Discovery of H alpha absorption in the unusual broad absorption line quasar SDSS J083942.11+380526.3
| dc.creator | Aoki, Kentaro | |
| dc.creator | Iwata, Ikuru | |
| dc.creator | Ohta, Kouji | |
| dc.creator | Ando, Masataka | |
| dc.creator | Akiyama, Masayuki | |
| dc.creator | Tamura, Naoyuki | |
| dc.date | 2006-07-04 | |
| dc.date.accessioned | 2026-07-07T10:39:28Z | |
| dc.date.available | 2026-07-07T10:39:28Z | |
| dc.description | We discovered an H alpha absorption in a broad H alpha emission line of an unusual broad absorption line quasar, SDSS J083942.11+380526.3 at z=2.318, by near-infrared spectroscopy with the Cooled Infrared Spectrograph and Camera for OHS (CISCO) on the Subaru telescope. The Presence of non-stellar H alpha absorption is known only in the Seyfert galaxy NGC 4151 to date, thus our discovery is the first case for quasars. The H alpha absorption line is blueshifted by 520 km/s relative to the H alpha emission line, and its redshift almost coincides with those of UV low-ionization metal absorption lines. The width of the H alpha absorption (~ 340 km/s) is similar to those of the UV low-ionization absorption lines. These facts suggest that the H alpha and the low-ionization metal absorption lines are produced by the same low-ionization gas which has a substantial amount of neutral gas. The column density of the neutral hydrogen is estimated to be ~ 10^18 cm^-2 by assuming a gas temperature of 10,000 K from the analysis of the curve of growth. The continuum spectrum is reproduced by a reddened (E(B-V) ~ 0.15 mag for the SMC-like reddening law) composite quasar spectrum. Furthermore, the UV spectrum of SDSS J083942.11+380526.3 shows a remarkable similarity to that of NGC 4151 in its low state, suggesting the physical condition of the absorber in SDSS J083942.11+380526.3 is similar to that of NGC 4151 in the low state. As proposed for NGC 4151, SDSS J083942.11+380526.3 may be also seen through the close direction of the surface of the obscuring torus. | |
| dc.description | Accepted for publication in ApJ | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0607036 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0607036 | |
| dc.identifier | Astrophys.J.651:84-92,2006 | |
| dc.identifier | doi:10.1086/507438 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/181040 | |
| dc.subject | Astrophysics | |
| dc.title | Discovery of H alpha absorption in the unusual broad absorption line quasar SDSS J083942.11+380526.3 | |
| dc.type | text |