Keck observations of ROSAT ultra-luminous X-ray source candidates

Diane Sonya Wong; Ryan Chornock; Alexei V. Filippenko

doi:10.1016/j.asr.2006.01.024

Keck observations of ROSAT ultra-luminous X-ray source candidates

Diane Sonya Wong^*, Ryan Chornock, Alexei V. Filippenko

^*Corresponding author for this work

Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

We present results of optical follow-up observations of candidate ultra-luminous X-ray sources (ULXs). Using Keck optical spectroscopy, 17 of the candidates from the Colbert and Ptak [Colbert, E.J.M., Ptak, A.F. A catalog of candidate intermediate-luminosity X-ray objects. ApJS 143, 25-45, 2002] catalog have been identified; this is one of the largest sets of optical identifications of such objects thus far. Fifteen are background active galactic nuclei (AGN); two are foreground stars in our Galaxy. These findings are consistent with background and foreground object expectations, as derived from log N-log S relations. Also, the results are briefly discussed in terms of the spiral-galaxy/ULX connection.

Original language	English (US)
Pages (from-to)	2813-2815
Number of pages	3
Journal	Advances in Space Research
Volume	38
Issue number	12
DOIs	https://doi.org/10.1016/j.asr.2006.01.024
State	Published - 2006

Keywords

Black hole physics
Catalogs
Galaxies
Quasars
X-rays
distances and redshifts
galaxies
general
individual (NGC 720, NGC 1316, NGC 1365, NGC 1399, NGC 2775, NGC 3226, IC 2597, NGC 3923, NGC 4151, NGC 4373, NGC 5128)

ASJC Scopus subject areas

Aerospace Engineering
Astronomy and Astrophysics
Geophysics
Atmospheric Science
Space and Planetary Science
General Earth and Planetary Sciences

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10.1016/j.asr.2006.01.024

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title = "Keck observations of ROSAT ultra-luminous X-ray source candidates",

abstract = "We present results of optical follow-up observations of candidate ultra-luminous X-ray sources (ULXs). Using Keck optical spectroscopy, 17 of the candidates from the Colbert and Ptak [Colbert, E.J.M., Ptak, A.F. A catalog of candidate intermediate-luminosity X-ray objects. ApJS 143, 25-45, 2002] catalog have been identified; this is one of the largest sets of optical identifications of such objects thus far. Fifteen are background active galactic nuclei (AGN); two are foreground stars in our Galaxy. These findings are consistent with background and foreground object expectations, as derived from log N-log S relations. Also, the results are briefly discussed in terms of the spiral-galaxy/ULX connection.",

keywords = "Black hole physics, Catalogs, Galaxies, Quasars, X-rays, distances and redshifts, galaxies, general, individual (NGC 720, NGC 1316, NGC 1365, NGC 1399, NGC 2775, NGC 3226, IC 2597, NGC 3923, NGC 4151, NGC 4373, NGC 5128)",

author = "Wong, {Diane Sonya} and Ryan Chornock and Filippenko, {Alexei V.}",

year = "2006",

doi = "10.1016/j.asr.2006.01.024",

language = "English (US)",

volume = "38",

pages = "2813--2815",

journal = "Advances in Space Research",

issn = "0273-1177",

publisher = "Elsevier Limited",

number = "12",

}

TY - JOUR

T1 - Keck observations of ROSAT ultra-luminous X-ray source candidates

AU - Wong, Diane Sonya

AU - Chornock, Ryan

AU - Filippenko, Alexei V.

PY - 2006

Y1 - 2006

N2 - We present results of optical follow-up observations of candidate ultra-luminous X-ray sources (ULXs). Using Keck optical spectroscopy, 17 of the candidates from the Colbert and Ptak [Colbert, E.J.M., Ptak, A.F. A catalog of candidate intermediate-luminosity X-ray objects. ApJS 143, 25-45, 2002] catalog have been identified; this is one of the largest sets of optical identifications of such objects thus far. Fifteen are background active galactic nuclei (AGN); two are foreground stars in our Galaxy. These findings are consistent with background and foreground object expectations, as derived from log N-log S relations. Also, the results are briefly discussed in terms of the spiral-galaxy/ULX connection.

AB - We present results of optical follow-up observations of candidate ultra-luminous X-ray sources (ULXs). Using Keck optical spectroscopy, 17 of the candidates from the Colbert and Ptak [Colbert, E.J.M., Ptak, A.F. A catalog of candidate intermediate-luminosity X-ray objects. ApJS 143, 25-45, 2002] catalog have been identified; this is one of the largest sets of optical identifications of such objects thus far. Fifteen are background active galactic nuclei (AGN); two are foreground stars in our Galaxy. These findings are consistent with background and foreground object expectations, as derived from log N-log S relations. Also, the results are briefly discussed in terms of the spiral-galaxy/ULX connection.

KW - Black hole physics

KW - Catalogs

KW - Galaxies

KW - Quasars

KW - X-rays

KW - distances and redshifts

KW - galaxies

KW - general

KW - individual (NGC 720, NGC 1316, NGC 1365, NGC 1399, NGC 2775, NGC 3226, IC 2597, NGC 3923, NGC 4151, NGC 4373, NGC 5128)

UR - http://www.scopus.com/inward/record.url?scp=33751171255&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33751171255&partnerID=8YFLogxK

U2 - 10.1016/j.asr.2006.01.024

DO - 10.1016/j.asr.2006.01.024

M3 - Article

AN - SCOPUS:33751171255

SN - 0273-1177

VL - 38

SP - 2813

EP - 2815

JO - Advances in Space Research

JF - Advances in Space Research

IS - 12

ER -

Keck observations of ROSAT ultra-luminous X-ray source candidates

Abstract

Keywords

ASJC Scopus subject areas

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