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Overdensity of SMGs in fields containing z ∼ 0.3 galaxies: magnification bias and the implications for studies of galaxy evolution
Bonavera, L.; Dunne, L.; Maddox, S. J. +2 more
We report a remarkable overdensity of high-redshift submillimetre galaxies (SMG), 4-7 times the background, around a statistically complete sample of twelve 250 µm selected galaxies at z = 0.35, which were targeted by ALMA in a study of gas tracers. This overdensity is consistent with the effect of lensing by the haloes hosting the target z …
Relation of Coronal Rain Originating from Coronal Condensations to Interchange Magnetic Reconnection
Peter, Hardi; Li, Leping; Chitta, Lakshmi Pradeep +1 more
Using extreme-ultraviolet images, we recently proposed a new and alternative formation mechanism for coronal rain along magnetically open field lines due to interchange magnetic reconnection. In this paper we report coronal rain at chromospheric and transition region temperatures originating from the coronal condensations facilitated by reconnecti…
A Compton-thick nucleus in the dual active galactic nuclei of Mrk 266
Inami, H.; Iwasawa, K.; Charmandaris, V. +6 more
We present the results from our analysis of NuSTAR data of the luminous infrared galaxy Mrk 266, which contains two nuclei, south-western (SW) and north-eastern (NE), which were resolved in previous Chandra imaging. Combining this with the Chandra data, we intepret the hard X-ray spectrum obtained from a NuSTAR observation to result from a steeply…
Thermal inertias of pebble-pile comet 67P/Churyumov-Gerasimenko
Ohno, Kazumasa; Arakawa, Sota
The Rosetta mission to comet 67P/Churyumov-Gerasimenko has provided new data to better understand what comets are made of. The weak tensile strength of the cometary surface materials suggests that the comet is a hierarchical dust aggregate formed through gravitational collapse of a bound clump of small dust aggregates so-called 'pebbles' in the ga…
Discovery of Tidal Tails around the Old Open Cluster NGC 2506
Gao, Xinhua
We report the discovery of tidal tails around the old open cluster NGC 2506 based on Gaia-DR2. A principal-component analysis and Gaussian mixture model are used to identify extra-tidal stars. We identify 2301 stars closely related to the cluster, 147 of which are likely extra-tidal stars. We find clear evidence for the existence of two well-defin…
When the disc's away, the stars will play: dynamical masses in the nova-like variable KR Aur with a pinch of accretion
Gänsicke, B. T.; Koester, D.; Toloza, O. +8 more
We obtained time-resolved optical photometry and spectroscopy of the nova-like variable KR Aurigae in the low state. The spectrum reveals a DAB white dwarf (WD) and a mid-M dwarf companion. Using the companion star's i-band ellipsoidal modulation we refine the binary orbital period to be P = 3.906519 ± 0.000001 h. The light curve and the spectra s…
Eclipsing Binaries in the Open Cluster Ruprecht 147. III. The Triple System EPIC 219552514 at the Main-sequence Turnoff
Torres, Guillermo; Vanderburg, Andrew; Rizzuto, Aaron C. +3 more
Spectroscopic observations are reported for the 2.75 day, double-lined, detached eclipsing binary EPIC 219552514 located at the turnoff of the old nearby open cluster Ruprecht 147. A joint analysis of our radial-velocity measurements and the K2 light curve leads to masses of ${M}_{1}={1.509}_{-0.056}^{+0.063}\,{M}_{\odot }$ and ${M}_{2}={0.649}_{-…
Water megamaser emission in hard X-ray selected AGN
Ubertini, P.; Malizia, A.; Bassani, L. +4 more
Context. Water megamaser emission at 22 GHz has proven to be a powerful tool for astrophysical studies of active galactic nuclei (AGN) because it allows an accurate determination of the mass of the central black hole and of the accretion disc geometry and dynamics. However, after searches among thousands of galaxies, only about 200 of them have sh…
OGLE-ing the Magellanic System: Cepheids in the Bridge
Udalski, Andrzej; Mróz, Przemek; Szymański, Michał K. +12 more
We present a detailed analysis of the Magellanic Bridge Cepheid sample constructed using the Optical Gravitational Lensing Experiment Collection of Variable Stars. Our updated Bridge sample contains 10 classical and 13 anomalous Cepheids. We calculate their individual distances using optical period-Wesenheit relations and construct three-dimension…
Measuring the Heating and Cooling of the Interstellar Medium at High Redshift: PAH and [C II] Observations of the Same Star-forming Galaxies at z ∼ 2
Kirkpatrick, Allison; Dickinson, Mark E.; McKinney, Jed +4 more
Star formation depends critically on cooling mechanisms in the interstellar medium (ISM); however, thermal properties of gas in galaxies at the peak epoch of star formation (z ∼ 2) remain poorly understood. A limiting factor in understanding the multiphase ISM is the lack of multiple tracers detected in the same galaxies, such as Polycyclic Aromat…