ASCA Observation of the Nearest Gravitational Lensing Cluster Candidate -- A 3408

Abstract

We observed the nearest gravitational lensing cluster candidate, A 3408 ($z=0.042$), with ASCA. The projected mass profile of A 3408 was determined from the ICM temperature and the $\beta$-model parameters obtained with ASCA, assuming that the hot gas is spherically symmetric and in hydrostatic equilibrium. The projected mass within an arc radius, $r_{\mathrm{arc}}$, of 110 kpc is $M(r_{\rm arc})=1.2^{+0.8}_{-0.4} \times10^{13} \MO$. This is 18 -- 45% of the mass previously derived from a lensing analysis by Campusano et al. (1998, AAA 069.160.189) without any X-ray information. The primary cause of this discrepancy is in their assumption that the center of the cluster potential coincides with the position of the brightest cluster galaxy (BCG), while we reveal the BCG position to be 60${}^{\prime \prime }$ outside of the X-ray center. We further calculated a model for the source galaxy position and the gravitational potential that can reproduce both the X-ray data and the arc image. In this model, the magnification factor of the lens for the source galaxy was evaluated to be $\Delta m=$ 0.07$\pm$0.03 mag; i.e., the source galaxy is slightly magnified by the lens cluster A 3408.

13 pages, 6 figures, to appear in PASJ vol. 53

References in corpus (7)

• The Temperature Structure of 30 Nearby Clusters Observed with ASCA. Similarity of Temperature Profiles
• Resolving the discrepancy between X-ray and gravitational lensing mass measurements for clusters of galaxies
• X-ray gas density profile of clusters of galaxies from the universal dark matter halo
• Log N - Log S Relations and Spectral Properties of Sources from the ASCA Large Sky Survey --- their Implications for the Origin of the Cosmic X-ray Background (CXB)
• A Lensed Arc in the Low Redshift Cluster Abell 2124
• Gravitational lensing in low-redshift clusters of galaxies: the arc-like object in Abell 3408 and its lensing interpretation
• Discovery of X-ray emission rom the distant lensing cluster of galaxies CL2236-04 at z = 0.552

Cited by in corpus (3)

• Extreme ultra-soft X-ray variability in an eROSITA observation of the Narrow-Line Seyfert 1 Galaxy 1H 0707-495
• EROSITA Spectro-Imaging Analysis of the Abell 3408 Galaxy Cluster
• Dynamical analysis of the cluster pair: A3407 + A3408