Chandra observations of the gravitationally lensed system 2016+112

G. Chartas, M. Bautz, G. Garmire, C. Jones, D. P. Schneider

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

An observation of the gravitationally lensed system 2016+112 with the Chandra X-Ray Observatory has resolved a mystery regarding the proposed presence of a dark matter object in the lens plane of this system. The Chandra Advanced CCD Imaging Spectrometer observation has clearly detected the lensed images of 2016+112 with positions in good agreement with those reported in the optical and also detects 13 additional X-ray sources within a radius of 3′.5. Previous X-ray observations in the direction of 2016+112 with the ROSAT HRI and ASCA Solid-State Imaging Spectrometer have interpreted the X-ray data as arising from extended emission from a dark cluster. However, the present Chandra observation can account for all the X-ray emission as originating from the lensed images and additional point X-ray sources in the field. Thus, cluster parameters based on previous X-ray observations are unreliable. We place a 3 σ upper limit on the 2-10 keV flux and luminosity of the cluster of 1.6 × 10-14 ergs s-1 cm-2 and 1.7 × 1044 ergs s-1, respectively. We estimate an upper limit on the mass-to-light ratio within a radius of 800 h-150 kpc of M/Lv < 190 h50 (M/Lv). None of the additional point X-ray sources are associated with the galaxy cluster members recently detected in deep optical and IR observations. The lensed object is quite unusual, with reported narrow emission lines in the optical that suggest it may be a type 2 quasar. Our modeling of the X-ray spectrum of the lensed object implies that the column density of an intrinsic absorber must lie between 3 and 85 × 1022 cm-2 (3 σ confidence level). The 2-10 keV luminosity of the lensed object, corrected for the lens magnification effect and using the above range of intrinsic absorption, is from 3 × 1043 to 1.4 × 1044 ergs s-1.

Original languageEnglish (US)
Pages (from-to)L163-L167
JournalAstrophysical Journal
Volume550
Issue number2 PART 2
DOIs
StatePublished - Apr 1 2001

Fingerprint

x rays
erg
imaging spectrometers
spectrometer
luminosity
lenses
mass to light ratios
radii
magnification
quasars
confidence
charge coupled devices
dark matter
absorbers
observatories
observatory
galaxies
solid state
estimates
modeling

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Chartas, G. ; Bautz, M. ; Garmire, G. ; Jones, C. ; Schneider, D. P. / Chandra observations of the gravitationally lensed system 2016+112. In: Astrophysical Journal. 2001 ; Vol. 550, No. 2 PART 2. pp. L163-L167.
@article{ea4e4476326c44689000d2a4bbd61e6d,
title = "Chandra observations of the gravitationally lensed system 2016+112",
abstract = "An observation of the gravitationally lensed system 2016+112 with the Chandra X-Ray Observatory has resolved a mystery regarding the proposed presence of a dark matter object in the lens plane of this system. The Chandra Advanced CCD Imaging Spectrometer observation has clearly detected the lensed images of 2016+112 with positions in good agreement with those reported in the optical and also detects 13 additional X-ray sources within a radius of 3′.5. Previous X-ray observations in the direction of 2016+112 with the ROSAT HRI and ASCA Solid-State Imaging Spectrometer have interpreted the X-ray data as arising from extended emission from a dark cluster. However, the present Chandra observation can account for all the X-ray emission as originating from the lensed images and additional point X-ray sources in the field. Thus, cluster parameters based on previous X-ray observations are unreliable. We place a 3 σ upper limit on the 2-10 keV flux and luminosity of the cluster of 1.6 × 10-14 ergs s-1 cm-2 and 1.7 × 1044 ergs s-1, respectively. We estimate an upper limit on the mass-to-light ratio within a radius of 800 h-150 kpc of M/Lv < 190 h50 (M/Lv)⊙. None of the additional point X-ray sources are associated with the galaxy cluster members recently detected in deep optical and IR observations. The lensed object is quite unusual, with reported narrow emission lines in the optical that suggest it may be a type 2 quasar. Our modeling of the X-ray spectrum of the lensed object implies that the column density of an intrinsic absorber must lie between 3 and 85 × 1022 cm-2 (3 σ confidence level). The 2-10 keV luminosity of the lensed object, corrected for the lens magnification effect and using the above range of intrinsic absorption, is from 3 × 1043 to 1.4 × 1044 ergs s-1.",
author = "G. Chartas and M. Bautz and G. Garmire and C. Jones and Schneider, {D. P.}",
year = "2001",
month = "4",
day = "1",
doi = "10.1086/319632",
language = "English (US)",
volume = "550",
pages = "L163--L167",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "2 PART 2",

}

Chartas, G, Bautz, M, Garmire, G, Jones, C & Schneider, DP 2001, 'Chandra observations of the gravitationally lensed system 2016+112', Astrophysical Journal, vol. 550, no. 2 PART 2, pp. L163-L167. https://doi.org/10.1086/319632

Chandra observations of the gravitationally lensed system 2016+112. / Chartas, G.; Bautz, M.; Garmire, G.; Jones, C.; Schneider, D. P.

In: Astrophysical Journal, Vol. 550, No. 2 PART 2, 01.04.2001, p. L163-L167.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Chandra observations of the gravitationally lensed system 2016+112

AU - Chartas, G.

AU - Bautz, M.

AU - Garmire, G.

AU - Jones, C.

AU - Schneider, D. P.

PY - 2001/4/1

Y1 - 2001/4/1

N2 - An observation of the gravitationally lensed system 2016+112 with the Chandra X-Ray Observatory has resolved a mystery regarding the proposed presence of a dark matter object in the lens plane of this system. The Chandra Advanced CCD Imaging Spectrometer observation has clearly detected the lensed images of 2016+112 with positions in good agreement with those reported in the optical and also detects 13 additional X-ray sources within a radius of 3′.5. Previous X-ray observations in the direction of 2016+112 with the ROSAT HRI and ASCA Solid-State Imaging Spectrometer have interpreted the X-ray data as arising from extended emission from a dark cluster. However, the present Chandra observation can account for all the X-ray emission as originating from the lensed images and additional point X-ray sources in the field. Thus, cluster parameters based on previous X-ray observations are unreliable. We place a 3 σ upper limit on the 2-10 keV flux and luminosity of the cluster of 1.6 × 10-14 ergs s-1 cm-2 and 1.7 × 1044 ergs s-1, respectively. We estimate an upper limit on the mass-to-light ratio within a radius of 800 h-150 kpc of M/Lv < 190 h50 (M/Lv)⊙. None of the additional point X-ray sources are associated with the galaxy cluster members recently detected in deep optical and IR observations. The lensed object is quite unusual, with reported narrow emission lines in the optical that suggest it may be a type 2 quasar. Our modeling of the X-ray spectrum of the lensed object implies that the column density of an intrinsic absorber must lie between 3 and 85 × 1022 cm-2 (3 σ confidence level). The 2-10 keV luminosity of the lensed object, corrected for the lens magnification effect and using the above range of intrinsic absorption, is from 3 × 1043 to 1.4 × 1044 ergs s-1.

AB - An observation of the gravitationally lensed system 2016+112 with the Chandra X-Ray Observatory has resolved a mystery regarding the proposed presence of a dark matter object in the lens plane of this system. The Chandra Advanced CCD Imaging Spectrometer observation has clearly detected the lensed images of 2016+112 with positions in good agreement with those reported in the optical and also detects 13 additional X-ray sources within a radius of 3′.5. Previous X-ray observations in the direction of 2016+112 with the ROSAT HRI and ASCA Solid-State Imaging Spectrometer have interpreted the X-ray data as arising from extended emission from a dark cluster. However, the present Chandra observation can account for all the X-ray emission as originating from the lensed images and additional point X-ray sources in the field. Thus, cluster parameters based on previous X-ray observations are unreliable. We place a 3 σ upper limit on the 2-10 keV flux and luminosity of the cluster of 1.6 × 10-14 ergs s-1 cm-2 and 1.7 × 1044 ergs s-1, respectively. We estimate an upper limit on the mass-to-light ratio within a radius of 800 h-150 kpc of M/Lv < 190 h50 (M/Lv)⊙. None of the additional point X-ray sources are associated with the galaxy cluster members recently detected in deep optical and IR observations. The lensed object is quite unusual, with reported narrow emission lines in the optical that suggest it may be a type 2 quasar. Our modeling of the X-ray spectrum of the lensed object implies that the column density of an intrinsic absorber must lie between 3 and 85 × 1022 cm-2 (3 σ confidence level). The 2-10 keV luminosity of the lensed object, corrected for the lens magnification effect and using the above range of intrinsic absorption, is from 3 × 1043 to 1.4 × 1044 ergs s-1.

UR - http://www.scopus.com/inward/record.url?scp=0035315310&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035315310&partnerID=8YFLogxK

U2 - 10.1086/319632

DO - 10.1086/319632

M3 - Article

AN - SCOPUS:0035315310

VL - 550

SP - L163-L167

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2 PART 2

ER -