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Unveiling the main sequence to starburst transition region with a sample of intermediate redshift luminous infrared galaxies
Magdis, G. E.; Rigopoulou, D.; Combes, F. +8 more
We present a CO(3-2) study of four systems composed of six (ultra) luminous infrared galaxies (U/LIRGs), located at 0.28 <z < 0.44, that straddle the transition region between regular star-forming galaxies and starbursts. These galaxies benefit from previous multiwavelength analysis allowing in depth exploration of an understudied population…
Standing Solitary Waves as Transitions to Spiral Structures in Gravitationally Unstable Accretion Disks
Deng, Hongping; Ogilvie, Gordon I.
Astrophysical disks that are sufficiently cold and dense are linearly unstable to the formation of axisymmetric rings as a result of the disk's gravity. In practice, spiral structures are formed, which may in turn produce bound fragments. We study a nonlinear dynamical path that can explain the development of spirals in a local model of a gaseous …
Correlated variability of the reflection fraction with the X-ray flux and spectral index for Mrk 478
Jithesh, V.; Medhi, Biman J.; Misra, Ranjeev +2 more
The X-ray spectrum of Mrk 478 is known to be dominated by a strong soft excess that can be described using relativistic blurred reflection. Using observations from XMM-Newton, AstroSat, and Swift, we show that for the long-term (~years) and intermediate-term (days to months) variability, the reflection fraction is anticorrelated with the flux and …
Ionized filaments and ongoing physical processes in massive-star-forming sites around l = 345.°5
Dewangan, L. K.; Pirogov, L. E.; Bhadari, N. K. +1 more
Numerous research studies on dust and molecular filaments in star-forming sites have been conducted, but only a limited number have focused on ionized filaments. To observationally study this aspect, we present an analysis of multiwavelength data from an area of ~74.6 arcmin × 55 arcmin around l = 345${_{.}^{\circ}}$5. Using the 843-MHz continuum …
An Infrared View of the Obscured AGN Environment in NGC 4945
Schirmer, M.; Díaz, R. J.; Agüero, M. P. +4 more
NGC 4945 harbors one of the nearest active galactic nuclei (AGNs), which allows us to reach high spatial resolution with current observational facilities. The Seyfert 2 nucleus is deeply obscured by an edge-on disk with A V ~ 14, requiring infrared observations to study circumnuclear structures and the interstellar medium. In this wor…
Observations and Modeling of Martian Auroras
Haider, S. A.; Bougher, S. W.; Schneider, N. M. +4 more
Observations of planetary auroras form a new area of planetary exploration from space, especially for nonmagnetic planets since various kinds of auroras like Discrete, Proton and Diffuse auroras have been observed at Mars. We review the latest results of Martian auroras obtained by the instruments (1) SPICAM (Spectroscopy for the Investigation of …
Ganymede's Auroral Footprint Latitude: Comparison With Magnetodisc Model
Bonfond, B.; Nichols, J. D.; Vogt, M. F. +3 more
Variations of Ganymede's auroral footprint locations are presented based on observations by the Hubble Space Telescope in 2007 and 2016. The poleward and equatorward shifts of Ganymede's footprint could be influenced by the mass outflow rate from Io and the solar wind compression, as the internal and external factors respectively. We compare our r…
Precise Positions of Five Major Uranian Satellites During 2008-2014 Based on Gaia EDR3
Cheng, X.; Zhang, H. Y.; Yan, D. +4 more
The five major Uranian satellites (Ariel, Umbriel, Titania, Oberon, and Miranda) were observed by a 1.56 m telescope at Sheshan Station of Shanghai Astronomical Observatory during 2008-2014 and a total of 1915 positions of these five satellites were presented in this paper. Since all five satellites are close to Uranus, their positions are affecte…
Revisiting Kepler Transiting Systems: Unvetting Planets and Constraining Relationships among Harmonics in Phase Curves
Shporer, Avi; de Wit, Julien; Wong, Ian +1 more
Space-based photometric missions widely use statistical validation tools for vetting transiting planetary candidates, particularly when other traditional methods of planet confirmation are unviable. In this paper, we refute the planetary nature of three previously validated planets-Kepler-854 b, Kepler-840 b, and Kepler-699 b-and possibly a fourth…
Apsidal Motion and Physical Parameters in the Eclipsing System V490 Sct
Volkov, Igor M.; Kravtsova, Alexandra S.
We report long-term UBVRIR c I c photometry of the highly eccentric 12.04 day detached eclipsing binary V490 Sct (V = 13.1, B9.5+A0, e = 0.40), which we use to determine its relative and absolute parameters. The absolute masses, radii, and temperatures are M A = 2.33 ± 0.07 M⊙, R A = 1…