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A Candidate Planetary-mass Object with a Photoevaporating Disk in Orion
Fang, Min; Pascucci, Ilaria; Apai, Dániel +2 more
In this work, we report the discovery of a candidate planetary-mass object with a photoevaporating protoplanetary disk, Proplyd 133-353, which is near the massive star θ 1 Ori C at the center of the Orion Nebula Cluster (ONC). The object was known to have extended emission pointing away from θ 1 Ori C, indicating ongoing exte…
Spaced-based search coil magnetometers
Hospodarsky, George B.
Search coil magnetometers are one of the primary tools used to study the magnetic component of low-frequency electromagnetic waves in space. Their relatively small size, mass, and power consumption, coupled with a good frequency range and sensitivity, make them ideal for spaceflight applications. The basic design of a search coil magnetometer cons…
Evidence from SOFIA Imaging of Polycyclic Aromatic Hydrocarbon Formation along a Recent Outflow in NGC 7027
Sahai, R.; Ressler, M. E.; Lau, R. M. +1 more
We report spatially resolved (FWHM ∼ 3.″8-4.″6) mid-IR imaging observations of the planetary nebula (PN) NGC 7027 taken with the 2.5 m telescope on board the Stratospheric Observatory for Infrared Astronomy (SOFIA). Images of NGC 7027 were acquired at 6.3, 6.6, 11.1, 19.7, 24.2, 33.6, and 37.1 µ {{m}} using the Faint Object Infrared Camera f…
Observational aspects of galactic accretion at redshift 3.3
Rauch, Michael; Haehnelt, Martin G.; Becker, George D.
We investigate the origin of extragalactic continuum emission and its relation to the stellar population of a recently discovered peculiar z = 3.344 Ly α emitter. Based on an analysis of the broad-band colours and morphology, we find further support for the idea that the underlying galaxy is being fed by a large-scale (L ≥ 35 kpc) accretion stream…
Observations of asymmetric velocity fields and gas cooling in the NGC 4636 galaxy group X-ray halo
Kaastra, Jelle; Finoguenov, Alexis; Fabian, Andrew +4 more
Aims: This study aims to probe the thermodynamic properties of the hot intragroup medium (IGM) plasma in the core regions of the NGC 4636 galaxy group by detailed measurements of several emission lines and their relative intensities.
Methods: We analyzed deep XMM-Newton Reflection Grating Spectrometer (RGS) data in five adjacent spectral…
Compact E+A Galaxies as a Progenitor of Massive Compact Quiescent Galaxies at 0.2 < z < 0.8
Hwang, Ho Seong; Geller, Margaret J.; Damjanov, Ivana +5 more
We search the Sloan Digital Sky Survey and the Baryon Oscillation Sky Survey to identify ∼5500 massive compact quiescent galaxy candidates at 0.2 < z < 0.8. We robustly classify a subsample of 438 E+A galaxies based on their spectral properties and make this catalog publicly available. We examine sizes, stellar population ages, and kinematic…
Symbiotic Stars in X-Rays. III. Suzaku Observations
Nuñez, N. E.; Nelson, T.; Mukai, K. +2 more
We describe the X-ray emission as observed by Suzaku from five symbiotic stars that we selected for deep Suzaku observations after their initial detection with ROSAT, ASCA, and Swift. We find that the X-ray spectra of all five sources can be adequately fit with absorbed optically thin thermal plasma models, with either single- or multi-temperature…
The utility of polarized heliospheric imaging for space weather monitoring
Webb, D. F.; Davies, J. A.; DeForest, C. E. +1 more
A polarizing heliospheric imager is a critical next generation tool for space weather monitoring and prediction. Heliospheric imagers can track coronal mass ejections (CMEs) as they cross the solar system, using sunlight scattered by electrons in the CME. This tracking has been demonstrated to improve the forecasting of impact probability and arri…
Accretion disc/corona emission from a radio-loud narrow-line Seyfert 1 galaxy PKS 0558-504
Dewangan, G. C.; Ghosh, R.; Raychaudhuri, B.
Approximately 10-20 per cent of active galactic nuclei (AGN) are known to eject powerful jets from the innermost regions. There is very little observational evidence if the jets are powered by spinning black holes and if the accretion discs extend to the innermost regions in radio-loud AGN. Here, we study the soft X-ray excess, the hard X-ray spec…
Comparing Dark Energy Survey and HST-CLASH observations of the galaxy cluster RXC J2248.7-4431: implications for stellar mass versus dark matter
Benoit-Lévy, A.; D'Andrea, C. B.; Abbott, T. M. C. +66 more
We derive the stellar mass fraction in the galaxy cluster RXC J2248.7-4431 observed with the Dark Energy Survey (DES) during the Science Verification period. We compare the stellar mass results from DES (five filters) with those from the Hubble Space Telescope Cluster Lensing And Supernova Survey (CLASH; 17 filters). When the cluster spectroscopic…