The Spitzer c2d survey of large, nearby, interstellar clouds. V. Chamaeleon II observed with Irac

Alicia Porras, Jes K. Joørgensen, Lori E. Allen, Neal J. Evans, Tyler L. Bourke, Juan M. Alcalá, Michael M. Dunham, Geoffrey A. Blake, Nicholas Chapman, Lucas Cieza, Paul M. Harvey, Tracy L. Huard, David W Koerner, Lee G. Mundy, Philip C. Myers, Deborah L. Padgett, Anneila I. Sargent, Karl R. Stapelfeldt, Peter Teuben, Ewine F. Van DishoeckZahed Wahhaj, Kaisa E. Young

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

We present IRAC (3.6, 4.5, 5.8, and 8.0 μm) observations of the Chamaeleon Il molecular cloud. The observed area covers about 1 deg2 defined by AV > 2. Analysis of the data in the 2005 c2d catalogs reveals a small number of sources (40) with properties similar to those of young stellar or substellar objects (YSOs). The surface density of these YSO candidates is low, and contamination by background galaxies appears to be substantial, especially for sources classified as Class I or flat spectral energy distribution (SED). We discuss this problem in some detail and conclude that very few of the candidate YSOs in early evolutionary stages are actually in the Cha II cloud. Using a refined set of criteria, we define a smaller, but more reliable, set of 24 YSO candidates.

Original languageEnglish (US)
Pages (from-to)493-504
Number of pages12
JournalAstrophysical Journal
Volume656
Issue number1 I
DOIs
StatePublished - Feb 10 2007

Fingerprint

spectral energy distribution
molecular clouds
catalogs
contamination
galaxies
young
energy
distribution
analysis

Keywords

  • Stars: formation
  • Stars: low-mass, brown dwarfs

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Porras, A., Joørgensen, J. K., Allen, L. E., Evans, N. J., Bourke, T. L., Alcalá, J. M., ... Young, K. E. (2007). The Spitzer c2d survey of large, nearby, interstellar clouds. V. Chamaeleon II observed with Irac. Astrophysical Journal, 656(1 I), 493-504. https://doi.org/10.1086/510422

The Spitzer c2d survey of large, nearby, interstellar clouds. V. Chamaeleon II observed with Irac. / Porras, Alicia; Joørgensen, Jes K.; Allen, Lori E.; Evans, Neal J.; Bourke, Tyler L.; Alcalá, Juan M.; Dunham, Michael M.; Blake, Geoffrey A.; Chapman, Nicholas; Cieza, Lucas; Harvey, Paul M.; Huard, Tracy L.; Koerner, David W; Mundy, Lee G.; Myers, Philip C.; Padgett, Deborah L.; Sargent, Anneila I.; Stapelfeldt, Karl R.; Teuben, Peter; Van Dishoeck, Ewine F.; Wahhaj, Zahed; Young, Kaisa E.

In: Astrophysical Journal, Vol. 656, No. 1 I, 10.02.2007, p. 493-504.

Research output: Contribution to journalArticle

Porras, A, Joørgensen, JK, Allen, LE, Evans, NJ, Bourke, TL, Alcalá, JM, Dunham, MM, Blake, GA, Chapman, N, Cieza, L, Harvey, PM, Huard, TL, Koerner, DW, Mundy, LG, Myers, PC, Padgett, DL, Sargent, AI, Stapelfeldt, KR, Teuben, P, Van Dishoeck, EF, Wahhaj, Z & Young, KE 2007, 'The Spitzer c2d survey of large, nearby, interstellar clouds. V. Chamaeleon II observed with Irac', Astrophysical Journal, vol. 656, no. 1 I, pp. 493-504. https://doi.org/10.1086/510422
Porras A, Joørgensen JK, Allen LE, Evans NJ, Bourke TL, Alcalá JM et al. The Spitzer c2d survey of large, nearby, interstellar clouds. V. Chamaeleon II observed with Irac. Astrophysical Journal. 2007 Feb 10;656(1 I):493-504. https://doi.org/10.1086/510422
Porras, Alicia ; Joørgensen, Jes K. ; Allen, Lori E. ; Evans, Neal J. ; Bourke, Tyler L. ; Alcalá, Juan M. ; Dunham, Michael M. ; Blake, Geoffrey A. ; Chapman, Nicholas ; Cieza, Lucas ; Harvey, Paul M. ; Huard, Tracy L. ; Koerner, David W ; Mundy, Lee G. ; Myers, Philip C. ; Padgett, Deborah L. ; Sargent, Anneila I. ; Stapelfeldt, Karl R. ; Teuben, Peter ; Van Dishoeck, Ewine F. ; Wahhaj, Zahed ; Young, Kaisa E. / The Spitzer c2d survey of large, nearby, interstellar clouds. V. Chamaeleon II observed with Irac. In: Astrophysical Journal. 2007 ; Vol. 656, No. 1 I. pp. 493-504.
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AU - Porras, Alicia

AU - Joørgensen, Jes K.

AU - Allen, Lori E.

AU - Evans, Neal J.

AU - Bourke, Tyler L.

AU - Alcalá, Juan M.

AU - Dunham, Michael M.

AU - Blake, Geoffrey A.

AU - Chapman, Nicholas

AU - Cieza, Lucas

AU - Harvey, Paul M.

AU - Huard, Tracy L.

AU - Koerner, David W

AU - Mundy, Lee G.

AU - Myers, Philip C.

AU - Padgett, Deborah L.

AU - Sargent, Anneila I.

AU - Stapelfeldt, Karl R.

AU - Teuben, Peter

AU - Van Dishoeck, Ewine F.

AU - Wahhaj, Zahed

AU - Young, Kaisa E.

PY - 2007/2/10

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AB - We present IRAC (3.6, 4.5, 5.8, and 8.0 μm) observations of the Chamaeleon Il molecular cloud. The observed area covers about 1 deg2 defined by AV > 2. Analysis of the data in the 2005 c2d catalogs reveals a small number of sources (40) with properties similar to those of young stellar or substellar objects (YSOs). The surface density of these YSO candidates is low, and contamination by background galaxies appears to be substantial, especially for sources classified as Class I or flat spectral energy distribution (SED). We discuss this problem in some detail and conclude that very few of the candidate YSOs in early evolutionary stages are actually in the Cha II cloud. Using a refined set of criteria, we define a smaller, but more reliable, set of 24 YSO candidates.

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