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Observation of a Fully-formed Forward–Reverse Shock Pair due to the Interaction between Two Coronal Mass Ejections at 0.5 au
Lugaz, Noé; Wimmer-Schweingruber, Robert F.; Dresing, Nina +17 more
We report direct observations of a fast magnetosonic forward–reverse shock pair observed by Solar Orbiter on 2022 March 8 at the short heliocentric distance of 0.5 au. The structure, sharing some features with fully-formed stream interaction regions, is due to the interaction between two successive coronal mass ejections (CMEs), never previously o…
The First Combined Hα and Rest-UV Spectroscopic Probe of Galactic Outflows at High Redshift
Tacconi, L. J.; Shapley, Alice E.; Reddy, Naveen A. +6 more
We investigate the multiphase structure of gas flows in galaxies. We study 80 galaxies during the epoch of peak star formation (1.4 ≤ z ≤ 2.7) using data from the Keck/Low-Resolution Imaging Spectrometer (LRIS) and the Very Large Telescope/K-Band Multi-Object Spectrograph (KMOS). Our analysis provides a simultaneous probe of outflows using UV emis…
Exploring the hardness of the ionising radiation with the infrared softness diagram. I. Similar effective temperature scales for starbursts and (ultra)luminous infrared galaxies
Amorín, R.; Pérez-Montero, E.; Vílchez, J. M. +3 more
Aims: We explored the softness parameter in the infrared, ηIR', whose main purpose is the characterisation of the hardness of the incident ionising radiation in emission-line nebulae. This parameter is obtained from the combination of mid-infrared wavelength range transitions corresponding to consecutive ionisation stage…
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 …