Sandhya M. Rao
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View article: Planet B: A Systems Engineering Framework for World Peace and Planetary Health
Planet B: A Systems Engineering Framework for World Peace and Planetary Health Open
Planetary boundary transgressions occur as the result of a conflict between human-engineered systems and the natural life-support systems on Earth. In this paper, we validate the Berkana Institute’s Two Loops Theory of Change which posits …
View article: Planet B: A Systems Engineering Approach for World Peace and Planetary Health
Planet B: A Systems Engineering Approach for World Peace and Planetary Health Open
Planetary Boundary transgressions occur as the result of a conflict between human engineered systems and the natural life-support systems on Earth. In this paper, we validate the Berkana Institute's Two Loops Theory of Change which po…
View article: Neutral-gas-phase metal abundances in Zn <scp>ii</scp>-selected quasar absorption line systems near redshift <i>z</i> = 1.2★
Neutral-gas-phase metal abundances in Zn <span>ii</span>-selected quasar absorption line systems near redshift <i>z</i> = 1.2★ Open
We present ten metallicity measurements for quasar absorbers near $z=1.2$\nthat were selected for having unusually significant ZnII absorption in their\nSDSS spectra. Follow-up UV space spectroscopy of the Ly$\\alpha$ region shows\nthat al…
View article: The statistical properties of neutral gas at z < 1.65 from UV measurements of Damped Lyman Alpha systems
The statistical properties of neutral gas at z < 1.65 from UV measurements of Damped Lyman Alpha systems Open
We derive the statistical properties of neutral gas at redshifts 0.11<z<1.65 from UV measurements of quasar Lyman alpha absorption lines corresponding to 369 MgII systems with $W^{\lambda2796}_{0} \ge 0.3$ \AA. In addition to the 41 damped…
View article: A study of the circumgalactic medium at z ∼ 0.6 using damped Lyman α galaxies
A study of the circumgalactic medium at z ∼ 0.6 using damped Lyman α galaxies Open
We present the study of a sample of nine quasi-stellar object fields, with damped Lyman α (DLA) or sub-DLA systems at z ∼ 0.6, observed with the X-Shooter spectrograph at the Very Large Telescope. By suitably positioning the X-Shooter slit…
View article: THE SDSS-IV EXTENDED BARYON OSCILLATION SPECTROSCOPIC SURVEY: LUMINOUS RED GALAXY TARGET SELECTION
THE SDSS-IV EXTENDED BARYON OSCILLATION SPECTROSCOPIC SURVEY: LUMINOUS RED GALAXY TARGET SELECTION Open
We describe the algorithm used to select the luminous red galaxy (LRG) sample for the extended Baryon Oscillation Spectroscopic Survey (eBOSS) of the Sloan Digital Sky Survey IV (SDSS-IV) using photometric data from both the SDSS and the W…
View article: The ESO UVES advanced data products quasar sample – VI. Sub-damped Lyman α metallicity measurements and the circumgalactic medium
The ESO UVES advanced data products quasar sample – VI. Sub-damped Lyman α metallicity measurements and the circumgalactic medium Open
The circumgalactic medium (CGM) can be probed through the analysis of absorbing systems in the line of sight to bright background quasars. We present measurements of the metallicity of a new sample of 15 sub-damped Lyman α absorbers (sub-D…
View article: CaII Quasar Absorbers: Statistics, Metals, Dust, and Associated Galaxies
CaII Quasar Absorbers: Statistics, Metals, Dust, and Associated Galaxies Open
We summarize results from our recent SDSS survey for CaII quasar absorbers. The survey finds 435 absorbers at z <1.34, which corresponds to ~9 Gyrs of the Universe's history. Two CaII absorber populations are identified, which we call weak…
View article: New Results on DLA Systems: Statistics
New Results on DLA Systems: Statistics Open
The damped Lyman-α absorption-line systems (DLAs) that are observed in quasar spectra arise in neutral-gas-rich regions of intervening galaxies. With the highest neutral hydrogen column densities observed ( N ( HI ) ⩾ 2 × 10 20 atoms cm −2…
View article: Ca ii absorbers in the Sloan Digital Sky Survey: element abundances and dust
Ca ii absorbers in the Sloan Digital Sky Survey: element abundances and dust Open
We present measurements of element abundance ratios and dust in CaII~absorbers identified in SDSS DR7+DR9. In an earlier paper we formed a statistical sample of 435 CaII absorbers and postulated that their statistical properties might be r…
View article: 36 new, high-probability, damped Lyα absorbers at redshift 0.42 < z < 0.70
36 new, high-probability, damped Lyα absorbers at redshift 0.42 < z < 0.70 Open
Quasar damped Ly-alpha (DLA) absorption line systems with redshifts z<1.65\nare used to trace neutral gas over approximately 70 per cent of the most recent\nhistory of the Universe. However, such systems fall in the UV and are rarely\nfoun…