Search Publications
Measuring the Physical Conditions in High-redshift Star-forming Galaxies: Insights from KBSS-MOSFIRE
Pettini, Max; Steidel, Charles C.; Rudie, Gwen C. +2 more
We use photoionization models that are designed to reconcile the joint rest-UV-optical spectra of high-z star-forming galaxies to self-consistently infer the gas chemistry and nebular ionization and excitation conditions for ∼150 galaxies from the Keck Baryonic Structure Survey (KBSS), using only observations of their rest-optical nebular spectra.…
BANYAN. XIII. A First Look at Nearby Young Associations with Gaia Data Release 2
Faherty, Jacqueline K.; Gagné, Jonathan
In this paper, we examine the nearest 100 pc entries in Data Release 2 of Gaia to identify previously unrecognized candidate members in young associations. We analyze 695 952 stars with the BANYAN Σ Bayesian classification software and discover 898 new high-likelihood candidate members that span a wide range of properties, from spectral types B9 t…
The Brightest Galaxies in the Dark Ages: Galaxies’ Dust Continuum Emission during the Reionization Era
Finkelstein, Steven L.; Casey, Caitlin M.; Zavala, Jorge A. +6 more
Though half of cosmic starlight is absorbed by dust and reradiated at long wavelengths (3 µm-3 mm), constraints on the infrared through the millimeter galaxy luminosity function (or the “IRLF”) are poor in comparison to the rest-frame ultraviolet and optical galaxy luminosity functions, particularly at z ≳ 2.5. Here, we present a backward ev…
The MOSDEF Survey: Significant Evolution in the Rest-frame Optical Emission Line Equivalent Widths of Star-forming Galaxies at z = 1.4-3.8
Barro, Guillermo; Siana, Brian; Shapley, Alice E. +13 more
We use extensive spectroscopy from the MOSFIRE Deep Evolution Field survey to investigate the relationships between rest-frame optical emission line equivalent widths (W) and a number of galaxy and interstellar medium (ISM) characteristics for a sample of 1134 star-forming galaxies at redshifts 1.4 ≲ z ≲ 3.8. We examine how the equivalent widths o…
Off the Beaten Path: Gaia Reveals GD-1 Stars outside of the Main Stream
Price-Whelan, Adrian M.; Bonaca, Ana
Tidally disrupted globular clusters are transformed into thin, dynamically cold streams of stars that are extremely valuable tracers of the large- and small-scale distribution of mass in the Galaxy. Using data from the Gaia second data release combined with Pan-STARRS photometry, we present a sample of highly probable members of the longest cold s…
The Globular Cluster Systems of Ultra-diffuse Galaxies in the Coma Cluster
den Brok, Mark; Côté, Patrick; Peng, Eric W. +4 more
Ultra-diffuse galaxies (UDGs) are unusual galaxies with low luminosities, similar to classical dwarf galaxies, but with sizes up to ∼5 larger than expected for their mass. Some UDGs have large populations of globular clusters (GCs), something unexpected in galaxies with such low stellar density and mass. We have carried out a comprehensive study o…
SILVERRUSH. V. Census of Lyα, [O III] λ5007, Hα, and [C II] 158 µm Line Emission with ∼1000 LAEs at z = 4.9-7.0 Revealed with Subaru/HSC
Ono, Yoshiaki; Ouchi, Masami; Martin, Crystal L. +23 more
We investigate Lyα, [O III] λ5007, Hα, and [C II] 158 µm emission from 1124 galaxies at z = 4.9-7.0. Our sample is composed of 1092 Lyα emitters (LAEs) at z = 4.9, 5.7, 6.6, and 7.0 identified by Subaru/Hyper-Suprime-Cam (HSC) narrowband surveys covered by Spitzer Large Area Survey with Hyper-Suprime-Cam (SPLASH) and 34 galaxies at z = 5.148…
A Window on the Earliest Star Formation: Extreme Photoionization Conditions of a High-ionization, Low-metallicity Lensed Galaxy at z ∼ 2*
Pettini, Max; Erb, Dawn K.; Brammer, Gabriel B. +2 more
We report new observations of SL2S J021737-051329, a lens system consisting of a bright arc at z = 1.84435, magnified ∼17× by a massive galaxy at z = 0.65. SL2S0217 is a low-mass (M < 109 M ⊙), low-metallicity (Z ∼ 1/20 Z ⊙) galaxy, with extreme star-forming conditions that produce strong nebular UV emission lin…
NICER and Fermi GBM Observations of the First Galactic Ultraluminous X-Ray Pulsar Swift J0243.6+6124
Remillard, Ronald A.; Chakrabarty, Deepto; Ray, Paul S. +20 more
Swift J0243.6+6124 is a newly discovered Galactic Be/X-ray binary, revealed in late 2017 September in a giant outburst with a peak luminosity of 2 × 1039(d/7 kpc)2 erg s-1 (0.1-10 keV), with no formerly reported activity. At this luminosity, Swift J0243.6+6124 is the first known galactic ultraluminous X-ray pulsar.…
Gaia-DR2 Confirms VLBA Parallaxes in Ophiuchus, Serpens, and Aquila
Kounkel, Marina; Rodríguez, Luis F.; Loinard, Laurent +9 more
We present Gaia-DR2 astrometry of a sample of YSO candidates in Ophiuchus, Serpens Main, and Serpens South/W40 in the Aquila Rift, which had been mainly identified by their infrared excess with Spitzer. We compare the Gaia-DR2 parallaxes against published and new parallaxes obtained from our Very Long Baseline Array (VLBA) program Gould’s Belt Dis…