Star formation in a diffuse high-altitude cloud?

被引：4

作者：

Kerp, J. ^{[1
]}

Lenz, D. ^{[1
]}

Roehser, T. ^{[1
]}

机构：

[1] Argelander Inst Astron, Hugel 71, D-53121 Bonn, Germany

来源：

ASTRONOMY & ASTROPHYSICS | 2016年 / 589卷

关键词：

Galaxy: halo; ISM: clouds; ISM: individual objects: HRK81.4-77.8; stars: formation; HIGH GALACTIC LATITUDES; X-RAY SHADOWS; MOLECULAR CLOUD; MILKY-WAY; DRACO NEBULA; H-I; GAS; DISTANCE; MAPS; HALO;

D O I：

10.1051/0004-6361/201526984

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. A recent discovery of two stellar clusters associated with the diffuse high-latitude cloud HRK 81.4-77.8 has important implications for star formation in the Galactic halo. Aims. We derive a plausible distance estimate to HRK 81.4-77.8 primarily from its gaseous properties. Methods. We spatially correlate state-of-the-art HI, far-infrared and soft X-ray data to analyze the diffuse gas in the cloud. The absorption of the soft X-ray emission from the Galactic halo by HRK 81.4-77.8 is used to constrain the distance to the cloud. Results. HRK 81.4-77.8 is most likely located at an altitude of about 400 pc within the disk-halo interface of the Milky Way Galaxy. The HI data discloses a disbalance in density and pressure between the warm and cold gaseous phases. Apparently, the cold gas is compressed by the warm medium. This disbalance might trigger the formation of molecular gas high above the Galactic plane on pc to sub-pc scales.

引用

页数：5

共 50 条

[1] Star formation in a diffuse high-altitude cloud?
[J]. 1600, EDP Sciences (589):
[2] UTILIZATION OF HIGH-ALTITUDE CLOUD PHOTOGRAPHY
HUBERT, LF
[J]. JOURNAL OF GEOPHYSICAL RESEARCH, 1960, 65 (08): : 2498 - 2498
[3] High-altitude water ice cloud formation on Mars controlled by interplanetary dust particles
V. L Hartwick
O. B. Toon
N. G. Heavens
[J]. Nature Geoscience, 2019, 12 : 516 - 521
[4] High-altitude water ice cloud formation on Mars controlled by interplanetary dust particles
Hartwick, V. L.
Toon, O. B.
Heavens, N. G.
[J]. NATURE GEOSCIENCE, 2019, 12 (07) : 516 - +
[5] OXYGEN AND AVIAN EGGSHELL FORMATION AT HIGH-ALTITUDE
HEMPLEMAN, SC
ADAMSON, TP
BEBOUT, DE
[J]. RESPIRATION PHYSIOLOGY, 1993, 92 (01): : 1 - 12
[6] Gravity waves and high-altitude CO2 ice cloud formation in the Martian atmosphere
Yigit, Erdal
Medvedev, Alexander S.
Hartogh, Paul
[J]. GEOPHYSICAL RESEARCH LETTERS, 2015, 42 (11) : 4294 - 4300
[7] Birds of a high-altitude cloud forest in Alta Verapaz, Guatemala
Eisermann, K
Schulz, U
[J]. REVISTA DE BIOLOGIA TROPICAL, 2005, 53 (3-4) : 577 - 594
[8] On the formation of the high-altitude stagnant cusp: Cluster observations
Bogdanova, YV
Marchaudon, A
Owen, CJ
Dunlop, MW
Frey, HU
Wild, JA
Fazakerley, AN
Klecker, B
Davies, JA
Milan, SE
[J]. GEOPHYSICAL RESEARCH LETTERS, 2005, 32 (12) : 1 - 5
[9] HCN ice in Titan's high-altitude southern polar cloud
de Kok, Remco J.
Teanby, Nicholas A.
Maltagliati, Luca
Irwin, Patrick G. J.
Vinatier, Sandrine
[J]. NATURE, 2014, 514 (7520) : 65 - +
[10] High-Altitude Headache
Michael J. Marmura
Pablo Bandres Hernandez
[J]. Current Pain and Headache Reports, 2015, 19

← 1 2 3 4 5 →