The Spitzer c2d survey of large, nearby, insterstellar clouds. II. Serpens observed with IRAC
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The Spitzer c2d survey of large, nearby, insterstellar clouds. II. Serpens observed with IRAC. / Harvey, Paul M.; Chapman, Nicholas; Lai, Shih Ping; Evans, Neal J.; Allen, Lori E.; Jørgensen, Jes K.; Mundy, Lee G.; Huard, Tracy L.; Porras, Alicia; Cieza, Lucas; Myers, Philip C.; Merín, Bruno; Van Dishoeck, Ewine F.; Young, Kaisa E.; Spiesman, William; Blake, Geoffrey A.; Koerner, David W.; Padgett, Deborah L.; Sargent, Anneila I.; Stapelfeldt, Karl R.
I: Astrophysical Journal, Bind 644, Nr. 1, 10.06.2006, s. 307-325.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - The Spitzer c2d survey of large, nearby, insterstellar clouds. II. Serpens observed with IRAC
AU - Harvey, Paul M.
AU - Chapman, Nicholas
AU - Lai, Shih Ping
AU - Evans, Neal J.
AU - Allen, Lori E.
AU - Jørgensen, Jes K.
AU - Mundy, Lee G.
AU - Huard, Tracy L.
AU - Porras, Alicia
AU - Cieza, Lucas
AU - Myers, Philip C.
AU - Merín, Bruno
AU - Van Dishoeck, Ewine F.
AU - Young, Kaisa E.
AU - Spiesman, William
AU - Blake, Geoffrey A.
AU - Koerner, David W.
AU - Padgett, Deborah L.
AU - Sargent, Anneila I.
AU - Stapelfeldt, Karl R.
PY - 2006/6/10
Y1 - 2006/6/10
N2 - We present maps of 0.89 deg2 of the Serpens dark cloud at 3.6, 4.5, 5.8, and 8.0 μm observed with the Spitzer Space Telescope Infrared Array Camera (IRAC). We discuss in detail the data processing carried out by the c2d team on IRAC data. More than 100,000 compact sources have been extracted, but we confine most of our discussion to the most reliable subset of these sources. This includes those that are detected above 7 σ in all four IRAC bands or those detected in the two shorter IRAC bands together with 2MASS. We estimate completeness limits for our survey from Monte Carlo tests with artificial sources inserted into the Spitzer maps. We compare source counts, colors, and magnitudes in the Serpens cloud to two reference data sets, a 0.10 deg2 set of low-extinction regions near the dark cloud and a 1 deg2 subset of the SWIRE Elais N1 data that was processed through our pipeline. We find that it is possible to identify more than 200 young stellar object (YSO) candidates from color-magnitude and color-color diagrams, most of which were previously unknown. In addition to the dense area of new star formation known before in the "core" region (cluster A), we also find a moderately rich area to the south (cluster B). Our mapped area also includes the Herbig Ae star VV Ser, whose Spitzer images have been carefully modeled in a separate study. The extreme sensitivity of Spitzer IRAC allows us to search to very low luminosity limits for young substellar objects. The comparison of the Serpens region with the reference areas suggests that a population of infrared excess sources exists in Serpens at least down to luminosities of L ∼ 10-3 L⊙ and possibly lower.
AB - We present maps of 0.89 deg2 of the Serpens dark cloud at 3.6, 4.5, 5.8, and 8.0 μm observed with the Spitzer Space Telescope Infrared Array Camera (IRAC). We discuss in detail the data processing carried out by the c2d team on IRAC data. More than 100,000 compact sources have been extracted, but we confine most of our discussion to the most reliable subset of these sources. This includes those that are detected above 7 σ in all four IRAC bands or those detected in the two shorter IRAC bands together with 2MASS. We estimate completeness limits for our survey from Monte Carlo tests with artificial sources inserted into the Spitzer maps. We compare source counts, colors, and magnitudes in the Serpens cloud to two reference data sets, a 0.10 deg2 set of low-extinction regions near the dark cloud and a 1 deg2 subset of the SWIRE Elais N1 data that was processed through our pipeline. We find that it is possible to identify more than 200 young stellar object (YSO) candidates from color-magnitude and color-color diagrams, most of which were previously unknown. In addition to the dense area of new star formation known before in the "core" region (cluster A), we also find a moderately rich area to the south (cluster B). Our mapped area also includes the Herbig Ae star VV Ser, whose Spitzer images have been carefully modeled in a separate study. The extreme sensitivity of Spitzer IRAC allows us to search to very low luminosity limits for young substellar objects. The comparison of the Serpens region with the reference areas suggests that a population of infrared excess sources exists in Serpens at least down to luminosities of L ∼ 10-3 L⊙ and possibly lower.
KW - Infrared: ISM
KW - ISM: clouds
UR - http://www.scopus.com/inward/record.url?scp=33747033110&partnerID=8YFLogxK
U2 - 10.1086/503520
DO - 10.1086/503520
M3 - Journal article
AN - SCOPUS:33747033110
VL - 644
SP - 307
EP - 325
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 1
ER -
ID: 234019355