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Mesa Isochrones and Stellar Tracks (MIST). I. Solar-scaled Models
Choi, Jieun; Conroy, Charlie; Dotter, Aaron +3 more
This is the first of a series of papers presenting the Modules for Experiments in Stellar Astrophysics (MESA) Isochrones and Stellar Tracks (MIST) project, a new comprehensive set of stellar evolutionary tracks and isochrones computed using MESA, a state-of-the-art open-source 1D stellar evolution package. In this work, we present models with sola…
A 2.4% Determination of the Local Value of the Hubble Constant
Casertano, Stefano; Filippenko, Alexei V.; Foley, Ryan J. +12 more
We use the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST) to reduce the uncertainty in the local value of the Hubble constant from 3.3% to 2.4%. The bulk of this improvement comes from new near-infrared (NIR) observations of Cepheid variables in 11 host galaxies of recent type Ia supernovae (SNe Ia), more than doubling the sample o…
A Remarkably Luminous Galaxy at z=11.1 Measured with Hubble Space Telescope Grism Spectroscopy
Brammer, G.; Trenti, M.; Oesch, P. A. +15 more
We present Hubble WFC3/IR slitless grism spectra of a remarkably bright z ≳ 10 galaxy candidate, GN-z11, identified initially from CANDELS/GOODS-N imaging data. A significant spectroscopic continuum break is detected at λ =1.47+/- 0.01 µ {{m}}. The new grism data, combined with the photometric data, rule out all plausible lower redshift solu…
Fermi GBM Observations of LIGO Gravitational-wave Event GW150914
McBreen, S.; Meegan, C. A.; McEnery, J. E. +32 more
With an instantaneous view of 70% of the sky, the Fermi Gamma-ray Burst Monitor (GBM) is an excellent partner in the search for electromagnetic counterparts to gravitational-wave (GW) events. GBM observations at the time of the Laser Interferometer Gravitational-wave Observatory (LIGO) event GW150914 reveal the presence of a weak transient above 5…
Discovery of Coherent Pulsations from the Ultraluminous X-Ray Source NGC 7793 P13
Harrison, F. A.; Ptak, A.; Stern, D. +12 more
We report the detection of coherent pulsations from the ultraluminous X-ray source (ULX) NGC 7793 P13. The ≈0.42 s nearly sinusoidal pulsations were initially discovered in broadband X-ray observations using XMM-Newton and NuSTAR taken in 2016. We subsequently also found pulsations in archival XMM-Newton data taken in 2013 and 2014. The significan…
The MUSCLES Treasury Survey. I. Motivation and Overview
Loyd, R. O. Parke; Kowalski, Adam F.; Hawley, Suzanne L. +19 more
Ground- and space-based planet searches employing radial velocity techniques and transit photometry have detected thousands of planet-hosting stars in the Milky Way. With so many planets discovered, the next step toward identifying potentially habitable planets is atmospheric characterization. While the Sun-Earth system provides a good framework f…
The Evolution of the Galaxy Stellar Mass Function at z = 4-8: A Steepening Low-mass-end Slope with Increasing Redshift
Papovich, Casey; Finkelstein, Steven L.; Dickinson, Mark +16 more
We present galaxy stellar mass functions (GSMFs) at z = 4-8 from a rest-frame ultraviolet (UV) selected sample of ∼4500 galaxies, found via photometric redshifts over an area of ∼280 arcmin2 in the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS)/Great Observatories Origins Deep Survey (GOODS) fields and the Hubb…
ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: The Infrared Excess of UV-Selected z = 2-10 Galaxies as a Function of UV-Continuum Slope and Stellar Mass
Carilli, Chris; Labbé, Ivo; Bouwens, Rychard J. +25 more
We make use of deep 1.2 mm continuum observations (12.7 µJy beam-1 rms) of a 1 arcmin2 region in the Hubble Ultra Deep Field to probe dust-enshrouded star formation from 330 Lyman-break galaxies spanning the redshift range z = 2-10 (to ∼2-3 M ⊙ yr-1 at 1σ over the entire range). Given the depth and…
The MOSDEF Survey: Electron Density and Ionization Parameter at z ~ 2.3
Siana, Brian; Shapley, Alice E.; Reddy, Naveen A. +8 more
Using observations from the MOSFIRE Deep Evolution Field survey, we investigate the physical conditions of star-forming regions in z ∼ 2.3 galaxies, specifically the electron density and ionization state. From measurements of the [O II]λλ3726,3729 and [S II]λλ6716,6731 doublets, we find a median electron density of ∼250 cm-3 at z ∼ 2.3,…
The Chandra COSMOS Legacy survey: optical/IR identifications
Finoguenov, A.; Jahnke, K.; Silverman, J. D. +27 more
We present the catalog of optical and infrared counterparts of the Chandra COSMOS-Legacy Survey, a 4.6 Ms Chandra program on the 2.2 deg2 of the COSMOS field, combination of 56 new overlapping observations obtained in Cycle 14 with the previous C-COSMOS survey. In this Paper we report the I, K, and 3.6 µm identifications of the 22…