|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'504'928
Articles rated: 2609
25 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
A Polarimetric Search for Hidden Quasars in Three Radio Selected Ultraluminous Infrared Galaxies | | Hien D. Tran
; M. S. Brotherton
; S. A. Stanford
; Wil van Breugel
; A. Dey
; D. Stern
; R. Antonucci
; | | Date: |
5 Dec 1998 | | Subject: | astro-ph | | Affiliation: | IGPP/LLNL), A. Dey (NOAO), D. Stern (UC Berkeley), R. Antonucci (UC Santa Barbara | | Abstract: | We have carried out a spectropolarimetric search for hidden broad-line quasars in three ultraluminous infrared galaxies (ULIRGs) discovered in the positional correlations between sources detected in deep radio surveys and the IRAS Faint Source Catalog. Only the high-ionization Seyfert 2 galaxy TF J1736+1122 is highly polarized, displaying a broad-line spectrum visible in polarized light. The other two objects, TF J1020+6436 and FF J1614+3234, display spectra dominated by a population of young (A-type) stars similar to those of ``E + A’’ galaxies. They are unpolarized, showing no sign of hidden broad-line regions. The presence of young starburst components in all three galaxies indicates that the ULIRG phenomenon encompasses both AGN and starburst activity, but the most energetic ULIRGs do not necessarily harbor ``buried quasars’’. We find that a luminous infrared galaxy is most likely to host an obscured quasar if it exhibits a high-ionization ([O III] 5007/Hb >~ 5) spectrum typical of a ``classic’’ Seyfert 2 galaxy with little or no Balmer absorption lines, is ``ultraluminous’’ (L_IR >~ 10^12 L_sun), and has a ``warm’’ IR color (f_25/f_60 >~ 0.25). The detection of hidden quasars in this group but not in the low-ionization, starburst-dominated ULIRGs (classified as LINERs or H II galaxies) may indicate an evolutionary connection, with the latter being found in younger systems. | | Source: | arXiv, astro-ph/9812110 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER