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Gas flows in the central region of the Seyfert galaxy NGC 4593 with MUSE
Knapen, J. H.; Comerón, S.; Pereira-Santaella, M. +4 more
Context. Understanding how gas flows into galactic centres, fuels the active galactic nucleus (AGN), and is in turn expelled back through feedback processes is of great importance to appreciate the role AGN play in the growth and evolution of galaxies. Aims. We use Multi Unit Spectroscopic Explorer-adaptive optics (MUSE-AO) optical spectra of the …
Detection of Close Kuiper Belt Binaries with HST WFC3
Porter, Simon B.; Verbiscer, Anne J.; Noll, Keith S. +3 more
Binaries in the Kuiper Belt are common. Here we present our analysis of the Solar System Origins Legacy Survey (SSOLS) to show that using a point-spread function (PSF)-fitting method can roughly double the number of binaries identified in that data set. Out of 198 Kuiper Belt objects (KBOs) observed by SSOLS, we find 23 to be visually separated bi…
A Star-based Method for the Precise Flux Calibration of the Chinese Space Station Telescope Slitless Spectroscopic Survey
Huang, Bowen; Yuan, Haibo; Xiao, Kai +5 more
The upcoming Chinese Space Station Telescope (CSST) slitless spectroscopic survey poses a challenge of flux calibration, which requires a large number of flux-standard stars. In this work, we design an uncertainty-aware residual attention network, the UaRA-net, to derive the CSST spectral energy distributions (SEDs) with a resolution of R = 200 ov…
Chandra and HST studies of the X-ray sources in the globular cluster NGC 362
Heinke, Craig O.; Cohn, Haldan N.; Lugger, Phyllis M. +1 more
We analyse a Chandra observation of the rich globular cluster NGC 362, finding 33 X-ray sources within 1 arcmin (1.2 half-mass radii) of the cluster centre. Spectral analysis of the brightest source (X1) shows blackbody-like emission, indicating it is likely a quiescent low-mass X-ray binary; we find a possible counterpart that falls in the sub-su…
Hubble Space Telescope proper motions of Large Magellanic Cloud star clusters: I. Catalogues and results for NGC 1850
Martocchia, S.; Cabrera-Ziri, I.; Bastian, N. +11 more
We present proper motion (PM) measurements for a sample of 23 massive star clusters within the Large Magellanic Cloud using multi-epoch data from the Hubble Space Telescope (HST). We combined archival data from the ACS/WFC and WFC3/UVIS instruments with observations from a dedicated HST programme, resulting in time baselines between 4.7 and 18.2 y…
The Lockman-SpReSO project. Main properties of infrared-selected star-forming galaxies
Krongold, Yair; Sánchez-Portal, Miguel; Bongiovanni, Ángel +18 more
Aims: In this work, we carry out a comprehensive study using galaxy data from the Lockman Spectroscopic Redshift Survey using Osiris (Lockman-SpReSO) project, a far-infrared (FIR) selected sample of galaxies observed using optical spectroscopy. We analyse a sub-sample of star-forming galaxies (SFGs) with secure spectroscopic redshifts, mostly…
Searching the SN 1987A SETI Ellipsoid with TESS
Davenport, James R. A.; Siemion, Andrew P. V.; Cody, Ann Marie +4 more
The SETI Ellipsoid is a strategy for technosignature candidate selection that assumes that extraterrestrial civilizations who have observed a galactic-scale event—such as supernova 1987A—may use it as a Schelling point to broadcast synchronized signals indicating their presence. Continuous wide-field surveys of the sky offer a powerful new opportu…
Ultra-long-period Cepheids as Standard Candles from Gaia to Rubin-LSST
Di Criscienzo, M.; Ripepi, V.; Molinaro, R. +10 more
An analysis of the properties of ultra-long-period Cepheids (ULPs) could significantly contribute to understanding the Hubble constant tension, e.g., the current discrepancy between determinations based on local distance indicators and those relying on cosmic microwave background measurements. These highly luminous variables are observable beyond …
Large Glacier-Like Forms on Mars: Insights From Crater Morphologies and Crater Retention Ages
El-Maarry, M. R.; Driver, G.; Hubbard, B. +1 more
Glacier-Like Forms (GLFs) are a subset of ice-rich landforms known as Viscous Flow Features that populate Mars' mid-latitudes. GLFs are morphologically similar to terrestrial valley glaciers and are thought to result from the redistribution of water ice from the Martian poles during periods of high obliquity throughout the Amazonian period. Their …
A comprehensive study of five candidate δ Scuti-type pulsators in detached eclipsing binaries
Hełminiak, K. G.; Konacki, M.; Moharana, A. +4 more
Context. Pulsating stars in eclipsing binaries (EBs) provide an excellent opportunity to obtain precise, model-independent stellar parameters for studying these oscillations in detail. One of the most common classes of pulsators found in such EBs exhibits δ Scuti-type oscillations. Characterising these pulsators using the precise stellar parameter…