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Keck high-resolution spectroscopy of Mrk 335: constraints on the number of emitting clouds in the broad-line region

Arav, Nahum and Barlow, Tom A. and Laor, Ari and Blandford, Roger D. (1997) Keck high-resolution spectroscopy of Mrk 335: constraints on the number of emitting clouds in the broad-line region. Monthly Notices of the Royal Astronomical Society, 288 (4). pp. 1015-1021. ISSN 0035-8711. https://resolver.caltech.edu/CaltechAUTHORS:20200720-124521406

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Abstract

We present high-resolution (∼6 km s⁻¹), high signal-to-noise ratio (−400 at Hα line centre) spectroscopy of Mrk 335. Cross-correlation (CC) analysis of the data yields a lower limit of ∼ 3 × 10⁶ for the number of emitting clouds in the broad-line region (BLR) of this object. This limit is applicable for clouds with T=2 × 10⁴ K and an optical depth of ∼ 10⁴ in their Hα line. The result is obtained from the absence of a CC signal in the data and from extensive Monte Carlo simulations that show the minimum number of clouds necessary in order to prevent the creation of a detectable CC signal. The simulations can be used to test any BLR model which is based on a contribution from discrete sources provided that the individual emission profile of the sources and their distribution are given. Current BLR models based on stellar atmospheres of bloated stars can be ruled out, unless the linewidth of an individual star exceeds 100 km s⁻¹. The lower limit on the number of emitting clouds also provides constraints on traditional photoionization models for a system of clouds.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1093/mnras/288.4.1015DOIArticle
http://adsabs.harvard.edu/doi/10.1093/mnras/288.4.1015ADSArticle
ORCID:
AuthorORCID
Blandford, Roger D.0000-0002-1854-5506
Additional Information:© 1997 Royal Astronomical Society. Provided by the NASA Astrophysics Data System. Accepted 1997 March 7. Received 1996 September 17. We thank Tom Bida for acquiring these observations and S. Vogt for leading the construction of the HIRES spectrograph. NA and RDB acknowledge support from NSF grants 92-23370 and 95-29170. AL acknowledges support from the E. and J. Bishop research fund, and from the Milton and Lillian Edwards academic lectureship fund.
Group:TAPIR
Funders:
Funding AgencyGrant Number
NSF92-23370
NSF95-29170
E. and J. Bishop Research FundUNSPECIFIED
Milton and Lillian Edwards Academic Lectureship FundUNSPECIFIED
Subject Keywords:techniques: spectroscopic, galaxies: individual: Mrk 335, quasars: emission lines, galaxies: Seyfert
Issue or Number:4
Record Number:CaltechAUTHORS:20200720-124521406
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200720-124521406
Official Citation:Nahum Arav, Tom A. Barlow, Ari Laor, Roger D. Blandford, Keck high-resolution spectroscopy of Mrk 335: constraints on the number of emitting clouds in the broad-line region, Monthly Notices of the Royal Astronomical Society, Volume 288, Issue 4, July 1997, Pages 1015–1021, https://doi.org/10.1093/mnras/288.4.1015
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104449
Collection:CaltechAUTHORS
Deposited By: Rebecca Minjarez
Deposited On:21 Jul 2020 15:38
Last Modified:21 Jul 2020 15:38

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