2009ApJ...696..676S

Query : 2009ApJ...696..676S

2009ApJ...696..676S - Astrophys. J., 696, 676-680 (2009/May-1)

The effect of noise on the dust temperature-spectral index correlation.

SHETTY R., KAUFFMANN J., SCHNEE S. and GOODMAN A.A.

Abstract (from CDS):

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 β. Fitting SEDs to noisy fluxes solely in the Rayleigh-Jeans regime produces unreliable T and β estimates. Thus, for long wavelength observations (λ ≳ 200 µm), or for warm sources (T ≳ 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-β relation. Though an inverse and continuous T-β 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.

Abstract Copyright: ∼

Journal keyword(s): dust, extinction - infrared: ISM - methods: miscellaneous

Simbad objects: 1

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Number of rows : 1

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	NGC 6618	OpC	18 20 47	-16 10.3						~	1700	0

Query : 2009ApJ...696..676S

Basic data :

NGC 6618 -- Open Cluster
Other object types:	`Rad (CTB,GRS,...)`, `Cl* (2013A&A,C,...)`, `OpC (2014A&A,OCISM,...)`, `* (BD,GCRV,...)`, `As* (2019AJ,[KC2019])`, `Cl? (2013A&A)`, `HII (LBN)`, `X (1E)`
ICRS coord. (ep=J2000) :	`18 20 47.0 -16 10 18 (Optical) [ ] E 2009MNRAS.399.2146W`
FK4 coord. (ep=B1950 eq=1950) :	`18 17 53.9 -16 11 42 [ ]`
Gal coord. (ep=J2000) :	`015.0953 -00.7454 [ ]`
Proper motions mas/yr :	`1.510 -1.740 [0.060 0.080 90] D` `2017AstBu..72..257L`
Radial velocity / Redshift / cz :	`V(km/s) -44.577 [0.682] / z(~) -0.000149 [0.000002] / cz -44.57 [0.68] (Opt) C 2014A&A...562A..54C`
Parallaxes (mas):	`0.60 [0.04] C` `2019ApJ...870...32K`
Angular size (arcmin):	`1.63 1.63 90 (~) D` `2013A&A...560A..76M`

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`M 17`	`LBN 60`	`NAME Swan Nebula`	`W 38`
`BD-16 4820`	`LBN 015.28-00.67`	`NGC 6618`	`[BDB2003] G015.05-00.69`
`C 1817-162`	`LMH 21`	`NRL 4`	`[KC2019] Theia 846`
`CTB 52`	`MM 20`	`OCISM 9`	`[KPR2004b] 444`
`1E 1818.0-1610`	`NAME NGC 6618 Horseshoe`	`OCl 44`	`[KPS2012] MWSC 2896`
`GCRV 10811`	`NAME Checkmark Nebula`	`OCl 44.0`	`[PT56] 41`
`GRS G015.00 -00.70`	`NAME Lobster Nebula`	`Villafranca O-009`
`HD 168520`	`NAME omega Nebula`	`WEB 15351`

References (1700 between 1850 and 2026) (Total 1700)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : NGC 6618

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BD-16 4820 HD 168520 NGC 6618

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