A NIKA view of two star-forming infrared dark clouds: Dust emissivity variations and mass concentration

A. J. Rigby; N. Peretto; R. Adam; P. Ade; P. André; H. Aussel; A. Beelen; A. Benoît; A. Bracco; A. Bideaud; O. Bourrion; M. Calvo; A. Catalano; C. J.R. Clark; B. Comis; M. De Petris; F. X. Désert; S. Doyle; E. F.C. Driessen; J. Goupy; C. Kramer; G. Lagache; S. Leclercq; J. F. Lestrade; J. F. Macías-Pérez; Philip Mauskopf; F. Mayet; A. Monfardini; E. Pascale; L. Perotto; G. Pisano; N. Ponthieu; V. Revéret; A. Ritacco; C. Romero; H. Roussel; F. Ruppin; K. Schuster; A. Sievers; S. Triqueneaux; C. Tucker; R. Zylka

doi:10.1051/0004-6361/201732258

A NIKA view of two star-forming infrared dark clouds: Dust emissivity variations and mass concentration

A. J. Rigby, N. Peretto, R. Adam, P. Ade, P. André, H. Aussel, A. Beelen, A. Benoît, A. Bracco, A. Bideaud, O. Bourrion, M. Calvo, A. Catalano, C. J.R. Clark, B. Comis, M. De Petris, F. X. Désert, S. Doyle, E. F.C. Driessen, J. GoupyC. Kramer, G. Lagache, S. Leclercq, J. F. Lestrade, J. F. Macías-Pérez, Philip Mauskopf, F. Mayet, A. Monfardini, E. Pascale, L. Perotto, G. Pisano, N. Ponthieu, V. Revéret, A. Ritacco, C. Romero, H. Roussel, F. Ruppin, K. Schuster, A. Sievers, S. Triqueneaux, C. Tucker, R. Zylka

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

Context. The thermal emission of dust grains is a powerful tool for probing cold, dense regions of molecular gas in the interstellar medium, and so constraining dust properties is key to obtaining accurate measurements of dust mass and temperature. Aims. By placing constraints on the dust emissivity spectral index, β, towards two star-forming infrared dark clouds - SDC18.888-0.476 and SDC24.489-0.689 - we aim to evaluate the role of mass concentration in the associated star-formation activity. Methods. We exploited the simultaneous 1.2 and 2.0 mm imaging capability of the NIKA camera on the IRAM 30 m telescope to construct maps of β for both clouds, and by incorporating Herschel observations, we created H₂ column density maps with 13″ angular resolution. Results. While we find no significant systematic radial variations around the most massive clumps in either cloud on ≳ 0.1 pc scales, their mean β values are significantly different, with β = 2.07 ± 0.09 (random) ± 0.25 (systematic) for SDC18.888-0.476 and β = 1.71 ± 0.09 (random) ± 0.25 (systematic) for SDC24.489-0.689. These differences could be a consequence of the very different environments in which both clouds lie, and we suggest that the proximity of SDC18.888-0.476 to the W39 H II region may raise β on scales of ∼1 pc. We also find that the mass in SDC24.489-0.689 is more centrally concentrated and circularly symmetric than in SDC18.888-0.476, and is consistent with a scenario in which spherical globally-collapsing clouds concentrate a higher fraction of their mass into a single core than elongated clouds that will more easily fragment, distributing their mass into many cores. Conclusions. We demonstrate that β variations towards interstellar clouds can be robustly constrained with high signal-to-noise ratio (S/N) NIKA observations, providing more accurate estimates of their masses. The methods presented here will be applied to the Galactic Star Formation with NIKA2 (GASTON) guaranteed time large programme, extending our analysis to a statistically significant sample of star-forming clouds.

Original language	English (US)
Article number	A18
Journal	Astronomy and Astrophysics
Volume	615
DOIs	https://doi.org/10.1051/0004-6361/201732258
State	Published - Jul 1 2018

Keywords

Dust extinction
ISM: clouds
ISM: structure
Stars: formation
Submillimeter: ISM

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.1051/0004-6361/201732258

Cite this

Rigby, A. J., Peretto, N., Adam, R., Ade, P., André, P., Aussel, H., Beelen, A., Benoît, A., Bracco, A., Bideaud, A., Bourrion, O., Calvo, M., Catalano, A., Clark, C. J. R., Comis, B., De Petris, M., Désert, F. X., Doyle, S., Driessen, E. F. C., ... Zylka, R. (2018). A NIKA view of two star-forming infrared dark clouds: Dust emissivity variations and mass concentration. Astronomy and Astrophysics, 615, Article A18. https://doi.org/10.1051/0004-6361/201732258

Rigby, AJ, Peretto, N, Adam, R, Ade, P, André, P, Aussel, H, Beelen, A, Benoît, A, Bracco, A, Bideaud, A, Bourrion, O, Calvo, M, Catalano, A, Clark, CJR, Comis, B, De Petris, M, Désert, FX, Doyle, S, Driessen, EFC, Goupy, J, Kramer, C, Lagache, G, Leclercq, S, Lestrade, JF, Macías-Pérez, JF, Mauskopf, P, Mayet, F, Monfardini, A, Pascale, E, Perotto, L, Pisano, G, Ponthieu, N, Revéret, V, Ritacco, A, Romero, C, Roussel, H, Ruppin, F, Schuster, K, Sievers, A, Triqueneaux, S, Tucker, C & Zylka, R 2018, 'A NIKA view of two star-forming infrared dark clouds: Dust emissivity variations and mass concentration', Astronomy and Astrophysics, vol. 615, A18. https://doi.org/10.1051/0004-6361/201732258

@article{c343d0d2ee08486fb1f596820a505989,

title = "A NIKA view of two star-forming infrared dark clouds: Dust emissivity variations and mass concentration",

abstract = "Context. The thermal emission of dust grains is a powerful tool for probing cold, dense regions of molecular gas in the interstellar medium, and so constraining dust properties is key to obtaining accurate measurements of dust mass and temperature. Aims. By placing constraints on the dust emissivity spectral index, β, towards two star-forming infrared dark clouds - SDC18.888-0.476 and SDC24.489-0.689 - we aim to evaluate the role of mass concentration in the associated star-formation activity. Methods. We exploited the simultaneous 1.2 and 2.0 mm imaging capability of the NIKA camera on the IRAM 30 m telescope to construct maps of β for both clouds, and by incorporating Herschel observations, we created H2 column density maps with 13″ angular resolution. Results. While we find no significant systematic radial variations around the most massive clumps in either cloud on ≳ 0.1 pc scales, their mean β values are significantly different, with β = 2.07 ± 0.09 (random) ± 0.25 (systematic) for SDC18.888-0.476 and β = 1.71 ± 0.09 (random) ± 0.25 (systematic) for SDC24.489-0.689. These differences could be a consequence of the very different environments in which both clouds lie, and we suggest that the proximity of SDC18.888-0.476 to the W39 H II region may raise β on scales of ∼1 pc. We also find that the mass in SDC24.489-0.689 is more centrally concentrated and circularly symmetric than in SDC18.888-0.476, and is consistent with a scenario in which spherical globally-collapsing clouds concentrate a higher fraction of their mass into a single core than elongated clouds that will more easily fragment, distributing their mass into many cores. Conclusions. We demonstrate that β variations towards interstellar clouds can be robustly constrained with high signal-to-noise ratio (S/N) NIKA observations, providing more accurate estimates of their masses. The methods presented here will be applied to the Galactic Star Formation with NIKA2 (GASTON) guaranteed time large programme, extending our analysis to a statistically significant sample of star-forming clouds.",

keywords = "Dust extinction, ISM: clouds, ISM: structure, Stars: formation, Submillimeter: ISM",

author = "Rigby, {A. J.} and N. Peretto and R. Adam and P. Ade and P. Andr{\'e} and H. Aussel and A. Beelen and A. Beno{\^i}t and A. Bracco and A. Bideaud and O. Bourrion and M. Calvo and A. Catalano and Clark, {C. J.R.} and B. Comis and {De Petris}, M. and D{\'e}sert, {F. X.} and S. Doyle and Driessen, {E. F.C.} and J. Goupy and C. Kramer and G. Lagache and S. Leclercq and Lestrade, {J. F.} and Mac{\'i}as-P{\'e}rez, {J. F.} and Philip Mauskopf and F. Mayet and A. Monfardini and E. Pascale and L. Perotto and G. Pisano and N. Ponthieu and V. Rev{\'e}ret and A. Ritacco and C. Romero and H. Roussel and F. Ruppin and K. Schuster and A. Sievers and S. Triqueneaux and C. Tucker and R. Zylka",

note = "Publisher Copyright: {\textcopyright} 2018 ESO.",

year = "2018",

month = jul,

day = "1",

doi = "10.1051/0004-6361/201732258",

language = "English (US)",

volume = "615",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

TY - JOUR

T1 - A NIKA view of two star-forming infrared dark clouds

T2 - Dust emissivity variations and mass concentration

AU - Rigby, A. J.

AU - Peretto, N.

AU - Adam, R.

AU - Ade, P.

AU - André, P.

AU - Aussel, H.

AU - Beelen, A.

AU - Benoît, A.

AU - Bracco, A.

AU - Bideaud, A.

AU - Bourrion, O.

AU - Calvo, M.

AU - Catalano, A.

AU - Clark, C. J.R.

AU - Comis, B.

AU - De Petris, M.

AU - Désert, F. X.

AU - Doyle, S.

AU - Driessen, E. F.C.

AU - Goupy, J.

AU - Kramer, C.

AU - Lagache, G.

AU - Leclercq, S.

AU - Lestrade, J. F.

AU - Macías-Pérez, J. F.

AU - Mauskopf, Philip

AU - Mayet, F.

AU - Monfardini, A.

AU - Pascale, E.

AU - Perotto, L.

AU - Pisano, G.

AU - Ponthieu, N.

AU - Revéret, V.

AU - Ritacco, A.

AU - Romero, C.

AU - Roussel, H.

AU - Ruppin, F.

AU - Schuster, K.

AU - Sievers, A.

AU - Triqueneaux, S.

AU - Tucker, C.

AU - Zylka, R.

PY - 2018/7/1

Y1 - 2018/7/1

N2 - Context. The thermal emission of dust grains is a powerful tool for probing cold, dense regions of molecular gas in the interstellar medium, and so constraining dust properties is key to obtaining accurate measurements of dust mass and temperature. Aims. By placing constraints on the dust emissivity spectral index, β, towards two star-forming infrared dark clouds - SDC18.888-0.476 and SDC24.489-0.689 - we aim to evaluate the role of mass concentration in the associated star-formation activity. Methods. We exploited the simultaneous 1.2 and 2.0 mm imaging capability of the NIKA camera on the IRAM 30 m telescope to construct maps of β for both clouds, and by incorporating Herschel observations, we created H2 column density maps with 13″ angular resolution. Results. While we find no significant systematic radial variations around the most massive clumps in either cloud on ≳ 0.1 pc scales, their mean β values are significantly different, with β = 2.07 ± 0.09 (random) ± 0.25 (systematic) for SDC18.888-0.476 and β = 1.71 ± 0.09 (random) ± 0.25 (systematic) for SDC24.489-0.689. These differences could be a consequence of the very different environments in which both clouds lie, and we suggest that the proximity of SDC18.888-0.476 to the W39 H II region may raise β on scales of ∼1 pc. We also find that the mass in SDC24.489-0.689 is more centrally concentrated and circularly symmetric than in SDC18.888-0.476, and is consistent with a scenario in which spherical globally-collapsing clouds concentrate a higher fraction of their mass into a single core than elongated clouds that will more easily fragment, distributing their mass into many cores. Conclusions. We demonstrate that β variations towards interstellar clouds can be robustly constrained with high signal-to-noise ratio (S/N) NIKA observations, providing more accurate estimates of their masses. The methods presented here will be applied to the Galactic Star Formation with NIKA2 (GASTON) guaranteed time large programme, extending our analysis to a statistically significant sample of star-forming clouds.

AB - Context. The thermal emission of dust grains is a powerful tool for probing cold, dense regions of molecular gas in the interstellar medium, and so constraining dust properties is key to obtaining accurate measurements of dust mass and temperature. Aims. By placing constraints on the dust emissivity spectral index, β, towards two star-forming infrared dark clouds - SDC18.888-0.476 and SDC24.489-0.689 - we aim to evaluate the role of mass concentration in the associated star-formation activity. Methods. We exploited the simultaneous 1.2 and 2.0 mm imaging capability of the NIKA camera on the IRAM 30 m telescope to construct maps of β for both clouds, and by incorporating Herschel observations, we created H2 column density maps with 13″ angular resolution. Results. While we find no significant systematic radial variations around the most massive clumps in either cloud on ≳ 0.1 pc scales, their mean β values are significantly different, with β = 2.07 ± 0.09 (random) ± 0.25 (systematic) for SDC18.888-0.476 and β = 1.71 ± 0.09 (random) ± 0.25 (systematic) for SDC24.489-0.689. These differences could be a consequence of the very different environments in which both clouds lie, and we suggest that the proximity of SDC18.888-0.476 to the W39 H II region may raise β on scales of ∼1 pc. We also find that the mass in SDC24.489-0.689 is more centrally concentrated and circularly symmetric than in SDC18.888-0.476, and is consistent with a scenario in which spherical globally-collapsing clouds concentrate a higher fraction of their mass into a single core than elongated clouds that will more easily fragment, distributing their mass into many cores. Conclusions. We demonstrate that β variations towards interstellar clouds can be robustly constrained with high signal-to-noise ratio (S/N) NIKA observations, providing more accurate estimates of their masses. The methods presented here will be applied to the Galactic Star Formation with NIKA2 (GASTON) guaranteed time large programme, extending our analysis to a statistically significant sample of star-forming clouds.

KW - Dust extinction

KW - ISM: clouds

KW - ISM: structure

KW - Stars: formation

KW - Submillimeter: ISM

UR - http://www.scopus.com/inward/record.url?scp=85050259010&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85050259010&partnerID=8YFLogxK

U2 - 10.1051/0004-6361/201732258

DO - 10.1051/0004-6361/201732258

M3 - Article

AN - SCOPUS:85050259010

SN - 0004-6361

VL - 615

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A18

ER -

A NIKA view of two star-forming infrared dark clouds: Dust emissivity variations and mass concentration

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

NIKA view of two star-forming IRDCs

Cite this

A NIKA view of two star-forming infrared dark clouds: Dust emissivity variations and mass concentration

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Datasets

NIKA view of two star-forming IRDCs

Cite this