Search Publications
The Survey of Lines in M31 (SLIM): The Drivers of the [C II]/TIR Variation
Schinnerer, Eva; Groves, Brent; Glover, Simon +7 more
The ratio of the [C II] 158 µ {{m}} emission line over the total infrared emission (TIR) is often used as a proxy for the photoelectric (PE) heating efficiency ({ɛ }{PE}) of the far-ultraviolet (FUV) photons absorbed by dust in the interstellar medium. In the nearby galaxy M31, we measure a strong radial variation of [C II]/TIR th…
Red Supergiants in the Inner Galaxy: Stellar Properties
Menten, Karl M.; Zhu, Qingfeng; Kudritzki, Rolf-Peter +4 more
Red supergiants (RSGs) are luminous cool stars detectable in disks of distant spirals. About a thousand are known in the Galaxy. Here, we analyze a sample of late-type stars recently observed by Messineo et al. in the inner Galaxy (10^\circ < l< 60^\circ ). A total of 58 targets (25% of previously known RSGs) were reported as supergiants bas…
CO Spectral Line Energy Distributions in Galactic Sources: Empirical Interpretation of Extragalactic Observations
Schilke, P.; Lis, D. C.; Bergin, E. A. +5 more
The relative populations in rotational transitions of CO can be useful for inferring gas conditions and excitation mechanisms at work in the interstellar medium. We present CO emission lines from rotational transitions observed with Herschel/HIFI in the star-forming cores Orion S, Orion KL, Sgr B2(M), and W49N. Integrated line fluxes from these ob…
The Panchromatic Hubble Andromeda Treasury. XVII. Examining Obscured Star Formation with Synthetic Ultraviolet Flux Maps in M31.
Bell, Eric F.; Dolphin, Andrew E.; Skillman, Evan D. +10 more
We present synthetic far- and near-ultraviolet ({FUV} and {NUV}) maps of M31, both with and without dust reddening. These maps were constructed from spatially resolved star formation histories (SFHs) derived from optical Hubble Space Telescope imaging of resolved stars, taken as part of the Panchromatic Hubble Andromeda Treasury program. We use st…
Understanding the Links among the Magnetic Fields, Filament, Bipolar Bubble, and Star Formation in RCW 57A Using NIR Polarimetry
Tamura, M.; Nishiyama, S.; Wang, Jia-Wei +10 more
The influence of magnetic fields (B-fields) on the formation and evolution of bipolar bubbles, due to the expanding ionization fronts (I-fronts) driven by the H II regions that are formed and embedded in filamentary molecular clouds, has not been well-studied yet. In addition to the anisotropic expansion of I-fronts into a filament, B-fields are e…
Finite-frequency Sensitivity Kernels in Spherical Geometry for Time-Distance Helioseismology
Mandal, Krishnendu; Hanasoge, Shravan M.; Bhattacharya, Jishnu +1 more
The inference of internal properties of the Sun from surface measurements of wave travel times is the goal of time-distance helioseismology. A critical step toward the accurate interpretation of shifts in travel time is the computation of sensitivity functions linking seismic measurements to internal structure. Here we calculate finite-frequency s…
Recombining Plasma and Gamma-Ray Emission in the Mixed-morphology Supernova Remnant 3C 400.2
Fukui, Y.; Sano, H.; Sezer, A. +2 more
3C 400.2 belongs to the mixed-morphology supernova remnant class, showing center-filled X-ray and shell-like radio morphology. We present a study of 3C 400.2 with archival Suzaku and Fermi-LAT observations. We find recombining plasma (RP) in the Suzaku spectra of north-east and south-east regions. The spectra of these regions are well described by…
Sunward-propagating Solar Energetic Electrons inside Multiple Interplanetary Flux Ropes
Temmer, Manuela; Veronig, Astrid; Dresing, Nina +8 more
On 2013 December 2 and 3, the SEPT and STE instruments on board STEREO-A observed two solar energetic electron events with unusual sunward-directed fluxes. Both events occurred during a time interval showing typical signatures of interplanetary coronal mass ejections (ICMEs). The electron timing and anisotropies, combined with extreme-ultraviolet …
Stacked Average Far-infrared Spectrum of Dusty Star-forming Galaxies from the Herschel/SPIRE Fourier Transform Spectrometer
Pearson, Chris; Clements, David L.; Valtchanov, Ivan +13 more
We present stacked average far-infrared spectra of a sample of 197 dusty star-forming galaxies (DSFGs) at 0.005< z< 4 using about 90% of the Herschel Space Observatory SPIRE Fourier Transform Spectrometer (FTS) extragalactic data archive based on 3.5 years of science operations. These spectra explore an observed-frame 447-1568 GHz frequency …
Detection of Extraplanar Diffuse Ionized Gas in M83
Gallagher, J. S., III; Boettcher, Erin; Zweibel, Ellen G.
We present the first kinematic study of extraplanar diffuse ionized gas (eDIG) in the nearby, face-on disk galaxy M83 using optical emission-line spectroscopy from the Robert Stobie Spectrograph on the Southern African Large Telescope. We use a Markov Chain Monte Carlo method to decompose the [N II]λ λ 6548, 6583, Hα, and [S II]λ λ 6717, 6731 emis…