Search Publications
Constraints on Non-flat Cosmologies with Massive Neutrinos after Planck 2015
Ratra, Bharat; Chen, Yun; Biesiada, Marek +2 more
We investigate two dark energy cosmological models (I.e., the ΛCDM and ϕCDM models) with massive neutrinos assuming two different neutrino mass hierarchies in both the spatially flat and non-flat scenarios, where in the ϕCDM model the scalar field possesses an inverse power-law potential, V(ϕ) ∝ ϕ -α (α > 0). Cosmic microwave backgr…
Space Telescope and Optical Reverberation Mapping Project. IV. Anomalous Behavior of the Broad Ultraviolet Emission Lines in NGC 5548
Im, M.; Geier, S.; Brandt, W. N. +98 more
During an intensive Hubble Space Telescope (HST) Cosmic Origins Spectrograph (COS) UV monitoring campaign of the Seyfert 1 galaxy NGC 5548 performed from 2014 February to July, the normally highly correlated far UV continuum and broad emission line variations decorrelated for ∼60-70 days, starting ∼75 days after the first HST/COS observation. Foll…
Low-metallicity Absorbers Account for Half of the Dense Circumgalactic Gas at z ≲ 1
Prochaska, J. Xavier; Lehner, Nicolas; Howk, J. Christopher +2 more
We present an analysis of the metallicity distribution of the dense circumgalactic medium (CGM) of galaxies at 0.1 ≲ z ≲ 1.1 as probed by partial Lyman limit systems (pLLSs, 16.1 < log {N}{{H}{{I}}} < 17.2) and LLSs (17.2 ≤ log {N}{{H}{{I}}} < 17.7 in our sample). The new H I-selected sample, drawn from our Hubble Sp…
The BOSS Emission-line Lens Survey. III. Strong Lensing of Lyα Emitters by Individual Galaxies
Brownstein, Joel R.; Marques-Chaves, Rui; Oguri, Masamune +8 more
We introduce the Baryon Oscillation Spectroscopic Survey (BOSS) Emission-Line Lens Survey GALaxy-Lyα EmitteR sYstems (BELLS GALLERY) Survey, which is a Hubble Space Telescope program to image a sample of galaxy-scale strong gravitational lens candidate systems with high-redshift Lyα emitters (LAEs) as the background sources. The goal of the BELLS …
First Observational Support for Overlapping Reionized Bubbles Generated by a Galaxy Overdensity
Maiolino, R.; Dickinson, M.; Giavalisco, M. +21 more
We present an analysis of deep Hubble Space Telescope (HST) multi-band imaging of the BDF field specifically designed to identify faint companions around two of the few Lyα emitting galaxies spectroscopically confirmed at z ∼ 7. Although separated by only 4.4 proper Mpc these galaxies cannot generate H II regions large enough to explain the visibi…
Timing Observations of PSR J1023+0038 During a Low-mass X-Ray Binary State
Deller, Adam T.; Bogdanov, Slavko; Hessels, Jason W. T. +5 more
Transitional millisecond pulsars (tMSPs) switch, on roughly multi-year timescales, between rotation-powered radio millisecond pulsar (RMSP) and accretion-powered low-mass X-ray binary (LMXB) states. The tMSPs have raised several questions related to the nature of accretion flow in their LMXB state and the mechanism that causes the state switch. Th…
Marginalizing Instrument Systematics in HST WFC3 Transit Light Curves
Wakeford, H. R.; Sing, D. K.; Deming, D. +2 more
Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) infrared observations at 1.1-1.7 µm probe primarily the H2O absorption band at 1.4 µm, and have provided low-resolution transmission spectra for a wide range of exoplanets. We present the application of marginalization based on Gibson to analyze exoplanet transit light …
Evolution of Intrinsic Scatter in the SFR-Stellar Mass Correlation at 0.5 < z < 3
Bell, Eric F.; Ferguson, Henry C.; Grogin, Norman A. +16 more
We present estimates of intrinsic scatter in the star formation rate (SFR)-stellar mass (M*) correlation in the redshift range 0.5< z< 3.0 and in the mass range {10}7< {M}*< {10}11M⊙. We utilize photometry in the Hubble Ultradeep Field (HUDF12) and Ultraviolet Ultra Deep Field (UVU…
The Properties of the Circumgalactic Medium in Red and Blue Galaxies: Results from the COS-GASS+COS-Halos Surveys
Heckman, Timothy; Saintonge, Amelie; Davé, Romeel +7 more
We use the combined data from the COS-GASS and COS-Halos surveys to characterize the Circum-Galactic Medium (CGM) surrounding typical low-redshift galaxies in the mass range {M}* ∼ {10}9.5-11.5 {M}⊙ , and over a range of impact parameters extending to just beyond the halo virial radius (R vir). We find t…
Proplyds Around a B1 Star: 42 Orionis in NGC 1977
Fang, Min; Facchini, Stefano; Clarke, Cathie J. +1 more
We present the discovery of seven new proplyds (I.e., sources surrounded by cometary Hα emission characteristic of offset ionization fronts (IFs)) in NGC 1977, located about 30‧ north of the Orion Nebula Cluster (ONC) at a distance of ∼400 pc. Each of these proplyds is situated at projected distances 0.04-0.27 pc from the B1V star 42 Orionis (c Or…