Search Publications
Milky Way-like galaxies: stellar population properties of dynamically defined discs, bulges and stellar haloes
Tissera, Patricia B.; Obreja, Aura; Ortega-Martinez, Sara +3 more
The formation of galaxies can be understood in terms of the assembly patterns of each type of galactic component. To perform this kind of analysis, it is necessary to define some criteria to separate those components. Decomposition methods based on dynamical properties are more physically motivated than photometry-based ones. We use the unsupervis…
The HDO Cycle on Mars: Comparison of ACS Observations With GCM Simulations
Montmessin, Franck; Trokhimovskiy, Alexander; Alday, Juan +10 more
The D/H ratio and its implications on the atmospheric escape, make it an essential observable to study the current and past inventory of water on Mars. With the arrival of the Trace Gas Orbiter around Mars, new measurements of the D/H ratio are now available and require tools to interpret the observations and understand the HDO cycle. We here pres…
Optical Observations of the Nearby Type Ia Supernova 2021hpr
Zhang, Yu; Zhang, Tianmeng; Wu, Hong +6 more
We present the optical photometric and spectroscopic observations of the nearby Type Ia supernova (SN) 2021hpr. The observations covered the phase of -14.37 to +63.68 days relative to its maximum luminosity in the B band. The evolution of multiband light/color curves of SN 2021hpr is similar to that of normal Type Ia supernovae (SNe Ia) with the e…
SWIFT J0503.7-2819: a nearly synchronous intermediate polar below the period gap?
Pandey, J. C.; Scaringi, Simone; Joshi, Arti +2 more
Based on the X-ray observations from XMM-Newton and Swift, and optical observations from Transiting Exoplanet Survey Satellite (TESS) and AAVSO, we present temporal and spectral properties of probable intermediate polar SWIFT J0503.7-2819. The X-ray light curve shows two distinctive features, where possibly the second pole seems to be active durin…
Young, Blue, and Isolated Stellar Systems in the Virgo Cluster. II. A New Class of Stellar System
Cresci, Giovanni; Cannon, John M.; Haynes, Martha P. +21 more
We discuss five blue stellar systems in the direction of the Virgo cluster, analogous to the enigmatic object SECCO 1 (AGC 226067). These objects were identified based on their optical and UV morphology and followed up with H I observations with the Very Large Array (and Green Bank Telescope), Multi Unit Spectroscopic Explorer (on the Very Large T…
Searching for nascent planetary nebulae: OHPNe candidates in the SPLASH survey
Miranda, Luis F.; de Gregorio-Monsalvo, Itziar; Imai, Hiroshi +7 more
The evolution of asymptotic giant branch stars from the spherical symmetry into the diverse shapes of planetary nebulae (PNe) is a topic of intensive research. Young PNe provide a unique opportunity to characterize the onset of this transitional phase. In particular, OH maser-emitting PNe (OHPNe) are considered nascent PNe. In fact, only six OHPNe…
A comprehensive photometric and kinematical characteristic of the newly discovered QCs clusters with Gaia EDR3
Elsanhoury, W. H.; Haroon, A. A.; Amin, Magdy Y. +1 more
This study reports the first comprehensive astrometric, photometric, and kinematical analysis of four newly discovered open clusters; namely QC1, QC2, QC3, and QC4, using astrometric and photometric data from the most recent Gaia EDR3 for
QU Vul: An integral field spectroscopy case study of a nova shell
Guerrero, M. A.; Toalá, J. A.; Santamaría, E. +2 more
We present GTC MEGARA high-dispersion integral field spectroscopic observations of the nova remnant QU Vul, which provide a comprehensive 3D view of this nova shell. The tomographic analysis of the H α emission reveals a complex physical structure characterized by an inhomogeneous and clumpy distribution of the material within this shell. The over…
New Results from the Spectral Observations of Solar Coronal Type II Radio Bursts
Ramesh, R.; Kathiravan, C.; Natarajan, S. Surya
We carried out a statistical study of twenty-six type II radio bursts from the Sun observed with the Gauribidanur Low-frequency Solar Spectrograph in the frequency range 85-35 MHz during the period 2009-2019. Our results indicate that the average instantaneous bandwidth of the type II bursts in the above frequency range correlates with the angular…
Broadband X-Ray Spectral Analysis of the Dual AGN System Mrk 739
Tanimoto, Atsushi; Ueda, Yoshihiro; Ricci, Claudio +4 more
We present the result of a broadband (0.5-70 keV) X-ray spectral analysis of the late-merger galaxy Mrk 739, which contains a dual active galactic nucleus (AGN), Mrk 739E and Mrk 739W, with a separation of ≈3.4 kpc. The spectra obtained with NuSTAR, Chandra, XMM-Newton, and Swift/BAT are simultaneously analyzed by separating the contributions from…