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Dissecting the Global Cold Dust Properties and Possible Submillimeter Excess of 13 Nearby Spiral Galaxies from the NGLS
Wilson, Christine D.; Li, Dalei; Tang, Xindi +9 more
We select 13 nearby spiral galaxies from the Nearby Galaxies Legacy Survey (NGLS) project and perform spectral energy distribution fitting for each galaxy applying two-component modified blackbody models on a global scale aim to probe the potential submillimeter (submm) excess. We find that NGC 2976, NGC 3351, and NGC 4631 show excess emission at …
Lithological mapping of Eratosthenes crater region using Moon Mineralogy Mapper of Chandrayaan-1
Kumaresan, P. R.; Saravanavel, J.; Palanivel, K.
Selenological exploration (lunar geology) involves mapping and delineation of different rock types and minerals present in the Moon. Various lunar missions with multi-spectral sensors provided preliminary information about the lithological and mineralogical occurrences on the Moon. The Chandrayaan-1 Moon Mineralogy Mapper (M3), provided…
Magnetic Rayleigh-Taylor Instability in an Experiment Simulating a Solar Loop
Zhang, Yang; Wongwaitayakornkul, Pakorn; Bellan, Paul M.
A hoop force driven magnetic Rayleigh-Taylor instability (MRTI) is observed in a laboratory experiment that simulates a solar coronal loop. Increase of the axial wavelength λ is observed when the axial magnetic field increases. This scaling is consistent with the theoretical MRTI growth rate ${\gamma }^{2}={gk}-2{\left({\boldsymbol{k}}\cdot {{\bol…
A Simple Unified Spectroscopic Indicator of Stellar Luminosity: The Extended Flux-weighted Gravity-Luminosity Relationship
Rix, Hans-Walter; Kudritzki, Rolf-Peter; Urbaneja, Miguel A.
We show that for a wide range of stellar masses, from 0.3 to 20 M⊙, and for evolutionary phases from the main sequence to the beginning of the red giant stage, the stellar flux-weighted gravity, gF ≅ g/ ${T}_{\mathrm{eff}}^{4}$ , is tightly correlated with absolute bolometric magnitude ${M}_{\mathrm{bol}}$ . Such a correlatio…
Very fast variations of SiO maser emission in evolved stars
Alcolea, J.; Bujarrabal, V.; de Vicente, P. +3 more
Context. Stars on the asymptotic giant branch (AGB) are long-period variables that present strong flux variations at almost all wavelengths, including the SiO maser lines. The periods of these variations are of 300-500 days in Mira-type stars and somewhat shorter in semi-regular variables. The variability of the SiO lines on short timescales has b…
Distribution of Water Vapor in Molecular Clouds. II
Bergin, Edwin A.; González-Alfonso, Eduardo; Tolls, Volker +8 more
The depth-dependent abundance of both gas-phase and solid-state water within dense, quiescent, molecular clouds is important to both the cloud chemistry and gas cooling. Where water is in the gas phase, it is free to participate in the network of ion-neutral reactions that lead to a host of oxygen-bearing molecules, and its many ortho- and para-en…
The ULX source X-3 in NGC 4258: a search for its X-ray and optical properties
Balman, S.; Akyuz, A.; Aksaker, N. +3 more
We present the results of a search for the nature of ultraluminous X-ray source (ULX) X-3 in the nearby galaxy NGC 4258. We use archival data from XMM-Newton, Chandra, NuSTAR, and Hubble Space Telescope (HST) observations. Total X-ray data were analysed to find that the model parameters of the system are indicative of a stellar-mass black hole, ∼1…
Gas-dust correlations in nearby galaxies: a case study of NGC 3184 and NGC 7793
Saikia, Gautam; Roy, Nirupam; Patra, Narendra Nath +1 more
The study of gas-dust interactions occurring in the interstellar medium of a galaxy is essential for understanding various physical processes taking place within it. A comparison of such events at different locations corresponding to diverse astrophysical environments provides more insight into the star formation as well as dust destruction condit…
Space, time and velocity association of successive coronal mass ejections
Gopalswamy, Nat; Yashiro, Seiji; Lara, Alejandro +2 more
Aims: Our aim is to investigate the possible physical association between consecutive coronal mass ejections (CMEs).
Methods: Through a statistical study of the main characteristics of 27 761 CMEs observed by SOHO/LASCO during the past 20 years.
Results: We found the waiting time (WT) or time elapsed between two consecutive CMEs is …
Hot Gas in Galaxy Halos Traced by Coronal Broad Lyα Absorbers
Richter, Philipp
We explore the possibility to systematically study the extended, hot gaseous halos of low-redshift galaxies with coronal broad Lyα absorbers (CBLAs). These are weak, thermally broadenend H I absorption lines arising from the tiny fraction of neutral hydrogen that resides in the collisionally ionized, million-degree halo gas in these galaxies. Usin…