An Expanding H I Photodissociated Region Associated With the Compact H Ii Region G213.880–11.837 in the GGD 14 Complex

Gómez, Yolanda; Garay, Guido; Rodríguez-Rico, C. A.; Neria, Citlali; Rodrı́guez, Luis F.; Escalante, V.; Lizano, Susana; Lebrón, M.

doi:10.1088/0004-6256/140/4/913

Cited by 5 publications

(5 citation statements)

References 28 publications

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“…Using infrared integral field spectroscopy, Maaskant et al (2011) studied the stellar content of the cluster, identifying two very young and massive B stars, as well as several PMS stars of spectral types G and K. As a signpost of high-mass star formation, this region also hosts a bright cometary H II region that is powered by an early B star (Kurtz et al 1994;Gómez et al 1998). This region was subsequently shown to be associated with an expanding H I region (Gómez et al 2010).…”

Section: Our Target Ggd 12-15mentioning

confidence: 99%

YSOVAR: MID-INFRARED VARIABILITY AMONG YSOs IN THE STAR FORMATION REGION GGD12-15

Wolk¹,

Günther²,

Poppenhaeger³

et al. 2015

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We present an IR-monitoring survey with the Spitzer Space Telescope of the star-forming region GGD 12-15. More than 1000 objects were monitored, including about 350 objects within the central 5′, which is found to be especially dense in cluster members. The monitoring took place over 38 days and is part of the Young Stellar Object VARiability project. The region was also the subject of a contemporaneous 67 ks Chandra observation. The field includes 119 previously identified pre-main sequence star candidates. X-rays are detected from 164 objects, 90 of which are identified with cluster members. Overall, we find that about half the objects in the central 5′ are young stellar objects (YSOs) based on a combination of their spectral energy distribution, IR variability, and X-ray emission. Most of the stars with IR excess relative to a photosphere show large amplitude (>0.1 mag) mid-infrared (mid-IR) variability. There are 39 periodic sources, and all but one is found to be a cluster member. Almost half of the periodic sources do not show IR excesses. Overall, more than 85% of the Class I, flat spectrum, and Class II sources are found to vary. The amplitude of the variability is larger in more embedded YSOs. Most of the Class I/ II objects exhibit redder colors in a fainter state, which is compatible with time-variable extinction. A few become bluer when fainter, which can be explained with significant changes in the structure of the inner disk. A search for changes in the IR due to X-ray events is carried out, but the low number of flares prevented an analysis of the direct impact of X-ray flares on the IR light curves. However, we find that X-ray detected Class II sources have longer timescales for change in the MIR than a similar set of non-X-ray detected Class IIs.

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Section: Our Target Ggd 12-15mentioning

confidence: 99%

YSOVAR: MID-INFRARED VARIABILITY AMONG YSOs IN THE STAR FORMATION REGION GGD12-15

Wolk¹,

Günther²,

Poppenhaeger³

et al. 2015

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“…Alternatively, as shown in Figure 4, the C2 region is partially blended with both the source E (to the south) and the HMC (to the east); the outflow could originate from either source. We note that the arc of H 2 O masers near the HMC (Fey et al 1994;Gómez et al 2000) shows a blueshifted northsouth velocity gradient that extends to ∼0 km s −1 . However, as shown by the VLBI observations of the H 2 O masers by Imai et al (2011; see their Figure 5), the water masers are distributed to the east of the cometary H II region, coincident with the HMC and not with C2.…”

Section: Origin Of the Oh Absorption: Association With Broadmentioning

confidence: 69%

“…The radio continuum of the G34.26 + 0.15 complex has been extensively studied in the literature (e.g., Reid & Ho 1985;Wood & Churchwell 1989;Fey et al 1994;Sewiło et al 2011). This site of high-mass star formation contains a compact H II region with a diameter of ∼1 5 (see continuum images from the VLA D-configuration observations shown in the center column of Figure 2), which is known as source D (e.g., Fey et al 1994;Gómez et al 2000;Campbell et al 2004). At the VLA D-configuration resolution, a bright (almost unresolved) continuum source is seen northwest of source D. Arcsecond-resolution observations of the bright continuum source reveals a cometary UCH II region with a diffuse tail propagating west (source C) and two HCH II regions (sources A and B) east of the UCH II region.…”

Section: Origin Of the Oh Absorption: Association With Broadmentioning

confidence: 99%

Excited Hydroxyl Outflow in the High-mass Star-forming Region G34.26 + 0.15

Tan,

Araya,

Rigg

et al. 2023

ApJ

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G34.26 + 0.15 is a region of high-mass star formation that contains a broad range of young stellar objects in different stages of evolution, including a hot molecular core, hypercompact H ii regions, and a prototypical cometary ultracompact H ii region. Previous high-sensitivity single-dish observations by our group resulted in the detection of broad 6035 MHz OH absorption in this region; the line showed a significant blueshifted asymmetry indicative of molecular gas expansion. We present high-sensitivity Karl G. Jansky Very Large Array (VLA) observations of the 6035 MHz OH line conducted to image the absorption and investigate its origin with respect to the different star formation sites in the region. In addition, we report detection of 6030 MHz OH absorption with the VLA and further observations of 4.7 GHz and 6.0 GHz OH lines obtained with the Arecibo Telescope. The 6030 MHz OH line shows a very similar absorption profile as the 6035 MHz OH line. We found that the 6035 MHz OH line absorption region is spatially unresolved at ∼2″ scales, and it is coincident with one of the bright ionized cores of the cometary H ii region that shows broad radio recombination line emission. We discuss a scenario where the OH absorption is tracing the remnants of a pole-on molecular outflow that is being ionized inside-out by the ultracompact H ii region.

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“…Using infrared integral field spectroscopy, Maaskant et al (2011) studied the stellar content of the cluster, identifying two very young and massive B stars as well as several pre-main sequence stars of spectral types G and K. As a signpost of high-mass star formation, this region also hosts a bright cometary H II region which is powered by an early B star (Kurtz et al 1994;Gómez et al 1998). This region was subsequently shown to be associated with an expanding H I region (Gómez et al 2010).…”

Section: Our Target Ggd 12-15mentioning

confidence: 99%

YSOVAR: Mid-infrared Variability Among YSOs in the Star Formation Region GGD 12-15

Wolk,

Günther,

Poppenhaeger

et al. 2015

Preprint

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We present an IR-monitoring survey with the Spitzer Space Telescope of the star forming region GGD 12-15. Over 1000 objects were monitored including about 350 objects within the central 5 which is found to be especially dense in cluster members. The monitoring took place over 38 days and is part of the Young Stellar Object VARiability (YSOVAR) project. The region was also the subject of a contemporaneous 67 ks Chandra observation. The field includes 119 previously identified pre-main sequence star candidates. X-rays are detected from 164 objects, 90 of which are identified with cluster members. Overall, we find that about half the objects in the central 5 are young stellar objects based on a combination of their spectral energy distribution, IR variability and X-ray emission. Most of the stars with IR excess relative to a photosphere show large amplitude (>0.1 mag) mid-IR variability. There are 39 periodic sources, all but one of these is found to be a cluster member. Almost half of the periodic sources do not show IR excesses. Overall, more than 85% of the Class I, flat spectrum, and Class II sources are found to vary. The amplitude of the variability is larger in more embedded young stellar objects. Most of the Class I/II objects exhibit redder colors in a fainter state, compatible with time-variable extinction. A few become bluer when fainter, which can be explained with significant changes in the structure of the inner disk. A search for changes in the IR due to X-ray events is carried out, but the low number of flares prevented an analysis of the direct impact of X-ray flares on the IR lightcurves. However, we find that X-ray detected Class II sources have longer timescales for change in the mid-IR than a similar set of non-X-ray detected Class IIs.

show abstract

An Expanding H I Photodissociated Region Associated With the Compact H Ii Region G213.880–11.837 in the GGD 14 Complex

Cited by 5 publications

References 28 publications

YSOVAR: MID-INFRARED VARIABILITY AMONG YSOs IN THE STAR FORMATION REGION GGD12-15

YSOVAR: MID-INFRARED VARIABILITY AMONG YSOs IN THE STAR FORMATION REGION GGD12-15

Excited Hydroxyl Outflow in the High-mass Star-forming Region G34.26 + 0.15

YSOVAR: Mid-infrared Variability Among YSOs in the Star Formation Region GGD 12-15

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