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Outlier Detection in the DESI Bright Galaxy Survey
Melchior, Peter; Ward, Charlotte; Goulding, Andy +3 more
We present an unsupervised search for outliers in the Bright Galaxy Survey (BGS) data set from the DESI Early Data Release. This analysis utilizes an autoencoder to compress galaxy spectra into a compact, redshift-invariant latent space, and a normalizing flow to identify low-probability objects. The most prominent outliers show distinctive spectr…
Shocks and Photoionization of the Inner 650 au Jet of the Interacting Binary Star R Aquarii from Multiwavelength Hubble Space Telescope Observations
Montez, Rodolfo; Raymond, John C.; Karovska, Margarita +3 more
Astrophysical jets are present in a range of environments, including young stellar objects, X-ray binaries, and active galactic nuclei, but their formation is still not fully understood. As one of the nearest symbiotic binary stars, R Aquarii (D ~ 220 pc) offers a unique opportunity to study the inner region within ~600 au of the jet source, which…
Spectroscopic survey of faint planetary-nebula nuclei - II. The subdwarf O central star of Fr 2-30
Bond, Howard E.; Zeimann, Gregory R.; Werner, Klaus +1 more
Fr 2-30 = PN? G126.8-15.5 is a faint emission nebula, hosting a 14th-mag central star that we identify here for the first time. Deep Hα and [O III] images reveal a roughly elliptical nebula with dimensions of at least 22 arcmin × 14 arcmin, fading into a surrounding network of even fainter emission. Optical spectrograms of the central star show it…
Studying X-ray instruments with galaxy clusters
Molendi, S.; Nevalainen, J.
Aims: Our aim is to apply a scientific approach to the problem of the effective area cross-calibration of the XMM-Newton EPIC instruments. Using a sample of galaxy clusters observed with XMM-Newton EPIC, we aim to quantify the effective area cross-calibration bias between the EPIC instruments as implemented in the public calibration database …
A Dwarf Galaxy Debris Stream Associated with Palomar 1 and the Anticenter Stream
Tan, Ke-Feng; Zhao, Gang; Zhao, Jing-Kun +2 more
We report the discovery of a new stream (dubbed as Yangtze) detected in Gaia Data Release 3. The stream is at a heliocentric distance of ~9.12 kpc and spans nearly 27° by 1.°9 on the sky. The color-magnitude diagram of Yangtze indicates a stellar population of age ~11 Gyr and [M/H] ~ -0.7 dex. It has a number density of about 5.5 stars deg-2<…
Change detection and monitoring of active Martian surface phenomena with the Colour and Stereo Surface Imaging System (CaSSIS) onboard the ExoMars Trace Gas Orbiter (TGO)
Seelos, Frank P.; Tornabene, Livio L.; Osinski, Gordon R. +10 more
Mars is host to a variety of active surface processes that relate to changes in seasonal ice/frost, slope activity, wind and processes potentially relating to liquid water. Regular monitoring and change detection of these phenomena is crucial to not only provide us insights into present day Martian surface conditions, but also its past geologic an…
CHEX-MATE: A non-parametric deep learning technique to deproject and deconvolve galaxy cluster X-ray temperature profiles
Arnaud, M.; Pointecouteau, E.; Pratt, G. W. +21 more
Temperature profiles of the hot galaxy cluster intracluster medium (ICM) have a complex non-linear structure that traditional parametric modelling may fail to fully approximate. For this study, we made use of neural networks, for the first time, to construct a data-driven non-parametric model of ICM temperature profiles. A new deconvolution algori…
Optical spectroscopy of Gaia detected protostars with DOT: Can we probe protostellar photospheres?
Mathew, Blesson; Manoj, P.; Narang, Mayank +7 more
Optical spectroscopy offers the most direct view of the stellar properties and the accretion indicators. Standard accretion tracers, such as H
Internal kinematics of dwarf satellites of MW/M31-like galaxies in TNG50
van der Marel, Roeland P.; del Pino, Andrés; Aparicio, Antonio +2 more
We present a kinematic study of a thousand of dwarf satellites of MW/M31-like hosts from the IllustrisTNG50 simulation. Internal kinematics were derived for all the snapshots to obtain a historical record of their rotation velocity in the plane of the sky (|VT|) and the amplitude of their velocity gradients along the line of sight ($A_{…
Far-ultraviolet Dust Extinction and Molecular Hydrogen in the Diffuse Milky Way Interstellar Medium
Gordon, Karl D.; Van De Putte, Dries; Cartledge, Stefan I. B. +2 more
We aim to compare variations in the full-UV dust extinction curve (912-3000 Å), with the H I/H2/total H content along diffuse Milky Way sightlines, to investigate possible connections between ISM conditions and dust properties. We combine an existing sample of 75 UV extinction curves based on IUE and FUSE data, with atomic and molecular…