Deconvolution of images from blast 2005: Insight into the K3-50 and IC 5146 star-forming regions

Arabindo Roy, Peter A R Ade, James J. Bock, Christopher M. Brunt, Edward L. Chapin, Mark J. Devlin, Simon R. Dicker, Kevin France, Andrew G. Gibb, Matthew Griffin, Joshua O. Gundersen, Mark Halpern, Peter C. Hargrave, David H. Hughes, Jeff Klein, Gaelen Marsden, Peter G. Martin, Philip Mauskopf, Calvin B. Netterfield, Luca OlmiGuillaume Patanchon, Marie Rex, Douglas Scott, Christopher Semisch, Matthew D P Truch, Carole Tucker, Gregory S. Tucker, Marco P. Viero, Donald V. Wiebe

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We present an implementation of the iterative flux-conserving Lucy-Richardson (L-R) deconvolution method of image restoration for maps produced by the Balloon-borne Large Aperture Submillimeter Telescope (BLAST). Compared to the direct Fourier transform method of deconvolution, the L-R operation restores images with better-controlled background noise and increases source detectability. Intermediate iterated images are useful for studying extended diffuse structures, while the later iterations truly enhance point sources to near the designed diffraction limit of the telescope. The L-R method of deconvolution is efficient in resolving compact sources in crowded regions while simultaneously conserving their respective flux densities. We have analyzed its performance and convergence extensively through simulations and cross-correlations of the deconvolved images with available high-resolution maps. We present new science results from two BLAST surveys, in the Galactic regions K3-50 and IC 5146, further demonstrating the benefits of performing this deconvolution. We have resolved three clumps within a radius of 45 inside the star-forming molecular cloud containing K3-50. Combining the well-resolved dust emission map with available multi-wavelength data, we have constrained the spectral energy distributions (SEDs) of five clumps to obtain masses (M), bolometric luminosities (L), and dust temperatures (T). The L-M diagram has been used as a diagnostic tool to estimate the evolutionary stages of the clumps. There are close relationships between dust continuum emission and both 21 cm radio continuum and 12CO molecular line emission. The restored extended large-scale structures in the Northern Streamer of IC 5146 have a strong spatial correlation with both SCUBA and high-resolution extinction images. A dust temperature of 12 K has been obtained for the central filament. We report physical properties of ten compact sources, including six associated protostars, by fitting SEDs to multi-wavelength data. All of these compact sources are still quite cold (typical temperature below 16 K) and are above the critical Bonner-Ebert mass. They have associated low-power young stellar objects. Further evidence for starless clumps has also been found in the IC 5146 region.

Original languageEnglish (US)
Article number142
JournalAstrophysical Journal
Volume730
Issue number2
DOIs
StatePublished - Apr 1 2011
Externally publishedYes

Fingerprint

blasts
deconvolution
clumps
stars
dust
telescopes
spectral energy distribution
apertures
continuums
wavelength
protostars
temperature
high resolution
background noise
balloons
molecular clouds
wavelengths
restoration
cross correlation
diffraction

Keywords

  • stars: formation
  • submillimeter: general
  • techniques: image processing

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Roy, A., Ade, P. A. R., Bock, J. J., Brunt, C. M., Chapin, E. L., Devlin, M. J., ... Wiebe, D. V. (2011). Deconvolution of images from blast 2005: Insight into the K3-50 and IC 5146 star-forming regions. Astrophysical Journal, 730(2), [142]. https://doi.org/10.1088/0004-637X/730/2/142

Deconvolution of images from blast 2005 : Insight into the K3-50 and IC 5146 star-forming regions. / Roy, Arabindo; Ade, Peter A R; Bock, James J.; Brunt, Christopher M.; Chapin, Edward L.; Devlin, Mark J.; Dicker, Simon R.; France, Kevin; Gibb, Andrew G.; Griffin, Matthew; Gundersen, Joshua O.; Halpern, Mark; Hargrave, Peter C.; Hughes, David H.; Klein, Jeff; Marsden, Gaelen; Martin, Peter G.; Mauskopf, Philip; Netterfield, Calvin B.; Olmi, Luca; Patanchon, Guillaume; Rex, Marie; Scott, Douglas; Semisch, Christopher; Truch, Matthew D P; Tucker, Carole; Tucker, Gregory S.; Viero, Marco P.; Wiebe, Donald V.

In: Astrophysical Journal, Vol. 730, No. 2, 142, 01.04.2011.

Research output: Contribution to journalArticle

Roy, A, Ade, PAR, Bock, JJ, Brunt, CM, Chapin, EL, Devlin, MJ, Dicker, SR, France, K, Gibb, AG, Griffin, M, Gundersen, JO, Halpern, M, Hargrave, PC, Hughes, DH, Klein, J, Marsden, G, Martin, PG, Mauskopf, P, Netterfield, CB, Olmi, L, Patanchon, G, Rex, M, Scott, D, Semisch, C, Truch, MDP, Tucker, C, Tucker, GS, Viero, MP & Wiebe, DV 2011, 'Deconvolution of images from blast 2005: Insight into the K3-50 and IC 5146 star-forming regions', Astrophysical Journal, vol. 730, no. 2, 142. https://doi.org/10.1088/0004-637X/730/2/142
Roy, Arabindo ; Ade, Peter A R ; Bock, James J. ; Brunt, Christopher M. ; Chapin, Edward L. ; Devlin, Mark J. ; Dicker, Simon R. ; France, Kevin ; Gibb, Andrew G. ; Griffin, Matthew ; Gundersen, Joshua O. ; Halpern, Mark ; Hargrave, Peter C. ; Hughes, David H. ; Klein, Jeff ; Marsden, Gaelen ; Martin, Peter G. ; Mauskopf, Philip ; Netterfield, Calvin B. ; Olmi, Luca ; Patanchon, Guillaume ; Rex, Marie ; Scott, Douglas ; Semisch, Christopher ; Truch, Matthew D P ; Tucker, Carole ; Tucker, Gregory S. ; Viero, Marco P. ; Wiebe, Donald V. / Deconvolution of images from blast 2005 : Insight into the K3-50 and IC 5146 star-forming regions. In: Astrophysical Journal. 2011 ; Vol. 730, No. 2.
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AU - Roy, Arabindo

AU - Ade, Peter A R

AU - Bock, James J.

AU - Brunt, Christopher M.

AU - Chapin, Edward L.

AU - Devlin, Mark J.

AU - Dicker, Simon R.

AU - France, Kevin

AU - Gibb, Andrew G.

AU - Griffin, Matthew

AU - Gundersen, Joshua O.

AU - Halpern, Mark

AU - Hargrave, Peter C.

AU - Hughes, David H.

AU - Klein, Jeff

AU - Marsden, Gaelen

AU - Martin, Peter G.

AU - Mauskopf, Philip

AU - Netterfield, Calvin B.

AU - Olmi, Luca

AU - Patanchon, Guillaume

AU - Rex, Marie

AU - Scott, Douglas

AU - Semisch, Christopher

AU - Truch, Matthew D P

AU - Tucker, Carole

AU - Tucker, Gregory S.

AU - Viero, Marco P.

AU - Wiebe, Donald V.

PY - 2011/4/1

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N2 - We present an implementation of the iterative flux-conserving Lucy-Richardson (L-R) deconvolution method of image restoration for maps produced by the Balloon-borne Large Aperture Submillimeter Telescope (BLAST). Compared to the direct Fourier transform method of deconvolution, the L-R operation restores images with better-controlled background noise and increases source detectability. Intermediate iterated images are useful for studying extended diffuse structures, while the later iterations truly enhance point sources to near the designed diffraction limit of the telescope. The L-R method of deconvolution is efficient in resolving compact sources in crowded regions while simultaneously conserving their respective flux densities. We have analyzed its performance and convergence extensively through simulations and cross-correlations of the deconvolved images with available high-resolution maps. We present new science results from two BLAST surveys, in the Galactic regions K3-50 and IC 5146, further demonstrating the benefits of performing this deconvolution. We have resolved three clumps within a radius of 45 inside the star-forming molecular cloud containing K3-50. Combining the well-resolved dust emission map with available multi-wavelength data, we have constrained the spectral energy distributions (SEDs) of five clumps to obtain masses (M), bolometric luminosities (L), and dust temperatures (T). The L-M diagram has been used as a diagnostic tool to estimate the evolutionary stages of the clumps. There are close relationships between dust continuum emission and both 21 cm radio continuum and 12CO molecular line emission. The restored extended large-scale structures in the Northern Streamer of IC 5146 have a strong spatial correlation with both SCUBA and high-resolution extinction images. A dust temperature of 12 K has been obtained for the central filament. We report physical properties of ten compact sources, including six associated protostars, by fitting SEDs to multi-wavelength data. All of these compact sources are still quite cold (typical temperature below 16 K) and are above the critical Bonner-Ebert mass. They have associated low-power young stellar objects. Further evidence for starless clumps has also been found in the IC 5146 region.

AB - We present an implementation of the iterative flux-conserving Lucy-Richardson (L-R) deconvolution method of image restoration for maps produced by the Balloon-borne Large Aperture Submillimeter Telescope (BLAST). Compared to the direct Fourier transform method of deconvolution, the L-R operation restores images with better-controlled background noise and increases source detectability. Intermediate iterated images are useful for studying extended diffuse structures, while the later iterations truly enhance point sources to near the designed diffraction limit of the telescope. The L-R method of deconvolution is efficient in resolving compact sources in crowded regions while simultaneously conserving their respective flux densities. We have analyzed its performance and convergence extensively through simulations and cross-correlations of the deconvolved images with available high-resolution maps. We present new science results from two BLAST surveys, in the Galactic regions K3-50 and IC 5146, further demonstrating the benefits of performing this deconvolution. We have resolved three clumps within a radius of 45 inside the star-forming molecular cloud containing K3-50. Combining the well-resolved dust emission map with available multi-wavelength data, we have constrained the spectral energy distributions (SEDs) of five clumps to obtain masses (M), bolometric luminosities (L), and dust temperatures (T). The L-M diagram has been used as a diagnostic tool to estimate the evolutionary stages of the clumps. There are close relationships between dust continuum emission and both 21 cm radio continuum and 12CO molecular line emission. The restored extended large-scale structures in the Northern Streamer of IC 5146 have a strong spatial correlation with both SCUBA and high-resolution extinction images. A dust temperature of 12 K has been obtained for the central filament. We report physical properties of ten compact sources, including six associated protostars, by fitting SEDs to multi-wavelength data. All of these compact sources are still quite cold (typical temperature below 16 K) and are above the critical Bonner-Ebert mass. They have associated low-power young stellar objects. Further evidence for starless clumps has also been found in the IC 5146 region.

KW - stars: formation

KW - submillimeter: general

KW - techniques: image processing

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