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1. ACS Virgo Cluster Survey. III. M87
ID:
ivo://CDS.VizieR/J/ApJ/613/279
Title:
ACS Virgo Cluster Survey. III. M87
Short Name:
J/ApJ/613/279
Date:
21 Oct 2021
Publisher:
CDS
Description:
The ACIS instrument on board the Chandra X-Ray Observatory has been used to carry out the first systematic study of low-mass X-ray binaries (LMXBs) in M87, the giant elliptical galaxy near the dynamical center of the Virgo Cluster. These images - with a total exposure time of 154 ks - are the deepest X-ray observations yet obtained of M87. We identify 174 X-ray point sources, of which 150 are likely LMXBs.
2. Chandra compact binaries in 47 Tuc
ID:
ivo://CDS.VizieR/J/other/Sci/292.2290
Title:
Chandra compact binaries in 47 Tuc
Short Name:
J/other/Sci/292.
Date:
21 Oct 2021
Publisher:
CDS
Description:
We have obtained high-resolution (<~1") deep X-ray images of the globular cluster 47 Tucanae (NGC 104) with the Chandra X-ray Observatory to study the population of compact binaries in the high stellar density core. A 70-kilosecond exposure of the cluster reveals a centrally concentrated population of faint (L_X_~10^30-33^ergs/s) X-ray sources, with at least 108 located within the central 2'x2.5' and >~half with L_X_<~10^30.5^ergs/s. All 15 millisecond pulsars (MSPs) recently located precisely by radio observations are identified, though 2 are unresolved by Chandra. The X-ray spectral and temporal characteristics, as well as initial optical identifications with the Hubble Space Telescope, suggest that >~50 percent are MSPs, about 30 percent are accreting white dwarfs, about 15 percent are main-sequence binaries in flare outbursts, and only two to three are quiescent low-mass X-ray binaries containing neutron stars, the conventional progenitors of MSPs. An upper limit of about 470 times the mass of the sun is derived for the mass of an accreting central black hole in the cluster. These observations provide the first X-ray ``color-magnitude'' diagram for a globular cluster and census of its compact object and binary population. Observations were made on UT 16.31 - 17.22 March, 2000.
3. Chandra X-ray sources of NGC 1068
ID:
ivo://CDS.VizieR/J/ApJ/591/138
Title:
Chandra X-ray sources of NGC 1068
Short Name:
J/ApJ/591/138
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present an analysis of the compact X-ray source population in the Seyfert 2 galaxy NGC 1068, imaged with a 50ks Chandra observation. We find a total of 84 compact sources on the S3 chip, of which 66 are located within the 25.0B-mag/arcsec^2^ isophote of the galactic disk of NGC 1068. Spectra have been obtained for the 21 sources with at least 50 counts and modeled with both multicolor disk blackbody and power-law models.

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