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The H I Content of the Universe Over the Past 10 GYRS
Prochaska, J. Xavier; Rafelski, Marc; Neeleman, Marcel +4 more
We use the Hubble Space Telescope (HST) archive of ultraviolet (UV) quasar spectroscopy to conduct the first blind survey for damped Lyα absorbers (DLAs) at low redshift (z\lt 1.6). Our statistical sample includes 463 quasars with spectral coverage spanning a total redshift path {{Δ }}z=123.3 or an absorption path {{Δ }}X=229.7. Within this survey…
A deep XMM-Newton study of the hot gaseous halo around NGC 1961
Bregman, Joel N.; Churazov, Eugene; Anderson, Michael E.
We examine 11 XMM-Newton observations of the giant spiral galaxy NGC 1961, allowing us to study the hot gaseous halo of a spiral galaxy in unprecedented detail. We perform a spatial and a spectral analysis; with the former, the hot halo is detected to at least 80 kpc and with the latter its properties can be measured in detail up to 42 kpc. We fin…
AGN are cooler than you think: the intrinsic far-IR emission from QSOs
Oliver, S. J.; Page, M. J.; Symeonidis, M. +4 more
We present an intrinsic AGN spectral energy distribution (SED) extending from the optical to the submm, derived with a sample of unobscured, optically luminous (νLν,5100 > 1043.5 erg s-1) QSOs at z < 0.18 from the Palomar Green survey. The intrinsic AGN SED was computed by removing the contribution from stars…
ALFALFA Discovery of the Most Metal-poor Gas-rich Galaxy Known: AGC 198691
McQuinn, Kristen B. W.; Cannon, John M.; Skillman, Evan D. +12 more
We present spectroscopic observations of the nearby dwarf galaxy AGC 198691. This object is part of the Survey of H I in Extremely Low-Mass Dwarfs project, which is a multi-wavelength study of galaxies with H I masses in the range of 106-107.2 M ⊙, discovered by the Arecibo Legacy Fast ALFA (ALFALFA) survey. We hav…
Thermal SZ fluctuations in the ICM: probing turbulence and thermodynamics in Coma cluster with Planck
Khatri, Rishi; Gaspari, Massimo
We report the detection of thermal Sunyaev-Zeldovich (SZ) effect fluctuations in the intracluster medium (ICM) of Coma cluster observed with Planck. The SZ data links the maximum observable X-ray scale to the large Mpc scale, extending our knowledge of the power spectrum of ICM fluctuations. Deprojecting the 2D SZ perturbations into 3D pressure fl…
Star-forming Brightest Cluster Galaxies at 0.25 < z < 1.25: A Transitioning Fuel Supply
Schrabback, T.; Zenteno, A.; Desai, S. +23 more
We present a multiwavelength study of the 90 brightest cluster galaxies (BCGs) in a sample of galaxy clusters selected via the Sunyaev Zel’dovich effect by the South Pole Telescope, utilizing data from various ground- and space-based facilities. We infer the star-formation rate (SFR) for the BCG in each cluster—based on the UV and IR continuum lum…
Kinematic Sunyaev-Zel'dovich effect with projected fields. II. Prospects, challenges, and comparison with simulations
Spergel, David N.; Ferraro, Simone; Hill, J. Colin +2 more
The kinematic Sunyaev-Zel'dovich (kSZ) signal is a powerful probe of the cosmic baryon distribution. The kSZ signal is proportional to the integrated free electron momentum rather than the electron pressure (which sources the thermal SZ signal). Since velocities should be unbiased on large scales, the kSZ signal is an unbiased tracer of the large-…
Unprecedented Fine Structure of a Solar Flare Revealed by the 1.6 m New Solar Telescope
Xu, Yan; Cao, Wenda; Liu, Chang +3 more
Solar flares signify the sudden release of magnetic energy and are sources of so called space weather. The fine structures (below 500 km) of flares are rarely observed and are accessible to only a few instruments world-wide. Here we present observation of a solar flare using exceptionally high resolution images from the 1.6 m New Solar Telescope (…
Hubble Frontier Fields: predictions for the return of SN Refsdal with the MUSE and GMOS spectrographs
Kneib, J. -P.; Smith, G. P.; Egami, E. +13 more
We present a high-precision mass model of the galaxy cluster MACS J1149.6+ 2223, based on a strong gravitational lensing analysis of Hubble Space Telescope Frontier Fields (HFF) imaging data and spectroscopic follow-up with Gemini/Gemini Multi-Object Spectrographs (GMOS) and Very Large Telescope (VLT)/Multi Unit Spectroscopic Explorer (MUSE). Our …
Massive star mergers and the recent transient in NGC 4490: a more massive cousin of V838 Mon and V1309 Sco
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Smith, Nathan +11 more
The Galactic transient V1309 Sco was the result of a merger in a low-mass star system, while V838 Mon was thought to be a similar merger event from a more massive B-type progenitor. In this paper, we study a recent optical and infrared (IR) transient discovered in the nearby galaxy NGC 4490 named NGC 4490-OT2011 (NGC 4490-OT hereafter), which appe…