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Deuterated polycyclic aromatic hydrocarbons: Revisited
Tielens, A. G. G. M.; Mori, T.; Onaka, T. +2 more
Aims: The amount of deuterium locked up in polycyclic aromatic hydrocarbons (PAHs) has to date been an uncertain value. We present a near-infrared (NIR) spectroscopic survey of Hii regions in the Milky Way, Large Magellanic Cloud, and Small Magellanic Cloud obtained with AKARI, which aims to search for features indicative of deuterated PAHs (…
VLT/ISAAC infrared spectroscopy of embedded high-mass YSOs in the Large Magellanic Cloud: Methanol and the 3.47 µm band
Boulanger, F.; Onaka, T.; Dartois, E. +1 more
Aims: This study aims to elucidate a possible link between chemical properties of ices in star-forming regions and environmental characteristics (particularly metallicity) of the host galaxy. The Large Magellanic Cloud (LMC) is an excellent target to study properties of interstellar and circumstellar medium in a different galactic environment…
Silicate Composition of the Interstellar Medium
Watson, D. M.; Sargent, B. A.; Fogerty, S. +2 more
The composition of silicate dust in the diffuse interstellar medium and in protoplanetary disks around young stars informs our understanding of the processing and evolution of the dust grains leading up to planet formation. An analysis of the well-known 9.7 µm feature indicates that small amorphous silicate grains represent a significant fra…
Optical and near-infrared observations of SN 2014ck: an outlier among the Type Iax supernovae
Howell, D. A.; Kankare, E.; Turatto, M. +18 more
We present a comprehensive set of optical and near-infrared (NIR) photometric and spectroscopic observations for SN 2014ck, extending from pre-maximum to six months later. These data indicate that SN 2014ck is photometrically nearly identical to SN 2002cx, which is the prototype of the class of peculiar transients named SNe Iax. Similar to SN 2002…
The Rhythm of Fairall 9. I. Observing the Spectral Variability with XMM-Newton and NuSTAR
Harrison, F. A.; Stern, D.; Zhang, W. W. +13 more
We present a multi-epoch X-ray spectral analysis of the Seyfert 1 galaxy Fairall 9. Our analysis shows that Fairall 9 displays unique spectral variability in that its ratio residuals to a simple absorbed power law in the 0.5-10 keV band remain constant with time in spite of large variations in flux. This behavior implies an unchanging source geome…
Multispacecraft observations and modeling of the 22/23 June 2015 geomagnetic storm
Russell, C. T.; Anderson, B. J.; Nakamura, R. +9 more
The magnetic storm of 22-23 June 2015 was one of the largest in the current solar cycle. We present in situ observations from the Magnetospheric Multiscale Mission (MMS) and the Van Allen Probes (VAP) in the magnetotail, field-aligned currents from AMPERE (Active Magnetosphere and Planetary Electrodynamics Response), and ionospheric flow data from…
Recurring X-ray outbursts in the supernova impostor SN 2010da in NGC 300
Skillman, E. D.; Kong, A. K. H.; Williams, B. F. +4 more
We present new observations of the `supernova impostor' SN 2010da using the Chandra X-ray Observatory and the Hubble Space Telescope. During the initial 2010 outburst, the 0.3-10 keV luminosity was observed by Swift to be ∼5 × 1038 erg s-1 and faded by a factor of ∼25 in a four month period. Our two new Chandra observations s…
Multi-wavelength Study of the Supernova Remnant Kes 79 (G33.6+0.1): On Its Supernova Properties and Expansion into a Molecular Environment
Safi-Harb, Samar; Zhou, Ping; Zhang, Zhi-Yu +4 more
Kes 79 (G33.6+0.1) is an aspherical thermal composite supernova remnant (SNR) observed across the electromagnetic spectrum and showing an unusual highly structured morphology, in addition to harboring a central compact object (CCO). Using the CO J = 1-0, J = 2-1, and J = 3-2 data, we provide the first direct evidence and new morphological evidence…
Optical and NIR observations of the nearby type Ia supernova SN 2014J
Ojha, D. K.; Anupama, G. C.; Prabhu, T. P. +4 more
Optical and NIR observations of the Type Ia supernova SN 2014J in M82 are presented. The observed light curves are found to be similar to normal Type Ia supernovae (SNe Ia), with a decline rate parameter Δm15(B) = 1.08 ± 0.03. The supernova reached B-band maximum on JD 2456690.14, at an apparent magnitude mB(max) = 11.94. The…
Galaxy Candidates at z ~ 10 in Archival Data from the Brightest of Reionizing Galaxies (BORG[z8]) Survey
Treu, T.; Mason, C. A.; Trenti, M. +9 more
The Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST) enabled the search for the first galaxies observed at z ∼ 8-11 (500-700 Myr after the Big Bang). To continue quantifying the number density of the most luminous galaxies (M AB ∼ -22.0) at the earliest epoch observable with HST, we search for z ∼ 10 galaxies (F125W-drop…