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 Dishoeck; Zahed Wahhaj; Kaisa E. Young

doi:10.1086/510422

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

Astronomy and Planetary Sciences

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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 A_V > 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 language	English (US)
Pages (from-to)	493-504
Number of pages	12
Journal	Astrophysical Journal
Volume	656
Issue number	1 I
DOIs	https://doi.org/10.1086/510422
State	Published - Feb 10 2007

Keywords

Stars: formation
Stars: low-mass, brown dwarfs

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/510422

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Porras, A., Joørgensen, J. K., Allen, L. E., Evans, N. J., Bourke, T. L., Alcalá, J. M., Dunham, M. M., Blake, G. A., Chapman, N., Cieza, L., Harvey, P. M., Huard, T. L., Koerner, D. W., Mundy, L. G., Myers, P. C., Padgett, D. L., Sargent, A. I., Stapelfeldt, K. R., Teuben, P., ... 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

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

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

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.",

keywords = "Stars: formation, Stars: low-mass, brown dwarfs",

author = "Alicia Porras and Jo{\o}rgensen, {Jes K.} and Allen, {Lori E.} and Evans, {Neal J.} and Bourke, {Tyler L.} and Alcal{\'a}, {Juan M.} and Dunham, {Michael M.} and Blake, {Geoffrey A.} and Nicholas Chapman and Lucas Cieza and Harvey, {Paul M.} and Huard, {Tracy L.} and Koerner, {David W.} and Mundy, {Lee G.} and Myers, {Philip C.} and Padgett, {Deborah L.} and Sargent, {Anneila I.} and Stapelfeldt, {Karl R.} and Peter Teuben and {Van Dishoeck}, {Ewine F.} and Zahed Wahhaj and Young, {Kaisa E.}",

year = "2007",

month = feb,

day = "10",

doi = "10.1086/510422",

language = "English (US)",

volume = "656",

pages = "493--504",

journal = "Astrophysical Journal",

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TY - JOUR

T1 - The Spitzer c2d survey of large, nearby, interstellar clouds. V. Chamaeleon II observed with Irac

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

Y1 - 2007/2/10

N2 - 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.

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.

KW - Stars: formation

KW - Stars: low-mass, brown dwarfs

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U2 - 10.1086/510422

DO - 10.1086/510422

M3 - Article

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SN - 0004-637X

VL - 656

SP - 493

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JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 I

ER -

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

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