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Metallicity Calibrations and the Mass-Metallicity Relation for Star-forming Galaxies
We investigate the effect of metallicity calibrations, AGN classification, and aperture covering fraction on the local mass-metallicity (M-Z) relation using 27,730 star-forming galaxies from the SDSS…
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A CATALOG OF BULGE+DISK DECOMPOSITIONS AND UPDATED PHOTOMETRY FOR 1.12 MILLION GALAXIES IN THE SLOAN DIGITAL SKY SURVEY
We perform two-dimensional, point-spread-function-convolved, bulge+disk decompositions in the g and r bandpasses on a sample of 1,123,718 galaxies from the Legacy area of the Sloan Digital Sky Survey…
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GALAXY PAIRS IN THE SLOAN DIGITAL SKY SURVEY. I. STAR FORMATION, ACTIVE GALACTIC NUCLEUS FRACTION, AND THE LUMINOSITY/MASS–METALLICITY RELATION
We present a sample of 1716 galaxies with companions within Δv <500 km s−1, rp< 80 h−170 kpc and stellar mass ratio 0.1 < M1/M2 < 10 from the Sloan Digital Sky Survey Data Release 4. The galaxy pairs…
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Clues to the Origin of the Mass-Metallicity Relation: Dependence on Star Formation Rate and Galaxy Size
We use a sample of 43,690 galaxies selected from the Sloan Digital Sky Survey Data Release 4 to study the systematic effects of specific star formation rate (SSFR) and galaxy size (as measured by the…
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The Giant Gemini GMOS survey of zem > 4.4 quasars – I. Measuring the mean free path across cosmic time
We have obtained spectra of 163 quasars at zem > 4.4 with the Gemini Multi Object Spectrometers, the largest publicly available sample of high-quality, low-resolution spectra at these redshifts. From…
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Metal Abundances at z < 1.5: Fresh Clues to the Chemical Enrichment History of Damped Lyα Systems
We explore the redshift evolution of the metal content of damped Lyα systems (DLAs) with new observations of four absorbers at z<1.5; together with other recently published data, there is now a…
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The parkes half-jansky flat-spectrum sample
We present a new sample of Parkes half-jansky flat-spectrum radio sources, having made a particular effort to find any previously unidentified sources. The sample contains 323 sources selected…
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An optical supernova associated with the X-ray flash XRF 060218
TLDR
The data, combined with radio and X-ray observations, suggest that XRF 060218 is an intrinsically weak and soft event, rather than a classical GRB observed off-axis, which extends the GRB–supernova connection to X-rays flashes and fainter supernovae, implying a common origin.
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THE QUASAR OUTFLOW CONTRIBUTION TO AGN FEEDBACK: VLT MEASUREMENTS OF SDSS J0318-0600
We present high spectral resolution Very Large Telescope observations of the broad absorption line quasar SDSS J0318 − 0600. This high-quality data set allows us to extract accurate ionic column…
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The Enrichment History of the Intergalactic Medium—Measuring the C IV/H I Ratio in the Lyα Forest
We have obtained an exceptionally high signal-to-noise, high-resolution spectrum of the gravitationally lensed quasar Q1422+231. A total of 34 C IV systems are identified, several of which had not…
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