Astronomical Observatory

Breaking the Blend: A multi-tracer kinematic decomposition method for IFS data applied to disentangling the AGN outflow and circumnuclear ring in NGC 5728 with JWST

Abstract Integral field spectroscopy (IFS) of the central kiloparsecs of active galactic nuclei (AGN) reveals a mixture of spatially coincident emission from star-formation and AGN feedback exciting the interstellar medium. Disentangling these components remains a challenge, as m...

Studies of Two Post Common Envelope Binary Stars

Abstract New time series photometry of the short period (P < 0.2 d) binary stars ZTF J032906.36+070408.3 (ZTF 0329) and ATO J090.7238+00.5996 (ATL 0602) is presented. The primary (hotter) stars in both systems are white dwarfs, while the cooler stars are M dwarfs. Archival photom...

Exact black hole solutions with semi-symmetric vectorial torsion

Abstract Semi-Symmetric Metric Gravity extends general relativity by introducing a semi-symmetric connection with vectorial torsion. The modified field equations contain extra contributions from the torsion vector and its derivatives. Assuming a purely radial torsion vector consi...

A complete correspondence between the Newman–Penrose and 1+1+2 formalisms

Abstract We establish a correspondence between the Newman–Penrose and 1+1+2 semitetrad covariant formalisms by expressing all Newman–Penrose spin coefficients, Ricci scalars, and Weyl scalars in terms of the scalar, vector, and tensor variables of the 1+1+2 decomposition. In addi...

Validation and Spin of the Bright Part of Gaia DR2 and DR3

ABSTRACT The Gaia Data Release 3 (DR3) is an important step in the realization of the future Gaia reference frame. Ideally, across G magnitudes from 3 to 21, the Gaia DR2 and DR3 objects with their positions (, ) and proper motions (, ) should be expressed in a nonrotating refere...

eRASSU J043115.8-711730 The first pulsating symbiotic super-soft X-ray source in the Magellanic Bridge

Abstract The Magellanic Bridge stellar population is a relic of the tidal interaction between the Large and Small Magellanic Clouds. A comprehensive view of the evolution of the Bridge stellar population requires probing the compact remnants of stellar evolution, otherwise hidden...