Investigating the Impact of Metallicity on Star Formation in the Outer Galaxy. I. VLT/KMOS Survey of Young Stellar Objects in Canis Major

Dominika Itrich; Agata Karska; Marta Sewiło; Lars E. Kristensen; Gregory J. Herczeg; Suzanne Ramsay; William J. Fischer; Benoît Tabone; Will R. M. Rocha; Maciej Koprowski; Ngân Lê; Beata Deka-Szymankiewicz

doi:10.3847/1538-4365/acdd55

The Astrophysical Journal Supplement Series (Jan 2023)

Investigating the Impact of Metallicity on Star Formation in the Outer Galaxy. I. VLT/KMOS Survey of Young Stellar Objects in Canis Major

Dominika Itrich,
Agata Karska,
Marta Sewiło,
Lars E. Kristensen,
Gregory J. Herczeg,
Suzanne Ramsay,
William J. Fischer,
Benoît Tabone,
Will R. M. Rocha,
Maciej Koprowski,
Ngân Lê,
Beata Deka-Szymankiewicz

Affiliations

Dominika Itrich: ORCiD; Institute of Astronomy, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University , Grudziądzka 5, 87-100 Toruń, Poland ; [email protected]; European Southern Observatory , Karl-Schwarzschild-Str. 2, D-85748 Garching bei München, Germany; Universitäts-Sternwarte , Ludwig-Maximilians-Universität, Scheinerstrasse 1, D-81679 München, Germany
Agata Karska: ORCiD; Institute of Astronomy, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University , Grudziądzka 5, 87-100 Toruń, Poland ; [email protected]; Max-Planck-Institut für Radioastronomie , Auf dem Hügel 69, D-53121, Bonn, Germany
Marta Sewiło: ORCiD; Exoplanets and Stellar Astrophysics Laboratory , NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA; Center for Research and Exploration in Space Science and Technology , NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA; Department of Astronomy, University of Maryland , College Park, MD 20742, USA
Lars E. Kristensen: ORCiD; Niels Bohr Institute, Centre for Star and Planet Formation, University of Copenhagen , Øster Voldgade 5-7, DK-1350 Copenhagen K, Denmark
Gregory J. Herczeg: ORCiD; Kavli Institute for Astronomy and Astrophysics, Peking University , Yiheyuan 5, Haidian Qu, 100871 Beijing, People's Republic of China; Department of Astronomy, Peking University , Yiheyuan 5, Haidian Qu, 100871 Beijing, People's Republic of China
Suzanne Ramsay: European Southern Observatory , Karl-Schwarzschild-Str. 2, D-85748 Garching bei München, Germany
William J. Fischer: ORCiD; Space Telescope Science Institute , 3700 San Martin Dr., Baltimore, MD 21218, USA
Benoît Tabone: ORCiD; Leiden Observatory, Leiden University , PO Box 9513, 2300 RA Leiden, The Netherlands; Institut d’Astrophysique Spatiale, Université Paris-Saclay , CNRS, Bâtiment 121, F-91405 Orsay Cedex, France
Will R. M. Rocha: ORCiD; Laboratory for Astrophysics, Leiden Observatory, Leiden University , PO Box 9513, 2300 RA Leiden, The Netherlands
Maciej Koprowski: ORCiD; Institute of Astronomy, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University , Grudziądzka 5, 87-100 Toruń, Poland ; [email protected]
Ngân Lê: ORCiD; Institute of Astronomy, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University , Grudziądzka 5, 87-100 Toruń, Poland ; [email protected]
Beata Deka-Szymankiewicz: Institute of Astronomy, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University , Grudziądzka 5, 87-100 Toruń, Poland ; [email protected]

DOI: https://doi.org/10.3847/1538-4365/acdd55
Journal volume & issue: Vol. 267, no. 2
p. 46

Abstract

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The effects of metallicity on the evolution of protoplanetary disks may be studied in the outer Galaxy where the metallicity is lower than in the solar neighborhood. We present the VLT/KMOS integral field spectroscopy in the near-infrared of ∼120 candidate young stellar objects (YSOs) in the CMa- ℓ 224 star-forming region located at a Galactocentric distance of 9.1 kpc. We characterize the YSO accretion luminosities and accretion rates using the hydrogen Br γ emission and find a median accretion luminosity of $\mathrm{log}({L}_{\mathrm{acc}})=-{0.82}_{-0.82}^{+0.80}{L}_{\odot }$ . Based on the measured accretion luminosities, we investigate the hypothesis of star formation history in the CMa- ℓ 224. Their median values suggest that Cluster C, where most of YSO candidates have been identified, might be the most evolved part of the region. The accretion luminosities are similar to those observed toward low-mass YSOs in the Perseus and Orion molecular clouds, and they do not reveal the impact of lower metallicity. Similar studies in other outer Galaxy clouds covering a wide range of metallicities are critical to gain a complete picture of star formation in the Galaxy.

Star-forming regions

Published in The Astrophysical Journal Supplement Series

ISSN: 0067-0049 (Print); 1538-4365 (Online)
Publisher: IOP Publishing
Country of publisher: United Kingdom
LCC subjects: Science: Astronomy: Astrophysics
Website: https://iopscience.iop.org/journal/0067-0049

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