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The orbital phase space of contracted dark matter haloes
Grand, Robert J. J.; Marinacci, Federico; Deason, Alis J. +4 more
We study the orbital phase space of dark matter (DM) haloes in the AURIGA suite of cosmological hydrodynamics simulations of Milky Way (MW) analogues. We characterize haloes by their spherical action distribution, $F\left(J_{{r}},L\right)$ , a function of the specific angular momentum, L, and the radial action, Jr, of the DM particles. …
Formation pathway for lonely stripped-envelope supernova progenitors: implications for Cassiopeia A
Sato, Toshiki; Podsiadlowski, Philipp; Mandel, Ilya +2 more
We explore a new scenario for producing stripped-envelope supernova progenitors. In our scenario, the stripped-envelope supernova is the second supernova of the binary, in which the envelope of the secondary was removed during its red supergiant phase by the impact of the first supernova. Through 2D hydrodynamical simulations, we find that ∼50-90 …
Efficient Methanol Production on the Dark Side of a Prestellar Core
Bizzocchi, Luca; Caselli, Paola; Rosolowsky, Erik +23 more
We present Atacama Large Millimeter/submillimeter Array maps of the starless molecular cloud core Ophiuchus/H-MM1 in the lines of deuterated ammonia (ortho- ${\mathrm{NH}}_{2}{\rm{D}}$ ), methanol ( ${\mathrm{CH}}_{3}\mathrm{OH}$ ), and sulfur monoxide (SO). The dense core is seen in ${\mathrm{NH}}_{2}{\rm{D}}$ emission, whereas the ${\mathrm{CH}}…
A catalogue of over 10 million variable source candidates in ZTF Data Release 1
Gal-Yam, Avishay; Ofek, Eran O.; Masci, Frank +4 more
Variable sources probe a wide range of astrophysical phenomena. We present a catalogue of over 10 million variable source candidates found in Data Release 1 (DR1) of the Zwicky Transient Facility (ZTF). We perform a periodicity search up to a frequency of 160 d-1, and we classify the light curves into erratic and smooth variables. We al…
LAMOST Observations in 15 K2 Campaigns. I. Low-resolution Spectra from LAMOST DR6
Shi, Jianrong; Zong, Weikai; Fu, Jian-Ning +12 more
The Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST)-K2 (LK2) project, initiated in 2015, aims to collect low-resolution spectra of targets in the K2 campaigns, similar to the LAMOST-Kepler project. By the end of 2018, a total of 126 LK2 plates had been observed by LAMOST. After cross-matching the catalog of the LAMOST data relea…
Estimating the size of X-ray lamppost coronae in active galactic nuclei
Done, C.; Petrucci, P. -O.; Matt, G. +3 more
Aims: We report estimates of the X-ray coronal size of active galactic nuclei in the lamppost geometry. In this commonly adopted scenario, the corona is assumed for simplicity to be a point-like X-ray source located on the axis of the accretion disc. However, the corona must intercept a number of optical/UV seed photons from the disc consiste…
MOSEL: Strong [OIII] 5007 Å Emitting Galaxies at (3 < z < 4) from the ZFOURGE Survey
Papovich, Casey; Kacprzak, Glenn G.; Glazebrook, Karl +13 more
To understand how strong emission-line galaxies (SELGs) contribute to the overall growth of galaxies and star formation history of the universe, we target SELGs from the ZFOURGE imaging survey that have blended Hβ+[O III] rest-frame equivalent widths of >230 Å and 2.5 < ${z}_{\mathrm{phot}}$ < 4.0. Using Keck/MOSFIRE, we measure 49 redshi…
Zodiacal exoplanets in time - XI. The orbit and radiation environment of the young M dwarf-hosted planet K2-25b
Kuzuhara, M.; Tamura, M.; Kudo, T. +20 more
M dwarf stars are high-priority targets for searches for Earth-size and potentially Earth-like planets, but their planetary systems may form and evolve in very different circumstellar environments than those of solar-type stars. To explore the evolution of these systems, we obtained transit spectroscopy and photometry of the Neptune-size planet or…
Possible ∼0.4 h X-ray quasi-periodicity from an ultrasoft active galactic nucleus
Xue, Y. Q.; Shu, X. W.; Wang, T. G. +6 more
RX J1301.9+2747 is an ultrasoft active galactic nucleus (AGN) with unusual X-ray variability that is characterized by a long quiescent state and a short-lived flare state. The X-ray flares are found to recur quasi-periodically on a timescale of 13-20 ks. Here, we report the analysis of the light curve in the quiescent state from two XMM-Newton obs…
The Blue Compact Dwarf Galaxy VCC 848 Formed by Dwarf-Dwarf Merging: H I Gas, Star Formation, and Numerical Simulations
Gao, Yu; Rong, Yu; Hunter, Deidre A. +12 more
A clear link between a dwarf-dwarf merger event and enhanced star formation (SF) in the recent past was recently identified in the gas-dominated merger remnant VCC 848, offering by far the clearest view of a gas-rich late-stage dwarf-dwarf merger. We present a joint analysis of JVLA H I emission line mapping, optical imaging, and numerical simulat…