Serendipitous Discovery of a Physical Binary Quasar at z=1.76
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Serendipitous Discovery of a Physical Binary Quasar at z=1.76. / Altamura, E.; Brennan, S.; Lesniewska, A.; Pinter, V.; dos Reis, S. N.; Pursimo, T.; Fynbo, J. P. U.; Geier, S.; Heintz, K. E.; Moller, P.
In: Astronomical Journal, Vol. 159, No. 3, 122, 21.02.2020.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Serendipitous Discovery of a Physical Binary Quasar at z=1.76
AU - Altamura, E.
AU - Brennan, S.
AU - Lesniewska, A.
AU - Pinter, V.
AU - dos Reis, S. N.
AU - Pursimo, T.
AU - Fynbo, J. P. U.
AU - Geier, S.
AU - Heintz, K. E.
AU - Moller, P.
PY - 2020/2/21
Y1 - 2020/2/21
N2 - Binary quasars are extremely rare objects, used to investigate clustering on very small scales at different redshifts. The cases where the two quasar components are gravitationally bound, known as physical binary quasars, can also exhibit enhanced astrophysical activity and therefore are of particular scientific interest. Here we present the serendipitous discovery of a physical pair of quasars with an angular separation of Delta(theta) = (8.76 +/- 0.11)''. The redshifts of the two quasars are consistent within the errors and measured as z = (1.76 +/- 0.01). Under the motivated assumption that the pair does not arise from a single gravitationally lensed quasar, the resulting projected physical separation was estimated as (76 +/- 1) kpc. For both targets we detected Si IV, C IV, C III], and Mg II emission lines. However, the two quasars show significantly different optical colors, one being among the most reddened quasars at z > 1.5 and the other with colors consistent with typical quasar colors at the same redshift. Therefore it is ruled out that the sources are a lensed system. This is our second serendipitous discovery of a pair of two quasars with different colors, having a separation
AB - Binary quasars are extremely rare objects, used to investigate clustering on very small scales at different redshifts. The cases where the two quasar components are gravitationally bound, known as physical binary quasars, can also exhibit enhanced astrophysical activity and therefore are of particular scientific interest. Here we present the serendipitous discovery of a physical pair of quasars with an angular separation of Delta(theta) = (8.76 +/- 0.11)''. The redshifts of the two quasars are consistent within the errors and measured as z = (1.76 +/- 0.01). Under the motivated assumption that the pair does not arise from a single gravitationally lensed quasar, the resulting projected physical separation was estimated as (76 +/- 1) kpc. For both targets we detected Si IV, C IV, C III], and Mg II emission lines. However, the two quasars show significantly different optical colors, one being among the most reddened quasars at z > 1.5 and the other with colors consistent with typical quasar colors at the same redshift. Therefore it is ruled out that the sources are a lensed system. This is our second serendipitous discovery of a pair of two quasars with different colors, having a separation
KW - DIGITAL-SKY-SURVEY
KW - EFFICIENT PHOTOMETRIC SELECTION
KW - GRAVITATIONALLY LENSED QUASAR
KW - SEPARATION
KW - EXCESS
KW - DUST
U2 - 10.3847/1538-3881/ab6e67
DO - 10.3847/1538-3881/ab6e67
M3 - Journal article
VL - 159
JO - The Astronomical Journal
JF - The Astronomical Journal
SN - 0004-6256
IS - 3
M1 - 122
ER -
ID: 247441462