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Updated X-ray view of the Hyades cluster
Schmitt, J. H. M. M.; Robrade, J.; Schneider, P. C. +1 more
Aims: We revisit the X-ray properties of the main sequence Hyades members and the relation between X-ray emission and stellar rotation.
Methods: As an input catalog for Hyades members, we combined three recent Hyades membership lists derived from Gaia DR2 data that include the Hyades core and its tidal tails. We searched for X-ray detect…
Molecular Gas Outflow in the Starburst Galaxy NGC 1482
Salak, Dragan; Nakai, Naomasa; Miyamoto, Yusuke +1 more
Galactic winds are essential to the regulation of star formation in galaxies. To study the distribution and dynamics of molecular gas in wind, we imaged the nearby starburst galaxy NGC 1482 in CO (J = 1 → 0) at a resolution of 1″ (≈100 pc) using the Atacama Large Millimeter/submillimeter Array. Molecular gas is detected in a nearly edge-on disk wi…
Characterizing the Circumgalactic Medium of the Lowest-mass Galaxies: A Case Study of IC 1613
Putman, Mary E.; Kirby, Evan N.; Werk, Jessica K. +3 more
Using 10 sight lines observed with the Hubble Space Telescope/Cosmic Origins Spectrograph, we study the circumgalactic medium (CGM) and outflows of IC 1613, which is a low-mass (M* ∼ 108 M⊙), dwarf irregular galaxy on the outskirts of the Local Group. Among the sight lines, four are pointed toward UV-bright stars i…
Confirmation of Enhanced Long-wavelength Dust Emission in OMC 2/3
Friesen, Rachel; Sadavoy, Sarah; Mroczkowski, Tony +8 more
Previous continuum observations from the MUSTANG camera on the Green Bank Telescope (GBT) of the nearby star-forming filament OMC 2/3 found elevated emission at 3.3 mm relative to shorter-wavelength data. As a consequence, the inferred dust emissivity index obtained from modified blackbody dust spectra was considerably lower than what is typically…
CO in the C1 globule of the Helix nebula with ALMA
Avison, A.; Zijlstra, A.; Andriantsaralaza, M.
We present and analyse 12CO, 13CO, and C18O(2-1) ALMA observations of the C1 globule inside the Helix nebula in order to determine its physical properties. Our findings confirm the molecular nature of the globule with a multipeak structure. The 12CO line has a high optical depth τ ∼10. The derived 1…
The Isotropic Interplanetary Dust Cloud and Near-infrared Extragalactic Background Light Observed with COBE/DIRBE
Matsuura, S.; Sano, K.; Yomo, K. +1 more
We report observation of isotropic interplanetary dust (IPD) by analyzing the infrared (IR) maps of the Diffuse Infrared Background Experiment (DIRBE) on board the Cosmic Background Explorer (COBE) spacecraft. To search for the isotropic IPD, we perform new analysis in terms of the solar elongation angle (ɛ), because we expect the zodiacal light (…
A new look at Sco OB1 association with Gaia DR2
Costa, E.; Carraro, G.; Yalyalieva, L. +3 more
We present and discuss photometric optical data in the area of the OB association Sco OB1 covering about 1 deg2. UBVI photometry is employed in tandem with Gaia DR2 data to investigate the three-dimensional structure and the star formation history of the region. By combining parallaxes and proper motions, we identify seven physical grou…
CFHT MegaPrime/MegaCam u-band source catalogue of the AKARI North Ecliptic Pole Wide field
Hashimoto, Tetsuya; Goto, Tomotsugu; Kim, Seong Jin +10 more
The $AKARI$ infrared (IR) space telescope conducted two surveys (Deep and Wide) in the North Ecliptic Pole (NEP) field to find more than 100 000 IR sources using its infrared camera (IRC). IRC's nine filters, which cover wavebands from 2 to 24 µm continuously, make $AKARI$ unique in comparison with other IR observatories such as $Spitzer$ or…
RELICS: A Very Large (θE ∼ 40″) Cluster Lens—RXC J0032.1+1808
Ouchi, Masami; Mahler, Guillaume; Bradač, Maruša +38 more
Extensive surveys with the Hubble Space Telescope over the past decade, targeting some of the most massive clusters in the sky, have uncovered dozens of galaxy cluster strong lenses. The massive cluster strong-lens scale is typically θE ∼ 10″ to ∼30″-35″, with only a handful of clusters known with Einstein radii θE ∼ 40″ or a…
Upper Limits on Planet Occurrence around Ultracool Dwarfs with K2
Muirhead, Philip S.; Sagear, Sheila A.; Skinner, Julie N.
The occurrence of planets orbiting ultracool dwarfs is poorly constrained. We present results from a guest observer program on NASA's K2 spacecraft to search for transiting planets orbiting a sample of 827 ultracool dwarfs. Having found no transiting planets in our sample, we determined an upper limit on the occurrence of planets. We simulated pla…