2026ApJ...999..198K

Query : 2026ApJ...999..198K

2026ApJ...999..198K - Astrophys. J., 999, 198 (2026/March-2)

The DESI Single Fiber Lens Search. I. Four Thousand Spectroscopically Selected Galaxy-Galaxy Gravitational Lens Candidates.

KARP J.S.M., SCHLEGEL D.J., HUANG X., PADMANABHAN N., BOLTON A.S., STORFER C.J., AGUILAR J., AHLEN S., BAILEY S., BIANCHI D., BROOKS D., CASTANDER F.J., CLAYBAUGH T., CUCEU A., DE LA MACORRA A., DELLA COSTA J., DOEL P., FONT-RIBERA A., FORERO-ROMERO J.E., GAZTANAGA E., GONTCHO A GONTCHO S., GUTIERREZ G., HONSCHEID K., ISHAK M., JIMENEZ J., JOYCE R., JUNEAU S., KIRKBY D., KREMIN A., LAMMAN C., LANDRIAU M., LE GUILLOU L., MANERA M., MARTINI P., MEISNER A., MIQUEL R., MOUSTAKAS J., NADATHUR S., PERCIVAL W.J., POPPETT C., PRADA F., PEREZ-RAFOLS I., ROSSI G., SANCHEZ E., SCHUBNELL M., SPRAYBERRY D., TARLE G., WEAVER B.A., ZHOU R. (The DESI Collaboration)

Abstract (from CDS):

We present 4110 strong gravitational lens candidates, 3887 of which are new discoveries, selected from a sample of 5,837,154 luminous red galaxies (LRGs) observed with the Dark Energy Spectroscopic Instrument (DESI). Candidates are identified via the presence of background ionized oxygen [O II] nebular emission lines in the foreground LRG spectra, which may originate from the lensing of higher-redshift star-forming galaxies. Using the measured foreground redshift, background redshift, and integrated flux of the background [O II] doublet, we integrate over impact parameters to compute the probability that each candidate is a lens. We expect 53% of candidates to be true lenses with Einstein radii ranging from 0$\mathop{.}\limits^{\unicode{x02033}}$1-4″, which can be confirmed with high-resolution imaging. Confirmed strong lenses from this sample will form a valuable cosmological data set, as strong gravitational lensing is the only method to directly measure dark matter halo substructure at cosmological distances. We independently recover the host of the multiply imaged gravitationally lensed type Ia supernova iPTF16geu. Monitoring these lenses for future multiply lensed transients will enable (a) H0 measurements via time-delay cosmography and (b) substructure measurements via flux ratios.

Abstract Copyright: © 2026. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Strong gravitational lensing - Early-type galaxies - Starburst galaxies - Gravitational lensing - Einstein rings

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NVSS J094656+100649 rG 09 46 56.6809160266 +10 06 52.903093208     17.78   17.09 ~ 41 0
2 ACT-CL J1424.8-0052 ClG 14 24 49.0 -00 53 22           ~ 9 0
3 NAME Eye of Horus gLS 14 24 49.0 -00 53 22           ~ 5 0
4 AGEL J150745+052256 lens gLe 15 07 45.10 +05 22 56.3           ~ 4 0
5 SN 2016geu SN* 21 04 15.86 -06 20 24.5           SNIa 78 0

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