, J. T. +1 more
Supernova explosions attributed to the unseen companion in several binary systems identified by the Third Gaia Data Release (Gaia DR3) may be responsible for a number of well-known and well-studied features in the radio sky, including the low-latitude intermediate-velocity (LLIV) arch and the north celestial pole (NCP) loop. Slices from the longit…
Investigation of Stellar Kinematics and Ionized Gas Outflows in Local (U)LIRGs
Kilerci, Ece; Wang, Shu; Zou, Fan +4 more
We explore the properties of stellar kinematics and ionized gas in a sample of 1106 local (U)LIRGs from the AKARI telescope. We combine data from Wide-field Infrared Survey Explorer and Sloan Digital Sky Survey Data Release 13 to fit the spectral energy distribution (SED) of each source to constrain the contribution of active galactic nuclei (AGNs…
Imaging Preflare Broadband Pulsations in the Decimetric-metric Wavelengths
Chen, Yao; Tan, Baolin; Zheng, Ruisheng +4 more
Preflare activities contain critical information about the precursors and causes of solar eruptions. Here we investigate the characteristics and origin of a group of broadband pulsations (BBPs) in the decimetric-metric wavelengths that took place during the preflare stage of the M7.1 flare on 2011 September 24. The event was recorded by multiple s…
Constraining X-Ray Variability of the Blazar 3C 273 Using XMM-Newton Observations over Two Decades
Mohorian, Maksym; Bhatta, Gopal; Adhikari, Tek P. +5 more
Blazars exhibit relentless variability across diverse spatial and temporal frequencies. The study of long- and short-term variability properties observed in the X-ray band provides insights into the inner workings of the central engine. In this work, we present timing and spectral analyses of the blazar 3C 273 using the X-ray observations from the…
Centaurus A: Exploring the Nature of the Hard X-Ray/Soft Gamma-Ray Emission with INTEGRAL
Jourdain, E.; Roques, J. P.; Molina, M. +1 more
The question of the origin of the hard X-ray/soft gamma-ray emission in Centaurus A (Cen A) persists despite decades of observations. Results from X-ray instruments suggest a jet origin since the implied electron temperature (kT e ) would cause runaway pair production in the corona. In contrast, instruments sensitive to soft gamma rays…
ALMA Observations of the Extraordinary Carina Pillars: A Complementary Sample
Reiter, Megan; Zapata, Luis A.; Takahashi, Satoko +3 more
We present a study of six dusty and gaseous pillars (containing the Herbig-Haro (HH) objects HH 1004 and HH 1010) and globules (that contain the HH 666, HH 900, HH 1006, and HH 1066 objects) localized in the Carina Nebula using sensitive and high-angular-resolution (~0.″3) Atacama Large Millimeter/submillimeter Array observations. This is a more e…
Radiatively Driven Clumpy X-Ray Absorbers in the NLS1 Galaxy IRAS 13224-3809
Ebisawa, Ken; Mizumoto, Misaki; Midooka, Takuya
Recent radiation-magnetohydrodynamic simulations of active galactic nuclei predict the presence of the disk winds, which may become unstable and turn into fragmented clumps far from the central black hole. These inner winds and the outer clumps may be observed as ultrafast outflows (UFOs) and partial absorbers, respectively. However, it is challen…
Analysis of Solar-like X-class Flare on Wolf 359 Observed Simultaneously with TESS and XMM-Newton
Siarkowski, M.; Falewicz, R.; Bicz, K. +3 more
We present an analysis of a flare on the Wolf 359 star based on simultaneous observations of Transiting Exoplanet Survey Satellite and XMM-Newton. A stellar flare with energy comparable to an X-class solar flare is analyzed on this star for the first time. The main goal of the study was to determine whether the same physical processes drive and oc…
Rotation of a Stealth CME on 2012 October 5 Observed in the Inner Heliosphere
Gopalswamy, Nat; Yashiro, Seiji; Srivastava, Nandita +3 more
Coronal mass ejections (CMEs) are subject to changes in their direction of propagation, tilt, and other properties. This is because CMEs interact with the ambient solar wind and other large-scale magnetic field structures. In this work, we report on the observations of the 2012 October 5 stealth CME using coronagraphic and heliospheric images. We …