A pan-carina young stellar object catalog: Intermediate-mass young stellar objects in the Carina Nebula identified via mid-infrared excess emission

Matthew S. Povich, Nathan Smith, Steven R. Majewski, Konstantin V. Getman, Leisa K. Townsley, Brian L. Babler, Patrick Sean Broos, Rémy Indebetouw, Marilyn R. Meade, Thomas P. Robitaille, Keivan G. Stassun, Barbara A. Whitney, Yoshinori Yonekura, Yasuo Fukui

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Abstract

We present a catalog of 1439 young stellar objects (YSOs) spanning the 1.42deg2 field surveyed by the Chandra Carina Complex Project (CCCP), which includes the major ionizing clusters and the most active sites of ongoing star formation within the Great Nebula in Carina. Candidate YSOs were identified via infrared (IR) excess emission from dusty circumstellar disks and envelopes, using data from the Spitzer Space Telescope (the Vela-Carina survey) and the Two-Micron All Sky Survey. We model the 1-24 μm IR spectral energy distributions of the YSOs to constrain physical properties. Our Pan-Carina YSO Catalog (PCYC) is dominated by intermediate-mass (2 M Ȯ < m ≲ 10 M Ȯ) objects with disks, including Herbig Ae/Be stars and their less evolved progenitors. The PCYC provides a valuable complementary data set to the CCCP X-ray source catalogs, identifying 1029 YSOs in Carina with no X-ray detection. We also catalog 410 YSOs with X-ray counterparts, including 62 candidate protostars. Candidate protostars with X-ray detections tend to be more evolved than those without. In most cases, X-ray emission apparently originating from intermediate-mass, disk-dominated YSOs is consistent with the presence of low-mass companions, but we also find that X-ray emission correlates with cooler stellar photospheres and higher disk masses. We suggest that intermediate-mass YSOs produce X-rays during their early pre-main-sequence evolution, perhaps driven by magnetic dynamo activity during the convective atmosphere phase, but this emission dies off as the stars approach the main sequence. Extrapolating over the stellar initial mass function scaled to the PCYC population, we predict a total population of >2 × 104 YSOs and a present-day star formation rate (SFR) of >0.008 M Ȯyr-1. The global SFR in the Carina Nebula, averaged over the past 5Myr, has been approximately constant.

Original languageEnglish (US)
Article number14
JournalAstrophysical Journal, Supplement Series
Volume194
Issue number1
DOIs
StatePublished - May 1 2011

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star formation rate
nebulae
catalogs
Space Infrared Telescope Facility
spectral energy distribution
star formation
envelopes
physical properties
physical property
young
energy
rate

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Povich, Matthew S. ; Smith, Nathan ; Majewski, Steven R. ; Getman, Konstantin V. ; Townsley, Leisa K. ; Babler, Brian L. ; Broos, Patrick Sean ; Indebetouw, Rémy ; Meade, Marilyn R. ; Robitaille, Thomas P. ; Stassun, Keivan G. ; Whitney, Barbara A. ; Yonekura, Yoshinori ; Fukui, Yasuo. / A pan-carina young stellar object catalog : Intermediate-mass young stellar objects in the Carina Nebula identified via mid-infrared excess emission. In: Astrophysical Journal, Supplement Series. 2011 ; Vol. 194, No. 1.
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A pan-carina young stellar object catalog : Intermediate-mass young stellar objects in the Carina Nebula identified via mid-infrared excess emission. / Povich, Matthew S.; Smith, Nathan; Majewski, Steven R.; Getman, Konstantin V.; Townsley, Leisa K.; Babler, Brian L.; Broos, Patrick Sean; Indebetouw, Rémy; Meade, Marilyn R.; Robitaille, Thomas P.; Stassun, Keivan G.; Whitney, Barbara A.; Yonekura, Yoshinori; Fukui, Yasuo.

In: Astrophysical Journal, Supplement Series, Vol. 194, No. 1, 14, 01.05.2011.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A pan-carina young stellar object catalog

T2 - Intermediate-mass young stellar objects in the Carina Nebula identified via mid-infrared excess emission

AU - Povich, Matthew S.

AU - Smith, Nathan

AU - Majewski, Steven R.

AU - Getman, Konstantin V.

AU - Townsley, Leisa K.

AU - Babler, Brian L.

AU - Broos, Patrick Sean

AU - Indebetouw, Rémy

AU - Meade, Marilyn R.

AU - Robitaille, Thomas P.

AU - Stassun, Keivan G.

AU - Whitney, Barbara A.

AU - Yonekura, Yoshinori

AU - Fukui, Yasuo

PY - 2011/5/1

Y1 - 2011/5/1

N2 - We present a catalog of 1439 young stellar objects (YSOs) spanning the 1.42deg2 field surveyed by the Chandra Carina Complex Project (CCCP), which includes the major ionizing clusters and the most active sites of ongoing star formation within the Great Nebula in Carina. Candidate YSOs were identified via infrared (IR) excess emission from dusty circumstellar disks and envelopes, using data from the Spitzer Space Telescope (the Vela-Carina survey) and the Two-Micron All Sky Survey. We model the 1-24 μm IR spectral energy distributions of the YSOs to constrain physical properties. Our Pan-Carina YSO Catalog (PCYC) is dominated by intermediate-mass (2 M Ȯ < m ≲ 10 M Ȯ) objects with disks, including Herbig Ae/Be stars and their less evolved progenitors. The PCYC provides a valuable complementary data set to the CCCP X-ray source catalogs, identifying 1029 YSOs in Carina with no X-ray detection. We also catalog 410 YSOs with X-ray counterparts, including 62 candidate protostars. Candidate protostars with X-ray detections tend to be more evolved than those without. In most cases, X-ray emission apparently originating from intermediate-mass, disk-dominated YSOs is consistent with the presence of low-mass companions, but we also find that X-ray emission correlates with cooler stellar photospheres and higher disk masses. We suggest that intermediate-mass YSOs produce X-rays during their early pre-main-sequence evolution, perhaps driven by magnetic dynamo activity during the convective atmosphere phase, but this emission dies off as the stars approach the main sequence. Extrapolating over the stellar initial mass function scaled to the PCYC population, we predict a total population of >2 × 104 YSOs and a present-day star formation rate (SFR) of >0.008 M Ȯyr-1. The global SFR in the Carina Nebula, averaged over the past 5Myr, has been approximately constant.

AB - We present a catalog of 1439 young stellar objects (YSOs) spanning the 1.42deg2 field surveyed by the Chandra Carina Complex Project (CCCP), which includes the major ionizing clusters and the most active sites of ongoing star formation within the Great Nebula in Carina. Candidate YSOs were identified via infrared (IR) excess emission from dusty circumstellar disks and envelopes, using data from the Spitzer Space Telescope (the Vela-Carina survey) and the Two-Micron All Sky Survey. We model the 1-24 μm IR spectral energy distributions of the YSOs to constrain physical properties. Our Pan-Carina YSO Catalog (PCYC) is dominated by intermediate-mass (2 M Ȯ < m ≲ 10 M Ȯ) objects with disks, including Herbig Ae/Be stars and their less evolved progenitors. The PCYC provides a valuable complementary data set to the CCCP X-ray source catalogs, identifying 1029 YSOs in Carina with no X-ray detection. We also catalog 410 YSOs with X-ray counterparts, including 62 candidate protostars. Candidate protostars with X-ray detections tend to be more evolved than those without. In most cases, X-ray emission apparently originating from intermediate-mass, disk-dominated YSOs is consistent with the presence of low-mass companions, but we also find that X-ray emission correlates with cooler stellar photospheres and higher disk masses. We suggest that intermediate-mass YSOs produce X-rays during their early pre-main-sequence evolution, perhaps driven by magnetic dynamo activity during the convective atmosphere phase, but this emission dies off as the stars approach the main sequence. Extrapolating over the stellar initial mass function scaled to the PCYC population, we predict a total population of >2 × 104 YSOs and a present-day star formation rate (SFR) of >0.008 M Ȯyr-1. The global SFR in the Carina Nebula, averaged over the past 5Myr, has been approximately constant.

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