The Ap 2-1 nebula and the surrounding molecular cloud G35.2 - 0.74: An active star-forming region
Using data from large-scale surveys, like 2MASS, GLIMPSE, MIPSGAL, VGPS, GRS and IPHAS, we performed a multiwavelength study of the interstellar medium in a region of about 20 × 20 arcmin2 towards the molecular cloud G35.2 - 0.74. Additionally, the Ap 2-1 nebula, which is seen in projection over the...
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2010
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v408_n4_p2487_Paron http://hdl.handle.net/20.500.12110/paper_00358711_v408_n4_p2487_Paron |
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| Sumario: | Using data from large-scale surveys, like 2MASS, GLIMPSE, MIPSGAL, VGPS, GRS and IPHAS, we performed a multiwavelength study of the interstellar medium in a region of about 20 × 20 arcmin2 towards the molecular cloud G35.2 - 0.74. Additionally, the Ap 2-1 nebula, which is seen in projection over the molecular cloud, was studied using optical data obtained with the 2.15-m telescope at CASLEO, Argentina. From the H i absorption study, we estimate a distance of ~2 kpc for Ap 2-1, confirming that the nebula is embedded in the south portion of the molecular cloud G35.2 - 0.74. Performing a photometric study and analysing the spectral energy distribution of the sources likely to be embedded in the cloud, we confirm that this region is very active in star formation, mainly towards the north, where we discover a cluster of young stellar objects. From the Hα and [N ii] lines, we obtain a radial velocity of vLSR~ 31 km s-1 for the Ap 2-1 nebula, in coincidence with the velocity of the molecular cloud. Finally, we conclude that Ap 2-1 is an H ii region probably excited by an early B-type star. © 2010 The Authors. Journal compilation © 2010 RAS. |
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