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CANDELS Sheds Light on the Environmental Quenching of Low-mass Galaxies
Papovich, Casey; Pérez-González, Pablo G.; Santini, Paola +17 more
We investigate the environmental quenching of galaxies, especially those with stellar masses (M *) < 109.5 M ⊙, beyond the local universe. Essentially all local low-mass quenched galaxies (QGs) are believed to live close to massive central galaxies, which is a demonstration of environmental quenching. We use CAN…
A Likely Redback Millisecond Pulsar Counterpart of 3FGL J0838.8-2829
Halpern, J. P.; Strader, J.; Li, M.
We obtained new optical observations of the X-ray source XMMU J083850.38-282756.8, the previously proposed counterpart of the γ-ray source 3FGL J0838.8-2829. Time-series photometry in the r\prime band reveals periodic modulation of ≈ 1 mag that is characteristic of the heating of the photosphere of a low-mass companion star by a compact…
The heterogeneous coma of comet 67P/Churyumov-Gerasimenko as seen by ROSINA: H2O, CO2, and CO from September 2014 to February 2016
Lasue, J.; Wurz, P.; Altwegg, K. +25 more
Context. The ESA Rosetta mission has been investigating the environment of comet 67P/Churyumov-Gerasimenko (67P) since August 2014. Among the experiments on board the spacecraft, the ROSINA experiment (Rosetta Orbiter Spectrometer for Ion and Neutral Analysis) includes two mass spectrometers to analyse the composition of neutrals and ions and a CO…
Extremely late photometry of the nearby SN 2011fe
Spyromilio, J.; Fransson, C.; Jerkstrand, A. +6 more
Type Ia supernovae are widely accepted to be the outcomes of thermonuclear explosions in white dwarf stars. However, many details of these explosions remain uncertain (e.g. the mass, ignition mechanism and flame speed). Theory predicts that at very late times (beyond 1000 d) it might be possible to distinguish between explosion models. Few very ne…
High-energy Variability of PSR J1311-3430
An, Hongjun; Kerr, Matthew; Romani, Roger W. +2 more
We have studied the variability of the black-widow-type binary millisecond pulsar PSR J1311-3430 from optical to gamma-ray energies. We confirm evidence for orbital modulation in the weak off-pulse ≳200 MeV emission, with a peak at {φ }B≈ 0.8, following pulsar inferior conjunction. The peak has a relatively hard spectrum, extending abov…
Explosive Chromospheric Evaporation Driven by Nonthermal Electrons around One Footpoint of a Solar Flare Loop
Huang, Y.; Li, D.; Zhang, Q. M. +1 more
We explore the temporal relationship between microwave/hard X-ray (HXR) emission and Doppler velocity during the impulsive phase of a solar flare on 2014 October 27 (SOL2014-10-27) that displays a pulse on the light curves in the microwave (34 GHz) and HXR (25-50 keV) bands before the flare maximum. Imaging observation shows that this pulse mainly…
ALMA Observations of a Quiescent Molecular Cloud in the Large Magellanic Cloud
Rosolowsky, Erik; Hughes, Annie; Bernard, Jean-Philippe +19 more
We present high-resolution (subparsec) observations of a giant molecular cloud in the nearest star-forming galaxy, the Large Magellanic Cloud. ALMA Band 6 observations trace the bulk of the molecular gas in 12CO(2-1) and the high column density regions in 13CO(2-1). Our target is a quiescent cloud (PGCC G282.98-32.40, which w…
Interannual and seasonal changes in the south seasonal polar cap of Mars: Observations from MY 28-31 using MARCI
James, P. B.; Cantor, B. A.; Calvin, W. M.
The Mars Color Imager (MARCI) camera on the Mars Reconnaissance Orbiter provides daily synoptic coverage that allows monitoring of seasonal cap retreat and interannual changes that occur between Mars Years (MY) and over the southern summer. We present the first analysis of this data for the southern seasonal cap evolution observed in MY 28, 29, 30…
Quantifying the (X/peanut)-shaped structure of the Milky Way - new constraints on the bar geometry
Ciambur, Bogdan C.; Bland-Hawthorn, Joss; Graham, Alister W.
The nature, size and orientation of the Milky Way's bar and `bulge' have been the subject of conflicting interpretations in the literature. Here, we present a novel approach to inferring the properties of the long bar, which extends beyond the inner `bulge', by using information encoded in the Galaxy's X/peanut (X/P)-shaped structure. We perform a…
The β Pictoris association: Catalog of photometric rotational periods of low-mass members and candidate members
Messina, S.; Medhi, B. J.; Zhang, L. +19 more
Aims: We intended to compile the most complete catalog of bona fide members and candidate members of the β Pictoris association, and to measure their rotation periods and basic properties from our own observations, public archives, and exploring the literature.
Methods: We carried out a multi-observatories campaign to get our own photome…