Uniformity of foreground Galactic neutral hydrogen over cooling flow clusters

D. G. Barnes; P. E J Nulsen

doi:10.1046/j.1365-8711.2003.06676.x

Uniformity of foreground Galactic neutral hydrogen over cooling flow clusters

D. G. Barnes
, P. E J Nulsen

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

7 Citations (Scopus)

Abstract

Radio maps at 21 cm of foreground neutral hydrogen over three cooling flow clusters of galaxies show that the foreground gas is uniform on scales from ∼1-10 arcmin. Five sigma limits on fluctuations in the foreground column density for Abell 3581, Sersic 159-03 and Abell 2597 are 6.2 × 10 ¹⁹, 7.8 × 10¹⁹ and 4.3 × 10¹⁹ cm^-2, or 14, 43 and 17 per cent of the mean foreground column density in the region of the system, respectively. Fluctuations in the column density of neutral gas in the Galaxy are unlikely to account for any excesses of photoelectric absorption in these or other cooling flow clusters. Fluctuations in the foreground neutral gas on arcmin scales are also unlikely to be the cause of excess extreme ultraviolet and soft X-ray emission from clusters.

Original language	English
Pages (from-to)	315-321
Number of pages	7
Journal	Monthly Notices of the Royal Astronomical Society
Volume	343
Issue number	1
DOIs	https://doi.org/10.1046/j.1365-8711.2003.06676.x
Publication status	Published - 21 Jul 2003
Externally published	Yes

Keywords

Cooling flows
Galaxies: clusters: individual: A2597
Galaxies: clusters: individual: A3581
Galaxies: clusters: individual: Sersic 159-03
ISM: structure
X-rays: galaxies: clusters

Access to Document

10.1046/j.1365-8711.2003.06676.x

Cite this

@article{94decd08eb544e6b977bfeb1ca035dd5,

title = "Uniformity of foreground Galactic neutral hydrogen over cooling flow clusters",

abstract = "Radio maps at 21 cm of foreground neutral hydrogen over three cooling flow clusters of galaxies show that the foreground gas is uniform on scales from ∼1-10 arcmin. Five sigma limits on fluctuations in the foreground column density for Abell 3581, Sersic 159-03 and Abell 2597 are 6.2 × 10 19, 7.8 × 1019 and 4.3 × 1019 cm-2, or 14, 43 and 17 per cent of the mean foreground column density in the region of the system, respectively. Fluctuations in the column density of neutral gas in the Galaxy are unlikely to account for any excesses of photoelectric absorption in these or other cooling flow clusters. Fluctuations in the foreground neutral gas on arcmin scales are also unlikely to be the cause of excess extreme ultraviolet and soft X-ray emission from clusters.",

keywords = "Cooling flows, Galaxies: clusters: individual: A2597, Galaxies: clusters: individual: A3581, Galaxies: clusters: individual: Sersic 159-03, ISM: structure, X-rays: galaxies: clusters",

author = "Barnes, \{D. G.\} and Nulsen, \{P. E J\}",

year = "2003",

month = jul,

day = "21",

doi = "10.1046/j.1365-8711.2003.06676.x",

language = "English",

volume = "343",

pages = "315--321",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "1",

}

TY - JOUR

T1 - Uniformity of foreground Galactic neutral hydrogen over cooling flow clusters

AU - Barnes, D. G.

AU - Nulsen, P. E J

PY - 2003/7/21

Y1 - 2003/7/21

N2 - Radio maps at 21 cm of foreground neutral hydrogen over three cooling flow clusters of galaxies show that the foreground gas is uniform on scales from ∼1-10 arcmin. Five sigma limits on fluctuations in the foreground column density for Abell 3581, Sersic 159-03 and Abell 2597 are 6.2 × 10 19, 7.8 × 1019 and 4.3 × 1019 cm-2, or 14, 43 and 17 per cent of the mean foreground column density in the region of the system, respectively. Fluctuations in the column density of neutral gas in the Galaxy are unlikely to account for any excesses of photoelectric absorption in these or other cooling flow clusters. Fluctuations in the foreground neutral gas on arcmin scales are also unlikely to be the cause of excess extreme ultraviolet and soft X-ray emission from clusters.

AB - Radio maps at 21 cm of foreground neutral hydrogen over three cooling flow clusters of galaxies show that the foreground gas is uniform on scales from ∼1-10 arcmin. Five sigma limits on fluctuations in the foreground column density for Abell 3581, Sersic 159-03 and Abell 2597 are 6.2 × 10 19, 7.8 × 1019 and 4.3 × 1019 cm-2, or 14, 43 and 17 per cent of the mean foreground column density in the region of the system, respectively. Fluctuations in the column density of neutral gas in the Galaxy are unlikely to account for any excesses of photoelectric absorption in these or other cooling flow clusters. Fluctuations in the foreground neutral gas on arcmin scales are also unlikely to be the cause of excess extreme ultraviolet and soft X-ray emission from clusters.

KW - Cooling flows

KW - Galaxies: clusters: individual: A2597

KW - Galaxies: clusters: individual: A3581

KW - Galaxies: clusters: individual: Sersic 159-03

KW - ISM: structure

KW - X-rays: galaxies: clusters

UR - https://www.scopus.com/pages/publications/0142054935

U2 - 10.1046/j.1365-8711.2003.06676.x

DO - 10.1046/j.1365-8711.2003.06676.x

M3 - Article

AN - SCOPUS:0142054935

SN - 0035-8711

VL - 343

SP - 315

EP - 321

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 1

ER -

Uniformity of foreground Galactic neutral hydrogen over cooling flow clusters

Abstract

Keywords

Access to Document

Other files and links

Cite this