Search Publications
Turbulence Sets the Initial Conditions for Star Formation in High-pressure Environments
Testi, L.; Bastian, N.; Bally, J. +9 more
Despite the simplicity of theoretical models of supersonically turbulent, isothermal media, their predictions successfully match the observed gas structure and star formation activity within low-pressure (P/k < 105 K cm-3) molecular clouds in the solar neighborhood. However, it is unknown whether or not these theories exte…
Class 0 Protostars in the Perseus Molecular Cloud: A Correlation Between the Youngest Protostars and the Dense Gas Distribution
Bernard, J. -P.; Hill, T.; White, G. J. +18 more
We use PACS and SPIRE continuum data at 160 µm, 250 µm, 350 µm, and 500 µm from the Herschel Gould Belt Survey to sample seven clumps in Perseus: B1, B1-E, B5, IC 348, L1448, L1455, and NGC 1333. Additionally, we identify and characterize the embedded Class 0 protostars using detections of compact Herschel sources at 70 &mi…
Disk Radii and Grain Sizes in Herschel-resolved Debris Disks
Moór, Attila; Pawellek, Nicole; Ábrahám, Péter +5 more
The radii of debris disks and the sizes of their dust grains are important tracers of the planetesimal formation mechanisms and physical processes operating in these systems. Here we use a representative sample of 34 debris disks resolved in various Herschel Space Observatory (Herschel is an ESA space observatory with science instruments provided …
[C II] and 12CO(1-0) Emission Maps in HLSJ091828.6+514223: A Strongly Lensed Interacting System at z = 5.24
Smail, I.; Kneib, J. -P.; Altieri, B. +25 more
We present Submillimeter Array [C II] 158 µm and Karl G. Jansky Very Large Array 12CO(1-0) line emission maps for the bright, lensed, submillimeter source at z = 5.2430 behind A 773: HLSJ091828.6+514223 (HLS0918). We combine these measurements with previously reported line profiles, including multiple 12CO rotational tr…
How Dead are Dead Galaxies? Mid-infrared Fluxes of Quiescent Galaxies at Redshift 0.3 < z < 2.5: Implications for Star Formation Rates and Dust Heating
Franx, Marijn; Labbé, Ivo; Quadri, Ryan +17 more
We investigate star formation rates (SFRs) of quiescent galaxies at high redshift (0.3 < z < 2.5) using 3D-HST WFC3 grism spectroscopy and Spitzer mid-infrared data. We select quiescent galaxies on the basis of the widely used UVJ color-color criteria. Spectral energy distribution (SED) fitting (rest-frame optical and near-IR) indicates very…
Imaging and Spectroscopic Observations of a Filament Channel and the Implications for the Nature of Counter-streamings
Chen, P. F.; Harra, L. K.; Fang, C.
The dynamics of a filament channel are observed with imaging and spectroscopic telescopes before and during the filament eruption on 2011 January 29. The extreme ultraviolet (EUV) spectral observations reveal that there are no EUV counterparts of the Hα counter-streamings in the filament channel, implying that the ubiquitous Hα counter-streamings …
Intracluster Light at the Frontier: A2744
Trujillo, Ignacio; Montes, Mireia
The ultra-deep multiwavelength Hubble Space Telescope Frontier Fields coverage of the Abell Cluster 2744 is used to derive the stellar population properties of its intracluster light (ICL). The restframe colors of the ICL of this intermediate redshift (z = 0.3064) massive cluster are bluer (g - r = 0.68 ± 0.04; i - J = 0.56 ± 0.01) than those foun…
The Broadband Spectral Variability of MCG-6-30-15 Observed by NuSTAR and XMM-Newton
Harrison, F. A.; Cappi, M.; Guainazzi, M. +19 more
MCG-6-30-15, at a distance of 37 Mpc (z = 0.008), is the archetypical Seyfert 1 galaxy showing very broad Fe Kα emission. We present results from a joint NuSTAR and XMM-Newton observational campaign that, for the first time, allows a sensitive, time-resolved spectral analysis from 0.35 keV up to 80 keV. The strong variability of the source is best…
Confirmation of Circumstellar Phosphine
Teyssier, D.; Cernicharo, J.; Encrenaz, P. +2 more
Phosphine (PH3) was tentatively identified a few years ago in the carbon star envelopes IRC +10216 and CRL 2688 from observations of an emission line at 266.9 GHz attributable to the J = 1-0 rotational transition. We report the detection of the J = 2-1 rotational transition of PH3 in IRC +10216 using the HIFI instrument on bo…
The Albedo-Color Diversity of Transneptunian Objects
Lellouch, Emmanuel; Lacerda, Pedro; Guilbert-Lepoutre, Aurélie +9 more
We analyze albedo data obtained using the Herschel Space Observatory that reveal the existence of two distinct types of surface among midsized trans-Neptunian objects. A color-albedo diagram shows two large clusters of objects, one redder and higher albedo and another darker and more neutrally colored. Crucially, all objects in our sample located …