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Line-of-sight extrapolation noise in dust polarization
Dodelson, Scott; Poh, Jason
The B-modes of polarization at frequencies ranging from 50-1000 GHz are produced by Galactic dust, lensing of primordial E-modes in the cosmic microwave background (CMB) by intervening large scale structure, and possibly by primordial B-modes in the CMB imprinted by gravitational waves produced during inflation. The conventional method used to sep…
Searching for intermediate-mass black holes in galaxies with low-luminosity AGN: a multiple-method approach
Ciambur, Bogdan C.; Graham, Alister W.; Mutlu-Pakdil, Burçin +7 more
Aims: This work is the first stage of a campaign to search for intermediate-mass black holes (IMBHs) in low-luminosity active galactic nuclei (LLAGN) and dwarf galaxies. An additional and equally important aim of this pilot study is to investigate the consistency between the predictions of several popular black hole scaling relations and the …
BL Lacertae: X-ray spectral evolution and a black-hole mass estimate
Titarchuk, Lev; Seifina, Elena
We present an analysis of the spectral properties observed in X-rays from active galactic nucleus BL Lacertae using RXTE, Suzaku, ASCA, BeppoSAX, and Swift observations. The total time covered by these observations is approximately 20 yr. We show strong observational evidence that this source undergoes X-ray spectral transitions from the low hard …
Localized recombining plasma in G166.0+4.3: A supernova remnant with an unusual morphology
Uchida, Hiroyuki; Nobukawa, Masayoshi; Tsuru, Takeshi Go +4 more
We observed the Galactic mixed-morphology supernova remnant G166.0+4.3 with Suzaku. The X-ray spectrum in the western part of the remnant is well represented by a one-component ionizing plasma model. The spectrum in the northeastern region can be explained by two components. One is an Fe-rich component with electron temperature kT_e = 0.87_{-0.03}…
Constraining holographic cosmology using Planck data
Afshordi, Niayesh; Gould, Elizabeth; Skenderis, Kostas
Holographic cosmology offers a novel framework for describing the very early Universe in which cosmological predictions are expressed in terms of the observables of a three-dimensional quantum field theory (QFT). This framework includes conventional slow-roll inflation, which is described in terms of a strongly coupled QFT, but it also allows for …
Multi-wavelength Spectral Analysis of Ellerman Bombs Observed by FISS and IRIS
Cao, Wenda; Ding, M. D.; Hong, Jie
Ellerman bombs (EBs) are a kind of solar activity that is suggested to occur in the lower solar atmosphere. Recent observations using the Interface Region Imaging Spectrograph (IRIS) show connections between EBs and IRIS bombs (IBs), which imply that EBs might be heated to a much higher temperature (8 × 104 K) than previous results. Her…
Absolute-magnitude Calibration for W UMa-type Systems Based on Gaia Data
Rucinski, Slavek M.; Mateo, Nicole M.
Tycho-Gaia Astrometric Solution (TGAS) parallax data are used to determine absolute magnitudes M V for 318 W UMa-type (EW) contact binary stars. A very steep (slope ≃ -9), single-parameter ({log}P), linear calibration can be used to predict M V to about 0.1-0.3 mag over the whole range of accessible orbital period, 0.22&l…
Observational Constraints on Correlated Star Formation and Active Galactic Nuclei in Late-stage Galaxy Mergers
Zakamska, Nadia L.; Comerford, Julia M.; Barrows, R. Scott +1 more
Galaxy mergers are capable of triggering both star formation and active galactic nuclei (AGNs) and therefore may represent an important pathway in the co-evolution of galaxies and supermassive black holes (SMBHs). However, correlated enhancements of merger-induced star formation and AGN triggering may be hidden by the variable conditions and times…
Draining the Local Void
Shaya, Edward J.; Tully, R. Brent; Karachentsev, Igor D. +2 more
Two galaxies that lie deep within the Local Void provide a test of the expectation that voids expand. The modest ({M}B∼ -14) HI bearing dwarf galaxies ALFAZOAJ1952+1428 and KK246 have been imaged with Hubble Space Telescope in order to study the stellar populations and determine distances from the luminosities of stars at the tip of the…
A Nearly Naked Supermassive Black Hole
Darling, Jeremy; Petrov, L.; Condon, J. J. +1 more
During a systematic search for supermassive black holes (SMBHs) not in galactic nuclei, we identified the compact, symmetric radio source B3 1715+425 with an emission-line galaxy offset ≈ 8.5 {kpc} from the nucleus of the brightest cluster galaxy (BCG) in the redshift z = 0.1754 cluster ZwCl 8193. B3 1715+425 is too bright (brightness temperature …