Galaxy And Mass Assembly (GAMA) Blended Spectra Catalog: Strong Galaxy-Galaxy Lens and Occulting Galaxy Pair Candidates

Abstract

We present the catalogue of blended galaxy spectra from the Galaxy And Mass Assembly (GAMA) survey. These are cases where light from two galaxies are significantly detected in a single GAMA fibre. Galaxy pairs identified from their blended spectrum fall into two principal classes: they are either strong lenses, a passive galaxy lensing an emission-line galaxy; or occulting galaxies, serendipitous overlaps of two galaxies, of any type. Blended spectra can thus be used to reliably identify strong lenses for follow-up observations (high resolution imaging) and occulting pairs, especially those that are a late-type partly obscuring an early-type galaxy which are of interest for the study of dust content of spiral and irregular galaxies. The GAMA survey setup and its autoz automated redshift determination were used to identify candidate blended galaxy spectra from the cross-correlation peaks. We identify 280 blended spectra with a minimum velocity separation of 600 km/s, of which 104 are lens pair candidates, 71 emission-line-passive pairs, 78 are pairs of emission-line galaxies and and 27 are pairs of galaxies with passive spectra. We have visually inspected the candidates in the Sloan Digital Sky Survey (SDSS) and Kilo Degree Survey (KiDS) images. Many blended objects are ellipticals with blue fuzz (Ef in our classification). These latter "Ef" classifications are candidates for possible strong lenses, massive ellipticals with an emission-line galaxy in one or more lensed images. The GAMA lens and occulting galaxy candidate samples are similar in size to those identified in the entire SDSS. This blended spectrum sample stands as a testament of the power of this highly complete, second-largest spectroscopic survey in existence and offers the possibility to expand e.g., strong gravitational lens surveys.

arXiv comment12 pages, 10 figures, 3 tables. Table 3 full length version is in the appendix. Accepted for publication by MNRAS, typo fixed so Figure 2 is included properly

References in corpus (53)

• Galaxy Zoo : Morphologies derived from visual inspection of galaxies from the Sloan Digital Sky Survey
• The Fourth Data Release of the Sloan Digital Sky Survey
• Galaxy and Mass Assembly (GAMA): survey diagnostics and core data release
• The Sloan Lens ACS Survey. III - The Structure and Formation of Early-type Galaxies and their Evolution since z~1
• The Sloan Lens ACS Survey. I. A Large Spectroscopically Selected Sample of Massive Early-Type Lens Galaxies
• The Sloan Lens ACS Survey. IV: the mass density profile of early-type galaxies out to 100 effective radii
• Andromeda's Dust
• The Sloan Lens ACS Survey. V. The Full ACS Strong-Lens Sample
• GAMA: towards a physical understanding of galaxy formation
• Galaxy and Mass Assembly (GAMA): The GAMA Galaxy Group Catalogue (G3Cv1)
• The Sloan-Lens ACS Survey II: stellar populations and internal structure of early-type lens galaxies
• The Sloan Lens ACS Survey. VII. Elliptical Galaxy Scaling Laws from Direct Observational Mass Measurements
• The Sloan Lens ACS Survey. VI: Discovery and analysis of a double Einstein ring
• Modelling the spectral energy distribution of galaxies. V. The dust and PAH emission SEDs of disk galaxies
• The BOSS Emission-Line Lens Survey (BELLS). I. A large spectroscopically selected sample of Lens Galaxies at redshift ~ 0.5
• Galaxy And Mass Assembly (GAMA): Galaxy close-pairs, mergers, and the future fate of stellar mass
• Investigations of dust heating in M81, M83, and NGC 2403 with the Herschel Space Observatory
• Mapping the cold dust temperatures and masses of nearby Kingfish galaxies with Herschel
• The BOSS Emission-Line Lens Survey. II. Investigating Mass-Density Profile Evolution in the SLACS+BELLS Strong Gravitational Lens Sample
• Galaxy And Mass Assembly (GAMA): autoz spectral redshift measurements, confidence and errors
• The Sloan Lens ACS Survey. VIII. The relation between environment and internal structure of early-type galaxies
• Sloan Digital Sky Survey Spectroscopic Lens Search. I. Discovery of Intermediate-Redshift Star-Forming Galaxies Behind Foreground Luminous Red Galaxies
• The Herschel-ATLAS: The dust energy balance in the edge-on spiral galaxy UGC 4754
• The Opacity of Spiral Galaxy Disks IV: Radial Extinction Profiles from Counts of Distant Galaxies seen through Foreground Disks
• The dust energy balance in the edge-on spiral galaxy NGC 4565
• Gas, Dust, and Young Stars in the Outer Disk of M 31
• A resolved analysis of cold dust and gas in the nearby edge-on spiral NGC 891
• Cool and warm dust emission from M33 (HerM33es)
• Seeing Galaxies Through Thick & Thin. III. HST Imaging of the Dust in Backlit Spiral Galaxies
• The Extinction Law in an Occulting Galaxy
• Seeing Galaxies though Thick and Thin. IV. The Superimposed Spiral Galaxies of NGC 3314
• The Herschel Virgo Cluster Survey: IV. Resolved dust analysis of spiral galaxies
• Herschel/SPIRE Observations of the Dusty Disk of NGC 4244
• HERschel Observations of Edge-on Spirals (HEROES). I: Far-infrared morphology and dust mass determination
• The extent of dust in NGC 891 from Herschel/SPIRE images
• Dust in Spiral Galaxies: Comparing Emission and Absorption to Constrain Small-Scale and Very Cold Structures
• Galaxy Zoo: A Catalog of Overlapping Galaxy Pairs for Dust Studies
• The Opacity of Spiral Galaxy Disks III: Automating the "Synthetic Field Method"
• The Opacity of Nearby Galaxies from Colors and Counts of Background Galaxies: I. The Synthetic Field Method and its Application to NGC 4536 and NGC 3664
• Seeing Galaxies Through Thick and Thin: II. Direct Measures of Extinction in Spiral Disks Through Spectroscopy of Overlapping Galaxies
• The Opacity of Spiral Galaxy Disks VI: Extinction, stellar light and color
• Spiral Disk Opacity from Occulting Galaxy Pairs in the Sloan Digital Sky Survey
• Quantifying the Biases of Spectroscopically Selected Gravitational Lenses
• The Opacity of Spiral Galaxy Disks V: dust opacity, HI distributions and sub-mm emission
• The Occulting Galaxy Pair UGC 3995; Dust properties from HST and CALIFA data
• Gaps in the cloud cover? Comparing extinction measures in spiral disks
• VLT/VIMOS Observations of an Occulting Galaxy Pair: Redshifts and Effective Extinction Curve
• The Opacity of Spiral Galaxy Disks VIII: Structure of the Cold ISM
• Host Galaxy Extinction of SNIa: Co-evolution of ISM Structure and Extinction Law with Star-Formation
• The Ultraviolet Attenuation Law in Backlit Spiral Galaxies
• The Opacity of Nearby Galaxies from Counts of Background Galaxies: II. Limits of the Synthetic Field Method
• The Opacity of Spiral Galaxy Disks VII: the accuracy of galaxy counts as an extinction probe
• Cool Dust in the Outer Ring of NGC 1291

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• Hubble Asteroid Hunter: II. Identifying strong gravitational lenses in HST images with crowdsourcing
• Archetype-Based Redshift Estimation for the Dark Energy Spectroscopic Instrument Survey
• Galaxy and Mass Assembly (GAMA): Small-scale anisotropic galaxy clustering and the pairwise velocity dispersion of galaxies
• Bayesian photometric redshifts of blended sources
• TEGLIE: Transformer encoders as strong gravitational lens finders in KiDS
• Galaxy-scale gravitational lens candidates from the Hyper Suprime-Cam imaging survey and the Galaxy And Mass Assembly spectroscopic survey
• The Subaru HSC weak lensing mass-observable scaling relations of spectroscopic galaxy groups from the GAMA survey
• The Observable Supernova Rate in Galaxy-Galaxy Lensing Systems with the TESS Satellite
• Gaussian Mixture Models for Blended Photometric Redshifts
• Modeling Strong Lenses from Wide-Field Ground-Based Observations in KiDS and GAMA
• HOLISMOKES XVI: Lens search in HSC-PDR3 with a neural network committee and post-processing for false-positive removal
• What can the occult do for you?
• Deep Extragalactic VIsible Legacy Survey (DEVILS): DR1 Blended Spectra Search for Candidate Strong Gravitational Lenses
• Galaxy And Mass Assembly: A Comparison between Galaxy-Galaxy Lens Searches in KiDS/GAMA