%0 Generic %1 decarli2019kiloparsecscale %A Decarli, Roberto %A Dotti, Massimo %A Bañados, Eduardo %A Farina, Emanuele Paolo %A Walter, Fabian %A Carilli, Chris %A Fan, Xiaohui %A Mazzucchelli, Chiara %A Neeleman, Marcel %A Novak, Mladen %A Riechers, Dominik %A Strauss, Michael A. %A Venemans, Bram P. %A Yang, Yujin %A Wang, Ran %D 2019 %K ALMA high-z %T ALMA and HST kiloparsec-scale imaging of a quasar-galaxy merger at $z6.2$ %U http://arxiv.org/abs/1906.05308 %X We present kpc-scale ALMA and HST imaging of the quasar PJ308-21 at $z$=$6.2342$, tracing dust, gas (via the CII 158 $\mu$m line) and young stars. At a resolution of $\sim0.3''$ ($\approx1.7$ kpc), the system is resolved over $>4''$ ($>$20 kpc). In particular, it features a main component, identified to be the quasar host galaxy, centered on the accreting supermassive black hole; and two other extended components on the West and East side, one redshifted and the other blueshifted relative to the quasar. The CII emission of the entire system stretches over $>$1500 km/s along the line of sight. All the components of the system are observed in dust, CII, and rest-frame UV emission. The inferred CII luminosities (0.9-4.6)$10^9$ L$_ødot$, dust luminosities (0.15-2.6)$\times10^12$ L$_ødot$, and rest-frame UV luminosities (6.6-15)$\times10^10$ L$_ødot$, their ratios, and the implied gas/dust masses and star formation rates 11-290 M$_ødot$ yr$^-1$ are typical of high-redshift star-forming galaxies. A toy model of a single satellite galaxy that is tidally stripped by the interaction with the quasar host galaxy can account for the observed velocity and spatial extent of the two extended components. An outflow interpretation of the unique features in PJ308-21 is not supported by the data. PJ308-21 is thus one of the earliest galaxy mergers imaged at cosmic dawn.

@misc{decarli2019kiloparsecscale, abstract = {We present kpc-scale ALMA and HST imaging of the quasar PJ308-21 at $z$=$6.2342$, tracing dust, gas (via the [CII] 158 $\mu$m line) and young stars. At a resolution of $\sim0.3''$ ($\approx1.7$ kpc), the system is resolved over $>4''$ ($>$20 kpc). In particular, it features a main component, identified to be the quasar host galaxy, centered on the accreting supermassive black hole; and two other extended components on the West and East side, one redshifted and the other blueshifted relative to the quasar. The [CII] emission of the entire system stretches over $>$1500 km/s along the line of sight. All the components of the system are observed in dust, [CII], and rest-frame UV emission. The inferred [CII] luminosities [(0.9-4.6)$\times 10^9$ L$_\odot$], dust luminosities [(0.15-2.6)$\times10^{12}$ L$_\odot$], and rest-frame UV luminosities [(6.6-15)$\times10^{10}$ L$_\odot$], their ratios, and the implied gas/dust masses and star formation rates [11-290 M$_\odot$ yr$^{-1}$] are typical of high-redshift star-forming galaxies. A toy model of a single satellite galaxy that is tidally stripped by the interaction with the quasar host galaxy can account for the observed velocity and spatial extent of the two extended components. An outflow interpretation of the unique features in PJ308-21 is not supported by the data. PJ308-21 is thus one of the earliest galaxy mergers imaged at cosmic dawn.}, added-at = {2019-06-14T21:01:47.000+0200}, author = {Decarli, Roberto and Dotti, Massimo and Bañados, Eduardo and Farina, Emanuele Paolo and Walter, Fabian and Carilli, Chris and Fan, Xiaohui and Mazzucchelli, Chiara and Neeleman, Marcel and Novak, Mladen and Riechers, Dominik and Strauss, Michael A. and Venemans, Bram P. and Yang, Yujin and Wang, Ran}, biburl = {https://www.bibsonomy.org/bibtex/2853e0feec3c458c5d0f251caf451a555/heh15}, description = {ALMA and HST kiloparsec-scale imaging of a quasar-galaxy merger at $z\approx 6.2$}, interhash = {f2a56760ad527f09a098271554a36dd7}, intrahash = {853e0feec3c458c5d0f251caf451a555}, keywords = {ALMA high-z}, note = {cite arxiv:1906.05308Comment: 9 pages, 6 figures. Accepted for publication in ApJ}, timestamp = {2019-06-14T21:01:47.000+0200}, title = {ALMA and HST kiloparsec-scale imaging of a quasar-galaxy merger at $z\approx 6.2$}, url = {http://arxiv.org/abs/1906.05308}, year = 2019 }