The Effect of Noise on the Dust Temperature-Spectral Index Correlation

DSpace/Manakin Repository

The Effect of Noise on the Dust Temperature-Spectral Index Correlation

Citable link to this page

. . . . . .

Title: The Effect of Noise on the Dust Temperature-Spectral Index Correlation
Author: Shetty, Rahul; Kauffmann, Jens; Schnee, Scott; Goodman, Alyssa A.

Note: Order does not necessarily reflect citation order of authors.

Citation: Shetty, Rahul, Jens Kauffmann, Scott Schnee and Alyssa A. Goodman. 2009. The effect of noise on the dust temperature-spectral index correlation. Astrophysical Journal 696(1): 676-680.
Full Text & Related Files:
Abstract: We investigate how uncertainties in flux measurements affect the results from modified blackbody spectral energy distribution (SED) fits. We show that an inverse correlation between the dust temperature T and spectral index β naturally arises from least-squares fits due to the uncertainties, even for sources with a single T and \(\beta\). Fitting SEDs to noisy fluxes solely in the Rayleigh–Jeans regime produces unreliable T and \(\beta\) estimates. Thus, for long wavelength observations \((\lambda > \sim 200 \mu m)\), or for warm sources \((T >\sim 60 K)\), it becomes difficult to distinguish sources with different temperatures. We assess the role of noise in recent observational results that indicate an inverse and continuously varying \(T –\beta\) relation. Though an inverse and continuous \(T –\beta\) correlation may be a physical property of dust in the interstellar medium, we find that the observed inverse correlation may be primarily due to noise.
Published Version: doi:10.1088/0004-637X/696/1/676
Other Sources: http://arxiv.org/abs/0902.0636v2
Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:4481286

Show full Dublin Core record

This item appears in the following Collection(s)

  • FAS Scholarly Articles [7501]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University
 
 

Search DASH


Advanced Search
 
 

Submitters