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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…
VLBI detection of the AE Aqr twin, LAMOST J024048.51+195226.9
Zhang, Bo; Yang, Jun; An, Tao +8 more
LAMOST J024048.51+195226.9 (J0240+1952) was recently identified as the second AE Aquarii (AE Aqr)-type cataclysmic variable, possessing the fastest known rotating white dwarf. We performed a Very Long Baseline Interferometry (VLBI) observation of J0240+1952 utilizing the European VLBI Network at 1.7 GHz, to obtain the first view of the radio morph…
The distribution of the near-solar bound dust grains detected with Parker Solar Probe
Mann, I.; Kočiščák, S.; Theodorsen, A.
Context. Parker Solar Probe (PSP) counts dust impacts in the near-solar region, but modeling effort is needed to understand the dust population's properties. Aims. We aim to constrain the dust cloud's properties based on the flux observed by PSP. Methods. We developed a forward model for the bound dust detection rates using the formalism of 6D pha…
Cataclysmic variables and the disc instability model in the Gaia DR3 colour-magnitude diagram
Babusiaux, Carine; Dubus, Guillaume
Context. Cataclysmic variables (CVs) are semi-detached binaries composed of a white dwarf orbiting a lower-mass K or M star.
Aims: We investigate whether CVs are responsible for a new intriguing feature (the "hook") that appears in the Gaia DR3 colour-magnitude Hertzsprung-Russell diagram (HRD) when selecting sources with low extinction. We a…
Characterization of Blue and Yellow Straggler Stars of Berkeley 39
Panthi, Anju; Vaidya, Kaushar; Rao, Khushboo K. +1 more
We characterize blue straggler stars (BSSs) and yellow straggler stars (YSSs) of the open cluster (OC) Berkeley 39 using multiwavelength observations including the Swift/Ultraviolet and Optical Telescope (UVOT). Our analysis also makes use of ultraviolet (UV) data from Galaxy Evolution Explorer, optical data from Gaia DR3 and Panoramic Survey Tele…
Bimodal aerosol distribution in Venus' upper haze from joint SPICAV-UV and -IR observations on Venus Express
Montmessin, F.; Fedorova, A.; Korablev, O. +3 more
Spectroscopic solar occultation measurements by the Spectroscopy for Investigation of Characteristics of the Atmosphere of Venus/Solar Occultation at Infrared instrument (SPICAV/SOIR) onboard the Venus Express orbiter gave new data about upper haze aerosol properties, its vertical distribution and spatial and temporal variations. Early study with …
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…
Three-part structure of a solar coronal mass ejection observed in low coronal signatures of Solar Orbiter
Veronig, Astrid M.; Dumbović, Mateja; Dissauer, Karin +4 more
Context. Coronal mass ejections (CMEs) are large-scale eruptions of plasma and magnetic field from the Sun propagating through the heliosphere. Observations of the March 28, 2022, event provide unique images of a three-part solar CME in the low corona in active region 12975: a bright core or filament, a dark cavity, and a bright front edge. Aims. …
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-…