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Distance, magnetic field, and kinematics of the filamentary cloud LDN 1157
Tej, Anandmayee; Soam, Archana; Kim, Shinyoung +7 more
Context. LDN 1157 is one of several clouds that are situated in the cloud complex LDN 1147/1158. The cloud presents a coma-shaped morphology with a well-collimated bipolar outflow emanating from a Class 0 protostar, LDN 1157-mm, that resides deep inside the cloud.
Aims: The main goals of this work are (a) mapping the intercloud magnetic field…
The globular cluster M10: reassessment of stellar membership, distance, and age using its variable and HB stars
Arellano Ferro, A.; Calderón, J. H.; Muneer, S. +4 more
Time-series VI CCD photometry of the globular cluster M10 (NGC 6254) is employed to perform a detailed identification, inspection of their light curves, their classification, and their cluster membership, of all the known variables reported up to 2018. The membership analysis is based on the $Gaia$ -DR2 positions and proper motions. The metallicit…
Soft X-Ray Observations of Quiescent Solar Active Regions Using the Novel Dual-zone Aperture X-Ray Solar Spectrometer
Woods, Thomas N.; Caspi, Amir; Mason, James Paul +3 more
The Dual-zone Aperture X-ray Solar Spectrometer (DAXSS) was flown on 2018 June 18 on the NASA 36.336 sounding rocket flight and obtained the highest resolution to date for solar soft X-ray (SXR) spectra over a broad energy range. This observation was during a time with quiescent (nonflaring) small active regions on the solar disk and when the 10.7…
Massive Star Formation in the Ultraviolet Observed with the Hubble Space Telescope
Leitherer, Claus
Spectroscopic observations of a massive star formation in the ultraviolet and their interpretation are reviewed. After a brief historical retrospective, two well-studied resolved star clusters and the surrounding H II regions are introduced: NGC 2070 in the Large Magellanic Cloud and NGC 604 in M33. These regions serve as a training set for studie…
The cosmic-ray content of the Orion-Eridanus superbubble
Casandjian, J. M.; Grenier, I. A.; Schlickeiser, R. +2 more
Aims: The nearby Orion-Eridanus superbubble, which was blown by multiple supernovae several million years ago, has likely produced cosmic rays. Its turbulent medium is still energised by massive stellar winds and it can impact cosmic-ray transport locally. The γ radiation produced in interactions between cosmic rays and interstellar gas can b…
The properties of radio and mid-infrared detected galaxies and the effect of environment on the co-evolution of AGN and star formation at z ∼ 1
Shen, Lu; Wu, Po-Feng; Fassnacht, Christopher D. +10 more
In this study, we investigate 179 radio-infrared (IR) galaxies drawn from a sample of spectroscopically confirmed galaxies, which are detected in radio and mid-IR (MIR) in the redshift range of 0.55 ≤ z ≤ 1.30 in the Observations of Redshift Evolution in Large Scale Environments (ORELSE) survey. We constrain the active galactic nuclei (AGN) contri…
The population of rotational fission clusters inside asteroid collisional families
Spoto, F.; Carruba, V.; Aljbaae, S. +3 more
Asteroid families are groups of objects sharing similar orbits. They are mostly the results of past collisions between two asteroids. Recent studies have shown that some asteroid families can also be the outcome of the spin-up-induced fission of a critically rotating parent body (fission clusters). In at least four young fission clusters, more tha…
Identification of 3XMM J000511.8+634018 as a new polar at Porb = 133.5 min - is it inside or outside the period gap?
Webb, N. A.; Guillot, S.; Schwope, A. D. +2 more
Aims: We aimed to identify the variable X-ray source 3XMM J000511.8+634018, which was serendipitously discovered through routine inspections while the 3XMM catalogue was compiled.
Methods: We analysed the archival XMM-Newton observation of the source, obtained BUSCA photometry in three colours, and performed optical spectroscopy with the…
Distance mapping applied to four well-known planetary nebulae and a nova shell
Gonçalves, Denise R.; Akras, Stavros; Steffen, Wolfgang +1 more
Accurate distance estimates of astrophysical objects such as planetary nebulae (PNe), and nova and supernova remnants, among others, allow us to constrain their physical characteristics, such as size, mass, luminosity, and age. An innovative technique based on the expansion parallax method, the so-called distance mapping technique (DMT), provides …
A complex storm system in Saturn's north polar atmosphere in 2018
Hueso, R.; Sánchez-Lavega, A.; Simon, A. A. +15 more
Saturn's convective storms usually fall in two categories. One consists of mid-sized storms ∼2,000 km wide, appearing as irregular bright cloud systems that evolve rapidly, on scales of a few days. The other includes the Great White Spots, planetary-scale giant storms ten times larger than the mid-sized ones, which disturb a full latitude band, en…