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Title: CHANDRA HIGH-RESOLUTION OBSERVATIONS OF CID-42, A CANDIDATE RECOILING SUPERMASSIVE BLACK HOLE

Abstract

We present Chandra High Resolution Camera observations of CID-42, a candidate recoiling supermassive black hole (SMBH) at z = 0.359 in the COSMOS survey. CID-42 shows two optical compact sources resolved in the HST/ACS image embedded in the same galaxy structure and a velocity offset of {approx}1300 km s{sup -1} between the H{beta} broad and narrow emission line, as presented by Civano et al. Two scenarios have been proposed to explain the properties of CID-42: a gravitational wave (GW) recoiling SMBH and a double Type 1/Type 2 active galactic nucleus (AGN) system, where one of the two is recoiling because of slingshot effect. In both scenarios, one of the optical nuclei hosts an unobscured AGN, while the other one, either an obscured AGN or a star-forming compact region. The X-ray Chandra data allow us to unambiguously resolve the X-ray emission and unveil the nature of the two optical sources in CID-42. We find that only one of the optical nuclei is responsible for the whole X-ray unobscured emission observed and a 3{sigma} upper limit on the flux of the second optical nucleus is measured. The upper limit on the X-ray luminosity plus the analysis of the multiwavelength spectral energy distributionmore » indicate the presence of a star-forming region in the second source rather than an obscured SMBH, thus favoring the GW recoil scenario. However, the presence of a very obscured SMBH cannot be fully ruled out. A new X-ray feature, in a SW direction with respect to the main source, is discovered and discussed.« less

Authors:
; ; ; ; ;  [1]; ;  [2]; ;  [3]; ;  [4]; ;  [5];  [6];  [7];  [8];  [9]
  1. Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, MA 02138 (United States)
  2. Max-Planck-Institut fuer extraterrestrische Physik, Giessenbachstrasse 1, 85748 Garching (Germany)
  3. Department of Astronomy, Harvard University, 60 Garden Street, Cambridge, MA 02138 (United States)
  4. INAF-Osservatorio Astronomico di Bologna, Via Ranzani 1, Bologna 40127 (Italy)
  5. Max-Planck-Institute for Plasma Physics, Excellence Cluster, Boltzmannstrass 2, 85748 Garching (Germany)
  6. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States)
  7. ESO, Karl-Schwarzschild-Strasse 2, 85748 Garching (Germany)
  8. INAF-Osservatorio Astronomico di Roma, Via Frascati 33, Monteporzio-Catone 00040 (Italy)
  9. Dipartimento di Astronomia, Universita di Bologna, Via Ranzani 1, Bologna 40127 (Italy)
Publication Date:
OSTI Identifier:
22037084
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 752; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTRONOMY; ASTROPHYSICS; BLACK HOLES; CAMERAS; ENERGY SPECTRA; GALAXIES; GALAXY NUCLEI; GRAVITATIONAL WAVES; IMAGES; LUMINOSITY; PHOTON EMISSION; RECOILS; RESOLUTION; STARS; UNIVERSE; VELOCITY; X RADIATION

Citation Formats

Civano, F., Elvis, M., Lanzuisi, G., Aldcroft, T., Trichas, M., Fruscione, A., Bongiorno, A., Brusa, M., Blecha, L., Loeb, A., Comastri, A., Gilli, R., Salvato, M., Komossa, S., Koekemoer, A., Mainieri, V., Piconcelli, E., and Vignali, C. CHANDRA HIGH-RESOLUTION OBSERVATIONS OF CID-42, A CANDIDATE RECOILING SUPERMASSIVE BLACK HOLE. United States: N. p., 2012. Web. doi:10.1088/0004-637X/752/1/49.
Civano, F., Elvis, M., Lanzuisi, G., Aldcroft, T., Trichas, M., Fruscione, A., Bongiorno, A., Brusa, M., Blecha, L., Loeb, A., Comastri, A., Gilli, R., Salvato, M., Komossa, S., Koekemoer, A., Mainieri, V., Piconcelli, E., & Vignali, C. CHANDRA HIGH-RESOLUTION OBSERVATIONS OF CID-42, A CANDIDATE RECOILING SUPERMASSIVE BLACK HOLE. United States. doi:10.1088/0004-637X/752/1/49.
Civano, F., Elvis, M., Lanzuisi, G., Aldcroft, T., Trichas, M., Fruscione, A., Bongiorno, A., Brusa, M., Blecha, L., Loeb, A., Comastri, A., Gilli, R., Salvato, M., Komossa, S., Koekemoer, A., Mainieri, V., Piconcelli, E., and Vignali, C. Sun . "CHANDRA HIGH-RESOLUTION OBSERVATIONS OF CID-42, A CANDIDATE RECOILING SUPERMASSIVE BLACK HOLE". United States. doi:10.1088/0004-637X/752/1/49.
@article{osti_22037084,
title = {CHANDRA HIGH-RESOLUTION OBSERVATIONS OF CID-42, A CANDIDATE RECOILING SUPERMASSIVE BLACK HOLE},
author = {Civano, F. and Elvis, M. and Lanzuisi, G. and Aldcroft, T. and Trichas, M. and Fruscione, A. and Bongiorno, A. and Brusa, M. and Blecha, L. and Loeb, A. and Comastri, A. and Gilli, R. and Salvato, M. and Komossa, S. and Koekemoer, A. and Mainieri, V. and Piconcelli, E. and Vignali, C.},
abstractNote = {We present Chandra High Resolution Camera observations of CID-42, a candidate recoiling supermassive black hole (SMBH) at z = 0.359 in the COSMOS survey. CID-42 shows two optical compact sources resolved in the HST/ACS image embedded in the same galaxy structure and a velocity offset of {approx}1300 km s{sup -1} between the H{beta} broad and narrow emission line, as presented by Civano et al. Two scenarios have been proposed to explain the properties of CID-42: a gravitational wave (GW) recoiling SMBH and a double Type 1/Type 2 active galactic nucleus (AGN) system, where one of the two is recoiling because of slingshot effect. In both scenarios, one of the optical nuclei hosts an unobscured AGN, while the other one, either an obscured AGN or a star-forming compact region. The X-ray Chandra data allow us to unambiguously resolve the X-ray emission and unveil the nature of the two optical sources in CID-42. We find that only one of the optical nuclei is responsible for the whole X-ray unobscured emission observed and a 3{sigma} upper limit on the flux of the second optical nucleus is measured. The upper limit on the X-ray luminosity plus the analysis of the multiwavelength spectral energy distribution indicate the presence of a star-forming region in the second source rather than an obscured SMBH, thus favoring the GW recoil scenario. However, the presence of a very obscured SMBH cannot be fully ruled out. A new X-ray feature, in a SW direction with respect to the main source, is discovered and discussed.},
doi = {10.1088/0004-637X/752/1/49},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 752,
place = {United States},
year = {2012},
month = {6}
}