Search Publications
Dissecting the High-z Interstellar Medium through Intensity Mapping Cross-correlations
Lagache, Guilaine; Doré, Olivier; Serra, Paolo
We explore the detection, with upcoming spectroscopic surveys, of three-dimensional power spectra of emission line fluctuations produced in different phases of the interstellar medium (ISM) by forbidden transitions of ionized carbon [C II] (157.7 µm), ionized nitrogen [N II] (121.9 and 205.2 µm), and neutral oxygen [O I] (145.5 µ…
The Orion HII Region and the Orion Bar in the Mid-infrared
Tielens, A. G. G. M.; Berné, O.; Herter, T. L. +3 more
We present mid-infrared photometry of the Orion bar obtained with the Faint Object infraRed Camera for the SOFIA Telescope (FORCAST) on board SOFIA at 6.4, 6.6, 7.7, 19.7, 31.5, and 37.1 µm. By complementing this observation with archival FORCAST and Herschel/PACS images, we are able to construct a complete infrared spectral energy distribut…
The [NII] 205 µm Emission in Local Luminous Infrared Galaxies
Gao, Yu; Lu, Nanyao; Zhao, Yinghe +9 more
In this paper, we present the measurements of the [N II] 205 µm line for a flux-limited sample of 122 (ultra-)luminous infrared galaxies [(U)LIRGs] and 20 additional normal galaxies, obtained with the Herschel Space Observatory (Herschel). We explore the far-infrared (FIR) color dependence of the [N II] 205 µm (L[N II]205 µm…
The Infrared Spectral Properties of Magellanic Carbon Stars
van Loon, J. Th.; Sahai, R.; Wood, P. R. +12 more
The Infrared Spectrograph on the Spitzer Space Telescope observed 184 carbon stars in the Magellanic Clouds. This sample reveals that the dust-production rate (DPR) from carbon stars generally increases with the pulsation period of the star. The composition of the dust grains follows two condensation sequences, with more SiC condensing before amor…
Dust and Polycyclic Aromatic Hydrocarbon in the Pre-transitional Disk around HD 169142
Seok, Ji Yeon; Li, Aigen
The pre-transitional disk around the Herbig Ae star HD 169142 shows a complex structure of possible ongoing planet formation in dust thermal emission from the near-infrared (IR) to millimeter wavelength range. Also, a distinct set of broad emission features at 3.3, 6.2, 7.7, 8.6, 11.3, and 12.7 µ {{m}}, commonly attributed to polycyclic arom…
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…
The 6 µm Feature As a Tracer of Aliphatic Components of Interstellar Carbonaceous Grains
Zhang, Yong; Kwok, Sun; Hsia, Chih-Hao +1 more
An unidentified infrared emission (UIE) feature at 6.0 µm is detected in a number of astronomical sources showing the UIE bands. In contrast to the previous suggestion that this band is due to C=O vibrational modes, we suggest that the 6.0 µm feature arises from olefinic double-bond functional groups. These groups are likely to be atta…
On the Relation between the Mysterious 21 µm Emission Feature of Post-asymptotic Giant Branch Stars and Their Mass-loss Rates
Li, Aigen; Jiang, B. W.; Mishra, Ajay
Over two decades ago, a prominent, mysterious emission band peaking at ∼20.1 µm was serendipitously detected in four preplanetary nebulae (PPNe; also known as “protoplanetary nebulae”). To date, this spectral feature, designated as the “21 µm” feature, has been seen in 27 carbon-rich PPNe in the Milky Way and the Magellanic Clouds. The…
A Model for the Dust Envelope of the Silicate Carbon Star IRAS 09425-6040
Suh, Kyung-Won
IRAS 09425-6040 (I09425) is a silicate carbon star with conspicuous crystalline silicate and water-ice features and emission excesses in the far-infrared and millimeter (mm) wavelength ranges. To understand properties of the dust envelope of I09425, we propose a physical model based on the observations and known properties of asymptotic giant bran…