Unveiling the birth and evolution of the H ii region Sh2-173

Cichowolski, Silvina; Romero, Guillermo; Ortega, M. E.; Cappa, C. E.; Vasquez, J.

doi:10.1111/j.1365-2966.2008.14322.x

Cited by 25 publications

(24 citation statements)

References 67 publications

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“…Later on, Cichowolski et al (2009), using the CGPS database (Taylor et al 2003), reported that the H ii region Sh2-173 was born and is evolving onto the borders of a large elliptical feature (whose major and minor axis have angular diameter of 6.…”

Section: Previous H I Work Towards L ∼ 118mentioning

confidence: 99%

The H i supershell GS 118+01−44 and its role in the interstellar medium

Suad

Cichowolski

Noriega-Crespo

et al. 2016

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Aims. We carry out a multiwavelength study to characterize the H i supershell designated GS 118+01−44, and to analyse its possible origin. Methods.A multiwavelength study has been carried out to study the supershell and its environs. We performed an analysis of the H i, CO, radio continuum, and infrared emission distributions.Results. The Canadian Galactic Plane Survey (CGPS) H i data reveals that GS 118+01−44 is centred at (l, b) = (117.• 7, 1.• 4) with a systemic velocity of −44.3 km s −1 . According to Galactic rotation models this structure is located at 3.0 ± 0.6 kpc from the Sun.There are several H ii regions and three supernova remnants (SNRs) catalogued in the region. On the other hand, the analysis of the temperature spectral index distribution shows that in the region there is a predominance of non-thermal emission. Infrared emission shows that cool temperatures dominate the area of the supershell. Concerning the origin of the structure, we found that even though several OB stars belonging to Cas OB5 are located in the interior of GS 118+01−44, an analysis of the energy injected by these stars through their stellar winds indicates that they do not have sufficient energy to create GS 118+01−44. Therefore, an additional energy source is needed to explain the genesis of GS 118+01−44. On the other hand, the presence of several H ii regions and young stellar object candidates in the edges of GS 118+01−44 shows that the region is still active in forming new stars.

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Section: Previous H I Work Towards L ∼ 118mentioning

confidence: 99%

The H i supershell GS 118+01−44 and its role in the interstellar medium

Suad

Cichowolski

Noriega-Crespo

et al. 2016

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“…of the HII region, that we called G45L, is collecting the molecular gas, as is observed in other HII regions (e.g. Pomarès et al 2009;Cichowolski et al 2009;Deharveng et al 2008). Figure 4 shows the integrated velocity channel maps of the 13 CO J = 1−0 emission every ∼1.25 km s −1 .…”

Section: Fig 2 Two Color Imagesmentioning

confidence: 99%

The environs of the ultracompact HII region G45.45+0.06

Paron¹,

Cichowolski²,

Ortega³

2009

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Aims. G45.45+0.06 is an ultra-compact HII (UCHII) region that has been extensively studied. It is known that G45.45+0.06 is embedded in a complex of UCHII regions, but to date, the surrounding ISM on a larger spatial scale has not been analyzed. Methods. Using data from large-scale surveys, the Two Micron All Sky Survey, GLIMPSE, MIPSGAL, MAGPIS and GRS, we performed a multiwavelength study of a region of about 7 × 7 in the vicinity of G45.45+0.06. Results. We found that the UCHII complex lies on the border of a larger (diameter of ∼3 ) and fainter HII region, which is located at the same distance as G45.45+0.06, ∼8 kpc. In this work, this larger HII region is called G45L. A good morphological correlation is observed between the PDRs and the molecular gas mapped in the 13 CO J = 1−0 and CS J = 2−1 lines, suggesting that G45L may be collecting molecular material. From a near-and mid-IR photometric study, we found three sources, likely O-type stars, that are possibly responsible for the creation of G45L. Additionally, we found several YSO candidates lying preferentially in the molecular shell that surrounds G45L. Our results confirm that the region southeast of the UCHII complex where G45.45+0.06 is embedded and east of G45L is undergoing active star formation. We suggest that G45L has been expanding for about 2 × 10 6 yr and could have triggered the formation of the zero-age main sequence stars that ionize the UCHII region G45.45+0.06. However we cannot discard that both HII regions are coeval.

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“…An increasing body of observational evidence confirms the importance of this mechanism (e.g. Patel et al 1998;Oey et al 2005;Arnal & Corti 2007;Cichowolski et al 2009). Given the size of GSH 91.5+2−114, it seems reasonable to expect some signs of recent star-formation activity in or near the shell border.…”

Section: Triggered Star-formation?mentioning

confidence: 95%

GSH 91.5+2–114: A large H i shell in the outer part of the Galaxy

Cichowolski

Pineault

2010

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GSH 91.5 + 2 − 114 is a large H i shell located in the outer Galaxy at a kinematic distance of about 15 kpc. It was first identified in the Canadian Galactic Plane Survey (CGPS) by Pineault et al. (2002, ASP Conf. Ser., 276, 332) as being possibly associated with objects possessing infrared colors, which indicates strong stellar winds. The H i shell has no obvious continuum counterpart in the CGPS radio images at 408 and 1420 MHz or in the IRAS images. We found no evidence for early-type massive stars, most likely as a result of the large extinction that is expected for this large distance. An analysis of the energetics and of the main physical parameters of the H i shell shows that this shell is likely the result of the combined action of the stellar winds and supernova explosions of many stars. We investigate whether a number of slightly extended regions characterized by a thermal radio continuum and located near the periphery of the H i shell could be the result of star formation triggered by the expanding shell.

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Unveiling the birth and evolution of the H ii region Sh2-173

Cited by 25 publications

References 67 publications

The H i supershell GS 118+01−44 and its role in the interstellar medium

The H i supershell GS 118+01−44 and its role in the interstellar medium

The environs of the ultracompact HII region G45.45+0.06

GSH 91.5+2–114: A large H i shell in the outer part of the Galaxy

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