GALAXY GROUPS: A 2MASS CATALOG
ABSTRACT A galaxy group catalog is built from the sample of the 2MASS Redshift Survey almost complete to Ks = 11.75 over 91% of the sky. Constraints in the construction of the groups were provided by scaling relations determined by close examination of well defined groups with masses between 1011 an...
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| description | ABSTRACT A galaxy group catalog is built from the sample of the 2MASS Redshift Survey almost complete to Ks = 11.75 over 91% of the sky. Constraints in the construction of the groups were provided by scaling relations determined by close examination of well defined groups with masses between 1011 and . Group masses inferred from Ks luminosities are statistically in agreement with masses calculated from application of the virial theorem. While groups have been identified over the full redshift range of the sample, the properties of the nearest and farthest groups are uncertain and subsequent analysis has only considered groups with velocities between 3000 and 10,000 km s−1. The 24,044 galaxies in this range are identified with 13,607 entities, 3461 of them with two or more members. A group mass function is constructed. The Sheth-Tormen formalism provides a good fit to the shape of the mass function for group masses above but the count normalization is poor. Summing all the mass associated with the galaxy groups between 3000 and 10,000 km s−1 gives a density of collapsed matter as a fraction of the critical density of . |
| doi_str_mv | 10.1088/0004-6256/149/5/171 |
| format | Article |
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The Sheth-Tormen formalism provides a good fit to the shape of the mass function for group masses above but the count normalization is poor. 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A group mass function is constructed. The Sheth-Tormen formalism provides a good fit to the shape of the mass function for group masses above but the count normalization is poor. Summing all the mass associated with the galaxy groups between 3000 and 10,000 km s−1 gives a density of collapsed matter as a fraction of the critical density of .</description><subject>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</subject><subject>Construction</subject><subject>dark matter</subject><subject>Density</subject><subject>GALAXIES</subject><subject>galaxies: clusters: general</subject><subject>galaxies: luminosity function, mass function</subject><subject>GALAXY CLUSTERS</subject><subject>large-scale structure of universe</subject><subject>LIMITING VALUES</subject><subject>LUMINOSITY</subject><subject>MASS</subject><subject>NONLUMINOUS MATTER</subject><subject>RED SHIFT</subject><subject>Samples</subject><subject>SHAPE</subject><subject>Statistical analysis</subject><subject>Statistical methods</subject><subject>UNIVERSE</subject><issn>0004-6256</issn><issn>1538-3881</issn><issn>1538-3881</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><recordid>eNqNkEFLwzAUgIMoOKe_QJCCFy-1eUmTvnorQ6cwmbgN9BTSNMWOrZlNd_Dfm1HxKJ4evPd97_ARcgn0FihiQilNY8mETCDNE5FABkdkBIJjzBHhmIx-iVNy5v2aUgCk6YhcTYtZ8fYeTV_nq5fFXVRE7LlYLKJJsSxm8-k5Oan1xtuLnzkmq4f75eQxDrenSTGLDUfex4BlVUoma5NBXmayRltbLE3GS10xDZwLlmMlwzrLZaUFItaaIWOGV2BTPibXw1_n-0Z50_TWfBjXttb0ijGUDDMWqJuB2nXuc299r7aNN3az0a11e68gyzmTqRTpP1CJAmmOMqB8QE3nvO9srXZds9XdlwKqDnnVIZ46xFMhrxJBhmAlg9W4nVq7fdeGPn8a3yd2dSs</recordid><startdate>20150501</startdate><enddate>20150501</enddate><creator>Tully, R. Brent</creator><general>The American Astronomical Society</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>KL.</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>OTOTI</scope><orcidid>https://orcid.org/0000-0002-9291-1981</orcidid></search><sort><creationdate>20150501</creationdate><title>GALAXY GROUPS: A 2MASS CATALOG</title><author>Tully, R. 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Brent</creatorcontrib><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>OSTI.GOV</collection><jtitle>The Astronomical journal</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Tully, R. Brent</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>GALAXY GROUPS: A 2MASS CATALOG</atitle><jtitle>The Astronomical journal</jtitle><stitle>AJ</stitle><addtitle>Astron. J</addtitle><date>2015-05-01</date><risdate>2015</risdate><volume>149</volume><issue>5</issue><spage>1</spage><epage>14</epage><pages>1-14</pages><issn>0004-6256</issn><issn>1538-3881</issn><eissn>1538-3881</eissn><abstract>ABSTRACT A galaxy group catalog is built from the sample of the 2MASS Redshift Survey almost complete to Ks = 11.75 over 91% of the sky. Constraints in the construction of the groups were provided by scaling relations determined by close examination of well defined groups with masses between 1011 and . Group masses inferred from Ks luminosities are statistically in agreement with masses calculated from application of the virial theorem. While groups have been identified over the full redshift range of the sample, the properties of the nearest and farthest groups are uncertain and subsequent analysis has only considered groups with velocities between 3000 and 10,000 km s−1. The 24,044 galaxies in this range are identified with 13,607 entities, 3461 of them with two or more members. A group mass function is constructed. The Sheth-Tormen formalism provides a good fit to the shape of the mass function for group masses above but the count normalization is poor. Summing all the mass associated with the galaxy groups between 3000 and 10,000 km s−1 gives a density of collapsed matter as a fraction of the critical density of .</abstract><cop>United States</cop><pub>The American Astronomical Society</pub><doi>10.1088/0004-6256/149/5/171</doi><tpages>14</tpages><orcidid>https://orcid.org/0000-0002-9291-1981</orcidid></addata></record> |
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| ispartof | The Astronomical journal, 2015-05, Vol.149 (5), p.1-14 |
| issn | 0004-6256 1538-3881 1538-3881 |
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| source | Open Access: IOP Publishing Free Content |
| subjects | ASTROPHYSICS, COSMOLOGY AND ASTRONOMY Construction dark matter Density GALAXIES galaxies: clusters: general galaxies: luminosity function, mass function GALAXY CLUSTERS large-scale structure of universe LIMITING VALUES LUMINOSITY MASS NONLUMINOUS MATTER RED SHIFT Samples SHAPE Statistical analysis Statistical methods UNIVERSE |
| title | GALAXY GROUPS: A 2MASS CATALOG |
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