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

Abstract

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 neighbourhood. We present the VLT/KMOS integral field spectroscopy in the near-infrared of $\sim$120 candidate young stellar objects (YSOs) in the CMa-$\ell$224 star-forming region located at a Galactocentric distance of 9.1 kpc. We characterise the YSO accretion luminosities and accretion rates using the hydrogen Br$\gamma$ emission and find the median accretion luminosity of $\log (L_{\mathrm{acc}})=-0.82_{-0.82}^{+0.80}{L}_{\odot }$. Based on the measured accretion luminosities, we investigate the hypothesis of star formation history in the CMa-$\ell$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 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.

Accepted for publication in APJS, 51 pages, 37 figures, 6 tables

References in corpus (29)

• The NumPy array: a structure for efficient numerical computation
• An eclipsing binary distance to the Large Magellanic Cloud accurate to 2 per cent
• A Catalog of Extended Green Objects (EGOs) in the GLIMPSE Survey: A new sample of massive young stellar object outflow candidates
• X-Shooter spectroscopy of young stellar objects in Lupus: Accretion properties of class II and transitional objects
• The origin of hydrogen line emission for five Herbig Ae/Be stars spatially resolved by VLTI/AMBER spectro-interferometry
• The identification of filaments on far infrared and submillimiter images. Morphology, physical conditions and relation with star formation of filamentary structure
• Dust and Gas in the Magellanic Clouds from the HERITAGE Herschel Key Project. II. Gas-to-Dust Ratio Variations across ISM Phases
• A modular set of synthetic spectral energy distributions for young stellar objects
• Connection between jets, winds and accretion in T Tauri stars: the X-shooter view
• Outflows, infall and evolution of a sample of embedded low-mass protostars. The William Herschel Line Legacy (WILL) survey
• The protoplanetary disk population in the rho-Ophiuchi region L1688 and the time evolution of Class II YSOs
• [OI]63micron jets in class 0 sources detected by Herschel
• Interstellar filaments and star formation
• Chemical distribution of HII regions towards the Galactic anticentre
• KMOS study of the mass accretion rate from Class I to Class II in NGC 1333
• Chemical Cartography with LAMOST and Gaia Reveal Azimuthal and Spiral Structure in the Galactic Disk
• Origin of warm and hot gas emission from low-mass protostars: Herschel-HIFI observations of CO J=16-15. I. Line profiles, physical conditions, and H2O abundance
• Analysis of physical processes in eruptive YSOs with near infrared spectra and multi-wavelength light curves
• $K$-band integral field spectroscopy and optical spectroscopy of massive young stellar objects in the Small Magellanic Cloud
• The Forgotten Quadrant Survey. ${}^{12}$CO and ${}^{13}$CO (1-0) survey of the Galactic Plane in the range 220°$<l<$240° -2.5°$<b<$0°
• Photometric determination of the mass accretion rates of pre-main sequence stars. V. Recent star formation in the 30 Dor nebula
• Near-IR Spectroscopic Monitoring of Class I Protostars: Variability of Accretion and Wind Indicators
• Dissecting the different components of the modest accretion bursts of the very young protostar HOPS 373
• Photometric determination of the mass accretion rates of pre-main sequence stars. VI. The case of LH 95 in the Large Magellanic Cloud
• Herschel spectroscopy of Massive Young Stellar Objects in the Magellanic Clouds
• The relation between the Mass Accretion Rate and the Disk Mass in Class I Protostars
• Beyond the Solar Circle $-$ Trends in Massive Star Formation Between the Inner and Outer Galaxy
• The segregation of starless and protostellar clumps in the Hi-GAL l=224deg region
• Three isotopologues CO survey of Molecular Clouds in the CMa OB1 complex