RVSAO 2.0: Digital Redshifts and Radial Velocities

Abstract

RVSAO is a set of programs to obtain redshifts and radial velocities from digital spectra. RVSAO operates in the IRAF(Tody 1986, 1993) environment. The heart of the system is xcsao, which implements the cross-correlation method, and is a direct descendant of the system built by Tonry and Davis (1979). emsao uses intelligent heuristics to search for emission lines in spectra, then fits them to obtain a redshift. sumspec shifts and sums spectra to build templates for cross-correlation. linespec builds synthetic spectra given a list of spectral lines. bcvcorr corrects velocities for the motion of the earth. We discuss in detail the parameters necessary to run xcsao and emsao properly. We discuss the reliability and error associated with xcsao derived redshifts. We develop an internal error estimator, and we show how large, stable surveys can be used to develop more accurate error estimators. We develop a new methodology for building spectral templates for galaxy redshifts. We show how to obtain correlation velocities using emission line templates. Emission line correlations are substantially more efficient than the previous standard technique, automated emission line fitting. We compare the use of RVSAO with new methods, which use Singular Value Decomposition and ${\chi }^2$ fitting techniques.

42 pages, 74 figures, aastex, submitted to PASP, 13. March 1998 More info at http://tdc-www.harvard.edu/, second version with revised figures

References in corpus (2)

• Automatic Redshift Determination by use of Principal Component Analysis --- I: Fundamentals
• The Century Survey: A Deeper Slice of the Universe

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• A Low-Mass Pre-Main-Sequence Eclipsing Binary in Lower Centaurus Crux Discovered with TESS
• Combining Strong Lensing and Dynamics in Galaxy Clusters: integrating MAMPOSSt within LENSTOOL I. Application on SL2S J02140-0535
• Today a Duo, But Once a Trio? The Double White Dwarf HS 2220$+$2146 May Be A Post-Blue Straggler Binary
• Improved prospects for the detection of new Large Magellanic Cloud planetary nebulae
• The Astrometric-Spectroscopic Binary System HIP 50796: An Overmassive Companion
• Spectroscopy of NGC 4258 globular cluster candidates: membership confirmation and kinematics
• Improved binary solution for the gamma-ray binary 1FGL J1018.6-5856
• Weak-Lensing Analysis of the Complex Cluster Merger Abell 746 with Subaru/Hyper Suprime-Cam
• A Gemini view of the galaxy cluster RXC J1504-0248: insights on the nature of the central gaseous filaments
• Identifying Star Streams in the Milky Way Halo
• Investigation of a transiting planet candidate in Trumpler 37: an astrophysical false positive eclipsing spectroscopic binary star
• Observation and Confirmation of Nine Strong Lensing Systems in Dark Energy Survey Year 1 Data
• Rotation Curve Measurement using Cross-Correlation
• Convolutional Neural Networks for Spectroscopic Redshift Estimation on Euclid Data
• Dynamical analysis of the cluster pair: A3407 + A3408
• The Next Generation Virgo Cluster Survey. XXXIII. Stellar Population Gradients in the Virgo Cluster Core Globular Cluster System
• The Aquarius Superclusters II. Spectroscopic and Photometric Data
• TRES Survey of Variable Diffuse Interstellar Bands
• Fresh Insights on the Kinematics of M49's Globular Cluster System with MMT/Hectospec Spectroscopy
• CFHT Optical PDCS Survey II: Evolution in the Space Density of Clusters of Galaxies
• The Kepler Eclipsing Binary V2281 Cygni with Twin Stars
• Complex diffuse emission in the $z=0.52$ cluster PLCK~G004.5-19.5
• Center for Astrophysics Optical Infrared Science Archive. I. FAST Spectrograph
• FLAIR-II spectroscopy of two DENIS J-band galaxy samples
• RX J1548.9+0851, a fossil cluster?
• Low-redshift quasars in the SDSS Stripe 82 II: associated companion galaxies and signature of star formation
• The Next Generation Virgo Cluster Survey. XVII. A Search for Planetary Nebulae in Virgo Cluster Globular Clusters
• The New Eclipsing Cataclysmic Variable SDSS 154453+2553
• An Eclipsing Binary Comprising Two Active Red Stragglers of Identical Mass and Synchronized Rotation: A Post-Mass-Transfer System or Just Born That Way?
• SpecPT (Spectroscopy Pre-trained Transformer) Model for Extragalactic Spectroscopy: I. Architecture and Automated Redshift Measurement
• JWST's PEARLS: A z=6 quasar in a train-wreck galaxy merger system
• Mysterious Globular Cluster System of the Peculiar Massive Galaxy M85
• Followup ground-based observations of the dwarf nova KZ Gem
• The cataclysmic variable CW 1045+525: a secondary-dominated dwarf nova?
• RXJ1648.7+6109: Witnessing the Formation of a Massive Group/Poor Cluster and its Brightest Galaxy
• Demise of Faint Satellites around Isolated Early-type Galaxies
• RX J0513.1+0851 AND RX J0539.9+0956: Two Young, Rapidly Rotating, Spectroscopic Binary Stars
• The kinematics of young stellar population in the W5 region of the Cassiopeia OB6 association: implication on the formation process of stellar associations
• Strong Lensing Analysis of PLCK G004.5$-$19.5, a Planck-Discovered Cluster Hosting a Radio Relic at $z=0.52$
• The physical properties and the evolution of the interacting system AM1204-292
• Low-redshift quasars in the SDSS Stripe 82 -- III MOS observations
• Recent Formation of a Spiral Disk Hosting Progenitor Globular Clusters at the center of the Perseus Brightest Cluster Galaxy: I. Spiral Disk
• The Eclipsing Binary BG Geminorum: Improved Constraints on the Orbit and the Structure of the Accretion Disk
• An Optical Study of BG Geminorum: An Ellipsoidal Binary with an Unseen Primar Star
• The $K_s$-band luminosity function of the rich cluster VC04 in the Vela supercluster
• Discovery of a New Quasar: SDSS J022155.26-064916.6
• A Kepler K2 view of subdwarf A-type stars
• Tidal Disruption of Super Star Clusters as the origin of Bluish Light at the inner region of the Perseus Cluster Central Galaxy
• A Spectroscopic View of the JWST/GTO Strong Lensing Cluster A1489
• Quiescent Galaxy Size, Velocity Dispersion, and Dynamical Mass Evolution
• A Gaia view on the star formation in the Monoceros OB1 and R1 associations
• The Redshifts from 122 Bands: Comparative Redshift Forecast for Low-Resolution Spectra from SPHEREx and 7-Dimensional Sky Survey (7DS)
• Redshifts of Objects near 3C 220.3