EMERGE Early ALMA Survey
In the EMERGE Early ALMA Survey we investigated 7 star-forming regions in Orion (OMC-1/2/3/4 South, LDN 1641N, NGC 2023, and Flame Nebula) homogeneously surveyed in both molecular lines (N2H+ J=1-0, HNC J=1-0, plus HC3N J=10-9) and 3mm-continuum using a combination of interferometric ALMA mosaics and IRAM-30m single-dish (SD) maps together with a series of Herschel, Spitzer, and WISE archival data.
OMC-3 region observed as part of the EMERGE Early ALMA Survey
Paper I: Early ALMA Survey: observations and massive data reduction
In Hacar et al 2024 (Paper I), and in addition to the data processing, we investigated the global properties the 7 star-forming regions explored as part of the EMERGE Early ALMA Survey. We obtained independent continuum maps and spectral cubes for all our targets and molecular lines at different (SD and interferometric) resolutions and exploring multiple data combination techniques. Based on our low-resolution (SD) observations (30′′ or ∼ 12 000 au), we describe the global properties of our sample covering a wide range of physical conditions including low- (OMC-4 South, NGC 2023), intermediate (OMC-2, OMC-3, LDN 1641N), and high-mass (OMC-1, Flame Nebula) star-forming regions in different evolutionary stages. The comparison between our SD maps and ancillary YSO catalogs denotes N2H+ (1-0) as the best proxy for the dense, star-forming gas in our targets showing a constant star formation efficiency and a fast time evolution of ≲< 1 Myr. While apparently clumpy and filamentary in our SD data, all targets show a much more complex fibrous sub-structure at the enhanced resolution of our combined ALMA+IRAM-30m maps (4.5 or - 2 000 au). A large number of filamentary features at sub-parsec scales are clearly recognized in the high-density gas (> 105 cm−3) traced by N2H+ (1-0) directly connected to the formation of individual protostars. Surprisingly, this complex gas organization appears to extend further into the more diffuse gas (~103 - 104 cm−3) traced by HNC (1-0).
Coming soon!
Papers II (Bonanomi et al, submitted) and III (Socci et al, submitted) are around the corner. Please stay tuned!
Data Products
- Access to DR1 in Dataverse (link)