H I SHELLS AND SUPERSHELLS IN THE I-GALFA H I 21 cm LINE SURVEY. I. FAST-EXPANDING H I SHELLS ASSOCIATED WITH SUPERNOVA REMNANTS

被引：32

作者：

Park, G. ^{[1
]}

Koo, B. -C. ^{[1
]}

Gibson, S. J. ^{[2
]}

Kang, J. -H. ^{[3
,4
,5
]}

Lane, D. C. ^{[3
,6
]}

Douglas, K. A. ^{[3
,7
]}

Peek, J. E. G. ^{[8
]}

Korpela, E. J. ^{[9
]}

Heiles, C. ^{[10
]}

Newton, J. H. ^{[2
,11
]}

机构：

[1] Seoul Natl Univ, Dept Phys & Astron, Seoul 151742, South Korea

[2] Western Kentucky Univ, Dept Phys & Astron, Bowling Green, KY 42101 USA

[3] Natl Astron & Ionosphere Ctr, Arecibo Observ, Arecibo, PR 00612 USA

[4] Yonsei Univ, Yonsei Univ Observ, Seoul 120749, South Korea

[5] Korea Astron & Space Sci Inst, Taejon 305348, South Korea

[6] San Diego State Univ, Dept Elect & Comp Engn, San Diego, CA 92182 USA

[7] Univ Calgary, Domin Radio Astrophys Observ, Penticton, BC V2A 6J9, Canada

[8] Columbia Univ, Dept Astron, New York, NY 10027 USA

[9] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA

[10] Univ Calif Berkeley, Radio Astron Lab, Berkeley, CA 94720 USA

[11] McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada

来源：

ASTROPHYSICAL JOURNAL | 2013年 / 777卷 / 01期

关键词：

Galaxy: disk; ISM: supernova remnants; radio lines: ISM; GAMMA-RAY EMISSION; GALACTIC PLANE; MOLECULAR CLOUD; KINEMATIC DISTANCES; NEUTRAL HYDROGEN; PERSEUS ARM; CO SHELL; DISCOVERY; PULSAR; W44;

D O I：

10.1088/0004-637X/777/1/14

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We search for fast-expanding Hi shells associated with Galactic supernova remnants (SNRs) in the longitude range l approximate to 32 degrees to 77 degrees using 21 cm line data from the Inner-Galaxy Arecibo L-band Feed Array (I-GALFA) Hi survey. Among the 39 known Galactic SNRs in this region, we find such Hi shells in 4 SNRs: W44, G54.4-0.3, W51C, and CTB 80. All four were previously identified in low-resolution surveys, and three of those (excluding G54.4-0.3) were previously studied with the Arecibo telescope. A remarkable new result, however, is the detection of Hi emission at both very high positive and negative velocities in W44 from the receding and approaching parts of the Hi expanding shell, respectively. This is the first detection of both sides of an expanding shell associated with an SNR in H I 21 cm emission. The high-resolution I-GALFA survey data also reveal a prominent expanding Hi shell with high circular symmetry associated with G54.4-0.3. We explore the physical characteristics of four SNRs and discuss what differentiates them from other SNRs in the survey area. We conclude that these four SNRs are likely the remnants of core-collapse supernovae interacting with a relatively dense (greater than or similar to 1 cm(-3)) ambient medium, and we discuss the visibility of SNRs in the H I 21 cm line.

引用

页数：14

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