A Reassessment of the Data and Models of the Gravitational Lens Q0957+561

Barkana, Rennan; Lehár, Joseph; Falco, E.; Grogin, Norman A.; Keeton, Charles R.; Shapiro, I. I.

doi:10.1086/307469

Cited by 29 publications

(44 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3). If corresponding features can be resolved in component B, it may be possible to construct models based on the detailed substructure of the jets, similar to the analysis performed on QSO 0957+561 (Barkana et al 1999). Such observations should also determine whether the slight bend in the B jet suggested by the current VLBA 5‐GHz data is real.…”

Section: Discussionmentioning

confidence: 99%

High-resolution observations and mass modelling of the CLASS gravitational lens B1152+199

Rusin¹,

Norbury²,

Biggs³

et al. 2002

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

We present a series of high‐resolution radio and optical observations of the CLASS gravitational lens system B1152+199 obtained with the Multi‐Element Radio‐Linked Interferometer Network, Very Long Baseline Array and Hubble Space Telescope. Based on the milliarcsecond‐scale substructure of the lensed radio components and precise optical astrometry for the lensing galaxy, we construct models for the system and place constraints on the galaxy mass profile. For a single galaxy model with surface mass density Σ(r)∝r−β, we find that 0.95β1.21 at 2σ confidence. Including a second deflector to represent a possible satellite galaxy of the primary lens leads to slightly steeper mass profiles.

show abstract

Section: Discussionmentioning

confidence: 99%

High-resolution observations and mass modelling of the CLASS gravitational lens B1152+199

Rusin¹,

Norbury²,

Biggs³

et al. 2002

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

show abstract

“…Again, progress can be made by appropriate modelling of the cluster, and many attempts have been made to do this for 0957+561 (e.g. Kundic et al 1997; Bernstein & Fischer 1999; Barkana et al 1999), although there remain uncertainties in the final H 0 estimate. As an alternative, the optical/infrared images of the host galaxy may make an important contribution towards the breaking of degeneracies (Keeton et al 2000).…”

Section: Introductionmentioning

confidence: 99%

The Hubble constant from the gravitational lens CLASS B0218+357 using the Advanced Camera for Surveys

York

Jackson

Browne

et al. 2004

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

We present deep optical observations of the gravitational lens system CLASS B0218+357, from which we derive an estimate for the Hubble constant (H0). Extensive radio observations using the VLA, MERLIN, the VLBA and VLBI have reduced the degeneracies between H0 and the mass model parameters in this lens to one involving only the position of the radio‐quiet lensing galaxy with respect to the lensed images. B0218+357 has an image separation of only 334 mas, so optical observations have, up until now, been unable to resolve the lens galaxy from the bright lensed images. Using the new Advanced Camera for Surveys (ACS), installed on the Hubble Space Telescope in 2002, we have obtained deep optical images of the lens system and surrounding field. These observations have allowed us to determine the separation between the lens galaxy centre and the brightest image, and so estimate H0. We find an optical galaxy position, and hence an H0 value, that varies depending on our approach to the spiral arms in B0218+357. If the most prominent spiral arms are left unmasked, we find H0= 70 ± 5 km s−1 Mpc−1 (95 per cent confidence). If the spiral arms are masked out, we find H0= 61 ± 7 km s−1 Mpc−1 (95 per cent confidence).

show abstract

“…The code has been applied on 6 different models of Q0957+561 (Table 2), all based on previous work by Barkana et al (1999) and Chae et al (1999). The mass distributions of three models are based on King profiles, as proposed by Falco et al (1985-models: FGS, FGSE, FGSE+CL), the remaining three on a softened power-law distribution, as suggested by Grogin et al (1996-models: SPLS, SPEMD, SPEMD+CL).…”

Section: Modelling Q0957+561mentioning

confidence: 99%

“…κ)) where κ = Σ clus /Σ crit is defined as the surface mass density of the cluster in units of the critical surface density (Barkana et al 1999). For the spherical models, κ = 0 and for the elliptical ones it can be approximated by κ γ, i.e.…”

Section: Line Emissionmentioning

confidence: 99%

Q0957+561 revised: CO emission from a disk at z = 1.4

Krips

Neri

Eckart

et al. 2005

A&A

View full text Add to dashboard Cite

Abstract. Based on additional interferometric observations, we reanalysed the CO(2−1) and 3 mm continuum emission of Q0957+561, a lensed QSO at a redshift of z = 1.4141. The emission in the CO(2−1) lines reveals a gas-rich host galaxy with a peculiar double-peaked profile at one of the two lensed images. Our new interferometric CO maps of the host galaxy agree well with HST images obtained by Keeton et al. (2000) and we thus argue that the two velocity components arise from molecular gas in the disk of the host galaxy. We also present new model calculations, all in excellent agreement with recent time delay measurements and simulations.

show abstract

A Reassessment of the Data and Models of the Gravitational Lens Q0957+561

Cited by 29 publications

References 62 publications

High-resolution observations and mass modelling of the CLASS gravitational lens B1152+199

High-resolution observations and mass modelling of the CLASS gravitational lens B1152+199

The Hubble constant from the gravitational lens CLASS B0218+357 using the Advanced Camera for Surveys

Q0957+561 revised: CO emission from a disk at z = 1.4

Contact Info

Product

Resources

About