Search Publications
First Science Observations with SOFIA/FORCAST: Properties of Intermediate-luminosity Protostars and Circumstellar Disks in OMC-2
Morris, Mark R.; Fischer, William J.; Calvet, Nuria +18 more
We examine eight young stellar objects in the OMC-2 star-forming region based on observations from the SOFIA/FORCAST early science phase, the Spitzer Space Telescope, the Herschel Space Observatory, Two Micron All Sky Survey, Atacama Pathfinder Experiment, and other results in the literature. We show the spectral energy distributions (SED) of thes…
Correlations in the (Sub)millimeter Background from ACT × BLAST
Hilton, Matt; Hasselfield, Matthew; Bond, J. Richard +43 more
We present measurements of the auto- and cross-frequency correlation power spectra of the cosmic (sub)millimeter background at 250, 350, and 500 µm (1200, 860, and 600 GHz) from observations made with the Balloon-borne Large Aperture Submillimeter Telescope (BLAST); and at 1380 and 2030 µm (218 and 148 GHz) from observations made with …
Extreme Star Formation in the Host Galaxies of the Fastest Growing Supermassive Black Holes at z = 4.8
Trakhtenbrot, Benny; Netzer, Hagai; Shemmer, Ohad +2 more
We report new Herschel observations of 25 z ~= 4.8 extremely luminous optically selected active galactic nuclei (AGNs). Five of the sources have extremely large star-forming (SF) luminosities, L SF, corresponding to SF rates (SFRs) of 2800-5600 M ⊙ yr-1 assuming a Salpeter initial mass function. The remaining sourc…
Cosmic Evolution of Star Formation Enhancement in Close Major-merger Galaxy Pairs Since z = 1
Berta, S.; Magnelli, B.; Lutz, D. +22 more
The infrared (IR) emission of "M * galaxies" (1010.4 <= M star <= 1011.0 M ⊙) in galaxy pairs, derived using data obtained in Herschel (PEP/HerMES) and Spitzer (S-COSMOS) surveys, is compared to that of single-disk galaxies in well-matched control samples to study the cosmic evolution of…
Thirty Years of SN 1980K: Evidence for Light Echoes
Barlow, Michael J.; Meixner, Margaret; Clayton, Geoffrey C. +7 more
We report optical and mid-infrared photometry of SN 1980K between 2004 and 2010, which shows slow monotonic fading consistent with previous spectroscopic and photometric observations made 8-17 yr after outburst. The slow rate of change over two decades suggests that this evolution may result from scattered and thermal light echoes off of extended …
The Latitude Distribution of Small-scale Magnetic Elements in Solar Cycle 23
Wang, J. X.; Jin, C. L.
With the unique data set from full-disk observations provided by Michelson Doppler Imager on board the Solar and Heliospheric Observatory in the interval embodying solar cycle 23, we have found that the cyclic variations of numbers and total flux of these small-scale magnetic elements covering fluxes of (2.9-32.0) × 1018 Mx and (4.27-38…
Recovery of the Historical SN1957D in X-Rays with Chandra
Soria, Roberto; Blair, William P.; Whitmore, Bradley C. +6 more
SN1957D, located in one of the spiral arms of M83, is one of the small number of extragalactic supernovae (SNe) that has remained detectable at radio and optical wavelengths during the decades after its explosion. Here, we report the first detection of SN1957D in X-rays, as part of a 729 ks observation of M83 with Chandra. The X-ray luminosity (0.…
The Truncated Disk from Suzaku Data of GX 339-4 in the Extreme Very High State
Done, Chris; Ueda, Yoshihiro; Kubota, Aya +4 more
We report on the geometry of accretion disk and high-energy coronae in the strong Comptonization state (the very high/steep power law/hard intermediate state) based on a Suzaku observation of the famous Galactic black hole GX 339-4. These data were taken just before the peak of the 2006-2007 outburst, and the average X-ray luminosity in the 0.7-20…
Extreme Host Galaxy Growth in Powerful Early-epoch Radio Galaxies
Haas, Martin; Barthel, Peter; Wilkes, Belinda +1 more
During the first half of the universe's life, a heyday of star formation must have occurred because many massive galaxies are in place after that epoch in cosmic history. Our observations with the revolutionary Herschel Space Observatory reveal vigorous optically obscured star formation in the ultra-massive hosts of many powerful high-redshift 3C …
Chandra and HST Imaging of the Quasars PKS B0106+013 and 3C 345: Inverse Compton X-Rays and Magnetized Jets
Marshall, H. L.; Kharb, P.; Lister, M. L. +1 more
We present results from deep (~70 ks) Chandra/ACIS observations and Hubble Space Telescope (HST) Advanced Camera for Surveys F475W observations of two highly optically polarized quasars belonging to the MOJAVE blazar sample, viz., PKS B0106+013 and 1641+399 (3C 345). These observations reveal X-ray and optical emissions from the jets in both sourc…