Search Publications
Sensitivity of the Helioglow to Variation of the Total Ionization Rate and Solar Lyα Emission
Bzowski, M.; Kubiak, M. A.; Kowalska-Leszczynska, I. +1 more
Direct observations of solar wind are mostly limited to the vicinity of the ecliptic plane. Retrieving the latitudinal structure of solar wind indirectly based on observations of the backscatter glow of interstellar neutral hydrogen is complex and requires support from theoretical models. The GLOWS instrument, to operate on the planned IMAP missio…
Evaluation of the astrometric capability of Multi-Channel Imager and simulated calculation of proper motion of M31
Peng, Xiyan; Liao, Shilong; Qi, Zhaoxiang +8 more
Introduction: The Multi-Channel Imager (MCI), one of the back-end modules of the future China Space Station Telescope (CSST), is designed for high-precision spacebased astronomical observations. This paper evaluates the astrometric capability of the MCI based on simulated observational images and Gaia data: the M31 galaxy is selected as a represen…
Ionized X-ray winds in the radio galaxy Mrk 6
Fukazawa, Yasushi; Mao, Junjie; Kayanoki, Taishu
Active galactic nucleus (AGN) outflows including jets and ionized winds have been key phenomena such as jet collimation and AGN feedback to the host galaxy in astrophysics. Radio galaxies, a type of AGN with misaligned jets, have provided valuable insights into the properties and relationships of these outflows. However, several aspects regarding …
Ring nebulae around Wolf-Rayet stars in M33 as seen by SITELLE
Drissen, Laurent; Robert, Carmelle; Rousseau-Nepton, Laurie +5 more
We have conducted an analysis of nebulae around Wolf-Rayet (WR) stars in M33 using data collected by the imaging Fourier transform spectrometer SITELLE at the Canada-France-Hawaii telescope as part of the SIGNALS Large Program. Of the 211 known WR stars in M33, 178 are located in the fields observed in this study. We present the results of this an…
Tracking an Eruptive Prominence Using Multiwavelength and Multiview Observations on 2023 March 7
Song, Yongliang; Huang, Zhenghua; Zhang, Qingmin +2 more
In this paper, we carry out multiwavelength and multiview observations of the prominence eruption, which generated a C2.3 class flare and a coronal mass ejection (CME) on 2023 March 7. For the first time, we apply the revised cone model to three-dimensional reconstruction and tracking of the eruptive prominence for ∼4 hr. The prominence propagates…
Novel constraints on companions to the Helix nebula central star
Lothringer, Joshua D.; Parsons, Steven G.; Rauch, Thomas +3 more
The Helix is a visually striking and the nearest planetary nebula, yet any companions responsible for its asymmetric morphology have yet to be identified. In 2020, low-amplitude photometric variations with a periodicity of 2.8 d were reported based on Cycle 1 TESS observations. In this work, with the inclusion of two additional sectors, these peri…
Indication of a fast ejecta fragment in the atomic cloud interacting with the southwestern limb of SN 1006
Miceli, M.; Bocchino, F.; Orlando, S. +5 more
Context. Supernova remnants interacting with molecular and atomic clouds are interesting X-ray sources for studies of broadband nonthermal emission. X-ray line emission in these systems can be produced by different processes, such as low-energy cosmic rays (LECRs) interacting with the cloud and fast ejecta fragments moving in the cloud.
Aims:…
FLAME: Fitting Lyα absorption lines using machine learning
Vivek, M.; Jalan, P.; Khaire, V. +1 more
We introduce FLAME, a machine-learning algorithm designed to fit Voigt profiles to H I Lyman-alpha (Lyα) absorption lines using deep convolutional neural networks. FLAME integrates two algorithms: the first determines the number of components required to fit Lyα absorption lines, and the second calculates the Doppler parameter b, the H I column de…
AGN populations in the local Universe: Their alignment with the main sequence, stellar population characteristics, accretion efficiency, and the impact of AGN feedback
Georgantopoulos, I.; Mountrichas, G.; Akylas, A. +3 more
In this study, we used a sample of 338 galaxies - within the redshift range of 0.02 < z < 0.1 drawn from the Sloan Digital Sky Survey (SDSS) - for which there are available classifications based on their emission line ratios. We identified and selected Compton-thick (CT) AGN through the use of X-ray and infrared luminosities at 12 µm. …
The first ground-based detection of the 752 GHz water line in local ultraluminous infrared galaxies using APEX-SEPIA
Aalto, Susanne; Martín, Sergio; Zhang, Zhi-Yu +10 more
We report the first ground-based detection of the water line p-H2O (211-202) at 752.033 GHz in three z < 0.08 ultraluminous infrared galaxies (ULIRGs): IRAS 06035-7102, IRAS 17207-0014, and IRAS 09022-3615. Using the Atacama Pathfinder EXperiment (APEX), with its Swedish-ESO PI Instrument for APEX (SEPIA) band-9…