SDSS J121811.0+465501.2: A new low surface brightness galaxy with low metallicity
文献类型：期刊论文
| 作者 | Liang, Y. C.; Hu, J. Y.; Liu, F. S.; Liu, Z. T. |
| 刊名 | ASTRONOMICAL JOURNAL
 |
| 出版日期 | 2007-08-01 |
| 卷号 | 134期号:2页码:759-765 |
| 关键词 | galaxies : abundances galaxies : dwarf galaxies : evolution galaxies : irregular galaxies : ISM galaxies : spiral |
| 英文摘要 | We have serendipitously found a new nearby low surface brightness (LSB) galaxy from the SDSS database. We estimate the oxygen abundance of its H II region SDSS J1218 11.0+465501.2 from its electron temperature, as well as that of another H It region, SDSS J135440.5+535309.6, located in the irregular LSB galaxy UGC 8837. These two extragalactic H it regions were classified as stars in the SDSS DR4 database and were found occasionally by us in the automatic recognition and classification of stellar spectra. Their optical spectra show obvious emission lines, i.e., strong [O III] lambda lambda 4959, 5007 and Balmer emission lines, but very weak [N II] lambda lambda 6548, 6583 and [S II] lambda lambda:6317, 6731, which could indicate that they are metal-poor star-forming regions. The derived oxygen abundances of the two objects are 12 + log (O/H) similar to 7.88 +/- 0.30 and 7.70 +/- 0.30, respectively. The host of the H it region SDSS J121811.0+ 465501.2 is identified as a new nearly edge-on LSB disk galaxy (almost without a bulge), with a B-band central surface brightness mu(0)(B) of 23.68 mag arcsec(-2) and an inclination angle of similar to 75 degrees by using the GIM2D software to analyze its g- and r-band images independently. It is a nearby dwarf galaxy with redshift z similar to 0.00157, disk scale length similar to 0.40 kpc, and B-band absolute magnitude MB similar to -13.51 mag. The very low oxygen abundances of these two objects confirm the low metallicities of LSB galaxies. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000248591800027 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7168]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Beijing Jiaotong Univ, Sch Elect & Informat Engn, Beijing 100044, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liang, Y. C.,Hu, J. Y.,Liu, F. S.,et al. SDSS J121811.0+465501.2: A new low surface brightness galaxy with low metallicity[J]. ASTRONOMICAL JOURNAL,2007,134(2):759-765. |
| APA | Liang, Y. C.,Hu, J. Y.,Liu, F. S.,&Liu, Z. T..(2007).SDSS J121811.0+465501.2: A new low surface brightness galaxy with low metallicity.ASTRONOMICAL JOURNAL,134(2),759-765. |
| MLA | Liang, Y. C.,et al."SDSS J121811.0+465501.2: A new low surface brightness galaxy with low metallicity".ASTRONOMICAL JOURNAL 134.2(2007):759-765. |
入库方式： OAI收割
来源：国家天文台
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