MOLECULAR GAS HEATING MECHANISMS, AND STAR FORMATION FEEDBACK IN MERGER/STARBURSTS: NGC 6240 AND Arp 193 AS CASE STUDIES
文献类型：期刊论文
| 作者 | Papadopoulos, Padelis P.1; Zhang, Zhi-Yu2; Xilouris, E. M.3; Weiss, Axel4; van der Werf, Paul5; Israel, F. P.5; Greve, T. R.6; Isaak, Kate G.7; Gao, Y.8
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2014-06-20 |
| 卷号 | 788期号:2页码:0 |
| ISSN号 | 0004-637X |
| 关键词 | galaxies: active galaxies: ISM galaxies: starburst ISM: abundances ISM: kinematics and dynamics ISM: molecules techniques: spectroscopic |
| 英文摘要 | We used the SPIRE/FTS instrument aboard the Herschel Space Observatory to obtain the Spectral Line Energy Distributions (SLEDs) of CO from J= 4-3 to J= 13-12 of Arp 193 and NGC 6240, two classical merger/starbursts selected from our molecular line survey of local Luminous Infrared Galaxies (L-IR >= 10(11) L-circle dot). The high-J CO SLEDs are then combined with ground-based low-J CO, (CO)-C-13, HCN, HCO+, CS line data and used to probe the thermal and dynamical states of their large molecular gas reservoirs. We find the two CO SLEDs strongly diverging from J = 4-3 onward, with NGC 6240 having a much higher CO line excitation than Arp 193, despite their similar low-J CO SLEDs and LFIR/LCO, 1-0, LHCN/LCO (J = 1-0) ratios ( proxies of star formation efficiency and dense gas mass fraction). In Arp 193, one of the three most extreme starbursts in the local universe, the molecular SLEDs indicate a small amount (similar to 5%-15%) of dense gas (n >= 10(4) cm(-3)) unlike NGC 6240 where most of the molecular gas (similar to 60%-70%) is dense (n similar to (10(4)-10(5)) cm(-3)). Strong star-formation feedback can drive this disparity in their dense gas mass fractions, and also induce extreme thermal and dynamical states for the molecular gas. In NGC 6240, and to a lesser degree in Arp 193, we find large molecular gas masses whose thermal states cannot be maintained by FUV photons from Photon-Dominated Regions. We argue that this may happen often in metal-rich merger/starbursts, strongly altering the initial conditions of star formation. ALMA can now directly probe these conditions across cosmic epoch, and even probe their deeply dust-enshrouded outcome, the stellar initial mass function averaged over galactic evolution. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | ULTRALUMINOUS INFRARED GALAXIES ; HERSCHEL-SPIRE SPECTROSCOPY ; RAY DOMINATED REGIONS ; INITIAL MASS FUNCTION ; INTERSTELLAR-MEDIUM ; PHOTODISSOCIATION REGIONS ; GALACTIC-CENTER ; PHYSICAL CONDITIONS ; LUMINOUS GALAXIES ; HIGH-REDSHIFT |
| 收录类别 | SCI |
| 原文出处 | 10.1088/0004-637X/788/2/153 |
| 语种 | 英语 |
| WOS记录号 | WOS:000337466200056 |
| 公开日期 | 2014-11-21 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/10692]  |
| 专题 | 紫金山天文台_星系中的恒星形成研究团组 |
| 作者单位 | 1.Cardiff Univ, Sch Phys & Astron, Cardiff CF24 3AA, S Glam, Wales 2.Purple Mt Observatory, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China 3.Inst Astron Astrophys Space Applicat & Remote Sen, GR-15236 Athens, Greece 4.Max Planck Inst Radioastron, D-53121 Bonn, Germany 5.Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands 6.UCL, Dept Phys & Astron, London WC1E 6BT, England 7.European Space Agcy, Res & Sci Support Dept, NL-2200 AG Noordwijk, Netherlands 8.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China |
| 推荐引用方式 GB/T 7714 | Papadopoulos, Padelis P.,Zhang, Zhi-Yu,Xilouris, E. M.,et al. MOLECULAR GAS HEATING MECHANISMS, AND STAR FORMATION FEEDBACK IN MERGER/STARBURSTS: NGC 6240 AND Arp 193 AS CASE STUDIES[J]. ASTROPHYSICAL JOURNAL,2014,788(2):0. |
| APA | Papadopoulos, Padelis P..,Zhang, Zhi-Yu.,Xilouris, E. M..,Weiss, Axel.,van der Werf, Paul.,...&Gao, Y..(2014).MOLECULAR GAS HEATING MECHANISMS, AND STAR FORMATION FEEDBACK IN MERGER/STARBURSTS: NGC 6240 AND Arp 193 AS CASE STUDIES.ASTROPHYSICAL JOURNAL,788(2),0. |
| MLA | Papadopoulos, Padelis P.,et al."MOLECULAR GAS HEATING MECHANISMS, AND STAR FORMATION FEEDBACK IN MERGER/STARBURSTS: NGC 6240 AND Arp 193 AS CASE STUDIES".ASTROPHYSICAL JOURNAL 788.2(2014):0. |
入库方式： OAI收割
来源：紫金山天文台
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