Search Publications
Ongoing and Fossil Large-scale Outflows Detected in a High-redshift Radio Galaxy: [C II] Observations of TN J0924-2201 at z = 5.174
Imanishi, Masatoshi; Kohno, Kotaro; Schramm, Malte +13 more
We present Atacama Large Millimeter/submillimeter Array observations of the [C II] 158 µm line and the underlying continuum emission of TN J0924‑2201, which is one of the most distant known radio galaxies at z > 5. The [C II] line and 1 mm continuum emission are detected at the host galaxy. The systemic redshift derived from the [C II] li…
A Hot Core in the Group-dominant Elliptical Galaxy NGC 777
Babul, Arif; David, Laurence P.; O'Sullivan, Ewan +8 more
NGC 777 provides an example of a phenomenon observed in some group-central ellipticals, in which the temperature profile shows a central peak, despite the short central cooling time of the intragroup medium. We use deep Chandra X-ray observations of the galaxy, supported by uGMRT 400 MHz radio imaging, to investigate the origin of this hot core. W…
Toward a Live Homogeneous Database of Solar Active Regions Based on SOHO/MDI and SDO/HMI Synoptic Magnetograms. II. Parameters for Solar Cycle Variability
Wang, Ruihui; Jiang, Jie; Luo, Yukun
Solar active regions (ARs) determine solar polar fields and cause solar cycle variability within the framework of the Babcock–Leighton dynamo. The contribution of an AR to the polar field is measured by its dipole field, which results from flux emergence and subsequent flux transport over the solar surface. The dipole fields contributed by an AR b…
Giant Biconical Dust Filaments in the Starburst Galaxy NGC 1808
Veilleux, Sylvain; Kane, Rohan
We present the results from an analysis of multiwavelength archival data on the multiphase outflow in the starburst galaxy NGC 1808. We report the detection at 70 and 100 µm of dust filaments that extend up to ∼13 kpc from the galactic midplane and trace an edge-brightened biconical structure along the minor axis of the galaxy. The inner fil…
Pressure Balance and Energy Budget of the Nuclear Superbubble of NGC 3079
Sun, Wei; Ji, Li; Li, Jiang-Tao +1 more
Superbubbles in the nuclear region of galaxies could be produced by active galactic nuclei (AGN) or nuclear starburst via different driving forces. We report analysis of the multiwavelength data of the kiloparsec-scale nuclear superbubble in NGC 3079 in order to probe the mechanisms driving the expansion of the superbubble. Based on the Chandra X-…
Solar Type J Radio Bursts and the Associated Coronal Loop
Feng, S. W.; Misawa, H.; Xie, H. X.
The solar type J radio burst is a variant of type III bursts, which are a probe for understanding solar energetic electrons and local electron density. This study investigates a type J burst event on 2017 September 9. We have combined the data from the extreme-ultraviolet (EUV) imaging and the EUV Imaging Spectrometer (EIS) to analyze the event. W…
Distribution and Properties of Molecular Gas toward the Monoceros OB1 Region
Wang, Hongchi; Zhang, Shiyu; Su, Yang +9 more
We perform a comprehensive CO study toward the Monoceros OB1 (Mon OB1) region based on the Milky Way Imaging Scroll Painting survey at an angular resolution of about 50″. The high-sensitivity data, together with the high dynamic range, show that molecular gas in the 8° × 4° region displays complicated hierarchical structures and various morphology…
Asphericity of the Base of the Solar Convection Zone
Basu, Sarbani; Korzennik, Sylvain G.
We have used solar oscillation frequencies and frequency splittings obtained over solar cycles 23 and 24 to investigate whether the base of the solar convection zone shows any departure from spherical symmetry. We used the even-order splitting coefficients, a 2–a 8, and estimated the contributions from each one separately. Th…
Exploring Neutral Hydrogen in Radio MOlecular Hydrogen Emission Galaxies (MOHEGs) and Prospects with the SKA
Sethuram, Ramya; Roy, Subhashis; Roy, Nirupam +6 more
Empirical studies of cold gas content are essential for comprehending the star formation activities and evolution in galaxies. However, it is not straightforward to understand these processes because they depend on various physical properties of the interstellar medium. Massive Faranoff–Riley I/II type radio galaxies rich in molecular hydrogen wit…
A Study on the Nested Rings CME Structure Observed by the WISPR Imager Onboard Parker Solar Probe
Stenborg, Guillermo; Hess, Phillip; Linton, Mark G. +5 more
Despite the significance of coronal mass ejections (CMEs) in space weather, a comprehensive understanding of their interior morphology remains a scientific challenge, particularly with the advent of many state-of-the-art solar missions such as Parker Solar Probe (Parker) and Solar Orbiter (SO). In this study, we present an analysis of a complex CM…