Updated Design of the CMB Polarization Experiment Satellite LiteBIRD

JOURNAL OF LOW TEMPERATURE PHYSICS Springer Science and Business Media LLC 199:3-4 (2020) 1107-1117

Authors:

H Sugai, Par Ade, Y Akiba, D Alonso, K Arnold, J Aumont, J Austermann, C Baccigalupi, Aj Banday, R Banerji, Rb Barreiro, S Basak, J Beall, S Beckman, M Bersanelli, J Borrill, F Boulanger, Ml Brown, M Bucher, A Buzzelli, E Calabrese, Fj Casas, A Challinor, J-F Cliche, F Columbro

Abstract:

© 2020, The Author(s). Recent developments of transition-edge sensors (TESs), based on extensive experience in ground-based experiments, have been making the sensor techniques mature enough for their application on future satellite cosmic microwave background (CMB) polarization experiments. LiteBIRD is in the most advanced phase among such future satellites, targeting its launch in Japanese Fiscal Year 2027 (2027FY) with JAXA’s H3 rocket. It will accommodate more than 4000 TESs in focal planes of reflective low-frequency and refractive medium-and-high-frequency telescopes in order to detect a signature imprinted on the CMB by the primordial gravitational waves predicted in cosmic inflation. The total wide frequency coverage between 34 and 448 GHz enables us to extract such weak spiral polarization patterns through the precise subtraction of our Galaxy’s foreground emission by using spectral differences among CMB and foreground signals. Telescopes are cooled down to 5 K for suppressing thermal noise and contain polarization modulators with transmissive half-wave plates at individual apertures for separating sky polarization signals from artificial polarization and for mitigating from instrumental 1/f noise. Passive cooling by using V-grooves supports active cooling with mechanical coolers as well as adiabatic demagnetization refrigerators. Sky observations from the second Sun–Earth Lagrangian point, L2, are planned for 3 years. An international collaboration between Japan, the USA, Canada, and Europe is sharing various roles. In May 2019, the Institute of Space and Astronautical Science, JAXA, selected LiteBIRD as the strategic large mission No. 2.

Search for Magnetic Monopoles and Stable High-Electric-Charge Objects in 13 Tev Proton-Proton Collisions with the ATLAS Detector

Physical Review Letters American Physical Society (APS) 124:3 (2020) 031802

Authors:

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Yamazaki, Z Yan, HJ Yang, HT Yang, S Yang, X Yang, Y Yang, W-M Yao, YC Yap, Y Yasu, E Yatsenko, J Ye, S Ye, I Yeletskikh, MR Yexley, E Yigitbasi, K Yorita, K Yoshihara, CJS Young, C Young, J Yu, R Yuan, X Yue, SPY Yuen, B Zabinski, G Zacharis, E Zaffaroni, J Zahreddine, AM Zaitsev, T Zakareishvili, N Zakharchuk, S Zambito, D Zanzi, DR Zaripovas, SV Zeißner, C Zeitnitz, G Zemaityte, JC Zeng, O Zenin, D Zerwas, M Zgubič, DF Zhang, F Zhang, G Zhang, G Zhang, H Zhang, J Zhang, L Zhang, L Zhang, M Zhang, R Zhang, R Zhang, X Zhang, Y Zhang, Z Zhang, Z Zhang, P Zhao, Y Zhao, Z Zhao, A Zhemchugov, Z Zheng, D Zhong, B Zhou, C Zhou, MS Zhou, M Zhou, N Zhou, Y Zhou, CG Zhu, HL Zhu, H Zhu, J Zhu, Y Zhu, X Zhuang, K Zhukov, V Zhulanov, D Zieminska, NI Zimine, S Zimmermann, Z Zinonos, M Ziolkowski, G Zobernig, A Zoccoli, K Zoch, TG Zorbas, R Zou, L Zwalinski

A spectroscopic, photometric, polarimetric and radio study of the eclipsing polar UZ Fornacis: the first simultaneous SALT and MeerKAT observations

(2020)

Authors:

Zwidofhelangani N Khangale, Stephen B Potter, Patrick A Woudt, David AH Buckley, Andrey N Semena, Enrico J Kotze, Danièl N Groenewald, Dante M Hewitt, Margaretha L Pretorius, Rob P Fender, Paul Groot, Steven Bloemen, Marc Klein-Wolt, Elmar Körding, Rudolf Le Poole, Vanessa A McBride, Lee Townsend, Kerry Paterson, Danielle LA Pieterse, Paul M Vreeswijk

The optically-selected 1.4-GHz quasar luminosity function below 1 mJy

Monthly Notices of the Royal Astronomical Society Oxford University Press 492:4 (2020) 5297-5312

Authors:

Eliab Malefahlo, Mario G Santos, Matthew Jarvis, Sarah V White, Jonathan TL Zwart

Abstract:

We present the radio luminosity function (RLF) of optically selected quasars below 1 mJy, constructed by applying a Bayesian-fitting stacking technique to objects well below the nominal radio flux density limit. We test the technique using simulated data, confirming that we can reconstruct the RLF over three orders of magnitude below the typical 5σ detection threshold. We apply our method to 1.4-GHz flux densities from the Faint Images of the Radio Sky at Twenty-Centimeters (FIRST) survey, extracted at the positions of optical quasars from the Sloan Digital Sky Survey over seven redshift bins up to z = 2.15, and measure the RLF down to two orders of magnitude below the FIRST detection threshold. In the lowest redshift bin (0.2 < z < 0.45), we find that our measured RLF agrees well with deeper data from the literature. The RLF for the radio-loud quasars flattens below log10[L1.4/WHz−1]≈25.5 and becomes steeper again below log10[L1.4/WHz−1]≈24.8⁠, where radio-quiet quasars start to emerge. The radio luminosity where radio-quiet quasars emerge coincides with the luminosity where star-forming galaxies are expected to start dominating the radio source counts. This implies that there could be a significant contribution from star formation in the host galaxies, but additional data are required to investigate this further. The higher redshift bins show a similar behaviour to the lowest z bin, implying that the same physical process may be responsible.

Molecular gas inflows and outflows in ultraluminous infrared galaxies at z similar to 0.2 and one QSO at z=6.1

Astronomy and Astrophysics EDP Sciences 633 (2020) L4

Authors:

R Herrera-Camus, E Sturm, J Gracia-Carpio, S Veilleux, T Shimizu, D Lutz, M Stone, E Gonzalez-Alfonso, R Davies, J Fischer, R Genzel, R Maiolino, A Sternberg, L Tacconi, Aprajita Verma

Abstract:

Aims: Our aim is to search for and characterize inflows and outflows of molecular gas in four ultraluminous infrared galaxies (ULIRGs; LIR >  1012L⊙) at z ∼ 0.2−0.3 and one distant quasi-stellar object (QSO) at z = 6.13.

Methods: We used Herschel/PACS and ALMA Band 7 observations of the hydroxyl molecule (OH) line at rest-frame wavelength 119 μm, which in absorption can provide unambiguous evidence of inflows or outflows of molecular gas in nuclear regions of galaxies. Our study contributes to doubling the number of OH 119 μm observations of luminous systems at z ∼ 0.2−0.3, and pushes the search for molecular outflows based on the OH 119 μm transition to z ∼ 6.

Results: We detect OH 119 μm high-velocity absorption wings in three of the four ULIRGs. In two cases, IRAS F20036−1547 and IRAS F13352+6402, the blueshifted absorption profiles indicate the presence of powerful and fast (∼200−500 km s−1) molecular gas outflows. Consistent with an inside-out quenching scenario, these outflows are depleting the central reservoir of star-forming molecular gas at a rate similar to that of intense star formation activity. For the starburst-dominated system IRAS 10091+4704, we detect an inverted P Cygni profile that is unique among ULIRGs and indicates the presence of a fast (∼400 km s−1) inflow of molecular gas at a rate of ∼100 M⊙ yr−1 towards the central region. Finally, we tentatively detect (∼3σ) the OH 119 μm doublet in absorption in the z = 6.13 QSO ULAS J131911+095051. The OH 119 μm feature is blueshifted with a median velocity that suggests the presence of a molecular outflow, although characterized by a modest molecular mass loss rate of ∼200 M⊙ yr−1. This value is comparable to the small mass outflow rates found in the stacking of the [C II] spectra of other z ∼ 6 QSOs and suggests that ejective feedback in this phase of the evolution of ULAS J131911+095051 has subsided.