We present a detailed study of a peculiar source detected in the COSMOS survey at z = 0.359. Source CXOC J100043.1+020637, also known as CID-42, has two compact optical sources embedded in the same galaxy. ′′ ′′ The distance between the two, measured in the HST/ACS image, is 0. 495 ± 0. 005 that, at the redshift of the source, corresponds to a projected separation of 2.46 ± 0.02 kpc. A large (∼1200 km s−1) velocity offset between the narrow and broad components of Hβ has been measured in three different optical spectra from the VLT/VIMOS and Magellan/IMACS instruments. CID-42 is also the only X-ray source in COSMOS, having in its X-ray spectra a strong redshifted broad absorption iron line and an iron emission line, drawing an inverted P-Cygni profile. The Chandra and XMM-Newton data show that the absorption line is variable in energy by ΔE = 500 eV over four years and that the absorber has to be highly ionized in order not to leave a signature in the soft X-ray spectrum. That these features—the morphology, the velocity offset, and the inverted P-Cygni profile—occur in the same source is unlikely to be a coincidence. We envisage two possible explanations, both exceptional, for this system: (1) a gravitational wave (GW) recoiling black hole (BH), caught 1–10 Myr after merging; or (2) a Type 1/Type 2 system in the same galaxy where the Type 1 is recoiling due to the slingshot effect produced by a triple BH system. The first possibility gives us a candidate GW recoiling BH with both spectroscopic and imaging signatures. In the second case, the X-ray absorption line can be explained as a BAL-like outflow from the foreground nucleus (a Type 2 AGN) at the rearer one (a Type 1 AGN), which illuminates the otherwise undetectable wind, giving us the first opportunity to show that fast winds are present in obscured active galactic nuclei (AGNs), and possibly universal in AGNs.

A Runaway Black Hole in COSMOS: Gravitational Wave or Slingshot Recoil? / Civano F.; Elvis M.; Lanzuisi G.; Jahnke K.; Zamorani G.; Blecha L.; Bongiorno A.; Brusa M.; Comastri A.; Hao H.; Leauthaud A.; Loeb A.; Mignoli M.; Mainieri V.; Piconcelli E.; Salvato M.; Scoville N.; Trump J.; Vignali C.; Aldcroft T.; Bolzonella M.; Bressert E.; Finoguenov A.; Fruscione A.; Koekemoer A. M.; Cappelluti N.; Fiore F.; Giodini S.; Gilli R.; Impey C. D.; Lilly S. J.; Lusso E.; Puccetti S.; Silverman J. D.; Aussel H.; Capak P.; Frayer D.; Le Floc'h E.; McCracken H. J.; Sanders D. B.; Schiminovich D.; Taniguchi Y.. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - STAMPA. - 717:(2010), pp. 209-222. [10.1088/0004-637X/717/1/209]

A Runaway Black Hole in COSMOS: Gravitational Wave or Slingshot Recoil?

LANZUISI, GIORGIO;BRUSA, MARCELLA;VIGNALI, CRISTIAN;LUSSO, ELISABETA;
2010

Abstract

We present a detailed study of a peculiar source detected in the COSMOS survey at z = 0.359. Source CXOC J100043.1+020637, also known as CID-42, has two compact optical sources embedded in the same galaxy. ′′ ′′ The distance between the two, measured in the HST/ACS image, is 0. 495 ± 0. 005 that, at the redshift of the source, corresponds to a projected separation of 2.46 ± 0.02 kpc. A large (∼1200 km s−1) velocity offset between the narrow and broad components of Hβ has been measured in three different optical spectra from the VLT/VIMOS and Magellan/IMACS instruments. CID-42 is also the only X-ray source in COSMOS, having in its X-ray spectra a strong redshifted broad absorption iron line and an iron emission line, drawing an inverted P-Cygni profile. The Chandra and XMM-Newton data show that the absorption line is variable in energy by ΔE = 500 eV over four years and that the absorber has to be highly ionized in order not to leave a signature in the soft X-ray spectrum. That these features—the morphology, the velocity offset, and the inverted P-Cygni profile—occur in the same source is unlikely to be a coincidence. We envisage two possible explanations, both exceptional, for this system: (1) a gravitational wave (GW) recoiling black hole (BH), caught 1–10 Myr after merging; or (2) a Type 1/Type 2 system in the same galaxy where the Type 1 is recoiling due to the slingshot effect produced by a triple BH system. The first possibility gives us a candidate GW recoiling BH with both spectroscopic and imaging signatures. In the second case, the X-ray absorption line can be explained as a BAL-like outflow from the foreground nucleus (a Type 2 AGN) at the rearer one (a Type 1 AGN), which illuminates the otherwise undetectable wind, giving us the first opportunity to show that fast winds are present in obscured active galactic nuclei (AGNs), and possibly universal in AGNs.
2010
A Runaway Black Hole in COSMOS: Gravitational Wave or Slingshot Recoil? / Civano F.; Elvis M.; Lanzuisi G.; Jahnke K.; Zamorani G.; Blecha L.; Bongiorno A.; Brusa M.; Comastri A.; Hao H.; Leauthaud A.; Loeb A.; Mignoli M.; Mainieri V.; Piconcelli E.; Salvato M.; Scoville N.; Trump J.; Vignali C.; Aldcroft T.; Bolzonella M.; Bressert E.; Finoguenov A.; Fruscione A.; Koekemoer A. M.; Cappelluti N.; Fiore F.; Giodini S.; Gilli R.; Impey C. D.; Lilly S. J.; Lusso E.; Puccetti S.; Silverman J. D.; Aussel H.; Capak P.; Frayer D.; Le Floc'h E.; McCracken H. J.; Sanders D. B.; Schiminovich D.; Taniguchi Y.. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - STAMPA. - 717:(2010), pp. 209-222. [10.1088/0004-637X/717/1/209]
Civano F.; Elvis M.; Lanzuisi G.; Jahnke K.; Zamorani G.; Blecha L.; Bongiorno A.; Brusa M.; Comastri A.; Hao H.; Leauthaud A.; Loeb A.; Mignoli M.; Mainieri V.; Piconcelli E.; Salvato M.; Scoville N.; Trump J.; Vignali C.; Aldcroft T.; Bolzonella M.; Bressert E.; Finoguenov A.; Fruscione A.; Koekemoer A. M.; Cappelluti N.; Fiore F.; Giodini S.; Gilli R.; Impey C. D.; Lilly S. J.; Lusso E.; Puccetti S.; Silverman J. D.; Aussel H.; Capak P.; Frayer D.; Le Floc'h E.; McCracken H. J.; Sanders D. B.; Schiminovich D.; Taniguchi Y.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/89545
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