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Discovery of 22 GHz Water Masers in the Serpens South Region
Gong, Yan; Pillai, Thushara; Loinard, Laurent +5 more
Using the Karl G. Jansky Very Large Array (VLA), we have conducted a survey for 22 GHz, 61,6-52,3 H2O masers toward the Serpens South region. The masers were also observed with the Very Long Baseline Array following the VLA detections. We detect for the first time H2O masers in the Serpens South region t…
AstroSat view of the NLS1 galaxy Mrk 335
Dewangan, Gulab C.; Misra, Ranjeev; Ezhikode, Savithri H.
We present the results from the multi-wavelength monitoring observations of the Narrow-Line Seyfert 1 galaxy Mrk 335 with AstroSat. We analysed both the X-ray (SXT and LAXPC) and UV (UVIT) data of the source at two epochs, separated by
Small-scale Bright Blobs Ejected from a Sunspot Light Bridge
Hou, Yijun; Chen, Yajie; Song, Yongliang +3 more
Light bridges (LBs) are bright lanes that divide an umbra into multiple parts in some sunspots. Persistent oscillatory bright fronts at a temperature of ∼105 K are commonly observed above LBs in the 1400/1330 Špassbands of the Interface Region Imaging Spectrograph (IRIS). Based on IRIS observations, we report small-scale bright blobs ej…
UV spectroscopy confirms SU Lyn to be a symbiotic star
Joshi, Vishal; Kumar, Vipin; Srivastava, Mudit K. +1 more
SU Lyn, a star that ostensibly appears to be an unremarkable late M type giant, has recently been proposed to be a symbiotic star largely based on its hard X-ray properties. The star does not display, in low-resolution optical spectra, the high excitation lines typically seen in the spectra of symbiotic stars. In this work, ultraviolet (UV), optic…
Ground-Based Observations of the ZZ Ceti Star HS 1625+1231
Sódor, Á.; Kalup, Cs; . Bognár, Zs.
We present the results of our detailed light curve analysis of the ZZ Ceti star HS 1625+1231. We collected photometric time series data at Konkoly Observatory on 14 nights, and performed Fourier analysis of these data sets. We detected 11 significant frequencies, where six of them are found to be independent pulsation modes in the 514-881 s period…
Divergence and Vorticity of Subsurface Flows During Solar Cycles 23 and 24
Howe, R.; Komm, R.; Hill, F.
We study the solar-cycle variation of the divergence and vorticity of subsurface horizontal flows from the surface to a depth of 16 Mm. The flows were derived with ring-diagram analysis applied to Michelson Doppler Imager (MDI) Dynamics Program, Global Oscillation Network Group (GONG), and Helioseismic and Magnetic Imager (HMI) Dopplergrams. We st…
First detection of a disk free of volatile elements around a young A-type star: A possible sign of collisions between rocky planets
Manara, C. F.; Miles-Páez, P. A.; van den Ancker, M. E. +7 more
Aims: We present the first detailed analysis of the astrophysical parameters of the poorly studied Sco-Cen member HD 152384 and its circumstellar environment.
Methods: We analyse newly obtained optical-near-IR X-shooter spectra, as well as archival TESS data, of HD 152384. In addition, we use literature photometric data to construct a de…
IllustrisTNG and S2COSMOS: possible conflicts in the evolution of neutral gas and dust
Smith, Matthew W. L.; Gomez, Haley L.; Millard, Jenifer S. +3 more
We investigate the evolution in galactic dust mass over cosmic time through (i) empirically derived dust masses using stacked submillimetre fluxes at 850 µm in the COSMOS field and (ii) dust masses derived using a robust post-processing method on the results from the cosmological hydrodynamical simulation IllustrisTNG. We effectively perform…
Atomic structure for carbon-like ions from Na VI to Ar XIII
Almodlej, A.; Alrashed, H.; Ben Nessib, N. +1 more
We have calculated the energy levels, oscillator strengths, and transition probabilities for eight carbon-like ions (Na VI, Mg VII, Al VIII, Si IX, P X, S XI, Cl XII and Ar XIII) using the Hartree-Fock pseudo-relativistic (HFR) and Thomas-Fermi-Dirac-Amaldi (TFDA) approaches. We used configuration expansions containing eight configurations, namely…
Destruction of Galaxies as a Cause of the Appearance of Stellar Streams
Vereshchagin, S. V.; Tutukov, A. V.; Sizova, M. D.
The interaction of galaxies in clusters with the intergalactic gaseous medium and other galaxies is considered. The causes for the appearance of gaseous and stellar "tails" and stellar "copies" of galaxies during their movement in a dense gaseous medium in the cores of clusters and during the tidal destruction of colliding galaxies are studied. Th…