J 2016

Colliding interstellar bubbles in the direction of l=54 degrees

ZYCHOVÁ, Lenka and Soňa EHLEROVÁ

Basic information

Original name

Colliding interstellar bubbles in the direction of l=54 degrees

Authors

ZYCHOVÁ, Lenka (203 Czech Republic, belonging to the institution) and Soňa EHLEROVÁ (203 Czech Republic)

Edition

ASTRONOMY & ASTROPHYSICS, LES ULIS CEDEX A, EDP SCIENCES S A, 2016, 1432-0746

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10308 Astronomy

Country of publisher

France

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

Impact factor

Impact factor: 5.014

RIV identification code

RIV/00216224:14310/16:00094217

Organization unit

Faculty of Science

DOI

UT WoS

000388573500017

Keywords in English

ISM: bubbles; ISM: clouds; HII regions; ISM: supernova remnants

Tags

Tags

International impact, Reviewed
Změněno: 11/5/2017 19:01, Ing. Andrea Mikešková

Abstract

V originále

Context. Interstellar bubbles are structures in the interstellar medium with diameters of a few to tens of parsecs. Their progenitors are stellar winds, intense radiation of massive stars, or supernova explosions. Star formation and young stellar objects are commonly associated with these structures. Aims. We compare infrared observations of bubbles N115, N116 and N117 with atomic, molecular and ionized gas in this region. While determining the dynamical properties of the bubbles, we also look into their ambient environment to understand their formation in a wider context. Methods. To find bubbles in HI (Very Large Array Galactic Plane Survey) and CO data (Galactic Ring Survey), we used the images from the Galactic Legacy Infrared Mid-Plane Survey. We manually constructed masks based on the appearance of the bubbles in the IR images and applied them to the HI and CO data. We determined kinematic distance, size, expansion velocity, mass, original density of the maternal cloud, age, and energy input of the bubbles. Results. We identified two systems of bubbles: the first, the background system, is formed by large structures G053.9 + 0.2 and SNR G054.4-0.3 and the infrared bubble N116 + 117. The second, the foreground system, includes the infrared bubble N115 and two large HI bubbles, which we discovered in the HI data. Both systems are independent, lying at different distances, but look similar. They are both formed by two large colliding bubbles with radii around 20-30 pc and ages of a few million years. A younger and smaller (similar to 4 pc, less than a million years) infrared bubble lies at the position of the collision. Conclusions. We found that both infrared bubbles N115 and N116 + 117 are associated with the collisions of larger and older bubbles. We propose that such collisions increase the probability of further star formation, probably by squeezing the interstellar material, suggesting that they are an important mechanism for star formation.