File Download
There are no files associated with this item.
Links for fulltext
(May Require Subscription)
- Publisher Website: 10.1046/j.1365-8711.2000.03049.x
- Scopus: eid_2-s2.0-0041905279
- WOS: WOS:000084867400010
- Find via
Supplementary
- Citations:
- Appears in Collections:
Article: Three quasars from a survey of strong 25-μm emitters
Title | Three quasars from a survey of strong 25-μm emitters |
---|---|
Authors | |
Keywords | Quasars: individual: Z05558-5008 Infrared: galaxies Galaxies: fundamental parameters Quasars: emission lines Quasars: individual: F21382-2659 Quasars: individual: Z06367-6845 |
Issue Date | 2000 |
Citation | Monthly Notices of the Royal Astronomical Society, 2000, v. 311, n. 3, p. 541-554 How to Cite? |
Abstract | We have carried out a spectroscopic survey of 750 sources that are strong 25-μm emitters from the IRAS Faint Source data base. Many of these sources are previously unknown active galactic nuclei including new IRAS quasars, three of which we describe here: F21382-2659, Z06367-6845 and Z05558-5008. They are all radio and X-ray quiet, and compared to the known IRAS quasars they have similar 25-μm luminosities, L(25 μm), but lower values of L(25 μm)/L(B). Their F(25 μm)/F(60 μm) IRAS colours lie in the range 0.33 to 1.08, indicating the presence of relatively warm dust, presumably in a dusty torus surrounding the central source, and with temperatures similar to those of the known IRAS quasars. The quasar with the warmest dust, F21382-2659, exhibits broad (full width at half-maximum ∼4000 km s-1) asymmetric Balmer lines with Hγ having an opposite asymmetry to the other broad lines; also Hβ (only) is double-peaked. Fe II is very weak in F21382-2659 but strong in the other two quasars, and the anticorrelation between Fe II and [O III] holds as anticipated. Two of the quasars are unpolarized: although F21382-2659 is optically polarized (2.1 per cent at 4950 Å), we argue that this provides little insight into the orientation of its dust torus relative to the line of sight. |
Persistent Identifier | http://hdl.handle.net/10722/208823 |
ISSN | 2023 Impact Factor: 4.7 2023 SCImago Journal Rankings: 1.621 |
ISI Accession Number ID |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Wolstencroft, Ramon D. | - |
dc.contributor.author | Parker, Quentin A. | - |
dc.contributor.author | Lonsdale, Carol J. | - |
dc.contributor.author | Scarrott, S. M. | - |
dc.date.accessioned | 2015-03-23T02:01:49Z | - |
dc.date.available | 2015-03-23T02:01:49Z | - |
dc.date.issued | 2000 | - |
dc.identifier.citation | Monthly Notices of the Royal Astronomical Society, 2000, v. 311, n. 3, p. 541-554 | - |
dc.identifier.issn | 0035-8711 | - |
dc.identifier.uri | http://hdl.handle.net/10722/208823 | - |
dc.description.abstract | We have carried out a spectroscopic survey of 750 sources that are strong 25-μm emitters from the IRAS Faint Source data base. Many of these sources are previously unknown active galactic nuclei including new IRAS quasars, three of which we describe here: F21382-2659, Z06367-6845 and Z05558-5008. They are all radio and X-ray quiet, and compared to the known IRAS quasars they have similar 25-μm luminosities, L(25 μm), but lower values of L(25 μm)/L(B). Their F(25 μm)/F(60 μm) IRAS colours lie in the range 0.33 to 1.08, indicating the presence of relatively warm dust, presumably in a dusty torus surrounding the central source, and with temperatures similar to those of the known IRAS quasars. The quasar with the warmest dust, F21382-2659, exhibits broad (full width at half-maximum ∼4000 km s-1) asymmetric Balmer lines with Hγ having an opposite asymmetry to the other broad lines; also Hβ (only) is double-peaked. Fe II is very weak in F21382-2659 but strong in the other two quasars, and the anticorrelation between Fe II and [O III] holds as anticipated. Two of the quasars are unpolarized: although F21382-2659 is optically polarized (2.1 per cent at 4950 Å), we argue that this provides little insight into the orientation of its dust torus relative to the line of sight. | - |
dc.language | eng | - |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society | - |
dc.subject | Quasars: individual: Z05558-5008 | - |
dc.subject | Infrared: galaxies | - |
dc.subject | Galaxies: fundamental parameters | - |
dc.subject | Quasars: emission lines | - |
dc.subject | Quasars: individual: F21382-2659 | - |
dc.subject | Quasars: individual: Z06367-6845 | - |
dc.title | Three quasars from a survey of strong 25-μm emitters | - |
dc.type | Article | - |
dc.description.nature | link_to_OA_fulltext | - |
dc.identifier.doi | 10.1046/j.1365-8711.2000.03049.x | - |
dc.identifier.scopus | eid_2-s2.0-0041905279 | - |
dc.identifier.volume | 311 | - |
dc.identifier.issue | 3 | - |
dc.identifier.spage | 541 | - |
dc.identifier.epage | 554 | - |
dc.identifier.isi | WOS:000084867400010 | - |
dc.identifier.issnl | 0035-8711 | - |