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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…
Exploring the Overabundance of ULXs in Metal- and Dust-poor Local Lyman Break Analogs
Zezas, Andreas; Hornschemeier, Ann; Ptak, Andy +4 more
We have studied high-mass X-ray binary (HMXB) populations within two low-metallicity, starburst galaxies, Haro 11 and VV 114. These galaxies serve as analogs to high-redshift (z\gt 2) Lyman break galaxies and, within the larger sample of Lyman break analogs (LBAs), they are sufficiently nearby (<87 Mpc) to be spatially resolved by Chandra. Prev…
Surface Temperatures on Titan during Northern Winter and Spring
Flasar, F. M.; Coustenis, A.; Achterberg, R. K. +9 more
Meridional brightness temperatures were measured on the surface of Titan during the 2004-2014 portion of the Cassini mission by the Composite Infrared Spectrometer. Temperatures mapped from pole to pole during five two-year periods show a marked seasonal dependence. The surface temperature near the south pole over this time decreased by 2 K from 9…
Fe Line Diagnostics of Cataclysmic Variables and Galactic Ridge X-Ray Emission
Wang, Q. Daniel; Li, Xiang-Dong; Xu, Xiao-jie
The properties of the Galactic Ridge X-ray Emission (GRXE) observed in the 2-10 keV band place fundamental constraints on various types of X-ray sources in the Milky Way. Although the primarily discrete origin of the emission is now well established, the responsible populations of these sources remain uncertain, especially at relatively low fluxes…
Probing the Outskirts of the Early-Stage Galaxy Cluster Merger A1750
Sarazin, Craig L.; Bayliss, Matthew; Andrade-Santos, Felipe +12 more
We present results from recent Suzaku and Chandra X-ray and Multiple Mirrior Telescope optical observations of the strongly merging “double cluster” A1750 out to its virial radius, both along and perpendicular to a putative large-scale structure filament. Some previous studies of individual clusters have found evidence for ICM entropy profiles tha…
On the Composition of Young, Directly Imaged Giant Planets
Fortney, J. J.; Zahnle, K.; Moses, J. I. +6 more
The past decade has seen significant progress on the direct detection and characterization of young, self-luminous giant planets at wide orbital separations from their host stars. Some of these planets show evidence for disequilibrium processes like transport-induced quenching in their atmospheres; photochemistry may also be important, despite the…
The Contribution of Host Galaxies to the Infrared Energy Output of z ≳ 5.0 Quasars
Lyu, Jianwei; Alberts, Stacey; Rieke, G. H.
The infrared spectral energy distributions of z ≳ 5 quasars can be reproduced by combining a low-metallicity galaxy template with a standard active galactic nucleus (AGN) template. The host galaxy is represented by Haro 11, a compact, moderately low metallicity, starbursting galaxy that shares typical features of high-z galaxies. For the vast majo…
The Ellipticity Distribution of Ambiguously Blended Objects
Dawson, William A.; Tyson, J. Anthony; Schneider, Michael D. +1 more
Using overlapping fields with space-based Hubble Space Telescope and ground-based Subaru Telescope imaging we identify a population of blended galaxies that are blended to such a large degree that they are detected as single objects in the ground-based monochromatic imaging, which we label “ambiguous blends.” For deep imaging data, such as the dep…
The Structure of the Circumgalactic Medium of Galaxies: Cool Accretion Inflow Around NGC 1097
Frye, Brenda L.; Bowen, David V.; Tripp, Todd M. +4 more
We present Hubble Space Telescope far-UV spectra of four QSOs whose sightlines pass through the halo of NGC 1097 at impact parameters of ρ = 48-165 kpc. NGC 1097 is a nearby spiral galaxy that has undergone at least two minor merger events, but no apparent major mergers, and is relatively isolated with respect to other nearby bright galaxies. This…