Search Publications
On the Origin of the 11.3 Micron Unidentified Infrared Emission Feature
Zhang, Yong; Kwok, Sun; Sadjadi, SeyedAbdolreza
The 11.3 µm emission feature is a prominent member of the family of unidentified infrared emission (UIE) bands and is frequently attributed to out-of-plane bending modes of polycyclic aromatic hydrocarbon (PAH) molecules. We have performed quantum mechanical calculations of 60 neutral PAH molecules and found that it is difficult to reconcile…
The Metal-enriched Thermal Composite Supernova Remnant Kesteven 41 (G337.8-0.1) in a Molecular Environment
Zhou, Ping; Su, Yang; Zhou, Xin +3 more
The physical nature of thermal composite supernova remnants (SNRs) remains controversial. We have revisited the archival XMM-Newton and Chandra data of the thermal composite SNR Kesteven 41 (Kes 41 or G337.8-0.1) and performed a millimeter observation toward this source in the 12CO, 13CO, and C18O lines. The X-ray …
Evaluating the Morphology of the Local Interstellar Medium: Using New Data to Distinguish between Multiple Discrete Clouds and a Continuous Medium
Redfield, Seth; Linsky, Jeffrey L.
Ultraviolet and optical spectra of interstellar gas along the lines of sight to nearby stars have been interpreted by Redfield & Linsky and previous studies as a set of discrete warm, partially ionized clouds each with a different flow vector, temperature, and metal depletion. Recently, Gry & Jenkins proposed a fundamentally different mode…
First Infrared-Based Implications for the Dust Attenuation and Star Formation of Typical Lyα Emitters
Ouchi, Masami; Shimasaku, Kazuhiro; Nakajima, Kimihiko +1 more
By stacking publicly available deep Spitzer/MIPS 24 µm and Herschel/PACS images for 213 z≃ 2.18 Lyα Emitters (LAEs) in GOODS-South, we obtain a strong upper limit to the IR luminosity of typical LAEs and discuss their attenuation curve for the first time. The 3σ upper limit LTIR3σ = 1.1× {{10}10} {{L}⊙ …
The Absolute Age of the Globular Cluster M15 Using Near-infrared Adaptive Optics Images from PISCES/LBT.
Boutsia, K.; Massari, D.; Arcidiacono, C. +26 more
We present deep near-infrared J, {K}{{s}} photometry of the old, metal-poor Galactic globular cluster M15 obtained with images collected with the LUCI1 and PISCES cameras available at the Large Binocular Telescope (LBT). We show how the use of First Light Adaptive Optics (FLAO) system coupled with the PISCES camera allows us to improve …
AKARI Observation of the Sub-degree Scale Fluctuation of the Near-infrared Background
Lee, Hyung Mok; Lee, Myung Gyoon; Jeong, W. -S. +3 more
We report spatial fluctuation analysis of the sky brightness in the near-infrared from observations toward the north ecliptic pole (NEP) by the AKARI at 2.4 and 3.2 µm. As a follow-up study of our previous work on the Monitor field of AKARI, we used NEP deep survey data, which covered a circular area of about 0.4 square degrees, in order to …
Interstellar Flow Longitude from the Symmetry of the Pickup Ion Cut-off at 1 AU
Möbius, E.; Lee, M. A.; Drews, C.
We provide a proof of concept that the pickup ion (PUI) cutoff speed variation with ecliptic longitude can provide the interstellar neutral (ISN) flow longitude {λ }{ISN∞ } outside the heliosphere with a precision of the order of 0.°1. We compare 2007-2014 STEREO A PLASTIC observations in the solar wind frame with a simple analytical cu…
Autoclassification of the Variable 3XMM Sources Using the Random Forest Machine Learning Algorithm
Farrell, Sean A.; Murphy, Tara; Lo, Kitty K.
In the current era of large surveys and massive data sets, autoclassification of astrophysical sources using intelligent algorithms is becoming increasingly important. In this paper we present the catalog of variable sources in the Third XMM-Newton Serendipitous Source catalog (3XMM) autoclassified using the Random Forest machine learning algorith…
Weather on Other Worlds. III. A Survey for T Dwarfs with High-amplitude Optical Variability
Metchev, Stanimir; Heinze, Aren N.; Kellogg, Kendra
We have monitored 12 T dwarfs with the Kitt Peak 2.1 m telescope using an F814W filter (0.7-0.95 µm) to place in context the remarkable 10%-20% variability exhibited by the nearby T dwarf Luhman 16B in this wavelength regime. The motivation was the poorly known red optical behavior of T dwarfs, which have been monitored almost exclusively at…
New Constraints on Cosmic Polarization Rotation from the ACTPol Cosmic Microwave Background B-mode Polarization Observation and the BICEP2 Constraint Update
di Serego Alighieri, Sperello; Xu, Lixin; Mei, Hsien-Hao +2 more
Recently, ACTPol measured the cosmic microwave background (CMB) B-mode and E-mode polarizations and obtained TE, EE, BB, TB, and EB power spectra in the multipole range 225-8725. In our previous paper (Paper I), we jointly analyzed the results of three experiments on the CMB B-mode polarization—SPTpol, POLARBEAR, and BICEP2—to include in the model…