Frizzle: Combining spectra or images by forward modeling David W. Hogg (NYU), Andrew R. Casey (Monash) arXiv:2403.11011v1 Announce Type: new Abstract: When there are many observations of an astronomical source – many images with different dithers, or many spectra taken at different barycentric velocities – it is standard practice to shift and stack the data, to (for example) make a high signal-to-noise average image or mean spectrum. Bound-saturating measurements are made by manipulating a likelihood function, where the data are treated as fixed, and model parameters are modified to fit the data. Traditional shifting and stacking of data can be converted into a model-fitting procedure,Read More →

Impact of Starlink constellation on Early LSST: a Photometric Analysis of Satellite Trails with BRDF Model Yao Lu arXiv:2403.11118v1 Announce Type: new Abstract: We report a simulation and quantification of the impact of the Starlink constellation on LSST in terms of the trail surface brightness using a BRDF-based satellite photometric model. A total of 11,908 satellites from the Gen1 and Gen2A constellations are used to focus on the interference to the initial phase of LSST operation. The all-sky simulation shows that approximately 69.33% of the visible satellites over station have an apparent brightness greater than 7 mag with a v1.5 satellite model. The impact ofRead More →

Periodicity of sub-pulses in a radio pulsar Peng-Fu Tian, Ping Zhang, Wen Yang, Wei Wang, Pei Wang arXiv:2403.11182v1 Announce Type: new Abstract: Pulsars are known to manifest complex phenomena, such as nulling, sub-pulse drifting, and periodicity. Within the purview of this investigation, we have harnessed the wavelet analysis technique to scrutinize the multifaceted periodicities and sub-pulse drifting characteristics exhibited by PSR J1926-0652, discovered by the Five-hundred-meter Aperture Spherical radio Telescope (FAST). Our analysis draws upon the rich dataset acquired from the FAST ultra-wide-bandwidth receiver (UWB), meticulously examining pulse attributes encompassing an entire pulse. It is notable that the pulse apex recurrently manifests approximately every 17.11Read More →

A sample of 25 radio galaxies with highly unusual radio morphologies, selected from the LoTSS-DR2 survey at 144 MHz Gopal-Krishna, Dusmanta Patra, Ravi Joshi arXiv:2403.11290v1 Announce Type: new Abstract: From a careful visual scrutiny of the radio structures of a well-defined sample of 2428 sources in the LoTSS DR2 survey made at 144 MHz with a 6″ beam, we have selected a subset of 25 (i.e., 1%) sources showing highly unusual radio structures, not conforming to the prevalent radio morphological classification. Here we present and briefly discuss the basic properties of these rare morphological outliers and attempt to dissect their morphological peculiarities, based on multi-wavelengthRead More →

SDSS~J075217.84+193542.2: X-ray weighing of a secondary BH Lev Titarchuk, Elena Seifina arXiv:2403.11319v1 Announce Type: new Abstract: Precise measurements of black hole (BHs) masses are necessary to understand the coevolution of these sources and their host galaxies. Sometimes in the center of a galaxy there is not one, but two BHs. The BH duality of the quasar nucleus SDSS~J075217.84+193542.2 (herein SDSS~J0752) was recently proposed based on the observed strict periodicity of optical emission from the source. We tested this assumption using X-ray observations with Swift/XRT (2008–2010). We fitted the SDSS~J075217 spectrum using a Comptonization model and discovered soft X-ray variability in the 0.3–10~keV energy range. WeRead More →

The redshift evolution of primordial black hole merger rate Viktor Stasenko arXiv:2403.11325v1 Announce Type: new Abstract: The gravitational wave signals detected by the LIGO-Virgo-KAGRA collaboration can be explained by mergers of binary primordial black holes (PBHs) formed in the radiation dominated epoch. However, in early structures induced by the Poisson distribution of PBHs, a significant fraction of binaries are perturbed and avoid mergers. In addition, the internal dynamics of early halos lead to the formation of dense primordial black hole clusters within a few Hubble times from the moment of halo formation. In such clusters PBH binaries are effectively formed and their mergers potentially dominateRead More →

Gamma-Ray Burst Pulses and Lateral Jet Motion Jon Hakkila, Geoffrey N. Pendleton, Robert D. Preece, Timothy W. Giblin arXiv:2403.11387v1 Announce Type: new Abstract: We propose that gamma-ray burst pulses are produced when highly-relativistic jets sweep across an observer’s line-of-sight. We hypothesize that axisymmetric jet profiles, coupled with special relativistic effects, produce the time-reversed properties of gamma-ray burst pulses. Curvature resulting from rapid jet expansion is responsible for much of the observed pulse asymmetry and hard-to-soft evolution. The relative obliqueness with which the jet crosses the line-of-sight explains the known GRB pulse morphological types. We explore two scenarios: one in which a rigid/semi-rigid jet moves laterally,Read More →

Resolving the Mechanical and Radiative Feedback in J1044+0353 with KCWI Spectral Mapping Crystal L. Martin, Zixuan Peng, Yuan Li arXiv:2403.11390v1 Announce Type: new Abstract: We present integral field spectroscopy toward and around J1044+0353, a rapidly growing, low-metallicity galaxy which produces extreme [O III] line emission. A new map of the O32 flux ratio reveals a density-bounded ionization cone emerging from the starburst. The interaction of the hydrogen ionizing radiation, produced by the very young starburst, with a cavity previously carved out by a galactic outflow, whose apex lies well outside the starburst region, determines the pathway for global Lyman continuum (LyC) escape. In the regionRead More →

Tidal Formation of dark matter deficit diffuse galaxy NGC1052-DF2 by SIDM Zhao-Chen Zhang, Xiao-Jun Bi, Peng-Fei Yin arXiv:2403.11403v1 Announce Type: new Abstract: Observations have revealed a significant dark matter deficit in the ultra-diffuse galaxy NGC1052-DF2 (DF2). It is widely accepted that the formation of this unique galaxy can be attributed to the tidal stripping of its host galaxy, NGC1052. In this study, we simulate the evolution of a satellite system containing globular clusters (GCs) within an accreting host halo in the framework of self-interacting dark matter (SIDM). Our simulation results suggest that the heightened tidal stripping resulting from self-interaction can give rise to the transformationRead More →

Solar chromospheric heating by magnetohydrodynamic waves: dependence on magnetic field inclination Mayu Koyama, Toshifumi Shimizu arXiv:2403.11419v1 Announce Type: new Abstract: A proposed mechanism for solar chromospheric heating is that magnetohydrodynamic waves propagate upward along magnetic field lines and dissipate their energy in the chromosphere. In particular, compressible magneto-acoustic waves may contribute to the heating. Theoretically, the components below the cutoff frequency cannot propagate into the chromosphere; however, the cutoff frequency depends on the inclination of the magnetic field lines. In this study, using high temporal cadence spectral data of IRIS and Hinode SOT spectropolarimeter (SP) in plages, we investigated the dependence of the low-frequency wavesRead More →

The rate and contribution of mergers to mass assembly from NIRCam observations of galaxy candidates up to 13.3 billion years ago Nicol`o Dalmasso, Antonello Calabr`o, Nicha Leethochawalit, Benedetta Vulcani, Kristan Boyett, Michele Trenti, Tommaso Treu, Marco Castellano, Maruv{s}a Bradav{c}, Benjamin Metha, Paola Santini arXiv:2403.11428v1 Announce Type: new Abstract: We present an analysis of the galaxy merger rate in the redshift range $4.0arXiv:2403.11428v1 Announce Type: new Abstract: We present an analysis of the galaxy merger rate in the redshift range $4.0Read More →

s-process Enriched Evolved Binaries in the Galaxy and the Magellanic Clouds Meghna Menon, Devika Kamath, Maksym Mohorian, Hans Van Winckel, Paolo Ventura arXiv:2403.11475v1 Announce Type: new Abstract: Post-asymptotic giant branch stars (post-AGB) in binary systems, with typical orbital periods between ~100 to ~1000 days, result from a poorly understood interaction that terminates their precursory AGB phase. The majority of these binaries display a photospheric anomaly called ‘chemical depletion’, thought to arise from an interaction between the circumbinary disc and the post-AGB star, leading to the reaccretion of pure gas onto the star, devoid of refractory elements due to dust formation. In this paper, we focusRead More →

The role of Ohmic dissipation of internal currents on Hot Jupiter radii Taner Akg"un, Cl`audia Soriano-Guerrero, Albert Elias-L’opez, Daniele Vigan`o, Rosalba Perna, Fabio Del Sordo arXiv:2403.11501v1 Announce Type: new Abstract: The inflated radii observed in hundreds of Hot Jupiters represent a long-standing open issue. The observed correlation between radii and irradiation strength, and the occasional extreme cases, nearly double the size of Jupiter, remain without a comprehensive quantitative explanation. In this investigation, we delve into this issue within the framework of Ohmic dissipation, one of the most promising mechanisms for explaining the radius anomaly. Using the evolutionary code MESA, we simulate the evolution of irradiatedRead More →

Probing cold gas with Mg II and Ly$alpha$ radiative transfer Seok-Jun Chang, Max Gronke arXiv:2403.11524v1 Announce Type: new Abstract: The Mg II resonance doublet at 2796 {AA} and 2803 {AA} is an increasingly important tool to study cold, $T sim 10^{4},$K, gas — an observational driven development requiring theoretical support. We develop a new Monte Carlo radiative transfer code to systematically study the joined Mg II and Ly$alpha$ escape through homogeneous and `clumpy’ multiphase gas with dust in arbitrary 3D geometries. Our main findings are: (i) The Mg II spectrum differs from Ly$alpha$ due to the large difference in column densities, even though the atomicRead More →

Detecting superfluid transition in the pulsar core Partha Bagchi (School of Physical Sciences, National Institute of Science Education and Research, Bhubaneswar, India), Biswanath Layek (Department of Physics, Birla Institute of Technology and Science, Pilani-333031, India), Dheeraj Saini (Physics Department, The LNM Institute of Information Technology, Jaipur-302031, India), Anjishnu Sarkar (Physics Department, The LNM Institute of Information Technology, Jaipur-302031, India), Ajit M. Srivastava (Institute of Physics, Sachivalaya Marg, Bhubaneswar-751005, India), Deepthi Godaba Venkata (Department of Physics, Birla Institute of Technology and Science, Pilani-333031, India) arXiv:2403.11539v1 Announce Type: new Abstract: It is believed that the core of a neutron star can be host to various novel phasesRead More →

Logistic regression to boost exoplanet detection performances Hadrien Cambazard (G-SCOP), Nicolas Catusse (G-SCOP), A. Chomez, A. -M. Lagrange, Pierre Vieu arXiv:2403.11571v1 Announce Type: new Abstract: Direct imaging of exoplanets requires to separate the background noise from the exoplanet signals. Statistical methods have been recently proposed to avoid subtracting any signal of interest as opposed to initial self-subtracting methods based on Angular Differential Imaging (ADI). However, unless conservative thresholds are chosen to claim for a detection, such approaches tend to produce a list of candidates that include many false positives. Choosing high, conservative, thresholds leads to miss the faintest planets. We extend a statistical framework withRead More →

Effects of galaxy environment on merger fraction W. J. Pearson, D. J. D. Santos, T. Goto, T. -C. Huang, S. J. Kim, H. Matsuhara, A. Pollo, S. C. -C. Ho, H. S. Hwang, K. Ma{l}ek, T. Nakagawa, M. Romano, S. Serjeant, L. Suelves, H. Shim, G. J. White arXiv:2403.11615v1 Announce Type: new Abstract: Aims. In this work, we intend to examine how environment influences the merger fraction, from the low density field environment to higher density groups and clusters. We also aim to study how the properties of a group or cluster, as well as the position of a galaxy in the group or cluster,Read More →

GLACE survey: OSIRIS/GTC tuneable imaging of the galaxy cluster ZwCl 0024.0+1652 II. The mass–metallicity relationship and the effect of the environment Bernab’e Cedr’es, Simon B. De Daniloff, ‘Angel Bongiovanni, Miguel S’anchez-Portal, Miguel Cervi~no, Ricardo P’erez-Mart’inez, Ana Mar’ia P’erez-Garc’ia, Jordi Cepa, Maritza A. Lara-L’opez, Mauro Gonz’alez-Otero, Manuel Castillo-Fraile, Jos’e Ignacio Gonz’alez-Serrano, Castalia Alenka Negrete, Camen P. Padilla-Torres, Irene Pintos-Castro, Mirjana Povic, Emilio Alfaro1, Zeleke Beyoro-Amado, Irene Cruz-Gonz’alez, Jos’e A. de Diego, Roc’io Navarro Mart’inez, Brisa Mancillas, M’onica I. Rodr’iguez, Iv’an Valtchanov arXiv:2403.11629v1 Announce Type: new Abstract: In this paper, we revisit the data for the galaxy cluster ZwCl 0024.0+1652 provided by the GLACE survey and studyRead More →

The FAST Galactic Plane Pulsar Snapshot Survey: V. PSR J1901+0658 in a double neutron star system W. Q. Su, J. L. Han, Z. L. Yang, P. F. Wang, J. P. Yuan, C. Wang, D. J. Zhou, T. Wang, Y. Yan, W. C. Jing, N. N. Cai, L. Xie, J. Xu, H. G. Wang, R. X. Xu, X. P. You arXiv:2403.11635v1 Announce Type: new Abstract: Double neutron star (DNS) systems offer excellent opportunities to test gravity theories. We report the timing results of a pulsar, PSR J1901+0658, discovered in the FAST Galactic Plane Pulsar Snapshot (GPPS) survey. Based on timing observations by FAST over 5 years,Read More →

Small-scale magnetic flux emergence preceding a chain of energetic solar atmospheric events D. N’obrega-Siverio, I. Cabello, S. Bose, L. H. M. Rouppe van der Voort, R. Joshi, C. Froment, V. M. J. Henriques arXiv:2403.11652v1 Announce Type: new Abstract: Advancements in instrumentation have revealed a multitude of small-scale EUV events in the solar atmosphere. Our aim is to employ high-resolution magnetograms to gain a detailed understanding of the magnetic origin of such phenomena. We have used coordinated observations from SST, IRIS, and SDO to analyze an ephemeral magnetic flux emergence episode and the following chain of small-scale energetic events. These unique observations clearly link these phenomenaRead More →