Search Publications
Evidence of Continuous Reconnection along a Helmet Streamer Current Sheet Observed by WISPR on Parker Solar Probe
Vourlidas, Angelos; Qiu, Jiong; Stenborg, Guillermo +5 more
Parker Solar Probe's second solar encounter from 2019 March 30 to April 11 occurred during a period when the corona had a simple magnetic structure and relatively flat heliospheric current sheet (HCS), which was in the field of view of the Wide-field Imager for Solar Probe (WISPR) throughout. The images show an almost continual flow of transient d…
The Truncated Circumgalactic Medium of the Large Magellanic Cloud
Fox, Andrew J.; Lehner, Nicolas; Tumlinson, Jason +6 more
The Large Magellanic Cloud (LMC) is the nearest massive galaxy to the Milky Way (MW). Its circumgalactic medium (CGM) is complex and multiphase, containing both stripped H I structures like the Magellanic Stream and Bridge and a diffuse warm corona seen in high-ion absorption. We analyze 28 active galactic nucleus sight lines passing within 35 kpc…
PICZL: Image-based photometric redshifts for AGN
Shirley, R.; Bauer, F. E.; Salvato, M. +14 more
Context. Computing reliable photometric redshifts (photo-z) for active galactic nuclei (AGN) is a challenging task, primarily due to the complex interplay between the unresolved relative emissions associated with the supermassive black hole and its host galaxy. Spectral energy distribution (SED) fitting methods, while effective for galaxies and AG…
Dissecting the morphology of star forming complex S193
Ojha, D. K.; Pandey, Rakesh; Sharma, Saurabh +6 more
We have studied a star-forming complex S193 using near-infrared (NIR) observations and other archival data covering optical to radio wavelengths. We identified stellar clusters in the complex using the NIR photometric data and estimated the membership and distance of the clusters. Using the mid-infrared (MIR) and far-infrared (FIR) images, the dis…
Active Galactic Nucleus Properties of ∼1 Million Member Galaxies of Galaxy Groups and Clusters at z < 1.4 Based on the Subaru Hyper Suprime-Cam Survey
Goto, Tomotsugu; Imanishi, Masatoshi; Schramm, Malte +17 more
Herein, we present the statistical properties of active galactic nuclei (AGNs) for approximately 1 million member galaxies of galaxy groups and clusters with 0.1 < cluster redshift (z cl) < 1.4 selected using the Subaru Hyper Suprime-Cam, the so-called CAMIRA clusters. In this research, we focused on the AGN power fraction (f
Cold diffuse interstellar medium of Magellanic Clouds: II. Physical conditions from excitation of C I and H2
Balashev, S. A.; Klimenko, V. V.; Kosenko, D. N.
We present a comprehensive study of the excitation of C I fine-structure levels along 57 sight lines in the Large and Small Magellanic Clouds (LMC and SMC). The sightlines were selected by the detection of H2 in FUSE spectra. Using archival HST/COS and HST/STIS spectra, we detected absorption of C I fine-structure levels and measured th…
On the Properties of X-Ray Corona in Seyfert 1 Galaxies
Stalin, C. S.; Ricci, Claudio; Marchesi, S. +4 more
We carried out a uniform and systematic analysis of a sample of 112 nearby bright Seyfert 1 type active galactic nuclei, the observations of which were carried out by the Nuclear Spectroscopic Telescope Array between 2013 August and 2022 May. The main goal of this analysis is to investigate the nature of the X-ray corona in Seyfert 1 galaxies. By …
"Forbidden" stars in the eROSITA all-sky survey: X-ray emission from very late-type giants
Schmitt, J. H. M. M.; Czesla, S.; Robrade, J. +4 more
We present the results of the first X-ray all-sky survey (eRASS1) performed by the eROSITA instrument aboard the Spectrum-Roentgen-Gamma (SRG) mission on X-ray emitting red giants and supergiants. Focusing on stars positioned at high galactic latitudes above 20°, we constructed a complete sample of such objects using the Gaia DR3 catalog and ident…
The XUV-driven escape of the planets around TOI-431 and ν2 Lupi
Fernández Fernández, Jorge; Wheatley, Peter J.; Osborn, Ares +4 more
One of the leading mechanisms invoked to explain the existence of the radius valley is atmospheric mass-loss driven by X-ray and extreme-ultraviolet irradiation, with this process stripping the primordial envelopes of young, small planets to produce the observed bimodal distribution. We present an investigation into the TOI-431 and ν2 L…
Cliff collapse on Comet 67P/Churyumov-Gerasimenko - II. Imhotep and Hathor
Davidsson, Björn J. R.
Cliff collapses on Comet 67P/Churyumov-Gerasimenko expose relatively pristine nucleus matter and offer rare opportunities to characterize ice-rich comet material. Here, Microwave Instrument for Rosetta Orbiter (MIRO) observations of two collapsed or crumbling cliffs in the Imhotep and Hathor regions have been assembled. The empirical diurnal anten…