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THE AzTEC/SMA INTERFEROMETRIC IMAGING SURVEY OF SUBMILLIMETER-SELECTED HIGH-REDSHIFT GALAXIES
Younger, Joshua D.,Fazio, Giovanni G.,Huang, Jia-Sheng,Yun, Min S.,Wilson, Grant W.,Ashby, Matthew L. N.,Gurwell, Mark A.,Peck, Alison B.,Petitpas, Glen R.,Wilner, David J.,Hughes, David H.,Aretxaga, IOP Publishing 2009 The Astrophysical journal Vol.704 No.1
<P>We present results from a continuing interferometric survey of high-redshift submillimeter galaxies (SMGs) with the Submillimeter Array, including high-resolution (beam size similar to 2 arcsec) imaging of eight additional AzTEC 1.1 mm selected sources in the COSMOS field, for which we obtain six reliable (peak signal-to-noise ratio (S/N) > 5 or peak S/N > 4 with multiwavelength counterparts within the beam) and two moderate significance (peak S/N > 4) detections. When combined with previous detections, this yields an unbiased sample of millimeter-selected SMGs with complete interferometric follow up. With this sample in hand, we (1) empirically confirm the radio-submillimeter association, (2) examine the submillimeter morphology-including the nature of SMGs with multiple radio counterparts and constraints on the physical scale of the far infrared-of the sample, and (3) find additional evidence for a population of extremely luminous, radio-dim SMGs that peaks at higher redshift than previous, radio-selected samples. In particular, the presence of such a population of high-redshift sources has important consequences for models of galaxy formation-which struggle to account for such objects even under liberal assumptions-and dust production models given the limited time since the big bang.</P>
Exploring the Variability of the Flat-spectrum Radio Source 1633+382. II. Physical Properties
Algaba, Juan-Carlos,Lee, Sang-Sung,Rani, Bindu,Kim, Dae-Won,Kino, Motoki,Hodgson, Jeffrey,Zhao, Guang-Yao,Byun, Do-Young,Gurwell, Mark,Kang, Sin-Cheol,Kim, Jae-Young,Kim, Jeong-Sook,Kim, Soon-Wook,Par American Astronomical Society 2018 The Astrophysical journal Vol.859 No.2
<P>The flat-spectrum radio quasar 1633+382 (4C 38.41) showed a significant increase of its radio flux density during the period 2012 March-2015 August, which correlates with gamma-ray flaring activity. Multi-frequency simultaneous very long baseline interferometry (VLBI) observations were conducted as part of the interferometric monitoring of gamma-ray bright active galactic nuclei (iMOGABA) program and supplemented with additional radio monitoring observations with the OVRO 40. m telescope, the Boston University VLBI program, and the Submillimeter Array. The epochs of the maxima for the two largest gamma-ray flares coincide with the ejection of two respective new VLBI components. Analysis of the spectral energy distribution indicates a higher turnover frequency after the flaring events. The evolution of the flare in the turnover frequency-turnover flux density plane probes the adiabatic losses in agreement with the shock-in-jet model. The derived synchrotron self-absorption magnetic fields, of the order of 0.1. mG, do not seem to change dramatically during the flares, and are much weaker, by a factor 10(4), than the estimated equipartition magnetic fields, indicating that the source of the flare may be associated with a particle-dominated emitting region.</P>
Algaba, Juan-Carlos,Lee, Sang-Sung,Kim, Dae-Won,Rani, Bindu,Hodgson, Jeffrey,Kino, Motoki,Trippe, Sascha,Park, Jong-Ho,Zhao, Guang-Yao,Byun, Do-Young,Gurwell, Mark,Kang, Sin-Cheol,Kim, Jae-Young,Kim, American Astronomical Society 2018 The Astrophysical Journal Vol.852 No.1
<P>We present multi-frequency simultaneous VLBI radio observations of the flat spectrum radio quasar 1633+382 (4C 38.41) as part of the interferometric monitoring of gamma-ray-bright active galactic nuclei (iMOGABA) program combined with additional observations in the radio, optical, X-rays, and gamma-rays carried out during the period 2012 March-2015 August. The monitoring of this source reveals a significant long-lived increase in its activity for approximately two years in the radio bands, which correlates with a similar increase in all other bands from submillimeter to gamma-rays. A significant correlation is also found between radio fluxes and simultaneous spectral indices during this period. The study of the discrete correlation function indicates time lags smaller than the uncertainties of similar to 40 days among both radio bands and high-energy bands, and a time lag of similar to 70 days, with gamma-rays leading radio emission. We interpret this as showing that the high-energy and radio fluxes arise from different emitting regions, located at 1 +/- 13 and 40 +/- 13 pc from the central engine respectively.</P>