Monthly Notices of the Royal Astronomical Society

Abstract Rotating radio transients (RRATs) represent a significant but poorly understood component of the Galactic neutron star population, characterized by sporadic emission first detectable only through single-pulse searches. We present the RRATalog, an up-to-date catalogue of 335 RRATs, and utilize a uniform sample of RRATs discovered in four Parkes telescope surveys to model their Galactic po…

Abstract We present a detailed study of the inner regions of NGC 7582, a nearby Seyfert 2 galaxy, from the Galaxy Activity, Torus and Outflow Survey (GATOS). The galaxy hosts a circumnuclear star-forming disk and an AGN-driven biconical ionised outflow. Using JWST NIRSpec and MIRI/MRS integral-field spectroscopy, we analyse ionic emission lines spanning a wide range of ionisation potentials (IPs,…

Abstract Using public data from the Katzman Automatic Imaging Telescope (KAIT) and the Zwicky Transient Facility (ZTF), we constructed an R band light curve dataset spanning over 5000 days for 135 blazars, and investigated their quasi-periodic oscillations (QPOs) via the generalized Lomb-Scargle (GLS) and Weighted Wavelet Z-transform (WWZ) methods. With certain empirical criteria, we detected fou…

Abstract We probe the stellar mass growth in a sample of 568 Sunyaev-Zel’dovich (SZ) selected galaxy clusters with masses greater than 2.9 × 1014M⊙ and redshifts in the range 0.2 < z < 0.8, drawn from the fifth data release of the Atacama Cosmology Telescope (ACT DR5). By utilising deep photometry from the tenth data release of the Dark Energy Camera Legacy Survey (DECaLS DR10), we …

Abstract Active galactic nuclei (AGN) jets are powerful drivers of galaxy evolution, depositing energy and momentum into the circumgalactic and intracluster medium (CGM/ICM) and regulating gas cooling and star formation. We investigate the dynamics of jet evolution in the self-similar regime using the smoothed particle hydrodynamics (SPH) code GADGET4-Osaka, systematically vary jet-launching sche…

Abstract The Fermi Large Area Telescope (LAT) has detected a large number of γ-ray-emitting sources, among which jet-dominated active galactic nuclei (AGN) are typically classified as BL Lac objects or flat-spectrum radio quasars based on their spectral properties. However, recent observations have revealed a growing number of jet-dominated AGNs exhibiting transition behaviors between these two s…

Abstract The radio–X-ray correlation and Fundamental Plane (FP) of black hole activity can serve as a diagnostic tool for the origin of X-ray emissions. There was a scaling relation between radio and X-ray emissions for High-synchrotron-peaked BL Lacertae objects (HBLs), i.e., $L_{\rm {R}}\propto L_{\rm {X}}^{0.64}$, which can be explained by ADAF-dominated mode or synchrotron cooling (Syn-c). Ho…

Abstract Changing-look transitions challenge our understanding of active galactic nuclei (AGN), exhibiting dramatic changes in broad-line emission and continuum flux on timescales of months to years. We present a detailed study of the spectroscopically confirmed changing-look AGN ZTF18abuamgo. Combining photometric survey data with spectroscopy spanning three epochs over 20 years, we identify a t…

Abstract A key question in extragalactic astronomy is how the star-formation rate density (SFRD) evolves over cosmic time. A powerful way of addressing this question is using radio-continuum observations, where the radio waves are unaffected by dust and are able to reach sufficient resolution to resolve individual galaxies. We present an investigation of the 1.4 GHz radio luminosity functions (RL…

Abstract DES-5Y supernovae, combined with DESI BAO, appear to favour Chevallier–Polarski–Linder (w0, wa) dynamical dark energy over ΛCDM. It has been suggested in other work that this is driven by a systematic in the DES pipeline, which particularly affects the low-redshift supernovae brought in from legacy surveys. It is difficult to investigate these data in isolation, however, as the complicat…

Abstract We describe the software package ESpRESSO - [E]xtragalactic [Sp]ectroscopic [R]oman [E]mulator and [S]imulator of [S]ynthetic [O]bjects, created to emulate the slitless spectroscopic observing modes of the Nancy Grace Roman Space Telescope (Roman) Wide Field Instrument (WFI). We combine archival Hubble Space Telescope (HST) imaging data of comparable spatial resolution with model spectra…

Abstract Extremely low metallicity stars are intensely studied as they take observations the closest to the very first generations of stars in the universe. Widely assumed to be enriched by just one dying massive star, some of these very metal poor stars have abnormal chemical abundance ratios and have been taken to reflect a rare hypernova (with high explosion energy ≳ 1052 erg.). Here we remode…

Abstract Using JWST/NIRCam data over a 0.28 deg2 area from COSMOS-Web survey, together with HST/ACS data, we investigate early-type fraction of massive galaxies with Mstar > 1010.5M⊙ at 0.2 < z < 2.0, and explore the formation of their early-type morphology. We measure concentration index C (=R80/R20) and asymmetry index A, and select early-type galaxies with C > Cn = …

Abstract The blazar Mrk 501 still poses challenging questions for astrophysics, primarily because of the different orientations observed at pc- and kpc-scales. A much debated issue is whether its core harbors a supermassive binary black hole (SMBBH). We re-model and re-analyze 83 datasets observed with the Very Long Baseline Array (VLBA) (2011/09/24 – 2023/07/24) at 43 GHz and compare them with e…

Abstract On 12 November 2021 a Taurid fireball with an absolute magnitude of -13 was recorded over Spain. This work presents the analysis of this impressive bolide, which penetrated the atmosphere till a remarkable low final height of about 25.1 km above the ground level. A non-zero mass was calculated at the ending point of the luminous trajectory, which means that this event would have produced…

Abstract In this paper, the wind field characteristics and optical turbulence profiles at the Muztagh-ata site are characterized using a Coherent Doppler Wind Lidar (CDWL) and a seeing monitor. A distinct stratified wind structure with significant seasonal and diurnal variations is observed at the site; wind speeds are higher in winter and lower in summer, with a stable prevailing wind direction …

Abstract Resolved rotation curves (RCs) are our best probe of the dark matter distribution around individual galaxies. However their acquisition is resource-intensive, rendering them impractical for large-scale surveys and studies at higher redshift. Spatially integrated Hi flux profiles on the other hand are observationally abundant and also probe dynamics across the whole Hi disc. Despite this,…

Abstract Studying samples of young star-forming regions allows us to statistically examine the evolution of their natal gas and dust along with the associated timescales in the volatile early stages of their lives. With the PHANGS survey data, we analyze the diversity of spectral energy distributions (SEDs) for the rich sample of massive star-forming regions found in NGC 1365. By combining unique…

Abstract Accurate atomic parameters are essential for reliable spectral synthesis, particularly in the ultraviolet range, where line blending and parameter degeneracy pose significant challenges. In this feasibility test, we apply different optimization techniques to calibrate the atomic data of central wavelength, oscillator strength and damping parameters by minimizing the difference between th…

Abstract We present a suite of high-resolution simulations to study how different stellar feedback channels regulate the growth of central intermediate-mass black holes (IMBHs) in dwarf galaxies hosting nuclear star clusters (NSCs). We employ a super-Lagrangian refinement scheme to resolve the self-gravity radius of the α-accretion disc (<0.01 pc) and follow the gas inflows from the inters…