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Physical and Kinematical Characteristics of Wolf-Rayet Central Stars and their Host Planetary Nebulae
Ali, A.; Awad, Z.
We address the physical and kinematical properties of Wolf-Rayet [WR] central stars (CSs) and their host planetary nebulae (PNe). The studied sample comprises all [WR] CSs that are currently known. The analysis is based on recent observations of the parallax, proper motion, and color index of [WR] CSs from the Gaia space mission's early third rele…
Investigation of Stellar Kinematics and Ionized Gas Outflows in Local (U)LIRGs
Kilerci, Ece; Wang, Shu; Zou, Fan +4 more
We explore the properties of stellar kinematics and ionized gas in a sample of 1106 local (U)LIRGs from the AKARI telescope. We combine data from Wide-field Infrared Survey Explorer and Sloan Digital Sky Survey Data Release 13 to fit the spectral energy distribution (SED) of each source to constrain the contribution of active galactic nuclei (AGNs…
Exploring the evidence of Middle Amazonian aquifer sedimentary outburst residues in a Martian chaotic terrain
Kargel, Jeffrey S.; Berman, Daniel C.; Rodriguez, J. Alexis P. +7 more
The quest for past Martian life hinges on locating surface formations linked to ancient habitability. While Mars' surface is considered to have become cryogenic ~3.7 Ga, stable subsurface aquifers persisted long after this transition. Their extensive collapse triggered megafloods ~3.4 Ga, and the resulting outflow channel excavation generated vol…
Catalog of Integrated-light Star Cluster Light Curves in TESS
Davenport, James R. A.; Pepper, Joshua; Fetherolf, Tara +10 more
We present the first integrated-light, TESS-based light curves for star clusters in the Milky Way, Small Magellanic Cloud, and Large Magellanic Cloud. We explore the information encoded in these light curves, with particular emphasis on variability. We describe our publicly available package elk, which is designed to extract the light curves by ap…
Comparison of distance measurements to dust clouds using GRB X-ray haloes and 3D dust extinction
Tiengo, A.; Bošnjak, Ž.; Pintore, F. +3 more
X-ray photons from energetic sources such as gamma-ray bursts (GRBs) can be scattered on dust clouds in the Milky Way, creating a time-evolving halo around the GRB position. X-ray observations of such haloes allow the measurement of dust cloud distances in the Galaxy on which the scattering occurs. We present the first systematic comparison of the…
A colourful analysis: Probing the eclipse of the black hole and central engine in NGC 6814 using X-ray colour-colour grids
Miller, J. M.; Gallo, L. C.; Gonzalez, A. G. +1 more
Eclipsing of the X-ray emitting region in active galactic nuclei (AGN) is a potentially powerful probe to examine the AGN environment and absorber properties. Here, we study the eclipse data from the 2016 XMM-Newton observation of NGC 6814 using a colour-colour analysis. Colours (i.e. hardness ratios) can provide the advantage of better time resol…
Light and colour of cirrus, translucent, and opaque dust in the high-latitude area of LDN 1642
Haas, M.; Väisänen, P.; Lehtinen, K. +2 more
We have performed a 5-colour surface photometric study of the high-galactic-latitude area of dark nebula LDN 1642. Scattered light properties are presented of diffuse, translucent, and opaque dust over the range of 3500-5500 Å . Far infrared absolute photometry at 200 µm improves the precision of and provides a zero point to the extinction. The in…
Peculiar temporal and spectral features in highly obscured HMXB pulsar IGR J16320-4751 using XMM-Newton
Paul, Biswajit; Varun; Iyer, Nirmal
IGR J16320-4751 is a highly obscured HMXB source containing a very slow neutron star (Pspin ∼ 1300 sec) orbiting its supergiant companion star with a period of ∼9 days. It shows high column density (NH ∼ 2 - 5 × 1023cm-2) in the spectrum, and a large variation in flux along the orbit despite not being an…
Study of Central Intensity Ratio of Seyfert Galaxies in Nearby Universe
Ravikumar, C. D.; Aswathy, S.; Vinod, K. T. +1 more
We use the recently discovered simple photometric parameter Central Intensity Ratio (CIR) determined for a sample of 57 nearby (z < 0.02) Seyfert galaxies to explore the central features of galaxies and their possible connection with galaxy evolution. The sample of galaxies shows strong anti-correlation between CIR and mass of their central sup…
TCP J18224935-2408280: a symbiotic star identified during outburst
Sonith, L. S.; Kamath, U. S.
TCP J18224935-2408280 was reported to be in outburst on 2021 May 19. Follow-up spectroscopic observations confirmed that the system was a symbiotic star. We present optical spectra obtained from the Himalayan Chandra Telescope during 2021-22. The early spectra were dominated by Balmer lines, He I lines and high ionization lines such as He II. In t…