A gravitational lens candidate with an unusually red optical counterpart

Hewitt, J. N.; Turner, Edwin L.; Lawrence, C. R.; Schneider, D. P.; Brody, James P.

doi:10.1086/116290

Cited by 97 publications

(104 citation statements)

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“…The distribution of the point-like images around the central galaxy shows a typical strong lens configuration: a pair of close images (A and B) and two images spread toward north (C) and south-west (D), similar to the configuration of the lensed quasars PG 1115+080 (Schechter et al 1997), MG0414+0534 (Hewitt et al 1992), and WFI J2033-4723 (Morgan et al 2004). Moreover, the point-like shape of the images suggests that the background source is an AGN.…”

Section: The Multi-band Imagesmentioning

confidence: 72%

COSMOS 5921+0638: characterization and analysis of a new strong gravitationally lensed AGN

Anguita

Fauré

Kneib

et al. 2009

A&A

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Context. Strong lens candidates have been newly identified within the COSMOS field. We present VLT/FORS1 spectroscopic followup observations and HST/WFPC2 imaging of the system COSMOS 5921+0638, which exhibits quadruply lensed images and a perfect Einstein ring. Aims. We investigate the nature of COSMOS 5921+0638 by studying its photometric, spectroscopic and physical properties. Methods. By analyzing our VLT/FORS1 spectroscopy and Subaru/CFHT/HST imaging of COSMOS 5921+0638, we completed both an environmental analysis and detailed analytical and grid-based mass modeling to determine it properties. Results. We measured the redshifts of the lensing galaxy in COSMOS 5921+0638 (z l = 0.551 ± 0.001) and 9 additional galaxies in the field (5 of them at z ∼ 0.35). The redshift of the lensed source was inferred by identifying a candidate Lyα line at z s = 3.14 ± 0.05. The mass modeling reveals the requirement of a small external shear (γ = 0.038), which is slightly larger than the lensing contribution expected by galaxy groups along the line-of-sight obtained from the zCOSMOS optical group catalog (κ groups ∼ 0.01 and γ groups ∼ 0.005). The estimated time-delays between the different images are of the order of hours to half a week and the total magnification of the background source is μ ≈ 150. The measured mass-to-light ratio of the lensing galaxy within the Einstein ring is M/L B ≈ 8.5 ± 1.6. Anomalies are observed between the measured and expected flux ratios of the images of the background AGN. Conclusions. Our analysis indicates that the ring and point-like structures in COSMOS 5921+0638 consist of a lensed high redshift galaxy hosting a low luminosity AGN (LLAGN). The observed flux ratio anomalies are probably due to microlensing by stars in the lensing galaxy and/or a combination of static phenomena. Multi-epoch, multi-band space-based observations would allow us to differentiate between the possible causes of these anomalies, since static and/or dynamic variations could be identified. Because of its short time-delays and the possibility of microlensing, COSMOS 5921+0638 is a promising laboratory for future studies of LLAGNs.

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Section: The Multi-band Imagesmentioning

confidence: 72%

COSMOS 5921+0638: characterization and analysis of a new strong gravitationally lensed AGN

Anguita

Fauré

Kneib

et al. 2009

A&A

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“…The source of MG 0414+0534, at a redshift of z S = 2.639, is lensed by a foreground elliptical galaxy G (the primary lens) at z L = 0.9584 (Hewitt et al 1992;Lawrence et al 1995;Tonry & Kochanek 1999). It has been known that a canonical model, a singular isothermal ellipsoid plus an external shear (SIE-ES) does not give a good fit.…”

Section: Flux-ratio Anomalymentioning

confidence: 99%

Evidence for a Dusty Dark Dwarf Galaxy in the Quadruple Lens MG 0414+0534

Inoue

Matsushita

Minezaki

2017

ApJL

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We report the 4 σ detection of a faint object with a flux of ∼ 0.3 mJy, in the vicinity of the quadruply lensed QSO MG 0414+0534 using the Atacama Large Millimeter/submillimeter array (ALMA) Band 7. The object is most probably a dusty dark dwarf galaxy, which has not been detected in either the optical, near-infrared (NIR) or radio (cm) bands. An anomaly in the flux ratio of the lensed images observed in Band 7 and the mid-infrared (MIR) band and the reddening of the QSO light color can be simultaneously explained if we consider the object as a lensing substructure with an ellipticity ∼ 0.7 at a redshift of 0.5 z 1. Using the best-fit lens models with three lenses, we find that the dark matter plus baryon mass associated with the object is ∼ 10 9 M ⊙ , the dust mass is ∼ 10 7 M ⊙ and the linear size is 5 kpc. Thus our findings suggest that the object is a dusty dark dwarf galaxy. A substantial portion of faint submillimeter galaxies (SMGs) in the universe may be attributed to such dark objects.

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“…By this process the lens systems B0218+257 (Patnaik et al 1993b), B1422+231 (Patnaik et al 1992b) and B1938+666 (King et al 1997) were discovered. Also in the survey is the known system MG0414+0534 (Hewitt et al 1989;Hewitt et al 1992) and the probable lens B2114+022 (Augusto et al 1998). The advantage of JVAS compared to the MIT -Green Bank (MG) lens survey (Bennett et al 1986) is that by observing only flat spectrum, hence core-dominated, sources, it is relatively straightforward to recognize lens systems, even those which consist of just two images.…”

Section: Introductionmentioning

confidence: 99%

The new gravitational lens system B1030 + 074

Xanthopoulos

Browne

King

et al. 1998

Monthly Notices RAS

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We report the discovery of a new double image gravitational lens system B1030+074 which was found during the Jodrell Bank -VLA Astrometric Survey (JVAS). We have collected extensive radio data on the system using the VLA, MERLIN, the EVN and the VLBA and optical observations using WFPC2 on the HST. The lensed images are separated by 1.56 arcseconds and their flux density ratio at centimetric wavelengths is approximately 14:1 although the ratio is slightly frequency dependent and the images appear to be time variable. The HST pictures show both the lensed images and the lensing galaxy close to the weaker image. The lensing galaxy has substructure which could be a spiral arm or an interacting galaxy.

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A gravitational lens candidate with an unusually red optical counterpart

Cited by 97 publications

References 0 publications

COSMOS 5921+0638: characterization and analysis of a new strong gravitationally lensed AGN

COSMOS 5921+0638: characterization and analysis of a new strong gravitationally lensed AGN

Evidence for a Dusty Dark Dwarf Galaxy in the Quadruple Lens MG 0414+0534

The new gravitational lens system B1030 + 074

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