Skip to main content
We gratefully acknowledge support from the Simons Foundation, member institutions, and all contributors. Donate
arXiv logo
Cornell University Logo

Astrophysics

arXiv:astro-ph/0504423 (astro-ph)
[Submitted on 19 Apr 2005]

Title:The Detection of Silicate Emission from Quasars at 10 and 18 Microns

Authors:Lei Hao (1), H. W. W. Spoon (1), G. C. Sloan (1), J. A. Marshall (1), L. Armus (2), A. G. G. M. Tielens (3), B. Sargent (4), I. M. van Bemmel (5), V. Charmandaris (1,6), D. W. Weedman (1), J. R. Houck (1) ((1) Cornell (2) SSC (3) SRON, Netherland (4) Rochester (5) STScI (6) University of Crete)
View PDF
Abstract: We report the spectroscopic detection of silicate emission at 10 and 18 microns in five PG quasars, the first detection of these two features in galaxies outside the Local Group. This finding is consistent with the unification model for Active Galactic Nuclei (AGNs), which predicts that an AGN torus seen pole-on should show a silicate emission feature in the mid-infrared. The strengths of the detected silicate emission features range from 0.12 to 1.25 times the continuum at 10 microns and from 0.20 to 0.79 times the continuum at 18 microns. The silicate grain temperatures inferred from the ratio of 18-to-10 micron silicate features under the assumption of optically thin emission range from 140 to 220K.
Comments: 4 pages, including 2 tables and 3 figures. Accepted by ApJL
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0504423
  (or arXiv:astro-ph/0504423v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0504423
Journal reference: Astrophys.J. 625 (2005) L75-L78
Related DOI: https://doi.org/10.1086/431227

Submission history

From: Lei Hao [view email]
[v1] Tue, 19 Apr 2005 20:00:01 UTC (89 KB)
Full-text links:

Access Paper:

  • View PDF
  • TeX Source
  • Other Formats
view license
Current browse context:
astro-ph
< prev   |   next >
new | recent | 2005-04

References & Citations

export BibTeX citation

Bookmark

BibSonomy logo Reddit logo

Bibliographic and Citation Tools

Bibliographic Explorer (What is the Explorer?)
Connected Papers (What is Connected Papers?)
Litmaps (What is Litmaps?)
scite Smart Citations (What are Smart Citations?)

Code, Data and Media Associated with this Article

alphaXiv (What is alphaXiv?)
CatalyzeX Code Finder for Papers (What is CatalyzeX?)
DagsHub (What is DagsHub?)
Gotit.pub (What is GotitPub?)
Hugging Face (What is Huggingface?)
Papers with Code (What is Papers with Code?)
ScienceCast (What is ScienceCast?)

Demos

Replicate (What is Replicate?)
Hugging Face Spaces (What is Spaces?)
TXYZ.AI (What is TXYZ.AI?)

Recommenders and Search Tools

Influence Flower (What are Influence Flowers?)
CORE Recommender (What is CORE?)
IArxiv Recommender (What is IArxiv?)

arXivLabs: experimental projects with community collaborators

arXivLabs is a framework that allows collaborators to develop and share new arXiv features directly on our website.

Both individuals and organizations that work with arXivLabs have embraced and accepted our values of openness, community, excellence, and user data privacy. arXiv is committed to these values and only works with partners that adhere to them.

Have an idea for a project that will add value for arXiv's community? Learn more about arXivLabs.

Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?)