COS Legacy档案光谱调查（经典）国库Atlas

论文标题

COS Legacy档案光谱调查（经典）国库Atlas

The COS Legacy Archive Spectroscopy SurveY (CLASSY) Treasury Atlas

论文作者

Berg, Danielle A., James, Bethan L., King, Teagan, Mcdonald, Meaghan, Chen, Zuyi, Chisholm, John, Heckman, Timothy, Martin, Crystal L., Stark, Dan P., Team, The Classy, :, Aloisi, Alessandra, AmorÍn, Ricardo O., Arellano-CÓrdova, Karla Z., Bayliss, Matthew, Bordoloi, Rongmon, Brinchmann, Jarle, Charlot, StÉphane, Chevallard, Jacopo, Clark, Ilyse, Erb, Dawn K., Feltre, Anna, Hayes, Matthew, Henry, Alaina, Hernandez, Svea, Jaskot, Anne, Jones, Tucker, Kewley, Lisa J., Kumari, Nimisha, Leitherer, Claus, Llerena, Mario, Maseda, Michael, Mingozzi, Matilde, Nanayakkara, Themiya, Ouchi, Masami, Plat, Adele, Pogge, Richard W., Ravindranath, Swara, Rigby, Jane R., Sanders, Ryan, Scarlata, Claudia, Senchyna, Peter, Skillman, Evan D., Steidel, Charles C., Strom, Allison L., Sugahara, Yuma, Wilkins, Stephen M., Wofford, Aida, Xu, Xinfeng

论文摘要

Far-Ultraviolet（FUV；〜1200-2000埃）光谱是我们对星形星系的理解至关重要的，为大量恒星种群，化学演化，反馈过程和电源提供了独特的窗口。 JWST的推出将很快引入一个新时代，将紫外线光谱界的边界推向更高的红移，但是它的成功取决于对观察到的紫外线光谱特征的巨大恒星种群和气体条件的全面理解。这需要一定程度的细节，只有结合了丰富的波长覆盖范围，信噪比，光谱分辨率和样品多样性，而这些FUV光谱数据库尚未实现。我们介绍了COS Legacy Spectroscopic调查（经典）财政部及其首个高级科学产品The Classy Atlas。优雅建立在HST档案基础上，以构建第一个高质量（S/N_1500> 〜5/resel），高分辨率（R〜15,000）FUV光谱数据库附近的45个（0.002 <z <z <0.182）星形星系。优雅地图集可通过优雅的网站向公众使用，是从312个HST观测值中最佳提取和共配170档案+新光谱的结果。优雅的样本涵盖了包括恒星质量（6.2 <logm_star（m_sol）<10.1），星形形成率（-2.0 <log sfr（m_sol/yr）<+1.6），直接气体相金属性（7.0 <12 +log log log log（O/h），iOnization（0.5 <o__38）， E（B-V <0.67）和肾小管密度（10 <n_e（cm^-3）<1120）偏向于紫外线形成星系，导致样本与z〜0质量 - 金属关系一致在宇宙时间内为星形星系制造星系的基准测试培训。

Far-ultraviolet (FUV; ~1200-2000 angstroms) spectra are fundamental to our understanding of star-forming galaxies, providing a unique window on massive stellar populations, chemical evolution, feedback processes, and reionization. The launch of JWST will soon usher in a new era, pushing the UV spectroscopic frontier to higher redshifts than ever before, however, its success hinges on a comprehensive understanding of the massive star populations and gas conditions that power the observed UV spectral features. This requires a level of detail that is only possible with a combination of ample wavelength coverage, signal-to-noise, spectral-resolution, and sample diversity that has not yet been achieved by any FUV spectral database. We present the COS Legacy Spectroscopic SurveY (CLASSY) treasury and its first high level science product, the CLASSY atlas. CLASSY builds on the HST archive to construct the first high-quality (S/N_1500 >~ 5/resel), high-resolution (R~15,000) FUV spectral database of 45 nearby (0.002 < z < 0.182) star-forming galaxies. The CLASSY atlas, available to the public via the CLASSY website, is the result of optimally extracting and coadding 170 archival+new spectra from 312 orbits of HST observations. The CLASSY sample covers a broad range of properties including stellar mass (6.2 < logM_star(M_sol) < 10.1), star formation rate (-2.0 < log SFR (M_sol/yr) < +1.6), direct gas-phase metallicity (7.0 < 12+log(O/H) < 8.8), ionization (0.5 < O_32 < 38.0), reddening (0.02 < E(B-V < 0.67), and nebular density (10 < n_e (cm^-3) < 1120). CLASSY is biased to UV-bright star-forming galaxies, resulting in a sample that is consistent with z~0 mass-metallicity relationship, but is offset to higher SFRs by roughly 2 dex, similar to z >~2 galaxies. This unique set of properties makes the CLASSY atlas the benchmark training set for star-forming galaxies across cosmic time.

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