A1 Refereed original research article in a scientific journal
PROBING THE NATURE OF THE MASSIVE BLACK HOLE BINARY CANDIDATE SDSS J1536+0441
Authors: Decarli R, Dotti M, Falomo R, Treves A, Colpi M, Kotilainen JK, Montuori C, Uslenghi M
Publisher: IOP PUBLISHING LTD
Publication year: 2009
Journal name in sourceASTROPHYSICAL JOURNAL LETTERS
Journal acronym: ASTROPHYS J LETT
Volume: 703
Issue: 1
First page : L76
Last page: L80
Number of pages: 5
DOI: https://doi.org/10.1088/0004-637X/703/1/L76
Abstract
We present an imaging study of the black hole binary candidate SDSS J1536+0441 (z approximate to 0.3893), based on deep, high-resolution VzK images collected at the ESO/Very Large Telescope. The images clearly show an asymmetric elongation, indicating the presence of a companion source at similar to 1 '' (approximate to 5 kpc projected distance) east from the quasar. The host galaxy of the quasar is marginally resolved. We find that the companion source is a luminous galaxy, the light profile of which suggests the presence of an unresolved, faint nucleus (either an obscured active galactic nucleus or a compact stellar bulge). The study of the environment around the quasar indicates the occurrence of a significant overdensity of galaxies with a redshift compatible with z approximate to 0.4. This suggests that it resides in a moderately rich cluster of galaxies.
We present an imaging study of the black hole binary candidate SDSS J1536+0441 (z approximate to 0.3893), based on deep, high-resolution VzK images collected at the ESO/Very Large Telescope. The images clearly show an asymmetric elongation, indicating the presence of a companion source at similar to 1 '' (approximate to 5 kpc projected distance) east from the quasar. The host galaxy of the quasar is marginally resolved. We find that the companion source is a luminous galaxy, the light profile of which suggests the presence of an unresolved, faint nucleus (either an obscured active galactic nucleus or a compact stellar bulge). The study of the environment around the quasar indicates the occurrence of a significant overdensity of galaxies with a redshift compatible with z approximate to 0.4. This suggests that it resides in a moderately rich cluster of galaxies.
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