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J/ApJ/790/76          Galaxies near NGC 891 properties            (Schulz, 2014)

Dwarf galaxies in the halo of NGC 891. Schulz E. <Astrophys. J., 790, 76 (2014)> =2014ApJ...790...76S (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; Photometry, ultraviolet ; Photometry, infrared Keywords: galaxies: clusters: individual: NGC 891 - galaxies: dwarf - galaxies: groups: individual: A347 - surveys Abstract: We report the results of a survey of the region within 40 arcmin of NGC 891, a nearby nearly perfectly edge-on spiral galaxy. Candidate "non-stars" with diameters greater than 15 arcsec were selected from the GSC 2.3.2 catalog and cross-comparison of observations in several bands using archived GALEX, DSS2, WISE, and Two Micron All Sky Survey images identified contaminating stars, artifacts, and background galaxies, all of which were excluded. The resulting 71 galaxies, many of which were previously uncataloged, comprise a size-limited survey of the region. A majority of the galaxies are in the background of NGC 891 and are for the most part members of the A347 cluster at a distance of about 75 Mpc. The new finds approximately double the known membership of A347, previously thought to be relatively sparse. We identify a total of seven dwarf galaxies, most of which are new discoveries. The newly discovered dwarf galaxies are dim and gas-poor and may be associated with the previously observed arcs of red giant branch halo stars in the halo and the prominent H I filament and the lopsided features in the disk of NGC 891. Several of the dwarfs show signs of disruption, consistent with being remnants of an ancient collision. Description: A methodical search for visible galaxies in the vicinity of NGC 891 was undertaken by examining candidates taken from The Guide Star Catalog II (GSC 2.3.2; Lasker et al. 2008AJ....136..735L). The GSC 2.3.2 is a deep all-sky catalog derived from the Digitized Sky Surveys, which in turn were created from Palomar and UK Schmidt survey plates, and is based on at least two epochs and three passbands. The candidates were 173 "nonstars" from the GSC 2.3.2 catalog lying within 40' of NGC 891 (113 kpc at the distance of NGC 891) for which the major axis was greater than 15''. The search region was limited in order to keep the number of candidates to a reasonable total and because GALEX observations covered this region. Objects: ---------------------------------------------------------- RA (ICRS) DE Designation(s) ---------------------------------------------------------- 02 22 32.91 +42 20 53.9 NGC 891 = TC 454 02 25 50 +41 52.5 A347 = FR 19 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 95 71 Galaxies near NGC 891 table2.dat 71 71 GALEX and WISE Magnitudes
See also: VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006) I/305 : The Guide Star Catalog, Version 2.3.2 (GSC2.3) (STScI, 2006) II/312 : GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011) II/311 : WISE All-Sky Data Release (Cutri+ 2012) J/ApJ/619/193 : Catalog of nearby cluster galaxy photometry (McIntosh+, 2005) J/A+A/542/A39 : NIR photometry in 10 nearby spiral galaxies (Grosboel+, 2012) J/ApJS/199/36 : Hα survey of nearby clusters of galaxies (Sakai+, 2012) J/A+A/575/A17 : NGC 891 Herschel PACS and SPIRE spectroscopy (Hughes+, 2015) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 2 I2 --- ID Identifier number 4- 13 A10 --- GSC2.3 GSC 2.3.2 ID (Cat. I/305) 14 A1 --- n_GSC2.3 [c] Note on GSC2.3 (1) 16- 17 I2 h RAh Hour of Right Ascension (J2000) 19- 20 I2 min RAm Minute of Right Ascension (J2000) 22- 23 I2 s RAs Second of Right Ascension (J2000) 25 A1 --- DE- Sign of the Declination (J2000) 26- 27 I2 deg DEd Degree of Declination (J2000) 29- 30 I2 arcmin DEm Minute of Declination (J2000) 32- 33 I2 arcsec DEs Second of Declination (J2000) 35- 39 F5.2 arcmin Dist Distance from NGC 891 41- 52 A12 --- AID Most commonly used alternate ID 54- 55 I2 --- SID ? ID number if listed in the Sakai et al. catalog (2012, J/ApJS/199/36) [SKM2012] N891 NN in Simbad 57 A1 --- 2MX [Y] Indicates if the galaxy is listed in the 2MASX catalog (Jarrett et al. 2000AJ....119.2498J, Cat. VII/233) 59- 63 I5 km/s RV ? Radial velocity 65- 69 F5.2 mag RFmag ?=- Apparent RF magnitude (2) 71- 75 F5.2 mag BJmag ?=- Apparent BJ magnitude (2) 77- 81 F5.2 mag INmag ?=- Apparent IN magnitude (2) 82 A1 --- n_INmag [b] Note on INmag (3) 84- 87 F4.1 arcsec Rad Semi-major axis (2) 89- 92 F4.1 mag/arcsec2 NIRmu Calculated NIR surface brightness 93 A1 --- n_NIRmu [b] Note on NIRmu (3) 95 A1 --- Fore [F-] F indicates that this is a foreground dwarf
Note (1): No. 63 was incorrectly cataloged as a star (type = 0) in GSC2.3. Note (2): This data from the GSC 2.3.2 catalog (Cat. I/305) is affected by relatively large systematic errors. Note (3): Estimated value.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 2 I2 --- ID Identifier number 4- 13 A10 --- GSC2.3 GSC 2.3.2 ID (Cat. I/305) 15- 18 F4.1 mag FUVmag ?=- GALEX FUV apparent magnitude 20- 23 F4.1 mag NUVmag GALEX NUV apparent magnitude 25- 28 F4.1 mag W1mag WISE W1 apparent magnitude 30- 33 F4.1 mag W2mag WISE W2 apparent magnitude 35- 38 F4.1 mag W3mag ?=- WISE W3 apparent magnitude 40- 43 F4.1 mag W4mag ?=- WISE W4 apparent magnitude 45- 49 F5.1 mag W1Maga WISE W1 absolute magnitude for case a (1) 51- 55 F5.1 mag W1Magb ? WISE W1 absolute magnitude for case b (2) 57- 63 E7.2 Lsun W1La WISE W1 luminosity for case a (1) 65- 71 E7.2 Lsun W1Lb ? WISE W1 luminosity for case b (2)
Note (1): Assuming a distance of 9.8 Mpc for foreground galaxies indicated on Table 1 and 75 Mpc for the remaining galaxies. Note (2): Assuming a distance of 75 Mpc for foreground galaxies for comparison.
History: From electronic version of the journal
(End) Prepared by Tiphaine Pouvreau [CDS] 20-Mar-2017
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